[PATCH 0/2] Add support for the DW IP Prototyping Kits for MIPI CSI-2 Host

[PATCH 0/2] Add support for the DW IP Prototyping Kits for MIPI CSI-2 Host

[Ramiro Oliveira]

This patchset adds basic support for the DW CSI-2 Host IPK. There are 
some parts of the kit that aren't currently supported by this media 
platform driver but will be in the future.

Ramiro Oliveira (2):
  Add Documentation for Media Device, Video Device, and Synopsys DW MIPI
    CSI-2 Host
  Add basic support for DW CSI-2 Host IPK

 .../devicetree/bindings/media/snps,dw-mipi-csi.txt |  27 +
 .../devicetree/bindings/media/snps,plat-ipk.txt    |   9 +
 .../bindings/media/snps,video-device.txt           |  12 +
 MAINTAINERS                                        |   7 +
 drivers/media/platform/Kconfig                     |   1 +
 drivers/media/platform/Makefile                    |   2 +
 drivers/media/platform/dwc/Kconfig                 |  36 +
 drivers/media/platform/dwc/Makefile                |   3 +
 drivers/media/platform/dwc/dw_mipi_csi.c           | 687 +++++++++++++++++
 drivers/media/platform/dwc/dw_mipi_csi.h           | 179 +++++
 drivers/media/platform/dwc/plat_ipk.c              | 835 +++++++++++++++++++++
 drivers/media/platform/dwc/plat_ipk.h              |  97 +++
 drivers/media/platform/dwc/plat_ipk_video.h        |  97 +++
 drivers/media/platform/dwc/video_device.c          | 741 ++++++++++++++++++
 drivers/media/platform/dwc/video_device.h          | 101 +++
 15 files changed, 2834 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/snps,dw-mipi-csi.txt
 create mode 100644 Documentation/devicetree/bindings/media/snps,plat-ipk.txt
 create mode 100644 Documentation/devicetree/bindings/media/snps,video-device.txt
 create mode 100644 drivers/media/platform/dwc/Kconfig
 create mode 100644 drivers/media/platform/dwc/Makefile
 create mode 100644 drivers/media/platform/dwc/dw_mipi_csi.c
 create mode 100644 drivers/media/platform/dwc/dw_mipi_csi.h
 create mode 100644 drivers/media/platform/dwc/plat_ipk.c
 create mode 100644 drivers/media/platform/dwc/plat_ipk.h
 create mode 100644 drivers/media/platform/dwc/plat_ipk_video.h
 create mode 100644 drivers/media/platform/dwc/video_device.c
 create mode 100644 drivers/media/platform/dwc/video_device.h

-- 
2.10.2


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[PATCH 1/2] Add Documentation for Media Device, Video Device, and Synopsys DW MIPI CSI-2 Host

[Ramiro Oliveira]

Add documentation for Media and Video Device, as well as the DW MIPI CSI-2 
Host.

Signed-off-by: Ramiro Oliveira <roliveir@synopsys.com>
---
 .../devicetree/bindings/media/snps,dw-mipi-csi.txt | 27 ++++++++++++++++++++++
 .../devicetree/bindings/media/snps,plat-ipk.txt    |  9 ++++++++
 .../bindings/media/snps,video-device.txt           | 12 ++++++++++
 3 files changed, 48 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/snps,dw-mipi-csi.txt
 create mode 100644 Documentation/devicetree/bindings/media/snps,plat-ipk.txt
 create mode 100644 Documentation/devicetree/bindings/media/snps,video-device.txt

diff --git a/Documentation/devicetree/bindings/media/snps,dw-mipi-csi.txt b/Documentation/devicetree/bindings/media/snps,dw-mipi-csi.txt
new file mode 100644
index 0000000..bec7441
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/snps,dw-mipi-csi.txt
@@ -0,0 +1,27 @@
+Synopsys DesignWare CSI-2 Host controller
+
+Description
+-----------
+
+This HW block is used to receive image coming from an MIPI CSI-2 compatible
+camera.
+
+Required properties:
+- compatible: shall be "snps,dw-mipi-csi"
+- reg		: physical base address and size of the device memory mapped
+		  registers;
+- interrupts	: CSI-2 Host interrupt
+- data-lanes    : Number of lanes to be used
+- output-type   : Core output to be used (IPI-> 0 or IDI->1 or BOTH->2)
+- phys, phy-names: List of one PHY specifier and identifier string (as defined
+  in Documentation/devicetree/bindings/phy/phy-bindings.txt).
+
+Optional properties(if in IPI mode):
+- ipi-mode 	: Mode to be used when in IPI(Camera -> 0 or Automatic -> 1)
+- ipi-color-mode: Color depth to be used in IPI (48 bits -> 0 or 16 bits -> 1)
+- ipi-auto-flush: Data auto-flush (1 -> Yes or 0 -> No)
+- virtual-channel: Virtual channel where data is present when in IPI
+
+The per-board settings:
+ - port sub-node describing a single endpoint connected to the dw-mipi-csi
+   as described in video-interfaces.txt[1].
diff --git a/Documentation/devicetree/bindings/media/snps,plat-ipk.txt b/Documentation/devicetree/bindings/media/snps,plat-ipk.txt
new file mode 100644
index 0000000..2d51541
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/snps,plat-ipk.txt
@@ -0,0 +1,9 @@
+Synopsys DesignWare CSI-2 Host IPK Media Device
+
+This Media Device at the moment is not totally functional, however it is a base
+for the future.
+
+Required properties:
+
+- compatible: Must be "snps,plat-ipk".
+
diff --git a/Documentation/devicetree/bindings/media/snps,video-device.txt b/Documentation/devicetree/bindings/media/snps,video-device.txt
new file mode 100644
index 0000000..d467092
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/snps,video-device.txt
@@ -0,0 +1,12 @@
+Synopsys DesignWare CSI-2 Host video device
+
+This driver handles all the video handling part of this platform.
+
+Required properties:
+
+- compatible: Must be "snps,video-device".
+
+- dmas, dma-names: List of one DMA specifier and identifier string (as defined
+  in Documentation/devicetree/bindings/dma/dma.txt) per port. Each port
+  requires a DMA channel with the identifier string set to "port" followed by
+  the port index.
-- 
2.10.2

Re: [PATCH 1/2] Add Documentation for Media Device, Video Device, and Synopsys DW MIPI CSI-2 Host

[Laurent Pinchart]

Hi Ramiro,

Thank you for the patch.

On Monday 14 Nov 2016 14:20:22 Ramiro Oliveira wrote:
> Add documentation for Media and Video Device, as well as the DW MIPI CSI-2
> Host.
> 
> Signed-off-by: Ramiro Oliveira <roliveir@synopsys.com>
> ---
>  .../devicetree/bindings/media/snps,dw-mipi-csi.txt | 27 +++++++++++++++++++
>  .../devicetree/bindings/media/snps,plat-ipk.txt    |  9 ++++++++
>  .../bindings/media/snps,video-device.txt           | 12 ++++++++++
>  3 files changed, 48 insertions(+)
>  create mode 100644
> Documentation/devicetree/bindings/media/snps,dw-mipi-csi.txt create mode
> 100644 Documentation/devicetree/bindings/media/snps,plat-ipk.txt create
> mode 100644 Documentation/devicetree/bindings/media/snps,video-device.txt
> 
> diff --git a/Documentation/devicetree/bindings/media/snps,dw-mipi-csi.txt
> b/Documentation/devicetree/bindings/media/snps,dw-mipi-csi.txt new file
> mode 100644
> index 0000000..bec7441
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/snps,dw-mipi-csi.txt
> @@ -0,0 +1,27 @@
> +Synopsys DesignWare CSI-2 Host controller
> +
> +Description
> +-----------
> +
> +This HW block is used to receive image coming from an MIPI CSI-2 compatible
> +camera.

And what does it do after receiving the stream ? A more detailed description 
would be useful. Is there any public documentation for this IP core ?

> +Required properties:
> +- compatible: shall be "snps,dw-mipi-csi"
> +- reg		: physical base address and size of the device memory 
mapped
> +		  registers;
> +- interrupts	: CSI-2 Host interrupt
> +- data-lanes    : Number of lanes to be used

Is that fixed at synthesis time or configurable at runtime ?

> +- output-type   : Core output to be used (IPI-> 0 or IDI->1 or BOTH->2)

What are IPI and IDI ?

> +- phys, phy-names: List of one PHY specifier and identifier string (as
> defined
> +  in Documentation/devicetree/bindings/phy/phy-bindings.txt).

A PHY for what ?

> +Optional properties(if in IPI mode):
> +- ipi-mode 	: Mode to be used when in IPI(Camera -> 0 or Automatic -> 1)
> +- ipi-color-mode: Color depth to be used in IPI (48 bits -> 0 or 16 bits ->
> 1)
> +- ipi-auto-flush: Data auto-flush (1 -> Yes or 0 -> No)
> +- virtual-channel: Virtual channel where data is present when in IPI

We need more details than that, this is impossible to review, sorry.

> +The per-board settings:
> + - port sub-node describing a single endpoint connected to the dw-mipi-csi
> +   as described in video-interfaces.txt[1].

An example would be nice.

> diff --git a/Documentation/devicetree/bindings/media/snps,plat-ipk.txt
> b/Documentation/devicetree/bindings/media/snps,plat-ipk.txt new file mode
> 100644
> index 0000000..2d51541
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/snps,plat-ipk.txt
> @@ -0,0 +1,9 @@
> +Synopsys DesignWare CSI-2 Host IPK Media Device
> +
> +This Media Device at the moment is not totally functional, however it is a
> base
> +for the future.

Then let's add it later :-) We don't want to design incomplete transient DT 
bindings.

> +Required properties:
> +
> +- compatible: Must be "snps,plat-ipk".
> +
> diff --git a/Documentation/devicetree/bindings/media/snps,video-device.txt
> b/Documentation/devicetree/bindings/media/snps,video-device.txt new file
> mode 100644
> index 0000000..d467092
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/snps,video-device.txt
> @@ -0,0 +1,12 @@
> +Synopsys DesignWare CSI-2 Host video device
> +
> +This driver handles all the video handling part of this platform.

This is a DT binding documentation, drivers are irrelevant. You should 
describe the hardware only.

More information is needed, based on this document I can't tell what the 
"CSI-2 host video device" is.

> +Required properties:
> +
> +- compatible: Must be "snps,video-device".
> +
> +- dmas, dma-names: List of one DMA specifier and identifier string (as
> defined
> +  in Documentation/devicetree/bindings/dma/dma.txt) per port. Each port
> +  requires a DMA channel with the identifier string set to "port" followed
> by
> +  the port index.

-- 
Regards,

Laurent Pinchart

Re: [PATCH 1/2] Add Documentation for Media Device, Video Device, and Synopsys DW MIPI CSI-2 Host

[Ramiro Oliveira]

Hi Laurent,

Thanks for the feedback.

On 11/14/2016 2:49 PM, Laurent Pinchart wrote:
> Hi Ramiro,
> 
> Thank you for the patch.
> 
> On Monday 14 Nov 2016 14:20:22 Ramiro Oliveira wrote:
>> Add documentation for Media and Video Device, as well as the DW MIPI CSI-2
>> Host.
>>
>> Signed-off-by: Ramiro Oliveira <roliveir@synopsys.com>
>> ---
>>  .../devicetree/bindings/media/snps,dw-mipi-csi.txt | 27 +++++++++++++++++++
>>  .../devicetree/bindings/media/snps,plat-ipk.txt    |  9 ++++++++
>>  .../bindings/media/snps,video-device.txt           | 12 ++++++++++
>>  3 files changed, 48 insertions(+)
>>  create mode 100644
>> Documentation/devicetree/bindings/media/snps,dw-mipi-csi.txt create mode
>> 100644 Documentation/devicetree/bindings/media/snps,plat-ipk.txt create
>> mode 100644 Documentation/devicetree/bindings/media/snps,video-device.txt
>>
>> diff --git a/Documentation/devicetree/bindings/media/snps,dw-mipi-csi.txt
>> b/Documentation/devicetree/bindings/media/snps,dw-mipi-csi.txt new file
>> mode 100644
>> index 0000000..bec7441
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/media/snps,dw-mipi-csi.txt
>> @@ -0,0 +1,27 @@
>> +Synopsys DesignWare CSI-2 Host controller
>> +
>> +Description
>> +-----------
>> +
>> +This HW block is used to receive image coming from an MIPI CSI-2 compatible
>> +camera.
> 
> And what does it do after receiving the stream ? A more detailed description 
> would be useful. Is there any public documentation for this IP core ?
> 

I can add a more detailed description. Also, here is a link to the
documentation, but I'm afraid you might have to register yourself to access it.

CSI-2 Host
https://www.synopsys.com/dw/doc.php/ds/c/dwc_csi2_controller.pdf

CSI-2 Host IPK
https://www.synopsys.com/dw/doc.php/ds/o/ip_prototyping_kit_mipi_csi2_host_arc.pdf

>> +Required properties:
>> +- compatible: shall be "snps,dw-mipi-csi"
>> +- reg		: physical base address and size of the device memory 
> mapped
>> +		  registers;
>> +- interrupts	: CSI-2 Host interrupt
>> +- data-lanes    : Number of lanes to be used
> 
> Is that fixed at synthesis time or configurable at runtime ?
> 

The max number is fixed at synthesis time, but you can configure it for lower
values. I added this option here because, although configurable, it's usually a
fixed value.

>> +- output-type   : Core output to be used (IPI-> 0 or IDI->1 or BOTH->2)
> 
> What are IPI and IDI ?
> 

IPI is Image Pixel Interface and IDI Image Data Interface, these are the two
types of data output support by our CSI-2 Host controller

>> +- phys, phy-names: List of one PHY specifier and identifier string (as
>> defined
>> +  in Documentation/devicetree/bindings/phy/phy-bindings.txt).
> 
> A PHY for what ?
> 

Our controller needs a PHY, in this case a MIPI DPHY, to interact with a CSI-2
receiver (usually a sensor).

>> +Optional properties(if in IPI mode):
>> +- ipi-mode 	: Mode to be used when in IPI(Camera -> 0 or Automatic -> 1)
>> +- ipi-color-mode: Color depth to be used in IPI (48 bits -> 0 or 16 bits ->
>> 1)
>> +- ipi-auto-flush: Data auto-flush (1 -> Yes or 0 -> No)
>> +- virtual-channel: Virtual channel where data is present when in IPI
> 
> We need more details than that, this is impossible to review, sorry.
> 

Sure, I'll add more details to the descripton

>> +The per-board settings:
>> + - port sub-node describing a single endpoint connected to the dw-mipi-csi
>> +   as described in video-interfaces.txt[1].
> 
> An example would be nice.
> 

I'll add an example of how we're using it.

>> diff --git a/Documentation/devicetree/bindings/media/snps,plat-ipk.txt
>> b/Documentation/devicetree/bindings/media/snps,plat-ipk.txt new file mode
>> 100644
>> index 0000000..2d51541
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/media/snps,plat-ipk.txt
>> @@ -0,0 +1,9 @@
>> +Synopsys DesignWare CSI-2 Host IPK Media Device
>> +
>> +This Media Device at the moment is not totally functional, however it is a
>> base
>> +for the future.
> 
> Then let's add it later :-) We don't want to design incomplete transient DT 
> bindings.
> 

I'm afraid I wasn't completely clear. This setup is fully functional. Actually
this sentence made sense in the past, but no longer does now.

>> +Required properties:
>> +
>> +- compatible: Must be "snps,plat-ipk".
>> +
>> diff --git a/Documentation/devicetree/bindings/media/snps,video-device.txt
>> b/Documentation/devicetree/bindings/media/snps,video-device.txt new file
>> mode 100644
>> index 0000000..d467092
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/media/snps,video-device.txt
>> @@ -0,0 +1,12 @@
>> +Synopsys DesignWare CSI-2 Host video device
>> +
>> +This driver handles all the video handling part of this platform.
> 
> This is a DT binding documentation, drivers are irrelevant. You should 
> describe the hardware only.
> 
> More information is needed, based on this document I can't tell what the 
> "CSI-2 host video device" is.
> 

You're right, I'll add a more detailed description.

>> +Required properties:
>> +
>> +- compatible: Must be "snps,video-device".
>> +
>> +- dmas, dma-names: List of one DMA specifier and identifier string (as
>> defined
>> +  in Documentation/devicetree/bindings/dma/dma.txt) per port. Each port
>> +  requires a DMA channel with the identifier string set to "port" followed
>> by
>> +  the port index.
> 

Thanks once again,
Ramiro Oliveira

[PATCH 2/2] Add basic support for DW CSI-2 Host IPK

[Ramiro Oliveira]

Add support for basic configuration of the DW CSI-2 Host IPK

Signed-off-by: Ramiro Oliveira <roliveir@synopsys.com>
---
 MAINTAINERS                                 |   7 +
 drivers/media/platform/Kconfig              |   1 +
 drivers/media/platform/Makefile             |   2 +
 drivers/media/platform/dwc/Kconfig          |  36 ++
 drivers/media/platform/dwc/Makefile         |   3 +
 drivers/media/platform/dwc/dw_mipi_csi.c    | 687 +++++++++++++++++++++++
 drivers/media/platform/dwc/dw_mipi_csi.h    | 179 ++++++
 drivers/media/platform/dwc/plat_ipk.c       | 835 ++++++++++++++++++++++++++++
 drivers/media/platform/dwc/plat_ipk.h       |  97 ++++
 drivers/media/platform/dwc/plat_ipk_video.h |  97 ++++
 drivers/media/platform/dwc/video_device.c   | 741 ++++++++++++++++++++++++
 drivers/media/platform/dwc/video_device.h   | 101 ++++
 12 files changed, 2786 insertions(+)
 create mode 100644 drivers/media/platform/dwc/Kconfig
 create mode 100644 drivers/media/platform/dwc/Makefile
 create mode 100644 drivers/media/platform/dwc/dw_mipi_csi.c
 create mode 100644 drivers/media/platform/dwc/dw_mipi_csi.h
 create mode 100644 drivers/media/platform/dwc/plat_ipk.c
 create mode 100644 drivers/media/platform/dwc/plat_ipk.h
 create mode 100644 drivers/media/platform/dwc/plat_ipk_video.h
 create mode 100644 drivers/media/platform/dwc/video_device.c
 create mode 100644 drivers/media/platform/dwc/video_device.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 6a71422..f54dfd8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10618,6 +10618,13 @@ S:	Maintained
 F:	drivers/staging/media/st-cec/
 F:	Documentation/devicetree/bindings/media/stih-cec.txt
 
+SYNOPSYS DESIGNWARE CSI-2 HOST IPK DRIVER
+M:	Ramiro Oliveira <roliveir@synopsys.com>
+L:	linux-media@vger.kernel.org
+T:	git git://linuxtv.org/media_tree.git
+S:	Maintained
+F:	drivers/media/platform/dwc/
+
 SYNOPSYS DESIGNWARE DMAC DRIVER
 M:	Viresh Kumar <vireshk@kernel.org>
 M:	Andy Shevchenko <andriy.shevchenko@linux.intel.com>
diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index 754edbf1..6fef760f 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -120,6 +120,7 @@ source "drivers/media/platform/am437x/Kconfig"
 source "drivers/media/platform/xilinx/Kconfig"
 source "drivers/media/platform/rcar-vin/Kconfig"
 source "drivers/media/platform/atmel/Kconfig"
+source "drivers/media/platform/dwc/Kconfig"
 
 config VIDEO_TI_CAL
 	tristate "TI CAL (Camera Adaptation Layer) driver"
diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
index f842933..623f5d2 100644
--- a/drivers/media/platform/Makefile
+++ b/drivers/media/platform/Makefile
@@ -61,6 +61,8 @@ obj-$(CONFIG_VIDEO_RCAR_VIN)		+= rcar-vin/
 
 obj-$(CONFIG_VIDEO_ATMEL_ISC)		+= atmel/
 
+obj-$(CONFIG_VIDEO_DWC)			+= dwc/
+
 ccflags-y += -I$(srctree)/drivers/media/i2c
 
 obj-$(CONFIG_VIDEO_MEDIATEK_VPU)	+= mtk-vpu/
diff --git a/drivers/media/platform/dwc/Kconfig b/drivers/media/platform/dwc/Kconfig
new file mode 100644
index 0000000..fb8533b
--- /dev/null
+++ b/drivers/media/platform/dwc/Kconfig
@@ -0,0 +1,36 @@
+config VIDEO_DWC
+	bool "Designware Cores CSI-2 IPK (EXPERIMENTAL)"
+	depends on VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API && OF && HAS_DMA
+	help
+	  Say Y here to enable support for the DesignWare Cores CSI-2 Host IP
+	  Prototyping Kit.
+
+if VIDEO_DWC
+config DWC_PLATFORM
+	tristate "SNPS DWC MIPI CSI2 Host"
+	depends on VIDEO_DWC
+	help
+	  This is the V4L2 plaftorm driver driver for the DWC CSI-2 HOST IPK
+
+	  To compile this driver as a module, choose M here
+
+
+config DWC_MIPI_CSI2_HOST
+	tristate "SNPS DWC MIPI CSI2 Host"
+	select GENERIC_PHY
+	depends on VIDEO_DWC
+	help
+	  This is a V4L2 driver for SNPS DWC MIPI-CSI2
+
+	  To compile this driver as a module, choose M here
+
+config DWC_VIDEO_DEVICE
+	tristate "DWC VIDEO DEVICE"
+	select VIDEOBUF2_VMALLOC
+	select VIDEOBUF2_DMA_CONTIG
+	depends on VIDEO_DWC
+	help
+	  This is a V4L2 driver for SNPS Video device
+	  To compile this driver as a module, choose M here
+
+endif # VIDEO_DWC
diff --git a/drivers/media/platform/dwc/Makefile b/drivers/media/platform/dwc/Makefile
new file mode 100644
index 0000000..75c74b7
--- /dev/null
+++ b/drivers/media/platform/dwc/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_DWC_PLATFORM)		+= plat_ipk.o
+obj-$(CONFIG_DWC_MIPI_CSI2_HOST)	+= dw_mipi_csi.o
+obj-$(CONFIG_DWC_VIDEO_DEVICE)		+= video_device.o
diff --git a/drivers/media/platform/dwc/dw_mipi_csi.c b/drivers/media/platform/dwc/dw_mipi_csi.c
new file mode 100644
index 0000000..1337a5e
--- /dev/null
+++ b/drivers/media/platform/dwc/dw_mipi_csi.c
@@ -0,0 +1,687 @@
+/*
+ * DWC MIPI CSI-2 Host device driver
+ *
+ * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
+ * Author: Ramiro Oliveira <ramiro.oliveira@synopsys.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation, either version 2 of the License,
+ * or (at your option) any later version.
+ */
+
+
+#include "dw_mipi_csi.h"
+
+/** @short Driver args: debug */
+static unsigned int debug;
+module_param(debug, uint, 0644);
+MODULE_PARM_DESC(debug, "Activates debug info");
+
+/*
+ * Basic IO read and write operations
+ */
+
+/**
+ * @short Video formats supported by the MIPI CSI-2
+ */
+static const struct mipi_fmt dw_mipi_csi_formats[] = {
+	{
+	 .name = "RAW BGGR 8",
+	 .code = MEDIA_BUS_FMT_SBGGR8_1X8,
+	 .depth = 8,
+	 },
+	{
+	 .name = "RAW10",
+	 .code = MEDIA_BUS_FMT_SBGGR10_2X8_PADHI_BE,
+	 .depth = 10,
+	 },
+	{
+	 .name = "RGB565",
+	 .code = MEDIA_BUS_FMT_RGB565_2X8_BE,
+	 .depth = 16,
+	 },
+	{
+	 .name = "BGR565",
+	 .code = MEDIA_BUS_FMT_RGB565_2X8_LE,
+	 .depth = 16,
+	 },
+	{
+	 .name = "RGB888",
+	 .code = MEDIA_BUS_FMT_RGB888_2X12_LE,
+	 .depth = 24,
+	 },
+	{
+	 .name = "BGR888",
+	 .code = MEDIA_BUS_FMT_RGB888_2X12_BE,
+	 .depth = 24,
+	 },
+};
+
+static struct mipi_csi_dev *
+sd_to_mipi_csi_dev(struct v4l2_subdev *sdev)
+{
+	return container_of(sdev, struct mipi_csi_dev, sd);
+}
+
+void
+dw_mipi_csi_write(struct mipi_csi_dev *dev,
+		  unsigned int address, unsigned int data)
+{
+	iowrite32(data, dev->base_address + address);
+}
+
+u32
+dw_mipi_csi_read(struct mipi_csi_dev *dev, unsigned long address)
+{
+	return ioread32(dev->base_address + address);
+}
+
+void
+dw_mipi_csi_write_part(struct mipi_csi_dev *dev,
+		       unsigned long address, unsigned long data,
+		       unsigned char shift, unsigned char width)
+{
+	u32 mask = (1 << width) - 1;
+	u32 temp = dw_mipi_csi_read(dev, address);
+
+	temp &= ~(mask << shift);
+	temp |= (data & mask) << shift;
+	dw_mipi_csi_write(dev, address, temp);
+}
+
+static const struct mipi_fmt *
+find_dw_mipi_csi_format(struct v4l2_mbus_framefmt *mf)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(dw_mipi_csi_formats); i++)
+		if (mf->code == dw_mipi_csi_formats[i].code)
+			return &dw_mipi_csi_formats[i];
+	return NULL;
+}
+
+int
+enable_video_output(struct mipi_csi_dev *dev)
+{
+	return 0;
+}
+
+int
+disable_video_output(struct mipi_csi_dev *dev)
+{
+	phy_power_off(dev->phy);
+	return 0;
+}
+
+static void
+dw_mipi_csi_reset(struct mipi_csi_dev *dev)
+{
+	dw_mipi_csi_write(dev, R_CSI2_CTRL_RESETN, 0);
+	/* mdelay(1); */
+	dw_mipi_csi_write(dev, R_CSI2_CTRL_RESETN, 1);
+}
+
+static int
+dw_mipi_csi_mask_irq_power_off(struct mipi_csi_dev *dev)
+{
+	/* set only one lane (lane 0) as active (ON) */
+	dw_mipi_csi_write(dev, R_CSI2_N_LANES, 0);
+
+	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PHY_FATAL, 0);
+	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PKT_FATAL, 0);
+	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_FRAME_FATAL, 0);
+	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PHY, 0);
+	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PKT, 0);
+	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_LINE, 0);
+	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_IPI, 0);
+
+	dw_mipi_csi_write(dev, R_CSI2_CTRL_RESETN, 0);
+
+	return 0;
+
+}
+
+static int
+dw_mipi_csi_hw_stdby(struct mipi_csi_dev *dev)
+{
+	/* set only one lane (lane 0) as active (ON) */
+	dw_mipi_csi_reset(dev);
+
+	dw_mipi_csi_write(dev, R_CSI2_N_LANES, 0);
+
+	phy_init(dev->phy);
+
+	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PHY_FATAL, 0xFFFFFFFF);
+	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PKT_FATAL, 0xFFFFFFFF);
+	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_FRAME_FATAL, 0xFFFFFFFF);
+	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PHY, 0xFFFFFFFF);
+	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PKT, 0xFFFFFFFF);
+	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_LINE, 0xFFFFFFFF);
+	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_IPI, 0xFFFFFFFF);
+
+	return 0;
+
+}
+
+void
+dw_mipi_csi_set_ipi_fmt(struct mipi_csi_dev *dev)
+{
+	switch (dev->fmt->code) {
+	case MEDIA_BUS_FMT_RGB565_2X8_BE:
+	case MEDIA_BUS_FMT_RGB565_2X8_LE:
+		dw_mipi_csi_write(dev, R_CSI2_IPI_DATA_TYPE, CSI_2_RGB565);
+		v4l2_dbg(1, debug, &dev->sd, "DT: RGB 565");
+		break;
+
+	case MEDIA_BUS_FMT_RGB888_2X12_LE:
+	case MEDIA_BUS_FMT_RGB888_2X12_BE:
+		dw_mipi_csi_write(dev, R_CSI2_IPI_DATA_TYPE, CSI_2_RGB888);
+		v4l2_dbg(1, debug, &dev->sd, "DT: RGB 888");
+		break;
+	case MEDIA_BUS_FMT_SBGGR10_2X8_PADHI_BE:
+		dw_mipi_csi_write(dev, R_CSI2_IPI_DATA_TYPE, CSI_2_RAW10);
+		v4l2_dbg(1, debug, &dev->sd, "DT: RAW 10");
+		break;
+	case MEDIA_BUS_FMT_SBGGR8_1X8:
+		dw_mipi_csi_write(dev, R_CSI2_IPI_DATA_TYPE, CSI_2_RAW8);
+		v4l2_dbg(1, debug, &dev->sd, "DT: RAW 8");
+		break;
+	default:
+		dw_mipi_csi_write(dev, R_CSI2_IPI_DATA_TYPE, CSI_2_RGB565);
+		v4l2_dbg(1, debug, &dev->sd, "Error");
+		break;
+	}
+}
+
+void
+__dw_mipi_csi_fill_timings(struct mipi_csi_dev *dev,
+			   const struct v4l2_bt_timings *bt)
+{
+
+	if (bt == NULL)
+		return;
+
+	dev->hw.hsa = bt->hsync;
+	dev->hw.hbp = bt->hbackporch;
+	dev->hw.hsd = bt->hsync;
+	dev->hw.htotal = bt->height + bt->vfrontporch +
+	    bt->vsync + bt->vbackporch;
+	dev->hw.vsa = bt->vsync;
+	dev->hw.vbp = bt->vbackporch;
+	dev->hw.vfp = bt->vfrontporch;
+	dev->hw.vactive = bt->height;
+}
+
+void
+dw_mipi_csi_start(struct mipi_csi_dev *dev)
+{
+	const struct v4l2_bt_timings *bt = &v4l2_dv_timings_presets[0].bt;
+
+	__dw_mipi_csi_fill_timings(dev, bt);
+
+	dw_mipi_csi_write(dev, R_CSI2_N_LANES, (dev->hw.num_lanes - 1));
+	v4l2_dbg(1, debug, &dev->sd, "N Lanes: %d\n", dev->hw.num_lanes);
+
+	/*IPI Related Configuration */
+	if ((dev->hw.output_type == IPI_OUT)
+	    || (dev->hw.output_type == BOTH_OUT)) {
+
+		dw_mipi_csi_write_part(dev, R_CSI2_IPI_MODE, dev->hw.ipi_mode,
+				       0, 1);
+		v4l2_dbg(1, debug, &dev->sd, "IPI MODE: %d\n",
+			 dev->hw.ipi_mode);
+
+		dw_mipi_csi_write_part(dev, R_CSI2_IPI_MODE,
+				       dev->hw.ipi_color_mode, 8, 1);
+		v4l2_dbg(1, debug, &dev->sd, "Color Mode: %d\n",
+			 dev->hw.ipi_color_mode);
+
+		dw_mipi_csi_write(dev, R_CSI2_IPI_VCID, dev->hw.virtual_ch);
+		v4l2_dbg(1, debug, &dev->sd, "Virtual Channel: %d\n",
+			 dev->hw.virtual_ch);
+
+		dw_mipi_csi_write_part(dev, R_CSI2_IPI_MEM_FLUSH,
+				       dev->hw.ipi_auto_flush, 8, 1);
+		v4l2_dbg(1, debug, &dev->sd, "Auto-flush: %d\n",
+			 dev->hw.ipi_auto_flush);
+
+		dw_mipi_csi_write(dev, R_CSI2_IPI_HSA_TIME, dev->hw.hsa);
+		v4l2_dbg(1, debug, &dev->sd, "HSA: %d\n", dev->hw.hsa);
+
+		dw_mipi_csi_write(dev, R_CSI2_IPI_HBP_TIME, dev->hw.hbp);
+		v4l2_dbg(1, debug, &dev->sd, "HBP: %d\n", dev->hw.hbp);
+
+		dw_mipi_csi_write(dev, R_CSI2_IPI_HSD_TIME, dev->hw.hsd);
+		v4l2_dbg(1, debug, &dev->sd, "HSD: %d\n", dev->hw.hsd);
+
+		if (dev->hw.ipi_mode == AUTO_TIMING) {
+			dw_mipi_csi_write(dev, R_CSI2_IPI_HLINE_TIME,
+					  dev->hw.htotal);
+			v4l2_dbg(1, debug, &dev->sd, "H total: %d\n",
+				 dev->hw.htotal);
+
+			dw_mipi_csi_write(dev, R_CSI2_IPI_VSA_LINES,
+					  dev->hw.vsa);
+			v4l2_dbg(1, debug, &dev->sd, "VSA: %d\n", dev->hw.vsa);
+
+			dw_mipi_csi_write(dev, R_CSI2_IPI_VBP_LINES,
+					  dev->hw.vbp);
+			v4l2_dbg(1, debug, &dev->sd, "VBP: %d\n", dev->hw.vbp);
+
+			dw_mipi_csi_write(dev, R_CSI2_IPI_VFP_LINES,
+					  dev->hw.vfp);
+			v4l2_dbg(1, debug, &dev->sd, "VFP: %d\n", dev->hw.vfp);
+
+			dw_mipi_csi_write(dev, R_CSI2_IPI_VACTIVE_LINES,
+					  dev->hw.vactive);
+			v4l2_dbg(1, debug, &dev->sd, "V Active: %d\n",
+				 dev->hw.vactive);
+		}
+	}
+
+	phy_power_on(dev->phy);
+}
+
+static int
+dw_mipi_csi_enum_mbus_code(struct v4l2_subdev *sd,
+			   struct v4l2_subdev_pad_config *cfg,
+			   struct v4l2_subdev_mbus_code_enum *code)
+{
+	if (code->index >= ARRAY_SIZE(dw_mipi_csi_formats))
+		return -EINVAL;
+
+	code->code = dw_mipi_csi_formats[code->index].code;
+	return 0;
+}
+
+static struct mipi_fmt const *
+dw_mipi_csi_try_format(struct v4l2_mbus_framefmt *mf)
+{
+	struct mipi_fmt const *fmt;
+
+	fmt = find_dw_mipi_csi_format(mf);
+	if (fmt == NULL)
+		fmt = &dw_mipi_csi_formats[0];
+
+	mf->code = fmt->code;
+	return fmt;
+}
+
+static struct v4l2_mbus_framefmt *
+__dw_mipi_csi_get_format(struct mipi_csi_dev *dev,
+			 struct v4l2_subdev_pad_config *cfg,
+			 enum v4l2_subdev_format_whence which)
+{
+	if (which == V4L2_SUBDEV_FORMAT_TRY)
+		return cfg ? v4l2_subdev_get_try_format(&dev->sd, cfg,
+							0) : NULL;
+
+	return &dev->format;
+}
+
+static int
+dw_mipi_csi_set_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg,
+		    struct v4l2_subdev_format *fmt)
+{
+	struct mipi_csi_dev *dev = sd_to_mipi_csi_dev(sd);
+	struct mipi_fmt const *dev_fmt;
+	struct v4l2_mbus_framefmt *mf;
+	int i = 0;
+	const struct v4l2_bt_timings *bt_r = &v4l2_dv_timings_presets[0].bt;
+
+	mf = __dw_mipi_csi_get_format(dev, cfg, fmt->which);
+
+	dev_fmt = dw_mipi_csi_try_format(&fmt->format);
+	if (dev_fmt) {
+		*mf = fmt->format;
+		if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE)
+			dev->fmt = dev_fmt;
+		dw_mipi_csi_set_ipi_fmt(dev);
+	}
+	while (v4l2_dv_timings_presets[i].bt.width) {
+		const struct v4l2_bt_timings *bt =
+		    &v4l2_dv_timings_presets[i].bt;
+		if (mf->width == bt->width && mf->height == bt->width) {
+			__dw_mipi_csi_fill_timings(dev, bt);
+			return 0;
+		}
+		i++;
+	}
+
+	__dw_mipi_csi_fill_timings(dev, bt_r);
+	return 0;
+
+}
+
+static int
+dw_mipi_csi_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg,
+		    struct v4l2_subdev_format *fmt)
+{
+	struct mipi_csi_dev *dev = sd_to_mipi_csi_dev(sd);
+	struct v4l2_mbus_framefmt *mf;
+
+	mf = __dw_mipi_csi_get_format(dev, cfg, fmt->which);
+	if (!mf)
+		return -EINVAL;
+
+	mutex_lock(&dev->lock);
+	fmt->format = *mf;
+	mutex_unlock(&dev->lock);
+	return 0;
+}
+
+static int
+dw_mipi_csi_s_power(struct v4l2_subdev *sd, int on)
+{
+	struct mipi_csi_dev *dev = sd_to_mipi_csi_dev(sd);
+
+	if (on) {
+		dw_mipi_csi_hw_stdby(dev);
+		dw_mipi_csi_start(dev);
+	} else {
+		dw_mipi_csi_mask_irq_power_off(dev);
+	}
+
+	return 0;
+}
+
+static int
+dw_mipi_csi_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+	struct v4l2_mbus_framefmt *format =
+	    v4l2_subdev_get_try_format(sd, fh->pad, 0);
+
+	format->colorspace = V4L2_COLORSPACE_SRGB;
+	format->code = dw_mipi_csi_formats[0].code;
+	format->width = MIN_WIDTH;
+	format->height = MIN_HEIGHT;
+	format->field = V4L2_FIELD_NONE;
+
+	return 0;
+}
+
+static const struct v4l2_subdev_internal_ops dw_mipi_csi_sd_internal_ops = {
+	.open = dw_mipi_csi_open,
+};
+
+static struct v4l2_subdev_core_ops dw_mipi_csi_core_ops = {
+	.s_power = dw_mipi_csi_s_power,
+};
+
+static struct v4l2_subdev_pad_ops dw_mipi_csi_pad_ops = {
+	.enum_mbus_code = dw_mipi_csi_enum_mbus_code,
+	.get_fmt = dw_mipi_csi_get_fmt,
+	.set_fmt = dw_mipi_csi_set_fmt,
+};
+
+static struct v4l2_subdev_ops dw_mipi_csi_subdev_ops = {
+	.core = &dw_mipi_csi_core_ops,
+	.pad = &dw_mipi_csi_pad_ops,
+};
+
+static irqreturn_t
+dw_mipi_csi_irq1(int irq, void *dev_id)
+{
+
+	struct mipi_csi_dev *dev = dev_id;
+	u32 int_status, ind_status;
+	unsigned long flags;
+
+	int_status = dw_mipi_csi_read(dev, R_CSI2_INTERRUPT);
+	spin_lock_irqsave(&dev->slock, flags);
+
+	if (int_status & CSI2_INT_PHY_FATAL) {
+		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_PHY_FATAL);
+		pr_info_ratelimited("%08X CSI INT PHY FATAL: %08X\n",
+				    (uint32_t) dev->base_address, ind_status);
+	}
+
+	if (int_status & CSI2_INT_PKT_FATAL) {
+		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_PKT_FATAL);
+		pr_info_ratelimited("%08X CSI INT PKT FATAL: %08X\n",
+				    (uint32_t) dev->base_address, ind_status);
+	}
+
+	if (int_status & CSI2_INT_FRAME_FATAL) {
+		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_FRAME_FATAL);
+		pr_info_ratelimited("%08X CSI INT FRAME FATAL: %08X\n",
+				    (uint32_t) dev->base_address, ind_status);
+	}
+
+	if (int_status & CSI2_INT_PHY) {
+		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_PHY);
+		pr_info_ratelimited("%08X CSI INT PHY: %08X\n",
+				    (uint32_t) dev->base_address, ind_status);
+	}
+
+	if (int_status & CSI2_INT_PKT) {
+		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_PKT);
+		pr_info_ratelimited("%08X CSI INT PKT: %08X\n",
+				    (uint32_t) dev->base_address, ind_status);
+	}
+
+	if (int_status & CSI2_INT_LINE) {
+		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_LINE);
+		pr_info_ratelimited("%08X CSI INT LINE: %08X\n",
+				    (uint32_t) dev->base_address, ind_status);
+	}
+
+	if (int_status & CSI2_INT_IPI) {
+		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_IPI);
+		pr_info_ratelimited("%08X CSI INT IPI: %08X\n",
+				    (uint32_t) dev->base_address, ind_status);
+	}
+	spin_unlock_irqrestore(&dev->slock, flags);
+	return IRQ_HANDLED;
+}
+
+static int
+dw_mipi_csi_parse_dt(struct platform_device *pdev, struct mipi_csi_dev *dev)
+{
+	struct device_node *node = pdev->dev.of_node;
+	int reg;
+	int ret = 0;
+
+	/* Device tree information */
+	ret = of_property_read_u32(node, "data-lanes", &dev->hw.num_lanes);
+	if (ret) {
+		dev_err(&pdev->dev, "Couldn't read data-lanes\n");
+		return ret;
+	}
+
+	ret = of_property_read_u32(node, "output-type", &dev->hw.output_type);
+	if (ret) {
+		dev_err(&pdev->dev, "Couldn't read output-type\n");
+		return ret;
+	}
+
+	ret = of_property_read_u32(node, "ipi-mode", &dev->hw.ipi_mode);
+	if (ret) {
+		dev_err(&pdev->dev, "Couldn't read ipi-mode\n");
+		return ret;
+	}
+
+	ret =
+	    of_property_read_u32(node, "ipi-auto-flush",
+				 &dev->hw.ipi_auto_flush);
+	if (ret) {
+		dev_err(&pdev->dev, "Couldn't read ipi-auto-flush\n");
+		return ret;
+	}
+
+	ret =
+	    of_property_read_u32(node, "ipi-color-mode",
+				 &dev->hw.ipi_color_mode);
+	if (ret) {
+		dev_err(&pdev->dev, "Couldn't read ipi-color-mode\n");
+		return ret;
+	}
+
+	ret =
+	    of_property_read_u32(node, "virtual-channel", &dev->hw.virtual_ch);
+	if (ret) {
+		dev_err(&pdev->dev, "Couldn't read virtual-channel\n");
+		return ret;
+	}
+
+	node = of_get_child_by_name(node, "port");
+	if (!node)
+		return -EINVAL;
+
+	ret = of_property_read_u32(node, "reg", &reg);
+	if (ret) {
+		dev_err(&pdev->dev, "Couldn't read reg value\n");
+		return ret;
+	}
+	dev->index = reg - 1;
+
+	if (dev->index >= CSI_MAX_ENTITIES)
+		return -ENXIO;
+
+	return 0;
+}
+
+static const struct of_device_id dw_mipi_csi_of_match[];
+
+/**
+ * @short Initialization routine - Entry point of the driver
+ * @param[in] pdev pointer to the platform device structure
+ * @return 0 on success and a negative number on failure
+ * Refer to Linux errors.
+ */
+static int mipi_csi_probe(struct platform_device *pdev)
+{
+	const struct of_device_id *of_id;
+	struct device *dev = &pdev->dev;
+	struct resource *res = NULL;
+	struct mipi_csi_dev *mipi_csi;
+	int ret = -ENOMEM;
+
+	dev_info(&pdev->dev, "Installing MIPI CSI-2 module\n");
+
+	dev_dbg(&pdev->dev, "Device registration\n");
+	mipi_csi = devm_kzalloc(dev, sizeof(*mipi_csi), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	mutex_init(&mipi_csi->lock);
+	spin_lock_init(&mipi_csi->slock);
+	mipi_csi->pdev = pdev;
+
+	of_id = of_match_node(dw_mipi_csi_of_match, dev->of_node);
+	if (WARN_ON(of_id == NULL))
+		return -EINVAL;
+
+	ret = dw_mipi_csi_parse_dt(pdev, mipi_csi);
+	if (ret < 0)
+		return ret;
+
+	dev_info(dev, "Request DPHY\n");
+	mipi_csi->phy = devm_phy_get(dev, "csi2-dphy");
+	if (IS_ERR(mipi_csi->phy))
+		return PTR_ERR(mipi_csi->phy);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mipi_csi->base_address = devm_ioremap_resource(dev, res);
+
+	if (IS_ERR(mipi_csi->base_address))
+		return PTR_ERR(mipi_csi->base_address);
+
+	mipi_csi->ctrl_irq_number = platform_get_irq(pdev, 0);
+	if (mipi_csi->ctrl_irq_number <= 0) {
+		dev_err(dev, "IRQ number not set.\n");
+		return mipi_csi->ctrl_irq_number;
+	}
+
+	ret = devm_request_irq(dev, mipi_csi->ctrl_irq_number,
+			       dw_mipi_csi_irq1, IRQF_SHARED,
+			       dev_name(dev), mipi_csi);
+	if (ret) {
+		dev_err(dev, "IRQ failed\n");
+		goto end;
+	}
+
+	v4l2_subdev_init(&mipi_csi->sd, &dw_mipi_csi_subdev_ops);
+	mipi_csi->sd.owner = THIS_MODULE;
+	snprintf(mipi_csi->sd.name, sizeof(mipi_csi->sd.name), "%s.%d",
+		 CSI_DEVICE_NAME, mipi_csi->index);
+	mipi_csi->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	mipi_csi->fmt = &dw_mipi_csi_formats[0];
+
+	mipi_csi->format.code = dw_mipi_csi_formats[0].code;
+	mipi_csi->format.width = MIN_WIDTH;
+	mipi_csi->format.height = MIN_HEIGHT;
+
+	mipi_csi->pads[CSI_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
+	mipi_csi->pads[CSI_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
+	ret = media_entity_pads_init(&mipi_csi->sd.entity,
+				     CSI_PADS_NUM, mipi_csi->pads);
+
+	if (ret < 0) {
+		dev_err(dev, "Media Entity init failed\n");
+		goto entity_cleanup;
+	}
+
+	/* This allows to retrieve the platform device id by the host driver */
+	v4l2_set_subdevdata(&mipi_csi->sd, pdev);
+
+	/* .. and a pointer to the subdev. */
+	platform_set_drvdata(pdev, &mipi_csi->sd);
+
+	dw_mipi_csi_mask_irq_power_off(mipi_csi);
+	dev_info(dev, "DW MIPI CSI-2 Host registered successfully\n");
+	return 0;
+
+entity_cleanup:
+	media_entity_cleanup(&mipi_csi->sd.entity);
+end:
+	return ret;
+}
+
+/**
+ * @short Exit routine - Exit point of the driver
+ * @param[in] pdev pointer to the platform device structure
+ * @return 0 on success and a negative number on failure
+ * Refer to Linux errors.
+ */
+static int mipi_csi_remove(struct platform_device *pdev)
+{
+	struct v4l2_subdev *sd = platform_get_drvdata(pdev);
+	struct mipi_csi_dev *mipi_csi = sd_to_mipi_csi_dev(sd);
+
+	dev_dbg(&pdev->dev, "Removing MIPI CSI-2 module\n");
+	media_entity_cleanup(&mipi_csi->sd.entity);
+
+	return 0;
+}
+
+/**
+ * @short of_device_id structure
+ */
+static const struct of_device_id dw_mipi_csi_of_match[] = {
+	{
+	 .compatible = "snps,dw-mipi-csi"},
+	{ /* sentinel */ },
+};
+
+MODULE_DEVICE_TABLE(of, dw_mipi_csi_of_match);
+
+/**
+ * @short Platform driver structure
+ */
+static struct platform_driver __refdata dw_mipi_csi_pdrv = {
+	.remove = mipi_csi_remove,
+	.probe = mipi_csi_probe,
+	.driver = {
+		   .name = CSI_DEVICE_NAME,
+		   .owner = THIS_MODULE,
+		   .of_match_table = dw_mipi_csi_of_match,
+		   },
+};
+
+module_platform_driver(dw_mipi_csi_pdrv);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ramiro Oliveira <roliveir@synopsys.com>");
+MODULE_DESCRIPTION("Synopsys DW MIPI CSI-2 Host driver");
diff --git a/drivers/media/platform/dwc/dw_mipi_csi.h b/drivers/media/platform/dwc/dw_mipi_csi.h
new file mode 100644
index 0000000..5e4c48c
--- /dev/null
+++ b/drivers/media/platform/dwc/dw_mipi_csi.h
@@ -0,0 +1,179 @@
+/*
+ * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef DW_MIPI_CSI_H_
+#define DW_MIPI_CSI_H_
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/platform_device.h>
+#include <linux/of_irq.h>
+#include <linux/of_graph.h>
+#include <linux/delay.h>
+#include <linux/wait.h>
+#include <linux/string.h>
+#include <linux/phy/phy.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-dv-timings.h>
+#include <linux/videodev2.h>
+#include <linux/io.h>
+
+#include "plat_ipk_video.h"
+
+#define CSI_DEVICE_NAME	"dw-mipi-csi"
+
+/** @short DWC MIPI CSI-2 register addresses*/
+enum register_addresses {
+	R_CSI2_VERSION = 0x00,
+	R_CSI2_N_LANES = 0x04,
+	R_CSI2_CTRL_RESETN = 0x08,
+	R_CSI2_INTERRUPT = 0x0C,
+	R_CSI2_DATA_IDS_1 = 0x10,
+	R_CSI2_DATA_IDS_2 = 0x14,
+	R_CSI2_IPI_MODE = 0x80,
+	R_CSI2_IPI_VCID = 0x84,
+	R_CSI2_IPI_DATA_TYPE = 0x88,
+	R_CSI2_IPI_MEM_FLUSH = 0x8C,
+	R_CSI2_IPI_HSA_TIME = 0x90,
+	R_CSI2_IPI_HBP_TIME = 0x94,
+	R_CSI2_IPI_HSD_TIME = 0x98,
+	R_CSI2_IPI_HLINE_TIME = 0x9C,
+	R_CSI2_IPI_VSA_LINES = 0xB0,
+	R_CSI2_IPI_VBP_LINES = 0xB4,
+	R_CSI2_IPI_VFP_LINES = 0xB8,
+	R_CSI2_IPI_VACTIVE_LINES = 0xBC,
+	R_CSI2_INT_PHY_FATAL = 0xe0,
+	R_CSI2_MASK_INT_PHY_FATAL = 0xe4,
+	R_CSI2_FORCE_INT_PHY_FATAL = 0xe8,
+	R_CSI2_INT_PKT_FATAL = 0xf0,
+	R_CSI2_MASK_INT_PKT_FATAL = 0xf4,
+	R_CSI2_FORCE_INT_PKT_FATAL = 0xf8,
+	R_CSI2_INT_FRAME_FATAL = 0x100,
+	R_CSI2_MASK_INT_FRAME_FATAL = 0x104,
+	R_CSI2_FORCE_INT_FRAME_FATAL = 0x108,
+	R_CSI2_INT_PHY = 0x110,
+	R_CSI2_MASK_INT_PHY = 0x114,
+	R_CSI2_FORCE_INT_PHY = 0x118,
+	R_CSI2_INT_PKT = 0x120,
+	R_CSI2_MASK_INT_PKT = 0x124,
+	R_CSI2_FORCE_INT_PKT = 0x128,
+	R_CSI2_INT_LINE = 0x130,
+	R_CSI2_MASK_INT_LINE = 0x134,
+	R_CSI2_FORCE_INT_LINE = 0x138,
+	R_CSI2_INT_IPI = 0x140,
+	R_CSI2_MASK_INT_IPI = 0x144,
+	R_CSI2_FORCE_INT_IPI = 0x148
+};
+
+/** @short IPI Data Types */
+enum data_type {
+	CSI_2_YUV420_8 = 0x18,
+	CSI_2_YUV420_10 = 0x19,
+	CSI_2_YUV420_8_LEG = 0x1A,
+	CSI_2_YUV420_8_SHIFT = 0x1C,
+	CSI_2_YUV420_10_SHIFT = 0x1D,
+	CSI_2_YUV422_8 = 0x1E,
+	CSI_2_YUV422_10 = 0x1F,
+	CSI_2_RGB444 = 0x20,
+	CSI_2_RGB555 = 0x21,
+	CSI_2_RGB565 = 0x22,
+	CSI_2_RGB666 = 0x23,
+	CSI_2_RGB888 = 0x24,
+	CSI_2_RAW6 = 0x28,
+	CSI_2_RAW7 = 0x29,
+	CSI_2_RAW8 = 0x2A,
+	CSI_2_RAW10 = 0x2B,
+	CSI_2_RAW12 = 0x2C,
+	CSI_2_RAW14 = 0x2D,
+};
+
+/** @short Interrupt Masks */
+enum interrupt_type {
+	CSI2_INT_PHY_FATAL = 1 << 0,
+	CSI2_INT_PKT_FATAL = 1 << 1,
+	CSI2_INT_FRAME_FATAL = 1 << 2,
+	CSI2_INT_PHY = 1 << 16,
+	CSI2_INT_PKT = 1 << 17,
+	CSI2_INT_LINE = 1 << 18,
+	CSI2_INT_IPI = 1 << 19,
+
+};
+
+/** @short DWC MIPI CSI-2 output types*/
+enum output_type {
+	IPI_OUT = 0,
+	IDI_OUT = 1,
+	BOTH_OUT = 2
+};
+
+/** @short IPI output types*/
+enum ipi_output_type {
+	CAMERA_TIMING = 0,
+	AUTO_TIMING = 1
+};
+
+/**
+ * @short Format template
+ */
+struct mipi_fmt {
+	const char *name;
+	u32 code;
+	u8 depth;
+};
+
+struct csi_hw {
+
+	uint32_t num_lanes;
+	uint32_t output_type;
+
+	/*IPI Info */
+	uint32_t ipi_mode;
+	uint32_t ipi_color_mode;
+	uint32_t ipi_auto_flush;
+	uint32_t virtual_ch;
+
+	uint32_t hsa;
+	uint32_t hbp;
+	uint32_t hsd;
+	uint32_t htotal;
+
+	uint32_t vsa;
+	uint32_t vbp;
+	uint32_t vfp;
+	uint32_t vactive;
+};
+
+/**
+ * @short Structure to embed device driver information
+ */
+struct mipi_csi_dev {
+	struct v4l2_subdev sd;
+	struct video_device vdev;
+
+	struct mutex lock;
+	spinlock_t slock;
+	struct media_pad pads[CSI_PADS_NUM];
+	struct platform_device *pdev;
+	u8 index;
+
+	/** Store current format */
+	const struct mipi_fmt *fmt;
+	struct v4l2_mbus_framefmt format;
+
+	/** Device Tree Information */
+	void __iomem *base_address;
+	uint32_t ctrl_irq_number;
+
+	struct csi_hw hw;
+
+	struct phy *phy;
+};
+
+#endif				/* DW_MIPI_CSI */
diff --git a/drivers/media/platform/dwc/plat_ipk.c b/drivers/media/platform/dwc/plat_ipk.c
new file mode 100644
index 0000000..48b9e36
--- /dev/null
+++ b/drivers/media/platform/dwc/plat_ipk.c
@@ -0,0 +1,835 @@
+/**
+ * DWC MIPI CSI-2 Host IPK platform device driver
+ *
+ * Based on Omnivision OV7670 Camera Driver
+ * Copyright (C) 2011 - 2013 Samsung Electronics Co., Ltd.
+ * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
+ *
+ * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
+ * Author: Ramiro Oliveira <ramiro.oliveira@synopsys.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation, either version 2 of the License,
+ * or (at your option) any later version.
+ */
+
+#include "plat_ipk.h"
+#include "video_device.h"
+#include "dw_mipi_csi.h"
+#include <media/v4l2-of.h>
+#include <media/v4l2-subdev.h>
+
+static int
+__plat_ipk_pipeline_s_format(struct plat_ipk_media_pipeline *ep,
+			     struct v4l2_subdev_format *fmt)
+{
+
+	struct plat_ipk_pipeline *p = to_plat_ipk_pipeline(ep);
+	static const u8 seq[IDX_MAX] = {IDX_SENSOR, IDX_CSI, IDX_VDEV};
+
+	fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
+	v4l2_subdev_call(p->subdevs[seq[IDX_CSI]], pad, set_fmt, NULL, fmt);
+
+	return 0;
+}
+
+static void
+plat_ipk_pipeline_prepare(struct plat_ipk_pipeline *p, struct media_entity *me)
+{
+	struct v4l2_subdev *sd;
+	int i = 0;
+
+	for (i = 0; i < IDX_MAX; i++)
+		p->subdevs[i] = NULL;
+
+	while (1) {
+		struct media_pad *pad = NULL;
+
+		for (i = 0; i < me->num_pads; i++) {
+			struct media_pad *spad = &me->pads[i];
+
+			if (!(spad->flags & MEDIA_PAD_FL_SINK))
+				continue;
+
+			pad = media_entity_remote_pad(spad);
+			if (pad)
+				break;
+		}
+		if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
+			break;
+
+		sd = media_entity_to_v4l2_subdev(pad->entity);
+
+		switch (sd->grp_id) {
+		case GRP_ID_SENSOR:
+			p->subdevs[IDX_SENSOR] = sd;
+			break;
+		case GRP_ID_CSI:
+			p->subdevs[IDX_CSI] = sd;
+			break;
+		case GRP_ID_VIDEODEV:
+			p->subdevs[IDX_VDEV] = sd;
+			break;
+		default:
+			break;
+		}
+		me = &sd->entity;
+		if (me->num_pads == 1)
+			break;
+	}
+}
+
+static int __subdev_set_power(struct v4l2_subdev *sd, int on)
+{
+	int *use_count;
+	int ret;
+
+	if (sd == NULL) {
+		pr_info("null subdev\n");
+		return -ENXIO;
+	}
+	use_count = &sd->entity.use_count;
+	if (on && (*use_count)++ > 0)
+		return 0;
+	else if (!on && (*use_count == 0 || --(*use_count) > 0))
+		return 0;
+
+	pr_debug("%d %s !\n", on, sd->entity.name);
+	ret = v4l2_subdev_call(sd, core, s_power, on);
+
+	return ret != -ENOIOCTLCMD ? ret : 0;
+}
+
+static int plat_ipk_pipeline_s_power(struct plat_ipk_pipeline *p, bool on)
+{
+	static const u8 seq[IDX_MAX] = {IDX_CSI, IDX_SENSOR, IDX_VDEV};
+	int i, ret = 0;
+
+	for (i = 0; i < IDX_MAX; i++) {
+		unsigned int idx = seq[i];
+
+		if (p->subdevs[idx] == NULL)
+			pr_info("No device registered on %d\n", idx);
+		else {
+			ret = __subdev_set_power(p->subdevs[idx], on);
+			if (ret < 0 && ret != -ENXIO)
+				goto error;
+		}
+	}
+	return 0;
+error:
+	for (; i >= 0; i--) {
+		unsigned int idx = seq[i];
+
+		__subdev_set_power(p->subdevs[idx], !on);
+	}
+	return ret;
+}
+
+static int
+__plat_ipk_pipeline_open(struct plat_ipk_media_pipeline *ep,
+			 struct media_entity *me, bool prepare)
+{
+	struct plat_ipk_pipeline *p = to_plat_ipk_pipeline(ep);
+	int ret;
+
+	if (WARN_ON(p == NULL || me == NULL))
+		return -EINVAL;
+
+	if (prepare)
+		plat_ipk_pipeline_prepare(p, me);
+
+	ret = plat_ipk_pipeline_s_power(p, 1);
+	if (!ret)
+		return 0;
+
+	return ret;
+}
+
+static int __plat_ipk_pipeline_close(struct plat_ipk_media_pipeline *ep)
+{
+	struct plat_ipk_pipeline *p = to_plat_ipk_pipeline(ep);
+	int ret;
+
+	ret = plat_ipk_pipeline_s_power(p, 0);
+
+	return ret == -ENXIO ? 0 : ret;
+}
+
+static int
+__plat_ipk_pipeline_s_stream(struct plat_ipk_media_pipeline *ep, bool on)
+{
+	static const u8 seq[IDX_MAX] = {IDX_SENSOR, IDX_CSI, IDX_VDEV};
+	struct plat_ipk_pipeline *p = to_plat_ipk_pipeline(ep);
+	int i, ret = 0;
+
+	for (i = 0; i < IDX_MAX; i++) {
+		unsigned int idx = seq[i];
+
+		if (p->subdevs[idx] == NULL)
+			pr_debug("No device registered on %d\n", idx);
+		else {
+			ret =
+			    v4l2_subdev_call(p->subdevs[idx], video, s_stream,
+					     on);
+
+			if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
+				goto error;
+		}
+	}
+	return 0;
+error:
+	for (; i >= 0; i--) {
+		unsigned int idx = seq[i];
+
+		v4l2_subdev_call(p->subdevs[idx], video, s_stream, !on);
+	}
+	return ret;
+}
+
+static const struct plat_ipk_media_pipeline_ops plat_ipk_pipeline_ops = {
+	.open = __plat_ipk_pipeline_open,
+	.close = __plat_ipk_pipeline_close,
+	.set_format = __plat_ipk_pipeline_s_format,
+	.set_stream = __plat_ipk_pipeline_s_stream,
+};
+
+static struct plat_ipk_media_pipeline *
+plat_ipk_pipeline_create(struct plat_ipk_dev *plat_ipk)
+{
+	struct plat_ipk_pipeline *p;
+
+	p = kzalloc(sizeof(*p), GFP_KERNEL);
+	if (!p)
+		return NULL;
+
+	list_add_tail(&p->list, &plat_ipk->pipelines);
+
+	p->ep.ops = &plat_ipk_pipeline_ops;
+	return &p->ep;
+}
+
+static void
+plat_ipk_pipelines_free(struct plat_ipk_dev *plat_ipk)
+{
+	while (!list_empty(&plat_ipk->pipelines)) {
+		struct plat_ipk_pipeline *p;
+
+		p = list_entry(plat_ipk->pipelines.next, typeof(*p), list);
+		list_del(&p->list);
+		kfree(p);
+	}
+}
+
+static int
+plat_ipk_parse_port_node(struct plat_ipk_dev *plat_ipk,
+			 struct device_node *port, unsigned int index)
+{
+	struct device_node *rem, *ep;
+	struct v4l2_of_endpoint endpoint;
+	struct plat_ipk_source_info *pd = &plat_ipk->sensor[index].pdata;
+
+	/* Assume here a port node can have only one endpoint node. */
+	ep = of_get_next_child(port, NULL);
+	if (!ep)
+		return 0;
+
+	v4l2_of_parse_endpoint(ep, &endpoint);
+	if (WARN_ON(endpoint.base.port == 0) || index >= PLAT_MAX_SENSORS)
+		return -EINVAL;
+
+	pd->mux_id = endpoint.base.port - 1;
+
+	rem = of_graph_get_remote_port_parent(ep);
+	of_node_put(ep);
+	if (rem == NULL) {
+		v4l2_info(&plat_ipk->v4l2_dev,
+			  "Remote device at %s not found\n", ep->full_name);
+		return 0;
+	}
+
+	if (WARN_ON(index >= ARRAY_SIZE(plat_ipk->sensor)))
+		return -EINVAL;
+
+	plat_ipk->sensor[index].asd.match_type = V4L2_ASYNC_MATCH_OF;
+	plat_ipk->sensor[index].asd.match.of.node = rem;
+	plat_ipk->async_subdevs[index] = &plat_ipk->sensor[index].asd;
+
+	plat_ipk->num_sensors++;
+
+	of_node_put(rem);
+	return 0;
+}
+
+
+static int plat_ipk_register_sensor_entities(struct plat_ipk_dev *plat_ipk)
+{
+	struct device_node *parent = plat_ipk->pdev->dev.of_node;
+	struct device_node *node;
+	int index = 0;
+	int ret;
+
+	plat_ipk->num_sensors = 0;
+
+	for_each_available_child_of_node(parent, node) {
+		struct device_node *port;
+
+		if (of_node_cmp(node->name, "csi2"))
+			continue;
+		port = of_get_next_child(node, NULL);
+		if (!port)
+			continue;
+
+		ret = plat_ipk_parse_port_node(plat_ipk, port, index);
+		if (ret < 0)
+			return ret;
+		index++;
+	}
+	return 0;
+}
+
+static int
+__of_get_port_id(struct device_node *np)
+{
+	u32 reg = 0;
+
+	np = of_get_child_by_name(np, "port");
+	if (!np)
+		return -EINVAL;
+	of_property_read_u32(np, "reg", &reg);
+
+	return reg - 1;
+}
+
+static int register_videodev_entity(struct plat_ipk_dev *plat_ipk,
+			 struct video_device_dev *vid_dev)
+{
+	struct v4l2_subdev *sd;
+	struct plat_ipk_media_pipeline *ep;
+	int ret;
+
+	sd = &vid_dev->subdev;
+	sd->grp_id = GRP_ID_VIDEODEV;
+
+	ep = plat_ipk_pipeline_create(plat_ipk);
+	if (!ep)
+		return -ENOMEM;
+
+	v4l2_set_subdev_hostdata(sd, ep);
+
+	ret = v4l2_device_register_subdev(&plat_ipk->v4l2_dev, sd);
+	if (!ret)
+		plat_ipk->vid_dev = vid_dev;
+	else
+		v4l2_err(&plat_ipk->v4l2_dev,
+			 "Failed to register Video Device\n");
+	return ret;
+}
+
+static int register_mipi_csi_entity(struct plat_ipk_dev *plat_ipk,
+			 struct platform_device *pdev, struct v4l2_subdev *sd)
+{
+	struct device_node *node = pdev->dev.of_node;
+	int id, ret;
+
+	id = node ? __of_get_port_id(node) : max(0, pdev->id);
+
+	if (WARN_ON(id < 0 || id >= CSI_MAX_ENTITIES))
+		return -ENOENT;
+
+	if (WARN_ON(plat_ipk->mipi_csi[id].sd))
+		return -EBUSY;
+
+	sd->grp_id = GRP_ID_CSI;
+	ret = v4l2_device_register_subdev(&plat_ipk->v4l2_dev, sd);
+
+	if (!ret)
+		plat_ipk->mipi_csi[id].sd = sd;
+	else
+		v4l2_err(&plat_ipk->v4l2_dev,
+			 "Failed to register MIPI-CSI.%d (%d)\n", id, ret);
+	return ret;
+}
+
+static int plat_ipk_register_platform_entity(struct plat_ipk_dev *plat_ipk,
+				struct platform_device *pdev, int plat_entity)
+{
+	struct device *dev = &pdev->dev;
+	int ret = -EPROBE_DEFER;
+	void *drvdata;
+
+
+	device_lock(dev);
+	if (!dev->driver || !try_module_get(dev->driver->owner))
+		goto dev_unlock;
+
+	drvdata = dev_get_drvdata(dev);
+
+	if (drvdata) {
+		switch (plat_entity) {
+		case IDX_VDEV:
+			ret = register_videodev_entity(plat_ipk, drvdata);
+			break;
+		case IDX_CSI:
+			ret = register_mipi_csi_entity(plat_ipk, pdev, drvdata);
+			break;
+		default:
+			ret = -ENODEV;
+		}
+	} else
+		dev_err(&plat_ipk->pdev->dev, "%s no drvdata\n", dev_name(dev));
+	module_put(dev->driver->owner);
+dev_unlock:
+	device_unlock(dev);
+	if (ret == -EPROBE_DEFER)
+		dev_info(&plat_ipk->pdev->dev,
+			 "deferring %s device registration\n", dev_name(dev));
+	else if (ret < 0)
+		dev_err(&plat_ipk->pdev->dev,
+			"%s device registration failed (%d)\n", dev_name(dev),
+			ret);
+	return ret;
+}
+
+static int
+plat_ipk_register_platform_entities(struct plat_ipk_dev *plat_ipk,
+				    struct device_node *parent)
+{
+	struct device_node *node;
+	int ret = 0;
+
+	for_each_available_child_of_node(parent, node) {
+		struct platform_device *pdev;
+		int plat_entity = -1;
+
+		pdev = of_find_device_by_node(node);
+		if (!pdev)
+			continue;
+
+		if (!strcmp(node->name, VIDEODEV_OF_NODE_NAME))
+			plat_entity = IDX_VDEV;
+		else if (!strcmp(node->name, CSI_OF_NODE_NAME))
+			plat_entity = IDX_CSI;
+
+		if (plat_entity >= 0)
+			ret = plat_ipk_register_platform_entity(plat_ipk, pdev,
+								plat_entity);
+		put_device(&pdev->dev);
+		if (ret < 0)
+			break;
+	}
+
+	return ret;
+}
+
+static void
+plat_ipk_unregister_entities(struct plat_ipk_dev *plat_ipk)
+{
+	int i;
+	struct video_device_dev *dev = plat_ipk->vid_dev;
+
+	if (dev == NULL)
+		return;
+	v4l2_device_unregister_subdev(&dev->subdev);
+	dev->ve.pipe = NULL;
+	plat_ipk->vid_dev = NULL;
+
+	for (i = 0; i < CSI_MAX_ENTITIES; i++) {
+		if (plat_ipk->mipi_csi[i].sd == NULL)
+			continue;
+		v4l2_device_unregister_subdev(plat_ipk->mipi_csi[i].sd);
+		plat_ipk->mipi_csi[i].sd = NULL;
+	}
+
+	v4l2_info(&plat_ipk->v4l2_dev, "Unregistered all entities\n");
+}
+
+static int
+__plat_ipk_create_videodev_sink_links(struct plat_ipk_dev *plat_ipk,
+				      struct media_entity *source,
+				      int pad)
+{
+	struct media_entity *sink;
+	int ret = 0;
+
+	if (!plat_ipk->vid_dev)
+		return 0;
+
+	sink = &plat_ipk->vid_dev->subdev.entity;
+	ret = media_create_pad_link(source, pad, sink,
+				    CSI_PAD_SOURCE, MEDIA_LNK_FL_ENABLED);
+	if (ret)
+		return ret;
+
+	ret = media_entity_call(sink, link_setup, &sink->pads[0],
+				&source->pads[pad], 0);
+	if (ret)
+		return 0;
+
+	v4l2_info(&plat_ipk->v4l2_dev, "created link [%s] -> [%s]\n",
+		  source->name, sink->name);
+
+	return 0;
+}
+
+
+static int
+__plat_ipk_create_videodev_source_links(struct plat_ipk_dev *plat_ipk)
+{
+	struct media_entity *source, *sink;
+	int ret = 0;
+
+	struct video_device_dev *vid_dev = plat_ipk->vid_dev;
+
+	if (vid_dev == NULL)
+		return -ENODEV;
+
+	source = &vid_dev->subdev.entity;
+	sink = &vid_dev->ve.vdev.entity;
+
+	ret = media_create_pad_link(source, VIDEO_DEV_SD_PAD_SOURCE_DMA,
+				    sink, 0, MEDIA_LNK_FL_ENABLED);
+
+	v4l2_info(&plat_ipk->v4l2_dev, "created link [%s] -> [%s]\n",
+		  source->name, sink->name);
+	return ret;
+}
+
+static int
+plat_ipk_create_links(struct plat_ipk_dev *plat_ipk)
+{
+	struct v4l2_subdev *csi_sensor[CSI_MAX_ENTITIES] = { NULL };
+	struct v4l2_subdev *sensor, *csi;
+	struct media_entity *source;
+	struct plat_ipk_source_info *pdata;
+	int i, pad, ret = 0;
+
+	for (i = 0; i < plat_ipk->num_sensors; i++) {
+		if (plat_ipk->sensor[i].subdev == NULL)
+			continue;
+
+		sensor = plat_ipk->sensor[i].subdev;
+		pdata = v4l2_get_subdev_hostdata(sensor);
+		if (!pdata)
+			continue;
+
+		source = NULL;
+
+		csi = plat_ipk->mipi_csi[pdata->mux_id].sd;
+		if (WARN(csi == NULL, "MIPI-CSI interface specified but	dw-mipi-csi module is not loaded!\n"))
+			return -EINVAL;
+
+		pad = sensor->entity.num_pads - 1;
+		ret = media_create_pad_link(&sensor->entity, pad,
+					    &csi->entity, CSI_PAD_SINK,
+					    MEDIA_LNK_FL_IMMUTABLE |
+					    MEDIA_LNK_FL_ENABLED);
+
+		if (ret)
+			return ret;
+		v4l2_info(&plat_ipk->v4l2_dev, "created link [%s] -> [%s]\n",
+			  sensor->entity.name, csi->entity.name);
+
+		csi_sensor[pdata->mux_id] = sensor;
+	}
+
+	for (i = 0; i < CSI_MAX_ENTITIES; i++) {
+		if (plat_ipk->mipi_csi[i].sd == NULL) {
+			pr_info("no link\n");
+			continue;
+		}
+
+		source = &plat_ipk->mipi_csi[i].sd->entity;
+		pad = VIDEO_DEV_SD_PAD_SINK_CSI;
+
+		ret = __plat_ipk_create_videodev_sink_links(plat_ipk, source,
+								pad);
+	}
+
+	ret = __plat_ipk_create_videodev_source_links(plat_ipk);
+	if (ret < 0)
+		return ret;
+
+	return ret;
+}
+
+static int __plat_ipk_modify_pipeline(struct media_entity *entity, bool enable)
+{
+	struct plat_ipk_video_entity *ve;
+	struct plat_ipk_pipeline *p;
+	struct video_device *vdev;
+	int ret;
+
+	vdev = media_entity_to_video_device(entity);
+
+	if (vdev->entity.use_count == 0)
+		return 0;
+
+	ve = vdev_to_plat_ipk_video_entity(vdev);
+	p = to_plat_ipk_pipeline(ve->pipe);
+
+	if (enable)
+		ret = __plat_ipk_pipeline_open(ve->pipe, entity, true);
+	else
+		ret = __plat_ipk_pipeline_close(ve->pipe);
+
+	if (ret == 0 && !enable)
+		memset(p->subdevs, 0, sizeof(p->subdevs));
+
+	return ret;
+}
+
+
+static int
+__plat_ipk_modify_pipelines(struct media_entity *entity, bool enable,
+			    struct media_entity_graph *graph)
+{
+	struct media_entity *entity_err = entity;
+	int ret;
+
+	media_entity_graph_walk_start(graph, entity);
+
+	while ((entity = media_entity_graph_walk_next(graph))) {
+		if (!is_media_entity_v4l2_video_device(entity))
+			continue;
+
+		ret = __plat_ipk_modify_pipeline(entity, enable);
+
+		if (ret < 0)
+			goto err;
+	}
+
+	return 0;
+
+err:
+	media_entity_graph_walk_start(graph, entity_err);
+
+	while ((entity_err = media_entity_graph_walk_next(graph))) {
+		if (!is_media_entity_v4l2_video_device(entity_err))
+			continue;
+
+		__plat_ipk_modify_pipeline(entity_err, !enable);
+
+		if (entity_err == entity)
+			break;
+	}
+
+	return ret;
+}
+
+static int
+plat_ipk_link_notify(struct media_link *link, unsigned int flags,
+		     unsigned int notification)
+{
+	struct media_entity_graph *graph =
+	    &container_of(link->graph_obj.mdev, struct plat_ipk_dev,
+			  media_dev)->link_setup_graph;
+	struct media_entity *sink = link->sink->entity;
+	int ret = 0;
+
+	pr_debug("Link notify\n");
+
+	if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH) {
+		ret = media_entity_graph_walk_init(graph, link->graph_obj.mdev);
+		if (ret)
+			return ret;
+		if (!(flags & MEDIA_LNK_FL_ENABLED))
+			ret = __plat_ipk_modify_pipelines(sink, false, graph);
+
+	} else if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH) {
+		if (link->flags & MEDIA_LNK_FL_ENABLED)
+			ret = __plat_ipk_modify_pipelines(sink, true, graph);
+		media_entity_graph_walk_cleanup(graph);
+	}
+
+	return ret ? -EPIPE : 0;
+}
+static const struct media_device_ops plat_ipk_media_ops = {
+	.link_notify = plat_ipk_link_notify,
+};
+
+
+static int
+subdev_notifier_bound(struct v4l2_async_notifier *notifier,
+		      struct v4l2_subdev *subdev, struct v4l2_async_subdev *asd)
+{
+	struct plat_ipk_dev *plat_ipk = notifier_to_plat_ipk(notifier);
+	struct plat_ipk_sensor_info *si = NULL;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(plat_ipk->sensor); i++)
+		if (plat_ipk->sensor[i].asd.match.of.node ==
+		    subdev->dev->of_node)
+			si = &plat_ipk->sensor[i];
+
+	if (si == NULL)
+		return -EINVAL;
+
+	v4l2_set_subdev_hostdata(subdev, &si->pdata);
+
+	subdev->grp_id = GRP_ID_SENSOR;
+
+	si->subdev = subdev;
+
+	v4l2_info(&plat_ipk->v4l2_dev, "Registered sensor subdevice: %s (%d)\n",
+		  subdev->name, plat_ipk->num_sensors);
+
+	plat_ipk->num_sensors++;
+
+	return 0;
+}
+
+static int
+subdev_notifier_complete(struct v4l2_async_notifier *notifier)
+{
+	struct plat_ipk_dev *plat_ipk = notifier_to_plat_ipk(notifier);
+	int ret;
+
+	mutex_lock(&plat_ipk->media_dev.graph_mutex);
+
+	ret = plat_ipk_create_links(plat_ipk);
+	if (ret < 0)
+		goto unlock;
+
+	ret = v4l2_device_register_subdev_nodes(&plat_ipk->v4l2_dev);
+unlock:
+	mutex_unlock(&plat_ipk->media_dev.graph_mutex);
+	if (ret < 0)
+		return ret;
+
+	return media_device_register(&plat_ipk->media_dev);
+}
+
+static const struct of_device_id plat_ipk_of_match[];
+
+static int plat_ipk_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct v4l2_device *v4l2_dev;
+	struct plat_ipk_dev *plat_ipk;
+	int ret;
+
+	dev_info(dev, "Installing DW MIPI CSI-2 IPK Platform module\n");
+
+	plat_ipk = devm_kzalloc(dev, sizeof(*plat_ipk), GFP_KERNEL);
+	if (!plat_ipk)
+		return -ENOMEM;
+
+	spin_lock_init(&plat_ipk->slock);
+	INIT_LIST_HEAD(&plat_ipk->pipelines);
+	plat_ipk->pdev = pdev;
+
+	strlcpy(plat_ipk->media_dev.model, "SNPS IPK Platform",
+		sizeof(plat_ipk->media_dev.model));
+	plat_ipk->media_dev.ops = &plat_ipk_media_ops;
+	plat_ipk->media_dev.dev = dev;
+
+	v4l2_dev = &plat_ipk->v4l2_dev;
+	v4l2_dev->mdev = &plat_ipk->media_dev;
+	strlcpy(v4l2_dev->name, "plat-ipk", sizeof(v4l2_dev->name));
+
+	media_device_init(&plat_ipk->media_dev);
+
+	ret = v4l2_device_register(dev, &plat_ipk->v4l2_dev);
+	if (ret < 0) {
+		v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, plat_ipk);
+
+	ret = plat_ipk_register_platform_entities(plat_ipk, dev->of_node);
+	if (ret)
+		goto err_m_ent;
+
+	ret = plat_ipk_register_sensor_entities(plat_ipk);
+	if (ret)
+		goto err_m_ent;
+
+	if (plat_ipk->num_sensors > 0) {
+		plat_ipk->subdev_notifier.subdevs = plat_ipk->async_subdevs;
+		plat_ipk->subdev_notifier.num_subdevs = plat_ipk->num_sensors;
+		plat_ipk->subdev_notifier.bound = subdev_notifier_bound;
+		plat_ipk->subdev_notifier.complete = subdev_notifier_complete;
+		plat_ipk->num_sensors = 0;
+
+		ret = v4l2_async_notifier_register(&plat_ipk->v4l2_dev,
+						   &plat_ipk->subdev_notifier);
+		if (ret)
+			goto err_m_ent;
+	}
+
+	return 0;
+
+err_m_ent:
+	plat_ipk_unregister_entities(plat_ipk);
+	media_device_unregister(&plat_ipk->media_dev);
+	media_device_cleanup(&plat_ipk->media_dev);
+	v4l2_device_unregister(&plat_ipk->v4l2_dev);
+	return ret;
+}
+
+static int plat_ipk_remove(struct platform_device *pdev)
+{
+	struct plat_ipk_dev *dev = platform_get_drvdata(pdev);
+
+	if (!dev)
+		return 0;
+
+	v4l2_async_notifier_unregister(&dev->subdev_notifier);
+
+	v4l2_device_unregister(&dev->v4l2_dev);
+	plat_ipk_unregister_entities(dev);
+	plat_ipk_pipelines_free(dev);
+	media_device_unregister(&dev->media_dev);
+	media_device_cleanup(&dev->media_dev);
+
+	dev_info(&pdev->dev, "Driver removed\n");
+
+	return 0;
+}
+
+/**
+ * @short of_device_id structure
+ */
+static const struct of_device_id plat_ipk_of_match[] = {
+	{.compatible = "snps,plat-ipk"},
+	{}
+};
+
+MODULE_DEVICE_TABLE(of, plat_ipk_of_match);
+
+/**
+ * @short Platform driver structure
+ */
+static struct platform_driver plat_ipk_pdrv = {
+	.remove = plat_ipk_remove,
+	.probe = plat_ipk_probe,
+	.driver = {
+		   .name = "snps,plat-ipk",
+		   .owner = THIS_MODULE,
+		   .of_match_table = plat_ipk_of_match,
+		   },
+};
+
+static int __init
+plat_ipk_init(void)
+{
+	request_module("dw-mipi-csi");
+
+	return platform_driver_register(&plat_ipk_pdrv);
+}
+
+static void __exit
+plat_ipk_exit(void)
+{
+	platform_driver_unregister(&plat_ipk_pdrv);
+}
+
+module_init(plat_ipk_init);
+module_exit(plat_ipk_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ramiro Oliveira <roliveir@synopsys.com>");
+MODULE_DESCRIPTION("Platform driver for MIPI CSI-2 Host IPK");
diff --git a/drivers/media/platform/dwc/plat_ipk.h b/drivers/media/platform/dwc/plat_ipk.h
new file mode 100644
index 0000000..ef569eb
--- /dev/null
+++ b/drivers/media/platform/dwc/plat_ipk.h
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef PLAT_IPK_H_
+#define PLAT_IPK_H_
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/of_platform.h>
+#include <linux/list.h>
+#include <linux/string.h>
+#include <media/v4l2-device.h>
+#include <linux/videodev2.h>
+#include <media/media-entity.h>
+
+#include "plat_ipk_video.h"
+
+#define VIDEODEV_OF_NODE_NAME	"video-device"
+#define CSI_OF_NODE_NAME	"csi2"
+
+enum plat_ipk_subdev_index {
+	IDX_SENSOR,
+	IDX_CSI,
+	IDX_VDEV,
+	IDX_MAX,
+};
+
+struct plat_ipk_sensor_info {
+	struct plat_ipk_source_info pdata;
+	struct v4l2_async_subdev asd;
+	struct v4l2_subdev *subdev;
+	struct mipi_csi_dev *host;
+};
+
+struct plat_ipk_pipeline {
+	struct plat_ipk_media_pipeline ep;
+	struct list_head list;
+	struct media_entity *vdev_entity;
+	struct v4l2_subdev *subdevs[IDX_MAX];
+};
+
+#define to_plat_ipk_pipeline(_ep)\
+	 container_of(_ep, struct plat_ipk_pipeline, ep)
+
+struct mipi_csi_info {
+	struct v4l2_subdev *sd;
+	int id;
+};
+
+/**
+ * @short Structure to embed device driver information
+ */
+struct plat_ipk_dev {
+	struct mipi_csi_info		mipi_csi[CSI_MAX_ENTITIES];
+	struct video_device_dev		*vid_dev;
+	struct device			*dev;
+	struct media_device		media_dev;
+	struct v4l2_device		v4l2_dev;
+	struct platform_device		*pdev;
+	struct plat_ipk_sensor_info	sensor[PLAT_MAX_SENSORS];
+	struct v4l2_async_notifier	subdev_notifier;
+	struct v4l2_async_subdev	*async_subdevs[PLAT_MAX_SENSORS];
+	spinlock_t			slock;
+	struct list_head		pipelines;
+	int				num_sensors;
+	struct media_entity_graph	link_setup_graph;
+};
+
+static inline struct plat_ipk_dev *
+entity_to_plat_ipk_mdev(struct media_entity *me)
+{
+	return me->graph_obj.mdev == NULL ? NULL :
+	    container_of(me->graph_obj.mdev, struct plat_ipk_dev, media_dev);
+}
+
+static inline struct plat_ipk_dev *
+notifier_to_plat_ipk(struct v4l2_async_notifier *n)
+{
+	return container_of(n, struct plat_ipk_dev, subdev_notifier);
+}
+
+static inline void
+plat_ipk_graph_unlock(struct plat_ipk_video_entity *ve)
+{
+	mutex_unlock(&ve->vdev.entity.graph_obj.mdev->graph_mutex);
+}
+
+#endif				/* PLAT_IPK_H_ */
diff --git a/drivers/media/platform/dwc/plat_ipk_video.h b/drivers/media/platform/dwc/plat_ipk_video.h
new file mode 100644
index 0000000..6bfc9f8
--- /dev/null
+++ b/drivers/media/platform/dwc/plat_ipk_video.h
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef PLAT_IPK_INCLUDES_H_
+#define PLAT_IPK_INCLUDES_H_
+
+#include <media/media-entity.h>
+#include <media/v4l2-dev.h>
+#include <media/v4l2-mediabus.h>
+#include <media/v4l2-subdev.h>
+
+/*
+ * The subdevices' group IDs.
+ */
+
+#define MAX_WIDTH	3280
+#define MAX_HEIGHT	1852
+
+#define MIN_WIDTH	640
+#define MIN_HEIGHT	480
+
+#define GRP_ID_SENSOR		(10)
+#define GRP_ID_CSI		(20)
+#define GRP_ID_VIDEODEV		(30)
+
+#define CSI_MAX_ENTITIES	1
+#define PLAT_MAX_SENSORS	1
+
+enum video_dev_pads {
+	VIDEO_DEV_SD_PAD_SINK_CSI = 0,
+	VIDEO_DEV_SD_PAD_SOURCE_DMA = 1,
+	VIDEO_DEV_SD_PADS_NUM = 2,
+};
+
+enum mipi_csi_pads {
+	CSI_PAD_SINK = 0,
+	CSI_PAD_SOURCE = 1,
+	CSI_PADS_NUM = 2,
+};
+
+struct plat_ipk_source_info {
+	u16 flags;
+	u16 mux_id;
+};
+
+struct plat_ipk_fmt {
+	u32 mbus_code;
+	char *name;
+	u32 fourcc;
+	u8 depth;
+};
+
+struct plat_ipk_media_pipeline;
+
+/*
+ * Media pipeline operations to be called from within a video node,  i.e. the
+ * last entity within the pipeline. Implemented by related media device driver.
+ */
+struct plat_ipk_media_pipeline_ops {
+	int (*prepare)(struct plat_ipk_media_pipeline *p,
+			struct media_entity *me);
+	int (*unprepare)(struct plat_ipk_media_pipeline *p);
+	int (*open)(struct plat_ipk_media_pipeline *p,
+			struct media_entity *me, bool resume);
+	int (*close)(struct plat_ipk_media_pipeline *p);
+	int (*set_stream)(struct plat_ipk_media_pipeline *p, bool state);
+	int (*set_format)(struct plat_ipk_media_pipeline *p,
+			struct v4l2_subdev_format *fmt);
+};
+
+struct plat_ipk_video_entity {
+	struct video_device vdev;
+	struct plat_ipk_media_pipeline *pipe;
+};
+
+struct plat_ipk_media_pipeline {
+	struct media_pipeline mp;
+	const struct plat_ipk_media_pipeline_ops *ops;
+};
+
+static inline struct plat_ipk_video_entity *
+vdev_to_plat_ipk_video_entity(struct video_device *vdev)
+{
+	return container_of(vdev, struct plat_ipk_video_entity, vdev);
+}
+
+#define plat_ipk_pipeline_call(ent, op, args...)\
+	(!(ent) ? -ENOENT : (((ent)->pipe->ops && (ent)->pipe->ops->op) ? \
+	(ent)->pipe->ops->op(((ent)->pipe), ##args) : -ENOIOCTLCMD))	  \
+
+
+#endif				/* PLAT_IPK_INCLUDES_H_ */
diff --git a/drivers/media/platform/dwc/video_device.c b/drivers/media/platform/dwc/video_device.c
new file mode 100644
index 0000000..d827426
--- /dev/null
+++ b/drivers/media/platform/dwc/video_device.c
@@ -0,0 +1,741 @@
+/*
+ * DWC MIPI CSI-2 Host IPK video device device driver
+ *
+ * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
+ * Author: Ramiro Oliveira <ramiro.oliveira@synopsys.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation, either version 2 of the License,
+ * or (at your option) any later version.
+ */
+
+#include "video_device.h"
+
+const struct plat_ipk_fmt vid_dev_formats[] = {
+	{
+		.name = "RGB888",
+		.fourcc = V4L2_PIX_FMT_BGR24,
+		.depth = 24,
+		.mbus_code = MEDIA_BUS_FMT_RGB888_2X12_LE,
+	}, {
+		.name = "RGB565",
+		.fourcc = V4L2_PIX_FMT_RGB565,
+		.depth = 16,
+		.mbus_code = MEDIA_BUS_FMT_RGB565_2X8_BE,
+	},
+};
+
+const struct plat_ipk_fmt *
+vid_dev_find_format(struct v4l2_format *f, int index)
+{
+	const struct plat_ipk_fmt *fmt = NULL;
+	unsigned int i;
+
+	if (index >= (int) ARRAY_SIZE(vid_dev_formats))
+		return NULL;
+
+	for (i = 0; i < ARRAY_SIZE(vid_dev_formats); ++i) {
+		fmt = &vid_dev_formats[i];
+		if (fmt->fourcc == f->fmt.pix.pixelformat)
+			return fmt;
+	}
+	return NULL;
+}
+
+/*
+ * Video node ioctl operations
+ */
+static int
+vidioc_querycap(struct file *file, void *priv, struct v4l2_capability *cap)
+{
+	struct video_device_dev *vid_dev = video_drvdata(file);
+
+	strlcpy(cap->driver, VIDEO_DEVICE_NAME, sizeof(cap->driver));
+	strlcpy(cap->card, VIDEO_DEVICE_NAME, sizeof(cap->card));
+	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
+		 dev_name(&vid_dev->pdev->dev));
+
+	cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
+	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
+	return 0;
+}
+
+int
+vidioc_enum_fmt_vid_cap(struct file *file, void *priv, struct v4l2_fmtdesc *f)
+{
+	const struct plat_ipk_fmt *p_fmt;
+
+	if (f->index >= ARRAY_SIZE(vid_dev_formats))
+		return -EINVAL;
+
+	p_fmt = &vid_dev_formats[f->index];
+
+	strlcpy(f->description, p_fmt->name, sizeof(f->description));
+	f->pixelformat = p_fmt->fourcc;
+
+	return 0;
+}
+
+int vidioc_g_fmt_vid_cap(struct file *file, void *priv, struct v4l2_format *f)
+{
+	struct video_device_dev *dev = video_drvdata(file);
+
+	memcpy(&f->fmt.pix, &dev->format.fmt.pix,
+	       sizeof(struct v4l2_pix_format));
+
+	return 0;
+}
+
+static int
+vidioc_try_fmt_vid_cap(struct file *file, void *priv, struct v4l2_format *f)
+{
+	const struct plat_ipk_fmt *fmt;
+
+	fmt = vid_dev_find_format(f, -1);
+	if (!fmt) {
+		f->fmt.pix.pixelformat = V4L2_PIX_FMT_RGB565;
+		fmt = vid_dev_find_format(f, -1);
+	}
+
+	f->fmt.pix.field = V4L2_FIELD_NONE;
+	v4l_bound_align_image(&f->fmt.pix.width, 48, MAX_WIDTH, 2,
+			      &f->fmt.pix.height, 32, MAX_HEIGHT, 0, 0);
+
+	f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3;
+	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
+	f->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
+	return 0;
+}
+
+int vidioc_s_fmt_vid_cap(struct file *file, void *priv, struct v4l2_format *f)
+{
+	struct video_device_dev *dev = video_drvdata(file);
+	int ret;
+	struct v4l2_subdev_format fmt;
+
+	if (vb2_is_busy(&dev->vb_queue))
+		return -EBUSY;
+
+	ret = vidioc_try_fmt_vid_cap(file, dev, f);
+	if (ret)
+		return ret;
+
+	dev->fmt = vid_dev_find_format(f, -1);
+	pixel_format(dev) = f->fmt.pix.pixelformat;
+	width(dev) = f->fmt.pix.width;
+	height(dev) = f->fmt.pix.height;
+	bytes_per_line(dev) = width(dev) * dev->fmt->depth / 8;
+	size_image(dev) = height(dev) * bytes_per_line(dev);
+
+	fmt.format.colorspace = V4L2_COLORSPACE_SRGB;
+	fmt.format.code = dev->fmt->mbus_code;
+
+	fmt.format.width = width(dev);
+	fmt.format.height = height(dev);
+
+	ret = plat_ipk_pipeline_call(&dev->ve, set_format, &fmt);
+
+	return 0;
+}
+
+int vidioc_enum_framesizes(struct file *file, void *fh,
+		       struct v4l2_frmsizeenum *fsize)
+{
+	static const struct v4l2_frmsize_stepwise sizes = {
+		48, MAX_WIDTH, 4,
+		32, MAX_HEIGHT, 1
+	};
+	int i;
+
+	if (fsize->index)
+		return -EINVAL;
+	for (i = 0; i < ARRAY_SIZE(vid_dev_formats); i++)
+		if (vid_dev_formats[i].fourcc == fsize->pixel_format)
+			break;
+	if (i == ARRAY_SIZE(vid_dev_formats))
+		return -EINVAL;
+	fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
+	fsize->stepwise = sizes;
+	return 0;
+}
+
+int vidioc_enum_input(struct file *file, void *priv, struct v4l2_input *input)
+{
+	if (input->index != 0)
+		return -EINVAL;
+
+	input->type = V4L2_INPUT_TYPE_CAMERA;
+	input->std = V4L2_STD_ALL;	/* Not sure what should go here */
+	strcpy(input->name, "Camera");
+	return 0;
+}
+
+int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
+{
+	*i = 0;
+	return 0;
+}
+
+int vidioc_s_input(struct file *file, void *priv, unsigned int i)
+{
+	if (i != 0)
+		return -EINVAL;
+	return 0;
+}
+
+int vidioc_g_std(struct file *file, void *fh, v4l2_std_id *norm)
+{
+	*norm = V4L2_STD_NTSC_M;
+	return 0;
+}
+
+int vidioc_s_std(struct file *file, void *fh, v4l2_std_id a)
+{
+	return 0;
+}
+
+static int
+vid_dev_pipeline_validate(struct video_device_dev *vid_dev)
+{
+	return 0;
+}
+
+static int
+vid_dev_streamon(struct file *file, void *priv, enum v4l2_buf_type type)
+{
+	struct video_device_dev *vid_dev = video_drvdata(file);
+	struct media_entity *entity = &vid_dev->ve.vdev.entity;
+	int ret;
+
+	ret = media_entity_pipeline_start(entity, &vid_dev->ve.pipe->mp);
+	if (ret < 0)
+		return ret;
+
+	ret = vid_dev_pipeline_validate(vid_dev);
+	if (ret < 0)
+		goto err_p_stop;
+
+	vb2_ioctl_streamon(file, priv, type);
+	if (!ret)
+		return ret;
+
+err_p_stop:
+	media_entity_pipeline_stop(entity);
+	return 0;
+}
+
+static int
+vid_dev_streamoff(struct file *file, void *priv, enum v4l2_buf_type type)
+{
+	struct video_device_dev *vid_dev = video_drvdata(file);
+	int ret;
+
+	ret = vb2_ioctl_streamoff(file, priv, type);
+	if (ret < 0)
+		return ret;
+
+	media_entity_pipeline_stop(&vid_dev->ve.vdev.entity);
+	return 0;
+}
+
+static const struct v4l2_ioctl_ops vid_dev_ioctl_ops = {
+	.vidioc_querycap = vidioc_querycap,
+	.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
+	.vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
+	.vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
+	.vidioc_enum_framesizes = vidioc_enum_framesizes,
+	.vidioc_enum_input = vidioc_enum_input,
+	.vidioc_g_input = vidioc_g_input,
+	.vidioc_s_input = vidioc_s_input,
+
+	.vidioc_reqbufs = vb2_ioctl_reqbufs,
+	.vidioc_create_bufs = vb2_ioctl_create_bufs,
+	.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
+	.vidioc_querybuf = vb2_ioctl_querybuf,
+	.vidioc_qbuf = vb2_ioctl_qbuf,
+	.vidioc_dqbuf = vb2_ioctl_dqbuf,
+	.vidioc_streamon = vid_dev_streamon,
+	.vidioc_streamoff = vid_dev_streamoff,
+};
+
+/* Capture subdev media entity operations */
+static int
+vid_dev_link_setup(struct media_entity *entity,
+		   const struct media_pad *local,
+		   const struct media_pad *remote, u32 flags)
+{
+	return 0;
+}
+
+static const struct media_entity_operations vid_dev_subdev_media_ops = {
+	.link_setup = vid_dev_link_setup,
+};
+
+static int
+vid_dev_open(struct file *file)
+{
+	struct video_device_dev *vid_dev = video_drvdata(file);
+	struct media_entity *me = &vid_dev->ve.vdev.entity;
+	int ret;
+
+	mutex_lock(&vid_dev->lock);
+
+	ret = v4l2_fh_open(file);
+	if (ret < 0)
+		goto unlock;
+
+	if (!v4l2_fh_is_singular_file(file))
+		goto unlock;
+
+	mutex_lock(&me->graph_obj.mdev->graph_mutex);
+
+	ret = plat_ipk_pipeline_call(&vid_dev->ve, open, me, true);
+	if (ret == 0)
+		me->use_count++;
+
+	mutex_unlock(&me->graph_obj.mdev->graph_mutex);
+
+	if (!ret)
+		goto unlock;
+
+	v4l2_fh_release(file);
+unlock:
+	mutex_unlock(&vid_dev->lock);
+	return ret;
+}
+
+static int
+vid_dev_release(struct file *file)
+{
+	struct video_device_dev *vid_dev = video_drvdata(file);
+	struct media_entity *entity = &vid_dev->ve.vdev.entity;
+
+	mutex_lock(&vid_dev->lock);
+
+	if (v4l2_fh_is_singular_file(file)) {
+		plat_ipk_pipeline_call(&vid_dev->ve, close);
+		mutex_lock(&entity->graph_obj.mdev->graph_mutex);
+		entity->use_count--;
+		mutex_unlock(&entity->graph_obj.mdev->graph_mutex);
+	}
+
+	_vb2_fop_release(file, NULL);
+
+	mutex_unlock(&vid_dev->lock);
+	return 0;
+}
+
+static const struct v4l2_file_operations vid_dev_fops = {
+	.owner = THIS_MODULE,
+	.open = vid_dev_open,
+	.release = vid_dev_release,
+	.write = vb2_fop_write,
+	.read = vb2_fop_read,
+	.poll = vb2_fop_poll,
+	.unlocked_ioctl = video_ioctl2,
+	.mmap = vb2_fop_mmap,
+};
+
+/*
+ * VideoBuffer2 operations
+ */
+
+void fill_buffer(struct video_device_dev *dev, struct rx_buffer *buf,
+			int buf_num, unsigned long flags)
+{
+	int size = 0;
+	void *vbuf = NULL;
+
+	if (&buf->vb == NULL)
+		return;
+
+	size = vb2_plane_size(&buf->vb.vb2_buf, 0);
+	vbuf = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
+
+	if (vbuf) {
+		spin_unlock_irqrestore(&dev->slock, flags);
+
+		memcpy(vbuf, dev->dma_buf[buf_num].cpu_addr, size);
+
+		spin_lock_irqsave(&dev->slock, flags);
+
+		buf->vb.field = dev->format.fmt.pix.field;
+		buf->vb.sequence++;
+		buf->vb.vb2_buf.timestamp = ktime_get_ns();
+	}
+	vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
+}
+
+static void buffer_copy_process(void *param)
+{
+	struct video_device_dev *dev = (struct video_device_dev *) param;
+	unsigned long flags;
+	struct dmaqueue *dma_q = &dev->vidq;
+	struct rx_buffer *buf = NULL;
+
+	spin_lock_irqsave(&dev->slock, flags);
+
+	if (!list_empty(&dma_q->active)) {
+		buf = list_entry(dma_q->active.next, struct rx_buffer, list);
+		list_del(&buf->list);
+		fill_buffer(dev, buf, dev->last_idx, flags);
+	}
+
+	spin_unlock_irqrestore(&dev->slock, flags);
+}
+
+static inline struct rx_buffer *to_rx_buffer(struct vb2_v4l2_buffer *vb2)
+{
+	return container_of(vb2, struct rx_buffer, vb);
+}
+
+int queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
+			unsigned int *nplanes, unsigned int sizes[],
+			struct device *alloc_devs[])
+{
+	struct video_device_dev *dev = vb2_get_drv_priv(vq);
+	unsigned long size = 0;
+	int i;
+
+	size = size_image(dev);
+	if (size == 0)
+		return -EINVAL;
+
+	*nbuffers = N_BUFFERS;
+
+	for (i = 0; i < N_BUFFERS; i++) {
+		dev->dma_buf[i].cpu_addr = dma_alloc_coherent(&dev->pdev->dev,
+							      size_image(dev),
+							      &dev->
+							      dma_buf
+							      [i].dma_addr,
+							      GFP_KERNEL);
+	}
+
+	*nplanes = 1;
+	sizes[0] = size;
+
+	return 0;
+}
+
+int buffer_prepare(struct vb2_buffer *vb)
+{
+	struct rx_buffer *buf = NULL;
+	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+	int size = 0;
+
+	if (vb == NULL) {
+		pr_warn("%s:vb2_buffer is null\n", FUNC_NAME);
+		return 0;
+	}
+
+	buf = to_rx_buffer(vbuf);
+
+	size = vb2_plane_size(&buf->vb.vb2_buf, 0);
+	vb2_set_plane_payload(&buf->vb.vb2_buf, 0, size);
+
+	INIT_LIST_HEAD(&buf->list);
+	return 0;
+}
+
+void buffer_queue(struct vb2_buffer *vb)
+{
+	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+	struct video_device_dev *dev = NULL;
+	struct rx_buffer *buf = NULL;
+	struct dmaqueue *vidq = NULL;
+	struct dma_async_tx_descriptor *desc;
+	u32 flags;
+
+	if (vb == NULL) {
+		pr_warn("%s:vb2_buffer is null\n", FUNC_NAME);
+		return;
+	}
+
+	dev = vb2_get_drv_priv(vb->vb2_queue);
+	buf = to_rx_buffer(vbuf);
+	vidq = &dev->vidq;
+
+	flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
+	dev->xt.dir = DMA_DEV_TO_MEM;
+	dev->xt.src_sgl = false;
+	dev->xt.dst_inc = false;
+	dev->xt.dst_sgl = true;
+	dev->xt.dst_start = dev->dma_buf[dev->idx].dma_addr;
+
+	dev->last_idx = dev->idx;
+	dev->idx++;
+	if (dev->idx >= N_BUFFERS)
+		dev->idx = 0;
+
+	dev->xt.frame_size = 1;
+	dev->sgl[0].size = bytes_per_line(dev);
+	dev->sgl[0].icg = 0;
+	dev->xt.numf = height(dev);
+
+	desc = dmaengine_prep_interleaved_dma(dev->dma, &dev->xt, flags);
+	if (!desc) {
+		pr_err("Failed to prepare DMA transfer\n");
+		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+		return;
+	}
+
+	desc->callback = buffer_copy_process;
+	desc->callback_param = dev;
+
+	spin_lock(&dev->slock);
+	list_add_tail(&buf->list, &vidq->active);
+	spin_unlock(&dev->slock);
+
+	dmaengine_submit(desc);
+
+	if (vb2_is_streaming(&dev->vb_queue))
+		dma_async_issue_pending(dev->dma);
+}
+
+int start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+	struct video_device_dev *dev = vb2_get_drv_priv(vq);
+
+	dma_async_issue_pending(dev->dma);
+
+	return 0;
+}
+
+void stop_streaming(struct vb2_queue *vq)
+{
+	struct video_device_dev *dev = vb2_get_drv_priv(vq);
+	struct dmaqueue *dma_q = &dev->vidq;
+
+	/* Stop and reset the DMA engine. */
+	dmaengine_terminate_all(dev->dma);
+
+	while (!list_empty(&dma_q->active)) {
+		struct rx_buffer *buf;
+
+		buf = list_entry(dma_q->active.next, struct rx_buffer, list);
+		if (buf) {
+			list_del(&buf->list);
+			vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+		}
+	}
+	list_del_init(&dev->vidq.active);
+}
+
+static const struct vb2_ops vb2_video_qops = {
+	.queue_setup = queue_setup,
+	.buf_prepare = buffer_prepare,
+	.buf_queue = buffer_queue,
+	.start_streaming = start_streaming,
+	.stop_streaming = stop_streaming,
+	.wait_prepare = vb2_ops_wait_prepare,
+	.wait_finish = vb2_ops_wait_finish,
+};
+
+static int vid_dev_subdev_s_power(struct v4l2_subdev *sd, int on)
+{
+	return 0;
+}
+
+static int vid_dev_subdev_registered(struct v4l2_subdev *sd)
+{
+	struct video_device_dev *vid_dev = v4l2_get_subdevdata(sd);
+	struct vb2_queue *q = &vid_dev->vb_queue;
+	struct video_device *vfd = &vid_dev->ve.vdev;
+	int ret;
+
+	memset(vfd, 0, sizeof(*vfd));
+
+	snprintf(vfd->name, sizeof(vfd->name), VIDEO_DEVICE_NAME);
+
+	vfd->fops = &vid_dev_fops;
+	vfd->ioctl_ops = &vid_dev_ioctl_ops;
+	vfd->v4l2_dev = sd->v4l2_dev;
+	vfd->minor = -1;
+	vfd->release = video_device_release_empty;
+	vfd->queue = q;
+
+	INIT_LIST_HEAD(&vid_dev->vidq.active);
+	init_waitqueue_head(&vid_dev->vidq.wq);
+	memset(q, 0, sizeof(*q));
+	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	q->io_modes = VB2_MMAP | VB2_USERPTR;
+	q->ops = &vb2_video_qops;
+	q->mem_ops = &vb2_vmalloc_memops;
+	q->buf_struct_size = sizeof(struct rx_buffer);
+	q->drv_priv = vid_dev;
+	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+	q->lock = &vid_dev->lock;
+
+	ret = vb2_queue_init(q);
+	if (ret < 0)
+		return ret;
+
+	vid_dev->vd_pad.flags = MEDIA_PAD_FL_SINK;
+	ret = media_entity_pads_init(&vfd->entity, 1, &vid_dev->vd_pad);
+	if (ret < 0)
+		return ret;
+
+	video_set_drvdata(vfd, vid_dev);
+	vid_dev->ve.pipe = v4l2_get_subdev_hostdata(sd);
+
+	ret = video_register_device(vfd, VFL_TYPE_GRABBER, -1);
+	if (ret < 0) {
+		media_entity_cleanup(&vfd->entity);
+		vid_dev->ve.pipe = NULL;
+		return ret;
+	}
+
+	v4l2_info(sd->v4l2_dev, "Registered %s as /dev/%s\n",
+		  vfd->name, video_device_node_name(vfd));
+	return 0;
+}
+
+static void vid_dev_subdev_unregistered(struct v4l2_subdev *sd)
+{
+	struct video_device_dev *vid_dev = v4l2_get_subdevdata(sd);
+
+	if (vid_dev == NULL)
+		return;
+
+	mutex_lock(&vid_dev->lock);
+
+	if (video_is_registered(&vid_dev->ve.vdev)) {
+		video_unregister_device(&vid_dev->ve.vdev);
+		media_entity_cleanup(&vid_dev->ve.vdev.entity);
+		vid_dev->ve.pipe = NULL;
+	}
+
+	mutex_unlock(&vid_dev->lock);
+}
+
+static const struct v4l2_subdev_internal_ops vid_dev_subdev_internal_ops = {
+	.registered = vid_dev_subdev_registered,
+	.unregistered = vid_dev_subdev_unregistered,
+};
+
+static const struct v4l2_subdev_core_ops vid_dev_subdev_core_ops = {
+	.s_power = vid_dev_subdev_s_power,
+};
+
+static struct v4l2_subdev_ops vid_dev_subdev_ops = {
+	.core = &vid_dev_subdev_core_ops,
+};
+
+static int vid_dev_create_capture_subdev(struct video_device_dev *vid_dev)
+{
+	struct v4l2_subdev *sd = &vid_dev->subdev;
+	int ret;
+
+	v4l2_subdev_init(sd, &vid_dev_subdev_ops);
+	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	snprintf(sd->name, sizeof(sd->name), "Capture device");
+
+	vid_dev->subdev_pads[VIDEO_DEV_SD_PAD_SINK_CSI].flags =
+		MEDIA_PAD_FL_SOURCE;
+	vid_dev->subdev_pads[VIDEO_DEV_SD_PAD_SOURCE_DMA].flags =
+		MEDIA_PAD_FL_SINK;
+	ret =
+	    media_entity_pads_init(&sd->entity, VIDEO_DEV_SD_PADS_NUM,
+				   vid_dev->subdev_pads);
+	if (ret)
+		return ret;
+
+	sd->internal_ops = &vid_dev_subdev_internal_ops;
+	sd->entity.ops = &vid_dev_subdev_media_ops;
+	sd->owner = THIS_MODULE;
+	v4l2_set_subdevdata(sd, vid_dev);
+
+	return 0;
+}
+
+static void vid_dev_unregister_subdev(struct video_device_dev *vid_dev)
+{
+	struct v4l2_subdev *sd = &vid_dev->subdev;
+
+	v4l2_device_unregister_subdev(sd);
+	media_entity_cleanup(&sd->entity);
+	v4l2_set_subdevdata(sd, NULL);
+}
+
+static const struct of_device_id vid_dev_of_match[];
+
+static int vid_dev_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	const struct of_device_id *of_id;
+	int ret = 0;
+	struct video_device_dev *vid_dev;
+
+	dev_info(dev, "Installing IPK Video Device module\n");
+
+	if (!dev->of_node)
+		return -ENODEV;
+
+	vid_dev = devm_kzalloc(dev, sizeof(*vid_dev), GFP_KERNEL);
+	if (!vid_dev)
+		return -ENOMEM;
+
+	of_id = of_match_node(vid_dev_of_match, dev->of_node);
+	if (WARN_ON(of_id == NULL))
+		return -EINVAL;
+
+	vid_dev->pdev = pdev;
+
+	spin_lock_init(&vid_dev->slock);
+	mutex_init(&vid_dev->lock);
+
+	dev_info(&pdev->dev, "Requesting DMA\n");
+	vid_dev->dma = dma_request_slave_channel(&pdev->dev, "vdma0");
+	if (vid_dev->dma == NULL) {
+		dev_err(&pdev->dev, "no VDMA channel found\n");
+		ret = -ENODEV;
+		goto end;
+	}
+
+	ret = vid_dev_create_capture_subdev(vid_dev);
+	if (ret)
+		goto end;
+
+	platform_set_drvdata(pdev, vid_dev);
+
+	dev_info(dev, "Video Device registered successfully\n");
+	return 0;
+end:
+	dev_err(dev, "Video Device not registered!!\n");
+	return ret;
+}
+
+static int vid_dev_remove(struct platform_device *pdev)
+{
+	struct video_device_dev *dev = platform_get_drvdata(pdev);
+
+	vid_dev_unregister_subdev(dev);
+	dev_info(&pdev->dev, "Driver removed\n");
+
+	return 0;
+}
+
+static const struct of_device_id vid_dev_of_match[] = {
+	{.compatible = "snps,video-device"},
+	{}
+};
+
+MODULE_DEVICE_TABLE(of, vid_dev_of_match);
+
+static struct platform_driver __refdata vid_dev_pdrv = {
+	.remove = vid_dev_remove,
+	.probe = vid_dev_probe,
+	.driver = {
+		   .name = VIDEO_DEVICE_NAME,
+		   .owner = THIS_MODULE,
+		   .of_match_table = vid_dev_of_match,
+		   },
+};
+
+module_platform_driver(vid_dev_pdrv);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ramiro Oliveira <roliveir@synopsys.com>");
+MODULE_DESCRIPTION("Driver for configuring DMA and Video Device");
diff --git a/drivers/media/platform/dwc/video_device.h b/drivers/media/platform/dwc/video_device.h
new file mode 100644
index 0000000..e828d4b
--- /dev/null
+++ b/drivers/media/platform/dwc/video_device.h
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef VIDEO_DEVICE_H_
+#define VIDEO_DEVICE_H_
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/of_irq.h>
+#include <linux/delay.h>
+#include <linux/list.h>
+#include <linux/wait.h>
+#include <linux/string.h>
+#include <linux/videodev2.h>
+#include <linux/dma/xilinx_dma.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-common.h>
+#include <media/videobuf2-vmalloc.h>
+#include <media/media-entity.h>
+#include <linux/io.h>
+
+#include "plat_ipk_video.h"
+
+#define N_BUFFERS 3
+
+#define VIDEO_DEVICE_NAME	"video-device"
+
+#define FUNC_NAME __func__
+
+struct rx_buffer {
+	/** @short Buffer for video frames */
+	struct vb2_v4l2_buffer vb;
+	struct list_head list;
+
+	dma_addr_t dma_addr;
+	void *cpu_addr;
+};
+
+struct dmaqueue {
+	struct list_head active;
+	wait_queue_head_t wq;
+};
+
+/**
+ * @short Structure to embed device driver information
+ */
+struct video_device_dev {
+	struct platform_device *pdev;
+	struct v4l2_device *v4l2_dev;
+	struct v4l2_subdev subdev;
+	struct media_pad vd_pad;
+	struct media_pad subdev_pads[VIDEO_DEV_SD_PADS_NUM];
+	struct mutex lock;
+	spinlock_t slock;
+	struct plat_ipk_video_entity ve;
+	struct v4l2_format format;
+	struct v4l2_pix_format pix_format;
+	const struct plat_ipk_fmt *fmt;
+	unsigned long *alloc_ctx;
+
+	/* Buffer and DMA */
+	struct vb2_queue vb_queue;
+	int idx;
+	int last_idx;
+	struct dmaqueue vidq;
+	struct rx_buffer dma_buf[N_BUFFERS];
+	struct dma_chan *dma;
+	struct dma_interleaved_template xt;
+	struct data_chunk sgl[1];
+};
+
+/**
+ * @short Defines to simplify the code reading
+ */
+
+#define pixel_format(dev)	\
+	dev->format.fmt.pix.pixelformat
+#define bytes_per_line(dev)	\
+	dev->format.fmt.pix.bytesperline
+#define width(dev)		\
+	dev->format.fmt.pix.width
+#define height(dev)		\
+	dev->format.fmt.pix.height
+#define size_image(dev)		\
+	dev->format.fmt.pix.sizeimage
+
+const struct plat_ipk_fmt *vid_dev_find_format(struct v4l2_format *f,
+					       int index);
+
+#endif				/* VIDEO_DEVICE_H_ */
-- 
2.10.2

Re: [PATCH 2/2] Add basic support for DW CSI-2 Host IPK

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 5550 bytes --]

Hi Ramiro,

[auto build test WARNING on linuxtv-media/master]
[also build test WARNING on v4.9-rc5]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Ramiro-Oliveira/Add-support-for-the-DW-IP-Prototyping-Kits-for-MIPI-CSI-2-Host/20161115-014759
base:   git://linuxtv.org/media_tree.git master
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 6.2.0
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=ia64 

All warnings (new ones prefixed by >>):

   In file included from include/linux/kernel.h:13:0,
                    from include/linux/list.h:8,
                    from include/linux/module.h:9,
                    from drivers/media/platform/dwc/dw_mipi_csi.h:12,
                    from drivers/media/platform/dwc/dw_mipi_csi.c:14:
   drivers/media/platform/dwc/dw_mipi_csi.c: In function 'dw_mipi_csi_irq1':
>> drivers/media/platform/dwc/dw_mipi_csi.c:437:9: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
            (uint32_t) dev->base_address, ind_status);
            ^
   include/linux/printk.h:398:17: note: in definition of macro 'printk_ratelimited'
      printk(fmt, ##__VA_ARGS__);    \
                    ^~~~~~~~~~~
>> drivers/media/platform/dwc/dw_mipi_csi.c:436:3: note: in expansion of macro 'pr_info_ratelimited'
      pr_info_ratelimited("%08X CSI INT PHY FATAL: %08X\n",
      ^~~~~~~~~~~~~~~~~~~
   drivers/media/platform/dwc/dw_mipi_csi.c:443:9: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
            (uint32_t) dev->base_address, ind_status);
            ^
   include/linux/printk.h:398:17: note: in definition of macro 'printk_ratelimited'
      printk(fmt, ##__VA_ARGS__);    \
                    ^~~~~~~~~~~
   drivers/media/platform/dwc/dw_mipi_csi.c:442:3: note: in expansion of macro 'pr_info_ratelimited'
      pr_info_ratelimited("%08X CSI INT PKT FATAL: %08X\n",
      ^~~~~~~~~~~~~~~~~~~
   drivers/media/platform/dwc/dw_mipi_csi.c:449:9: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
            (uint32_t) dev->base_address, ind_status);
            ^
   include/linux/printk.h:398:17: note: in definition of macro 'printk_ratelimited'
      printk(fmt, ##__VA_ARGS__);    \
                    ^~~~~~~~~~~
   drivers/media/platform/dwc/dw_mipi_csi.c:448:3: note: in expansion of macro 'pr_info_ratelimited'
      pr_info_ratelimited("%08X CSI INT FRAME FATAL: %08X\n",
      ^~~~~~~~~~~~~~~~~~~
   drivers/media/platform/dwc/dw_mipi_csi.c:455:9: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
            (uint32_t) dev->base_address, ind_status);
            ^
   include/linux/printk.h:398:17: note: in definition of macro 'printk_ratelimited'
      printk(fmt, ##__VA_ARGS__);    \
                    ^~~~~~~~~~~
   drivers/media/platform/dwc/dw_mipi_csi.c:454:3: note: in expansion of macro 'pr_info_ratelimited'
      pr_info_ratelimited("%08X CSI INT PHY: %08X\n",
      ^~~~~~~~~~~~~~~~~~~
   drivers/media/platform/dwc/dw_mipi_csi.c:461:9: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
            (uint32_t) dev->base_address, ind_status);
            ^
   include/linux/printk.h:398:17: note: in definition of macro 'printk_ratelimited'
      printk(fmt, ##__VA_ARGS__);    \
                    ^~~~~~~~~~~
   drivers/media/platform/dwc/dw_mipi_csi.c:460:3: note: in expansion of macro 'pr_info_ratelimited'
      pr_info_ratelimited("%08X CSI INT PKT: %08X\n",
      ^~~~~~~~~~~~~~~~~~~
   drivers/media/platform/dwc/dw_mipi_csi.c:467:9: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
            (uint32_t) dev->base_address, ind_status);
            ^
   include/linux/printk.h:398:17: note: in definition of macro 'printk_ratelimited'
      printk(fmt, ##__VA_ARGS__);    \
                    ^~~~~~~~~~~
   drivers/media/platform/dwc/dw_mipi_csi.c:466:3: note: in expansion of macro 'pr_info_ratelimited'
      pr_info_ratelimited("%08X CSI INT LINE: %08X\n",
      ^~~~~~~~~~~~~~~~~~~
   drivers/media/platform/dwc/dw_mipi_csi.c:473:9: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
            (uint32_t) dev->base_address, ind_status);
            ^
   include/linux/printk.h:398:17: note: in definition of macro 'printk_ratelimited'
      printk(fmt, ##__VA_ARGS__);    \
                    ^~~~~~~~~~~
   drivers/media/platform/dwc/dw_mipi_csi.c:472:3: note: in expansion of macro 'pr_info_ratelimited'
      pr_info_ratelimited("%08X CSI INT IPI: %08X\n",
      ^~~~~~~~~~~~~~~~~~~

vim +437 drivers/media/platform/dwc/dw_mipi_csi.c

   430	
   431		int_status = dw_mipi_csi_read(dev, R_CSI2_INTERRUPT);
   432		spin_lock_irqsave(&dev->slock, flags);
   433	
   434		if (int_status & CSI2_INT_PHY_FATAL) {
   435			ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_PHY_FATAL);
 > 436			pr_info_ratelimited("%08X CSI INT PHY FATAL: %08X\n",
 > 437					    (uint32_t) dev->base_address, ind_status);
   438		}
   439	
   440		if (int_status & CSI2_INT_PKT_FATAL) {

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 45123 bytes --]

Re: [PATCH 2/2] Add basic support for DW CSI-2 Host IPK

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 1991 bytes --]

Hi Ramiro,

[auto build test ERROR on linuxtv-media/master]
[also build test ERROR on v4.9-rc5 next-20161114]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Ramiro-Oliveira/Add-support-for-the-DW-IP-Prototyping-Kits-for-MIPI-CSI-2-Host/20161115-014759
base:   git://linuxtv.org/media_tree.git master
config: i386-allmodconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/media/platform/dwc/dw_mipi_csi.c: In function 'mipi_csi_probe':
>> drivers/media/platform/dwc/dw_mipi_csi.c:597:8: error: implicit declaration of function 'devm_request_irq' [-Werror=implicit-function-declaration]
     ret = devm_request_irq(dev, mipi_csi->ctrl_irq_number,
           ^~~~~~~~~~~~~~~~
>> drivers/media/platform/dwc/dw_mipi_csi.c:598:29: error: 'IRQF_SHARED' undeclared (first use in this function)
              dw_mipi_csi_irq1, IRQF_SHARED,
                                ^~~~~~~~~~~
   drivers/media/platform/dwc/dw_mipi_csi.c:598:29: note: each undeclared identifier is reported only once for each function it appears in
   cc1: some warnings being treated as errors

vim +/devm_request_irq +597 drivers/media/platform/dwc/dw_mipi_csi.c

   591		mipi_csi->ctrl_irq_number = platform_get_irq(pdev, 0);
   592		if (mipi_csi->ctrl_irq_number <= 0) {
   593			dev_err(dev, "IRQ number not set.\n");
   594			return mipi_csi->ctrl_irq_number;
   595		}
   596	
 > 597		ret = devm_request_irq(dev, mipi_csi->ctrl_irq_number,
 > 598				       dw_mipi_csi_irq1, IRQF_SHARED,
   599				       dev_name(dev), mipi_csi);
   600		if (ret) {
   601			dev_err(dev, "IRQ failed\n");

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 56871 bytes --]

Re: [PATCH 2/2] Add basic support for DW CSI-2 Host IPK

[Sakari Ailus]

Hi Ramiro,

Thank you for the patchset. Please see my comments below.

If you've got a CSI-2 receiver, why do you use the DV timing presets? What
do you use those for?

On Mon, Nov 14, 2016 at 02:20:23PM +0000, Ramiro Oliveira wrote:
> Add support for basic configuration of the DW CSI-2 Host IPK
> 
> Signed-off-by: Ramiro Oliveira <roliveir@synopsys.com>
> ---
>  MAINTAINERS                                 |   7 +
>  drivers/media/platform/Kconfig              |   1 +
>  drivers/media/platform/Makefile             |   2 +
>  drivers/media/platform/dwc/Kconfig          |  36 ++
>  drivers/media/platform/dwc/Makefile         |   3 +
>  drivers/media/platform/dwc/dw_mipi_csi.c    | 687 +++++++++++++++++++++++
>  drivers/media/platform/dwc/dw_mipi_csi.h    | 179 ++++++
>  drivers/media/platform/dwc/plat_ipk.c       | 835 ++++++++++++++++++++++++++++
>  drivers/media/platform/dwc/plat_ipk.h       |  97 ++++
>  drivers/media/platform/dwc/plat_ipk_video.h |  97 ++++
>  drivers/media/platform/dwc/video_device.c   | 741 ++++++++++++++++++++++++
>  drivers/media/platform/dwc/video_device.h   | 101 ++++
>  12 files changed, 2786 insertions(+)
>  create mode 100644 drivers/media/platform/dwc/Kconfig
>  create mode 100644 drivers/media/platform/dwc/Makefile
>  create mode 100644 drivers/media/platform/dwc/dw_mipi_csi.c
>  create mode 100644 drivers/media/platform/dwc/dw_mipi_csi.h
>  create mode 100644 drivers/media/platform/dwc/plat_ipk.c
>  create mode 100644 drivers/media/platform/dwc/plat_ipk.h
>  create mode 100644 drivers/media/platform/dwc/plat_ipk_video.h
>  create mode 100644 drivers/media/platform/dwc/video_device.c
>  create mode 100644 drivers/media/platform/dwc/video_device.h
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 6a71422..f54dfd8 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -10618,6 +10618,13 @@ S:	Maintained
>  F:	drivers/staging/media/st-cec/
>  F:	Documentation/devicetree/bindings/media/stih-cec.txt
>  
> +SYNOPSYS DESIGNWARE CSI-2 HOST IPK DRIVER
> +M:	Ramiro Oliveira <roliveir@synopsys.com>
> +L:	linux-media@vger.kernel.org
> +T:	git git://linuxtv.org/media_tree.git
> +S:	Maintained
> +F:	drivers/media/platform/dwc/
> +
>  SYNOPSYS DESIGNWARE DMAC DRIVER
>  M:	Viresh Kumar <vireshk@kernel.org>
>  M:	Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index 754edbf1..6fef760f 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -120,6 +120,7 @@ source "drivers/media/platform/am437x/Kconfig"
>  source "drivers/media/platform/xilinx/Kconfig"
>  source "drivers/media/platform/rcar-vin/Kconfig"
>  source "drivers/media/platform/atmel/Kconfig"
> +source "drivers/media/platform/dwc/Kconfig"
>  
>  config VIDEO_TI_CAL
>  	tristate "TI CAL (Camera Adaptation Layer) driver"
> diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
> index f842933..623f5d2 100644
> --- a/drivers/media/platform/Makefile
> +++ b/drivers/media/platform/Makefile
> @@ -61,6 +61,8 @@ obj-$(CONFIG_VIDEO_RCAR_VIN)		+= rcar-vin/
>  
>  obj-$(CONFIG_VIDEO_ATMEL_ISC)		+= atmel/
>  
> +obj-$(CONFIG_VIDEO_DWC)			+= dwc/
> +
>  ccflags-y += -I$(srctree)/drivers/media/i2c
>  
>  obj-$(CONFIG_VIDEO_MEDIATEK_VPU)	+= mtk-vpu/
> diff --git a/drivers/media/platform/dwc/Kconfig b/drivers/media/platform/dwc/Kconfig
> new file mode 100644
> index 0000000..fb8533b
> --- /dev/null
> +++ b/drivers/media/platform/dwc/Kconfig
> @@ -0,0 +1,36 @@
> +config VIDEO_DWC
> +	bool "Designware Cores CSI-2 IPK (EXPERIMENTAL)"
> +	depends on VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API && OF && HAS_DMA
> +	help
> +	  Say Y here to enable support for the DesignWare Cores CSI-2 Host IP
> +	  Prototyping Kit.
> +
> +if VIDEO_DWC
> +config DWC_PLATFORM
> +	tristate "SNPS DWC MIPI CSI2 Host"
> +	depends on VIDEO_DWC
> +	help
> +	  This is the V4L2 plaftorm driver driver for the DWC CSI-2 HOST IPK
> +
> +	  To compile this driver as a module, choose M here
> +
> +
> +config DWC_MIPI_CSI2_HOST
> +	tristate "SNPS DWC MIPI CSI2 Host"
> +	select GENERIC_PHY
> +	depends on VIDEO_DWC
> +	help
> +	  This is a V4L2 driver for SNPS DWC MIPI-CSI2
> +
> +	  To compile this driver as a module, choose M here
> +
> +config DWC_VIDEO_DEVICE
> +	tristate "DWC VIDEO DEVICE"
> +	select VIDEOBUF2_VMALLOC
> +	select VIDEOBUF2_DMA_CONTIG
> +	depends on VIDEO_DWC
> +	help
> +	  This is a V4L2 driver for SNPS Video device
> +	  To compile this driver as a module, choose M here
> +
> +endif # VIDEO_DWC
> diff --git a/drivers/media/platform/dwc/Makefile b/drivers/media/platform/dwc/Makefile
> new file mode 100644
> index 0000000..75c74b7
> --- /dev/null
> +++ b/drivers/media/platform/dwc/Makefile
> @@ -0,0 +1,3 @@
> +obj-$(CONFIG_DWC_PLATFORM)		+= plat_ipk.o
> +obj-$(CONFIG_DWC_MIPI_CSI2_HOST)	+= dw_mipi_csi.o
> +obj-$(CONFIG_DWC_VIDEO_DEVICE)		+= video_device.o
> diff --git a/drivers/media/platform/dwc/dw_mipi_csi.c b/drivers/media/platform/dwc/dw_mipi_csi.c
> new file mode 100644
> index 0000000..1337a5e
> --- /dev/null
> +++ b/drivers/media/platform/dwc/dw_mipi_csi.c
> @@ -0,0 +1,687 @@
> +/*
> + * DWC MIPI CSI-2 Host device driver
> + *
> + * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
> + * Author: Ramiro Oliveira <ramiro.oliveira@synopsys.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published
> + * by the Free Software Foundation, either version 2 of the License,
> + * or (at your option) any later version.
> + */
> +
> +
> +#include "dw_mipi_csi.h"
> +
> +/** @short Driver args: debug */
> +static unsigned int debug;
> +module_param(debug, uint, 0644);
> +MODULE_PARM_DESC(debug, "Activates debug info");

There should be no need for module specific debug parameters. Please use
dynamic debug instead.

> +
> +/*
> + * Basic IO read and write operations
> + */
> +
> +/**
> + * @short Video formats supported by the MIPI CSI-2
> + */
> +static const struct mipi_fmt dw_mipi_csi_formats[] = {
> +	{
> +	 .name = "RAW BGGR 8",

Do you use the name field for something? If not, I'd suggest to drop it.

> +	 .code = MEDIA_BUS_FMT_SBGGR8_1X8,
> +	 .depth = 8,
> +	 },
> +	{
> +	 .name = "RAW10",
> +	 .code = MEDIA_BUS_FMT_SBGGR10_2X8_PADHI_BE,
> +	 .depth = 10,
> +	 },
> +	{
> +	 .name = "RGB565",
> +	 .code = MEDIA_BUS_FMT_RGB565_2X8_BE,
> +	 .depth = 16,
> +	 },
> +	{
> +	 .name = "BGR565",
> +	 .code = MEDIA_BUS_FMT_RGB565_2X8_LE,
> +	 .depth = 16,
> +	 },
> +	{
> +	 .name = "RGB888",
> +	 .code = MEDIA_BUS_FMT_RGB888_2X12_LE,
> +	 .depth = 24,
> +	 },
> +	{
> +	 .name = "BGR888",
> +	 .code = MEDIA_BUS_FMT_RGB888_2X12_BE,
> +	 .depth = 24,
> +	 },
> +};
> +
> +static struct mipi_csi_dev *
> +sd_to_mipi_csi_dev(struct v4l2_subdev *sdev)
> +{
> +	return container_of(sdev, struct mipi_csi_dev, sd);
> +}
> +
> +void
> +dw_mipi_csi_write(struct mipi_csi_dev *dev,
> +		  unsigned int address, unsigned int data)
> +{
> +	iowrite32(data, dev->base_address + address);
> +}
> +
> +u32
> +dw_mipi_csi_read(struct mipi_csi_dev *dev, unsigned long address)
> +{
> +	return ioread32(dev->base_address + address);
> +}
> +
> +void
> +dw_mipi_csi_write_part(struct mipi_csi_dev *dev,
> +		       unsigned long address, unsigned long data,
> +		       unsigned char shift, unsigned char width)
> +{
> +	u32 mask = (1 << width) - 1;
> +	u32 temp = dw_mipi_csi_read(dev, address);
> +
> +	temp &= ~(mask << shift);
> +	temp |= (data & mask) << shift;
> +	dw_mipi_csi_write(dev, address, temp);
> +}
> +
> +static const struct mipi_fmt *
> +find_dw_mipi_csi_format(struct v4l2_mbus_framefmt *mf)
> +{
> +	int i;

unsigned int

> +
> +	for (i = 0; i < ARRAY_SIZE(dw_mipi_csi_formats); i++)
> +		if (mf->code == dw_mipi_csi_formats[i].code)
> +			return &dw_mipi_csi_formats[i];
> +	return NULL;
> +}
> +
> +int
> +enable_video_output(struct mipi_csi_dev *dev)
> +{
> +	return 0;
> +}

This one is unused.

> +
> +int
> +disable_video_output(struct mipi_csi_dev *dev)
> +{
> +	phy_power_off(dev->phy);
> +	return 0;
> +}

This one as well.

> +
> +static void
> +dw_mipi_csi_reset(struct mipi_csi_dev *dev)
> +{
> +	dw_mipi_csi_write(dev, R_CSI2_CTRL_RESETN, 0);
> +	/* mdelay(1); */
> +	dw_mipi_csi_write(dev, R_CSI2_CTRL_RESETN, 1);
> +}
> +
> +static int
> +dw_mipi_csi_mask_irq_power_off(struct mipi_csi_dev *dev)
> +{
> +	/* set only one lane (lane 0) as active (ON) */
> +	dw_mipi_csi_write(dev, R_CSI2_N_LANES, 0);
> +
> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PHY_FATAL, 0);
> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PKT_FATAL, 0);
> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_FRAME_FATAL, 0);
> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PHY, 0);
> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PKT, 0);
> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_LINE, 0);
> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_IPI, 0);
> +
> +	dw_mipi_csi_write(dev, R_CSI2_CTRL_RESETN, 0);
> +
> +	return 0;
> +
> +}
> +
> +static int
> +dw_mipi_csi_hw_stdby(struct mipi_csi_dev *dev)
> +{
> +	/* set only one lane (lane 0) as active (ON) */
> +	dw_mipi_csi_reset(dev);
> +
> +	dw_mipi_csi_write(dev, R_CSI2_N_LANES, 0);
> +
> +	phy_init(dev->phy);
> +
> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PHY_FATAL, 0xFFFFFFFF);
> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PKT_FATAL, 0xFFFFFFFF);
> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_FRAME_FATAL, 0xFFFFFFFF);
> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PHY, 0xFFFFFFFF);
> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PKT, 0xFFFFFFFF);
> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_LINE, 0xFFFFFFFF);
> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_IPI, 0xFFFFFFFF);
> +
> +	return 0;
> +
> +}
> +
> +void

Shouldn't this be static? The same applies to many other symbols as well.

> +dw_mipi_csi_set_ipi_fmt(struct mipi_csi_dev *dev)
> +{
> +	switch (dev->fmt->code) {
> +	case MEDIA_BUS_FMT_RGB565_2X8_BE:
> +	case MEDIA_BUS_FMT_RGB565_2X8_LE:
> +		dw_mipi_csi_write(dev, R_CSI2_IPI_DATA_TYPE, CSI_2_RGB565);
> +		v4l2_dbg(1, debug, &dev->sd, "DT: RGB 565");
> +		break;
> +
> +	case MEDIA_BUS_FMT_RGB888_2X12_LE:
> +	case MEDIA_BUS_FMT_RGB888_2X12_BE:
> +		dw_mipi_csi_write(dev, R_CSI2_IPI_DATA_TYPE, CSI_2_RGB888);
> +		v4l2_dbg(1, debug, &dev->sd, "DT: RGB 888");
> +		break;
> +	case MEDIA_BUS_FMT_SBGGR10_2X8_PADHI_BE:
> +		dw_mipi_csi_write(dev, R_CSI2_IPI_DATA_TYPE, CSI_2_RAW10);
> +		v4l2_dbg(1, debug, &dev->sd, "DT: RAW 10");
> +		break;
> +	case MEDIA_BUS_FMT_SBGGR8_1X8:
> +		dw_mipi_csi_write(dev, R_CSI2_IPI_DATA_TYPE, CSI_2_RAW8);
> +		v4l2_dbg(1, debug, &dev->sd, "DT: RAW 8");
> +		break;
> +	default:
> +		dw_mipi_csi_write(dev, R_CSI2_IPI_DATA_TYPE, CSI_2_RGB565);
> +		v4l2_dbg(1, debug, &dev->sd, "Error");
> +		break;
> +	}
> +}
> +
> +void
> +__dw_mipi_csi_fill_timings(struct mipi_csi_dev *dev,
> +			   const struct v4l2_bt_timings *bt)
> +{
> +
> +	if (bt == NULL)
> +		return;
> +
> +	dev->hw.hsa = bt->hsync;
> +	dev->hw.hbp = bt->hbackporch;
> +	dev->hw.hsd = bt->hsync;
> +	dev->hw.htotal = bt->height + bt->vfrontporch +
> +	    bt->vsync + bt->vbackporch;
> +	dev->hw.vsa = bt->vsync;
> +	dev->hw.vbp = bt->vbackporch;
> +	dev->hw.vfp = bt->vfrontporch;
> +	dev->hw.vactive = bt->height;
> +}

There seem to be quite a few unused functions here.

> +
> +void
> +dw_mipi_csi_start(struct mipi_csi_dev *dev)
> +{
> +	const struct v4l2_bt_timings *bt = &v4l2_dv_timings_presets[0].bt;
> +
> +	__dw_mipi_csi_fill_timings(dev, bt);
> +
> +	dw_mipi_csi_write(dev, R_CSI2_N_LANES, (dev->hw.num_lanes - 1));
> +	v4l2_dbg(1, debug, &dev->sd, "N Lanes: %d\n", dev->hw.num_lanes);
> +
> +	/*IPI Related Configuration */
> +	if ((dev->hw.output_type == IPI_OUT)
> +	    || (dev->hw.output_type == BOTH_OUT)) {
> +
> +		dw_mipi_csi_write_part(dev, R_CSI2_IPI_MODE, dev->hw.ipi_mode,
> +				       0, 1);
> +		v4l2_dbg(1, debug, &dev->sd, "IPI MODE: %d\n",
> +			 dev->hw.ipi_mode);
> +
> +		dw_mipi_csi_write_part(dev, R_CSI2_IPI_MODE,
> +				       dev->hw.ipi_color_mode, 8, 1);
> +		v4l2_dbg(1, debug, &dev->sd, "Color Mode: %d\n",
> +			 dev->hw.ipi_color_mode);
> +
> +		dw_mipi_csi_write(dev, R_CSI2_IPI_VCID, dev->hw.virtual_ch);
> +		v4l2_dbg(1, debug, &dev->sd, "Virtual Channel: %d\n",
> +			 dev->hw.virtual_ch);
> +
> +		dw_mipi_csi_write_part(dev, R_CSI2_IPI_MEM_FLUSH,
> +				       dev->hw.ipi_auto_flush, 8, 1);
> +		v4l2_dbg(1, debug, &dev->sd, "Auto-flush: %d\n",
> +			 dev->hw.ipi_auto_flush);
> +
> +		dw_mipi_csi_write(dev, R_CSI2_IPI_HSA_TIME, dev->hw.hsa);
> +		v4l2_dbg(1, debug, &dev->sd, "HSA: %d\n", dev->hw.hsa);
> +
> +		dw_mipi_csi_write(dev, R_CSI2_IPI_HBP_TIME, dev->hw.hbp);
> +		v4l2_dbg(1, debug, &dev->sd, "HBP: %d\n", dev->hw.hbp);
> +
> +		dw_mipi_csi_write(dev, R_CSI2_IPI_HSD_TIME, dev->hw.hsd);
> +		v4l2_dbg(1, debug, &dev->sd, "HSD: %d\n", dev->hw.hsd);
> +
> +		if (dev->hw.ipi_mode == AUTO_TIMING) {
> +			dw_mipi_csi_write(dev, R_CSI2_IPI_HLINE_TIME,
> +					  dev->hw.htotal);
> +			v4l2_dbg(1, debug, &dev->sd, "H total: %d\n",
> +				 dev->hw.htotal);
> +
> +			dw_mipi_csi_write(dev, R_CSI2_IPI_VSA_LINES,
> +					  dev->hw.vsa);
> +			v4l2_dbg(1, debug, &dev->sd, "VSA: %d\n", dev->hw.vsa);
> +
> +			dw_mipi_csi_write(dev, R_CSI2_IPI_VBP_LINES,
> +					  dev->hw.vbp);
> +			v4l2_dbg(1, debug, &dev->sd, "VBP: %d\n", dev->hw.vbp);
> +
> +			dw_mipi_csi_write(dev, R_CSI2_IPI_VFP_LINES,
> +					  dev->hw.vfp);
> +			v4l2_dbg(1, debug, &dev->sd, "VFP: %d\n", dev->hw.vfp);
> +
> +			dw_mipi_csi_write(dev, R_CSI2_IPI_VACTIVE_LINES,
> +					  dev->hw.vactive);
> +			v4l2_dbg(1, debug, &dev->sd, "V Active: %d\n",
> +				 dev->hw.vactive);
> +		}
> +	}
> +
> +	phy_power_on(dev->phy);
> +}
> +
> +static int
> +dw_mipi_csi_enum_mbus_code(struct v4l2_subdev *sd,
> +			   struct v4l2_subdev_pad_config *cfg,
> +			   struct v4l2_subdev_mbus_code_enum *code)
> +{
> +	if (code->index >= ARRAY_SIZE(dw_mipi_csi_formats))
> +		return -EINVAL;
> +
> +	code->code = dw_mipi_csi_formats[code->index].code;
> +	return 0;
> +}
> +
> +static struct mipi_fmt const *
> +dw_mipi_csi_try_format(struct v4l2_mbus_framefmt *mf)
> +{
> +	struct mipi_fmt const *fmt;
> +
> +	fmt = find_dw_mipi_csi_format(mf);
> +	if (fmt == NULL)
> +		fmt = &dw_mipi_csi_formats[0];
> +
> +	mf->code = fmt->code;
> +	return fmt;
> +}
> +
> +static struct v4l2_mbus_framefmt *
> +__dw_mipi_csi_get_format(struct mipi_csi_dev *dev,
> +			 struct v4l2_subdev_pad_config *cfg,
> +			 enum v4l2_subdev_format_whence which)
> +{
> +	if (which == V4L2_SUBDEV_FORMAT_TRY)
> +		return cfg ? v4l2_subdev_get_try_format(&dev->sd, cfg,
> +							0) : NULL;
> +
> +	return &dev->format;
> +}
> +
> +static int
> +dw_mipi_csi_set_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg,
> +		    struct v4l2_subdev_format *fmt)
> +{
> +	struct mipi_csi_dev *dev = sd_to_mipi_csi_dev(sd);
> +	struct mipi_fmt const *dev_fmt;
> +	struct v4l2_mbus_framefmt *mf;
> +	int i = 0;

unsigned int

> +	const struct v4l2_bt_timings *bt_r = &v4l2_dv_timings_presets[0].bt;
> +
> +	mf = __dw_mipi_csi_get_format(dev, cfg, fmt->which);
> +
> +	dev_fmt = dw_mipi_csi_try_format(&fmt->format);
> +	if (dev_fmt) {
> +		*mf = fmt->format;
> +		if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE)
> +			dev->fmt = dev_fmt;
> +		dw_mipi_csi_set_ipi_fmt(dev);
> +	}
> +	while (v4l2_dv_timings_presets[i].bt.width) {
> +		const struct v4l2_bt_timings *bt =
> +		    &v4l2_dv_timings_presets[i].bt;
> +		if (mf->width == bt->width && mf->height == bt->width) {
> +			__dw_mipi_csi_fill_timings(dev, bt);
> +			return 0;
> +		}
> +		i++;
> +	}
> +
> +	__dw_mipi_csi_fill_timings(dev, bt_r);
> +	return 0;
> +
> +}
> +
> +static int
> +dw_mipi_csi_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg,
> +		    struct v4l2_subdev_format *fmt)
> +{
> +	struct mipi_csi_dev *dev = sd_to_mipi_csi_dev(sd);
> +	struct v4l2_mbus_framefmt *mf;
> +
> +	mf = __dw_mipi_csi_get_format(dev, cfg, fmt->which);
> +	if (!mf)
> +		return -EINVAL;
> +
> +	mutex_lock(&dev->lock);
> +	fmt->format = *mf;
> +	mutex_unlock(&dev->lock);
> +	return 0;
> +}
> +
> +static int
> +dw_mipi_csi_s_power(struct v4l2_subdev *sd, int on)
> +{
> +	struct mipi_csi_dev *dev = sd_to_mipi_csi_dev(sd);
> +
> +	if (on) {
> +		dw_mipi_csi_hw_stdby(dev);
> +		dw_mipi_csi_start(dev);
> +	} else {
> +		dw_mipi_csi_mask_irq_power_off(dev);
> +	}
> +
> +	return 0;
> +}
> +
> +static int
> +dw_mipi_csi_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> +{
> +	struct v4l2_mbus_framefmt *format =
> +	    v4l2_subdev_get_try_format(sd, fh->pad, 0);
> +
> +	format->colorspace = V4L2_COLORSPACE_SRGB;
> +	format->code = dw_mipi_csi_formats[0].code;
> +	format->width = MIN_WIDTH;
> +	format->height = MIN_HEIGHT;
> +	format->field = V4L2_FIELD_NONE;
> +
> +	return 0;
> +}
> +
> +static const struct v4l2_subdev_internal_ops dw_mipi_csi_sd_internal_ops = {
> +	.open = dw_mipi_csi_open,
> +};
> +
> +static struct v4l2_subdev_core_ops dw_mipi_csi_core_ops = {
> +	.s_power = dw_mipi_csi_s_power,
> +};
> +
> +static struct v4l2_subdev_pad_ops dw_mipi_csi_pad_ops = {
> +	.enum_mbus_code = dw_mipi_csi_enum_mbus_code,
> +	.get_fmt = dw_mipi_csi_get_fmt,
> +	.set_fmt = dw_mipi_csi_set_fmt,
> +};
> +
> +static struct v4l2_subdev_ops dw_mipi_csi_subdev_ops = {
> +	.core = &dw_mipi_csi_core_ops,
> +	.pad = &dw_mipi_csi_pad_ops,
> +};
> +
> +static irqreturn_t
> +dw_mipi_csi_irq1(int irq, void *dev_id)
> +{
> +
> +	struct mipi_csi_dev *dev = dev_id;
> +	u32 int_status, ind_status;
> +	unsigned long flags;
> +
> +	int_status = dw_mipi_csi_read(dev, R_CSI2_INTERRUPT);
> +	spin_lock_irqsave(&dev->slock, flags);
> +
> +	if (int_status & CSI2_INT_PHY_FATAL) {
> +		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_PHY_FATAL);
> +		pr_info_ratelimited("%08X CSI INT PHY FATAL: %08X\n",
> +				    (uint32_t) dev->base_address, ind_status);

I don't think you should use pr_info() for interrupts. This is basically
debug information, isn't it?

> +	}
> +
> +	if (int_status & CSI2_INT_PKT_FATAL) {
> +		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_PKT_FATAL);
> +		pr_info_ratelimited("%08X CSI INT PKT FATAL: %08X\n",
> +				    (uint32_t) dev->base_address, ind_status);
> +	}
> +
> +	if (int_status & CSI2_INT_FRAME_FATAL) {
> +		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_FRAME_FATAL);
> +		pr_info_ratelimited("%08X CSI INT FRAME FATAL: %08X\n",
> +				    (uint32_t) dev->base_address, ind_status);
> +	}
> +
> +	if (int_status & CSI2_INT_PHY) {
> +		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_PHY);
> +		pr_info_ratelimited("%08X CSI INT PHY: %08X\n",
> +				    (uint32_t) dev->base_address, ind_status);
> +	}
> +
> +	if (int_status & CSI2_INT_PKT) {
> +		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_PKT);
> +		pr_info_ratelimited("%08X CSI INT PKT: %08X\n",
> +				    (uint32_t) dev->base_address, ind_status);
> +	}
> +
> +	if (int_status & CSI2_INT_LINE) {
> +		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_LINE);
> +		pr_info_ratelimited("%08X CSI INT LINE: %08X\n",
> +				    (uint32_t) dev->base_address, ind_status);
> +	}
> +
> +	if (int_status & CSI2_INT_IPI) {
> +		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_IPI);
> +		pr_info_ratelimited("%08X CSI INT IPI: %08X\n",
> +				    (uint32_t) dev->base_address, ind_status);
> +	}
> +	spin_unlock_irqrestore(&dev->slock, flags);
> +	return IRQ_HANDLED;
> +}
> +
> +static int
> +dw_mipi_csi_parse_dt(struct platform_device *pdev, struct mipi_csi_dev *dev)
> +{
> +	struct device_node *node = pdev->dev.of_node;
> +	int reg;
> +	int ret = 0;
> +
> +	/* Device tree information */
> +	ret = of_property_read_u32(node, "data-lanes", &dev->hw.num_lanes);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Couldn't read data-lanes\n");
> +		return ret;
> +	}
> +
> +	ret = of_property_read_u32(node, "output-type", &dev->hw.output_type);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Couldn't read output-type\n");
> +		return ret;
> +	}
> +
> +	ret = of_property_read_u32(node, "ipi-mode", &dev->hw.ipi_mode);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Couldn't read ipi-mode\n");
> +		return ret;
> +	}
> +
> +	ret =
> +	    of_property_read_u32(node, "ipi-auto-flush",
> +				 &dev->hw.ipi_auto_flush);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Couldn't read ipi-auto-flush\n");
> +		return ret;
> +	}
> +
> +	ret =
> +	    of_property_read_u32(node, "ipi-color-mode",
> +				 &dev->hw.ipi_color_mode);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Couldn't read ipi-color-mode\n");
> +		return ret;
> +	}
> +
> +	ret =
> +	    of_property_read_u32(node, "virtual-channel", &dev->hw.virtual_ch);

Is this some thing that should come from DT? Sure, we don't really have
proper support for virtual channels right now, but could you use zero for
now?

> +	if (ret) {
> +		dev_err(&pdev->dev, "Couldn't read virtual-channel\n");
> +		return ret;
> +	}
> +
> +	node = of_get_child_by_name(node, "port");
> +	if (!node)
> +		return -EINVAL;
> +
> +	ret = of_property_read_u32(node, "reg", &reg);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Couldn't read reg value\n");
> +		return ret;
> +	}
> +	dev->index = reg - 1;
> +
> +	if (dev->index >= CSI_MAX_ENTITIES)
> +		return -ENXIO;
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id dw_mipi_csi_of_match[];
> +
> +/**
> + * @short Initialization routine - Entry point of the driver
> + * @param[in] pdev pointer to the platform device structure
> + * @return 0 on success and a negative number on failure
> + * Refer to Linux errors.
> + */
> +static int mipi_csi_probe(struct platform_device *pdev)
> +{
> +	const struct of_device_id *of_id;
> +	struct device *dev = &pdev->dev;
> +	struct resource *res = NULL;
> +	struct mipi_csi_dev *mipi_csi;
> +	int ret = -ENOMEM;
> +
> +	dev_info(&pdev->dev, "Installing MIPI CSI-2 module\n");
> +
> +	dev_dbg(&pdev->dev, "Device registration\n");

At least one of these is redundant. I'd just remove both.

> +	mipi_csi = devm_kzalloc(dev, sizeof(*mipi_csi), GFP_KERNEL);
> +	if (!dev)
> +		return -ENOMEM;
> +
> +	mutex_init(&mipi_csi->lock);
> +	spin_lock_init(&mipi_csi->slock);
> +	mipi_csi->pdev = pdev;
> +
> +	of_id = of_match_node(dw_mipi_csi_of_match, dev->of_node);
> +	if (WARN_ON(of_id == NULL))
> +		return -EINVAL;
> +
> +	ret = dw_mipi_csi_parse_dt(pdev, mipi_csi);
> +	if (ret < 0)
> +		return ret;
> +
> +	dev_info(dev, "Request DPHY\n");
> +	mipi_csi->phy = devm_phy_get(dev, "csi2-dphy");
> +	if (IS_ERR(mipi_csi->phy))
> +		return PTR_ERR(mipi_csi->phy);

It'd be better to tell what's wrong when there's an error instead of
printing a series of messages even when all is well.

> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	mipi_csi->base_address = devm_ioremap_resource(dev, res);
> +
> +	if (IS_ERR(mipi_csi->base_address))
> +		return PTR_ERR(mipi_csi->base_address);
> +
> +	mipi_csi->ctrl_irq_number = platform_get_irq(pdev, 0);
> +	if (mipi_csi->ctrl_irq_number <= 0) {
> +		dev_err(dev, "IRQ number not set.\n");
> +		return mipi_csi->ctrl_irq_number;
> +	}
> +
> +	ret = devm_request_irq(dev, mipi_csi->ctrl_irq_number,
> +			       dw_mipi_csi_irq1, IRQF_SHARED,
> +			       dev_name(dev), mipi_csi);
> +	if (ret) {
> +		dev_err(dev, "IRQ failed\n");
> +		goto end;
> +	}
> +
> +	v4l2_subdev_init(&mipi_csi->sd, &dw_mipi_csi_subdev_ops);
> +	mipi_csi->sd.owner = THIS_MODULE;
> +	snprintf(mipi_csi->sd.name, sizeof(mipi_csi->sd.name), "%s.%d",
> +		 CSI_DEVICE_NAME, mipi_csi->index);
> +	mipi_csi->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> +	mipi_csi->fmt = &dw_mipi_csi_formats[0];
> +
> +	mipi_csi->format.code = dw_mipi_csi_formats[0].code;
> +	mipi_csi->format.width = MIN_WIDTH;
> +	mipi_csi->format.height = MIN_HEIGHT;
> +
> +	mipi_csi->pads[CSI_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
> +	mipi_csi->pads[CSI_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
> +	ret = media_entity_pads_init(&mipi_csi->sd.entity,
> +				     CSI_PADS_NUM, mipi_csi->pads);
> +
> +	if (ret < 0) {
> +		dev_err(dev, "Media Entity init failed\n");
> +		goto entity_cleanup;
> +	}
> +
> +	/* This allows to retrieve the platform device id by the host driver */
> +	v4l2_set_subdevdata(&mipi_csi->sd, pdev);
> +
> +	/* .. and a pointer to the subdev. */
> +	platform_set_drvdata(pdev, &mipi_csi->sd);
> +
> +	dw_mipi_csi_mask_irq_power_off(mipi_csi);
> +	dev_info(dev, "DW MIPI CSI-2 Host registered successfully\n");
> +	return 0;
> +
> +entity_cleanup:
> +	media_entity_cleanup(&mipi_csi->sd.entity);
> +end:
> +	return ret;
> +}
> +
> +/**
> + * @short Exit routine - Exit point of the driver
> + * @param[in] pdev pointer to the platform device structure
> + * @return 0 on success and a negative number on failure
> + * Refer to Linux errors.
> + */
> +static int mipi_csi_remove(struct platform_device *pdev)
> +{
> +	struct v4l2_subdev *sd = platform_get_drvdata(pdev);
> +	struct mipi_csi_dev *mipi_csi = sd_to_mipi_csi_dev(sd);
> +
> +	dev_dbg(&pdev->dev, "Removing MIPI CSI-2 module\n");
> +	media_entity_cleanup(&mipi_csi->sd.entity);
> +
> +	return 0;
> +}
> +
> +/**
> + * @short of_device_id structure
> + */
> +static const struct of_device_id dw_mipi_csi_of_match[] = {
> +	{
> +	 .compatible = "snps,dw-mipi-csi"},
> +	{ /* sentinel */ },
> +};
> +
> +MODULE_DEVICE_TABLE(of, dw_mipi_csi_of_match);
> +
> +/**
> + * @short Platform driver structure
> + */
> +static struct platform_driver __refdata dw_mipi_csi_pdrv = {
> +	.remove = mipi_csi_remove,
> +	.probe = mipi_csi_probe,
> +	.driver = {
> +		   .name = CSI_DEVICE_NAME,
> +		   .owner = THIS_MODULE,
> +		   .of_match_table = dw_mipi_csi_of_match,
> +		   },
> +};
> +
> +module_platform_driver(dw_mipi_csi_pdrv);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Ramiro Oliveira <roliveir@synopsys.com>");
> +MODULE_DESCRIPTION("Synopsys DW MIPI CSI-2 Host driver");
> diff --git a/drivers/media/platform/dwc/dw_mipi_csi.h b/drivers/media/platform/dwc/dw_mipi_csi.h
> new file mode 100644
> index 0000000..5e4c48c
> --- /dev/null
> +++ b/drivers/media/platform/dwc/dw_mipi_csi.h
> @@ -0,0 +1,179 @@
> +/*
> + * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef DW_MIPI_CSI_H_
> +#define DW_MIPI_CSI_H_
> +
> +#include <linux/module.h>
> +#include <linux/errno.h>
> +#include <linux/kernel.h>
> +#include <linux/types.h>
> +#include <linux/platform_device.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_graph.h>
> +#include <linux/delay.h>
> +#include <linux/wait.h>
> +#include <linux/string.h>
> +#include <linux/phy/phy.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-dv-timings.h>
> +#include <linux/videodev2.h>
> +#include <linux/io.h>

Please arrange alphabetically. Same for other files.

> +
> +#include "plat_ipk_video.h"
> +
> +#define CSI_DEVICE_NAME	"dw-mipi-csi"
> +
> +/** @short DWC MIPI CSI-2 register addresses*/
> +enum register_addresses {
> +	R_CSI2_VERSION = 0x00,
> +	R_CSI2_N_LANES = 0x04,
> +	R_CSI2_CTRL_RESETN = 0x08,
> +	R_CSI2_INTERRUPT = 0x0C,
> +	R_CSI2_DATA_IDS_1 = 0x10,
> +	R_CSI2_DATA_IDS_2 = 0x14,
> +	R_CSI2_IPI_MODE = 0x80,
> +	R_CSI2_IPI_VCID = 0x84,
> +	R_CSI2_IPI_DATA_TYPE = 0x88,
> +	R_CSI2_IPI_MEM_FLUSH = 0x8C,
> +	R_CSI2_IPI_HSA_TIME = 0x90,
> +	R_CSI2_IPI_HBP_TIME = 0x94,
> +	R_CSI2_IPI_HSD_TIME = 0x98,
> +	R_CSI2_IPI_HLINE_TIME = 0x9C,
> +	R_CSI2_IPI_VSA_LINES = 0xB0,
> +	R_CSI2_IPI_VBP_LINES = 0xB4,
> +	R_CSI2_IPI_VFP_LINES = 0xB8,
> +	R_CSI2_IPI_VACTIVE_LINES = 0xBC,
> +	R_CSI2_INT_PHY_FATAL = 0xe0,
> +	R_CSI2_MASK_INT_PHY_FATAL = 0xe4,
> +	R_CSI2_FORCE_INT_PHY_FATAL = 0xe8,
> +	R_CSI2_INT_PKT_FATAL = 0xf0,
> +	R_CSI2_MASK_INT_PKT_FATAL = 0xf4,
> +	R_CSI2_FORCE_INT_PKT_FATAL = 0xf8,
> +	R_CSI2_INT_FRAME_FATAL = 0x100,
> +	R_CSI2_MASK_INT_FRAME_FATAL = 0x104,
> +	R_CSI2_FORCE_INT_FRAME_FATAL = 0x108,
> +	R_CSI2_INT_PHY = 0x110,
> +	R_CSI2_MASK_INT_PHY = 0x114,
> +	R_CSI2_FORCE_INT_PHY = 0x118,
> +	R_CSI2_INT_PKT = 0x120,
> +	R_CSI2_MASK_INT_PKT = 0x124,
> +	R_CSI2_FORCE_INT_PKT = 0x128,
> +	R_CSI2_INT_LINE = 0x130,
> +	R_CSI2_MASK_INT_LINE = 0x134,
> +	R_CSI2_FORCE_INT_LINE = 0x138,
> +	R_CSI2_INT_IPI = 0x140,
> +	R_CSI2_MASK_INT_IPI = 0x144,
> +	R_CSI2_FORCE_INT_IPI = 0x148
> +};
> +
> +/** @short IPI Data Types */
> +enum data_type {
> +	CSI_2_YUV420_8 = 0x18,
> +	CSI_2_YUV420_10 = 0x19,
> +	CSI_2_YUV420_8_LEG = 0x1A,
> +	CSI_2_YUV420_8_SHIFT = 0x1C,
> +	CSI_2_YUV420_10_SHIFT = 0x1D,
> +	CSI_2_YUV422_8 = 0x1E,
> +	CSI_2_YUV422_10 = 0x1F,
> +	CSI_2_RGB444 = 0x20,
> +	CSI_2_RGB555 = 0x21,
> +	CSI_2_RGB565 = 0x22,
> +	CSI_2_RGB666 = 0x23,
> +	CSI_2_RGB888 = 0x24,
> +	CSI_2_RAW6 = 0x28,
> +	CSI_2_RAW7 = 0x29,
> +	CSI_2_RAW8 = 0x2A,
> +	CSI_2_RAW10 = 0x2B,
> +	CSI_2_RAW12 = 0x2C,
> +	CSI_2_RAW14 = 0x2D,
> +};
> +
> +/** @short Interrupt Masks */
> +enum interrupt_type {
> +	CSI2_INT_PHY_FATAL = 1 << 0,
> +	CSI2_INT_PKT_FATAL = 1 << 1,
> +	CSI2_INT_FRAME_FATAL = 1 << 2,
> +	CSI2_INT_PHY = 1 << 16,
> +	CSI2_INT_PKT = 1 << 17,
> +	CSI2_INT_LINE = 1 << 18,
> +	CSI2_INT_IPI = 1 << 19,
> +
> +};
> +
> +/** @short DWC MIPI CSI-2 output types*/
> +enum output_type {
> +	IPI_OUT = 0,
> +	IDI_OUT = 1,
> +	BOTH_OUT = 2
> +};
> +
> +/** @short IPI output types*/
> +enum ipi_output_type {
> +	CAMERA_TIMING = 0,
> +	AUTO_TIMING = 1
> +};
> +
> +/**
> + * @short Format template
> + */
> +struct mipi_fmt {
> +	const char *name;
> +	u32 code;
> +	u8 depth;
> +};
> +
> +struct csi_hw {
> +
> +	uint32_t num_lanes;
> +	uint32_t output_type;
> +
> +	/*IPI Info */
> +	uint32_t ipi_mode;
> +	uint32_t ipi_color_mode;
> +	uint32_t ipi_auto_flush;
> +	uint32_t virtual_ch;
> +
> +	uint32_t hsa;
> +	uint32_t hbp;
> +	uint32_t hsd;
> +	uint32_t htotal;
> +
> +	uint32_t vsa;
> +	uint32_t vbp;
> +	uint32_t vfp;
> +	uint32_t vactive;
> +};
> +
> +/**
> + * @short Structure to embed device driver information
> + */
> +struct mipi_csi_dev {
> +	struct v4l2_subdev sd;
> +	struct video_device vdev;
> +
> +	struct mutex lock;
> +	spinlock_t slock;
> +	struct media_pad pads[CSI_PADS_NUM];
> +	struct platform_device *pdev;
> +	u8 index;
> +
> +	/** Store current format */
> +	const struct mipi_fmt *fmt;
> +	struct v4l2_mbus_framefmt format;
> +
> +	/** Device Tree Information */
> +	void __iomem *base_address;
> +	uint32_t ctrl_irq_number;
> +
> +	struct csi_hw hw;
> +
> +	struct phy *phy;
> +};
> +
> +#endif				/* DW_MIPI_CSI */
> diff --git a/drivers/media/platform/dwc/plat_ipk.c b/drivers/media/platform/dwc/plat_ipk.c
> new file mode 100644
> index 0000000..48b9e36
> --- /dev/null
> +++ b/drivers/media/platform/dwc/plat_ipk.c
> @@ -0,0 +1,835 @@
> +/**
> + * DWC MIPI CSI-2 Host IPK platform device driver
> + *
> + * Based on Omnivision OV7670 Camera Driver
> + * Copyright (C) 2011 - 2013 Samsung Electronics Co., Ltd.
> + * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
> + *
> + * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
> + * Author: Ramiro Oliveira <ramiro.oliveira@synopsys.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published
> + * by the Free Software Foundation, either version 2 of the License,
> + * or (at your option) any later version.
> + */
> +
> +#include "plat_ipk.h"
> +#include "video_device.h"
> +#include "dw_mipi_csi.h"
> +#include <media/v4l2-of.h>
> +#include <media/v4l2-subdev.h>
> +
> +static int
> +__plat_ipk_pipeline_s_format(struct plat_ipk_media_pipeline *ep,
> +			     struct v4l2_subdev_format *fmt)
> +{
> +
> +	struct plat_ipk_pipeline *p = to_plat_ipk_pipeline(ep);
> +	static const u8 seq[IDX_MAX] = {IDX_SENSOR, IDX_CSI, IDX_VDEV};
> +
> +	fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
> +	v4l2_subdev_call(p->subdevs[seq[IDX_CSI]], pad, set_fmt, NULL, fmt);
> +
> +	return 0;
> +}
> +
> +static void
> +plat_ipk_pipeline_prepare(struct plat_ipk_pipeline *p, struct media_entity *me)
> +{
> +	struct v4l2_subdev *sd;
> +	int i = 0;

unsigned int?

> +
> +	for (i = 0; i < IDX_MAX; i++)
> +		p->subdevs[i] = NULL;
> +
> +	while (1) {
> +		struct media_pad *pad = NULL;
> +
> +		for (i = 0; i < me->num_pads; i++) {
> +			struct media_pad *spad = &me->pads[i];
> +
> +			if (!(spad->flags & MEDIA_PAD_FL_SINK))
> +				continue;
> +
> +			pad = media_entity_remote_pad(spad);
> +			if (pad)
> +				break;
> +		}
> +		if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
> +			break;
> +
> +		sd = media_entity_to_v4l2_subdev(pad->entity);
> +
> +		switch (sd->grp_id) {
> +		case GRP_ID_SENSOR:
> +			p->subdevs[IDX_SENSOR] = sd;
> +			break;
> +		case GRP_ID_CSI:
> +			p->subdevs[IDX_CSI] = sd;
> +			break;
> +		case GRP_ID_VIDEODEV:
> +			p->subdevs[IDX_VDEV] = sd;
> +			break;
> +		default:
> +			break;
> +		}
> +		me = &sd->entity;
> +		if (me->num_pads == 1)
> +			break;
> +	}
> +}
> +
> +static int __subdev_set_power(struct v4l2_subdev *sd, int on)
> +{
> +	int *use_count;
> +	int ret;
> +
> +	if (sd == NULL) {
> +		pr_info("null subdev\n");
> +		return -ENXIO;
> +	}
> +	use_count = &sd->entity.use_count;
> +	if (on && (*use_count)++ > 0)
> +		return 0;
> +	else if (!on && (*use_count == 0 || --(*use_count) > 0))
> +		return 0;
> +
> +	pr_debug("%d %s !\n", on, sd->entity.name);

Please do use dev_*() family of functions instead.

> +	ret = v4l2_subdev_call(sd, core, s_power, on);
> +
> +	return ret != -ENOIOCTLCMD ? ret : 0;
> +}
> +
> +static int plat_ipk_pipeline_s_power(struct plat_ipk_pipeline *p, bool on)
> +{
> +	static const u8 seq[IDX_MAX] = {IDX_CSI, IDX_SENSOR, IDX_VDEV};
> +	int i, ret = 0;
> +
> +	for (i = 0; i < IDX_MAX; i++) {
> +		unsigned int idx = seq[i];
> +
> +		if (p->subdevs[idx] == NULL)
> +			pr_info("No device registered on %d\n", idx);
> +		else {
> +			ret = __subdev_set_power(p->subdevs[idx], on);
> +			if (ret < 0 && ret != -ENXIO)
> +				goto error;
> +		}
> +	}
> +	return 0;
> +error:
> +	for (; i >= 0; i--) {
> +		unsigned int idx = seq[i];
> +
> +		__subdev_set_power(p->subdevs[idx], !on);
> +	}
> +	return ret;
> +}
> +
> +static int
> +__plat_ipk_pipeline_open(struct plat_ipk_media_pipeline *ep,
> +			 struct media_entity *me, bool prepare)
> +{
> +	struct plat_ipk_pipeline *p = to_plat_ipk_pipeline(ep);
> +	int ret;
> +
> +	if (WARN_ON(p == NULL || me == NULL))
> +		return -EINVAL;
> +
> +	if (prepare)
> +		plat_ipk_pipeline_prepare(p, me);
> +
> +	ret = plat_ipk_pipeline_s_power(p, 1);
> +	if (!ret)
> +		return 0;
> +
> +	return ret;
> +}
> +
> +static int __plat_ipk_pipeline_close(struct plat_ipk_media_pipeline *ep)
> +{
> +	struct plat_ipk_pipeline *p = to_plat_ipk_pipeline(ep);
> +	int ret;
> +
> +	ret = plat_ipk_pipeline_s_power(p, 0);
> +
> +	return ret == -ENXIO ? 0 : ret;
> +}
> +
> +static int
> +__plat_ipk_pipeline_s_stream(struct plat_ipk_media_pipeline *ep, bool on)
> +{
> +	static const u8 seq[IDX_MAX] = {IDX_SENSOR, IDX_CSI, IDX_VDEV};
> +	struct plat_ipk_pipeline *p = to_plat_ipk_pipeline(ep);
> +	int i, ret = 0;
> +
> +	for (i = 0; i < IDX_MAX; i++) {
> +		unsigned int idx = seq[i];
> +
> +		if (p->subdevs[idx] == NULL)
> +			pr_debug("No device registered on %d\n", idx);
> +		else {
> +			ret =
> +			    v4l2_subdev_call(p->subdevs[idx], video, s_stream,
> +					     on);
> +
> +			if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
> +				goto error;
> +		}
> +	}
> +	return 0;
> +error:
> +	for (; i >= 0; i--) {
> +		unsigned int idx = seq[i];
> +
> +		v4l2_subdev_call(p->subdevs[idx], video, s_stream, !on);
> +	}
> +	return ret;
> +}
> +
> +static const struct plat_ipk_media_pipeline_ops plat_ipk_pipeline_ops = {
> +	.open = __plat_ipk_pipeline_open,
> +	.close = __plat_ipk_pipeline_close,
> +	.set_format = __plat_ipk_pipeline_s_format,
> +	.set_stream = __plat_ipk_pipeline_s_stream,
> +};
> +
> +static struct plat_ipk_media_pipeline *
> +plat_ipk_pipeline_create(struct plat_ipk_dev *plat_ipk)
> +{
> +	struct plat_ipk_pipeline *p;
> +
> +	p = kzalloc(sizeof(*p), GFP_KERNEL);
> +	if (!p)
> +		return NULL;
> +
> +	list_add_tail(&p->list, &plat_ipk->pipelines);
> +
> +	p->ep.ops = &plat_ipk_pipeline_ops;
> +	return &p->ep;
> +}
> +
> +static void
> +plat_ipk_pipelines_free(struct plat_ipk_dev *plat_ipk)
> +{
> +	while (!list_empty(&plat_ipk->pipelines)) {
> +		struct plat_ipk_pipeline *p;
> +
> +		p = list_entry(plat_ipk->pipelines.next, typeof(*p), list);
> +		list_del(&p->list);
> +		kfree(p);
> +	}
> +}
> +
> +static int
> +plat_ipk_parse_port_node(struct plat_ipk_dev *plat_ipk,
> +			 struct device_node *port, unsigned int index)
> +{
> +	struct device_node *rem, *ep;
> +	struct v4l2_of_endpoint endpoint;
> +	struct plat_ipk_source_info *pd = &plat_ipk->sensor[index].pdata;
> +
> +	/* Assume here a port node can have only one endpoint node. */
> +	ep = of_get_next_child(port, NULL);
> +	if (!ep)
> +		return 0;
> +
> +	v4l2_of_parse_endpoint(ep, &endpoint);
> +	if (WARN_ON(endpoint.base.port == 0) || index >= PLAT_MAX_SENSORS)
> +		return -EINVAL;
> +
> +	pd->mux_id = endpoint.base.port - 1;
> +
> +	rem = of_graph_get_remote_port_parent(ep);
> +	of_node_put(ep);
> +	if (rem == NULL) {
> +		v4l2_info(&plat_ipk->v4l2_dev,
> +			  "Remote device at %s not found\n", ep->full_name);
> +		return 0;
> +	}
> +
> +	if (WARN_ON(index >= ARRAY_SIZE(plat_ipk->sensor)))
> +		return -EINVAL;
> +
> +	plat_ipk->sensor[index].asd.match_type = V4L2_ASYNC_MATCH_OF;
> +	plat_ipk->sensor[index].asd.match.of.node = rem;
> +	plat_ipk->async_subdevs[index] = &plat_ipk->sensor[index].asd;
> +
> +	plat_ipk->num_sensors++;
> +
> +	of_node_put(rem);
> +	return 0;
> +}
> +
> +
> +static int plat_ipk_register_sensor_entities(struct plat_ipk_dev *plat_ipk)
> +{
> +	struct device_node *parent = plat_ipk->pdev->dev.of_node;
> +	struct device_node *node;
> +	int index = 0;
> +	int ret;
> +
> +	plat_ipk->num_sensors = 0;
> +
> +	for_each_available_child_of_node(parent, node) {
> +		struct device_node *port;
> +
> +		if (of_node_cmp(node->name, "csi2"))
> +			continue;
> +		port = of_get_next_child(node, NULL);
> +		if (!port)
> +			continue;
> +
> +		ret = plat_ipk_parse_port_node(plat_ipk, port, index);
> +		if (ret < 0)
> +			return ret;
> +		index++;
> +	}
> +	return 0;
> +}
> +
> +static int
> +__of_get_port_id(struct device_node *np)
> +{
> +	u32 reg = 0;
> +
> +	np = of_get_child_by_name(np, "port");
> +	if (!np)
> +		return -EINVAL;
> +	of_property_read_u32(np, "reg", &reg);
> +
> +	return reg - 1;
> +}
> +
> +static int register_videodev_entity(struct plat_ipk_dev *plat_ipk,
> +			 struct video_device_dev *vid_dev)
> +{
> +	struct v4l2_subdev *sd;
> +	struct plat_ipk_media_pipeline *ep;
> +	int ret;
> +
> +	sd = &vid_dev->subdev;
> +	sd->grp_id = GRP_ID_VIDEODEV;
> +
> +	ep = plat_ipk_pipeline_create(plat_ipk);
> +	if (!ep)
> +		return -ENOMEM;
> +
> +	v4l2_set_subdev_hostdata(sd, ep);
> +
> +	ret = v4l2_device_register_subdev(&plat_ipk->v4l2_dev, sd);
> +	if (!ret)
> +		plat_ipk->vid_dev = vid_dev;
> +	else
> +		v4l2_err(&plat_ipk->v4l2_dev,
> +			 "Failed to register Video Device\n");
> +	return ret;
> +}
> +
> +static int register_mipi_csi_entity(struct plat_ipk_dev *plat_ipk,
> +			 struct platform_device *pdev, struct v4l2_subdev *sd)
> +{
> +	struct device_node *node = pdev->dev.of_node;
> +	int id, ret;
> +
> +	id = node ? __of_get_port_id(node) : max(0, pdev->id);
> +
> +	if (WARN_ON(id < 0 || id >= CSI_MAX_ENTITIES))
> +		return -ENOENT;
> +
> +	if (WARN_ON(plat_ipk->mipi_csi[id].sd))
> +		return -EBUSY;
> +
> +	sd->grp_id = GRP_ID_CSI;
> +	ret = v4l2_device_register_subdev(&plat_ipk->v4l2_dev, sd);
> +
> +	if (!ret)
> +		plat_ipk->mipi_csi[id].sd = sd;
> +	else
> +		v4l2_err(&plat_ipk->v4l2_dev,
> +			 "Failed to register MIPI-CSI.%d (%d)\n", id, ret);
> +	return ret;
> +}
> +
> +static int plat_ipk_register_platform_entity(struct plat_ipk_dev *plat_ipk,
> +				struct platform_device *pdev, int plat_entity)
> +{
> +	struct device *dev = &pdev->dev;
> +	int ret = -EPROBE_DEFER;
> +	void *drvdata;
> +
> +

Extra newline.

> +	device_lock(dev);
> +	if (!dev->driver || !try_module_get(dev->driver->owner))
> +		goto dev_unlock;
> +
> +	drvdata = dev_get_drvdata(dev);
> +
> +	if (drvdata) {
> +		switch (plat_entity) {
> +		case IDX_VDEV:
> +			ret = register_videodev_entity(plat_ipk, drvdata);
> +			break;
> +		case IDX_CSI:
> +			ret = register_mipi_csi_entity(plat_ipk, pdev, drvdata);
> +			break;
> +		default:
> +			ret = -ENODEV;
> +		}
> +	} else
> +		dev_err(&plat_ipk->pdev->dev, "%s no drvdata\n", dev_name(dev));
> +	module_put(dev->driver->owner);
> +dev_unlock:
> +	device_unlock(dev);
> +	if (ret == -EPROBE_DEFER)
> +		dev_info(&plat_ipk->pdev->dev,
> +			 "deferring %s device registration\n", dev_name(dev));
> +	else if (ret < 0)
> +		dev_err(&plat_ipk->pdev->dev,
> +			"%s device registration failed (%d)\n", dev_name(dev),
> +			ret);
> +	return ret;
> +}
> +
> +static int
> +plat_ipk_register_platform_entities(struct plat_ipk_dev *plat_ipk,
> +				    struct device_node *parent)
> +{
> +	struct device_node *node;
> +	int ret = 0;
> +
> +	for_each_available_child_of_node(parent, node) {
> +		struct platform_device *pdev;
> +		int plat_entity = -1;
> +
> +		pdev = of_find_device_by_node(node);
> +		if (!pdev)
> +			continue;
> +
> +		if (!strcmp(node->name, VIDEODEV_OF_NODE_NAME))
> +			plat_entity = IDX_VDEV;
> +		else if (!strcmp(node->name, CSI_OF_NODE_NAME))
> +			plat_entity = IDX_CSI;
> +
> +		if (plat_entity >= 0)
> +			ret = plat_ipk_register_platform_entity(plat_ipk, pdev,
> +								plat_entity);
> +		put_device(&pdev->dev);
> +		if (ret < 0)
> +			break;
> +	}
> +
> +	return ret;
> +}
> +
> +static void
> +plat_ipk_unregister_entities(struct plat_ipk_dev *plat_ipk)
> +{
> +	int i;
> +	struct video_device_dev *dev = plat_ipk->vid_dev;
> +
> +	if (dev == NULL)
> +		return;
> +	v4l2_device_unregister_subdev(&dev->subdev);
> +	dev->ve.pipe = NULL;
> +	plat_ipk->vid_dev = NULL;
> +
> +	for (i = 0; i < CSI_MAX_ENTITIES; i++) {
> +		if (plat_ipk->mipi_csi[i].sd == NULL)
> +			continue;
> +		v4l2_device_unregister_subdev(plat_ipk->mipi_csi[i].sd);
> +		plat_ipk->mipi_csi[i].sd = NULL;
> +	}
> +
> +	v4l2_info(&plat_ipk->v4l2_dev, "Unregistered all entities\n");
> +}
> +
> +static int
> +__plat_ipk_create_videodev_sink_links(struct plat_ipk_dev *plat_ipk,
> +				      struct media_entity *source,
> +				      int pad)
> +{
> +	struct media_entity *sink;
> +	int ret = 0;
> +
> +	if (!plat_ipk->vid_dev)
> +		return 0;
> +
> +	sink = &plat_ipk->vid_dev->subdev.entity;
> +	ret = media_create_pad_link(source, pad, sink,
> +				    CSI_PAD_SOURCE, MEDIA_LNK_FL_ENABLED);
> +	if (ret)
> +		return ret;
> +
> +	ret = media_entity_call(sink, link_setup, &sink->pads[0],
> +				&source->pads[pad], 0);

What's the purpose of calling link_setup() here?

> +	if (ret)
> +		return 0;
> +
> +	v4l2_info(&plat_ipk->v4l2_dev, "created link [%s] -> [%s]\n",
> +		  source->name, sink->name);
> +
> +	return 0;
> +}
> +
> +
> +static int
> +__plat_ipk_create_videodev_source_links(struct plat_ipk_dev *plat_ipk)
> +{
> +	struct media_entity *source, *sink;
> +	int ret = 0;
> +
> +	struct video_device_dev *vid_dev = plat_ipk->vid_dev;
> +
> +	if (vid_dev == NULL)
> +		return -ENODEV;
> +
> +	source = &vid_dev->subdev.entity;
> +	sink = &vid_dev->ve.vdev.entity;
> +
> +	ret = media_create_pad_link(source, VIDEO_DEV_SD_PAD_SOURCE_DMA,
> +				    sink, 0, MEDIA_LNK_FL_ENABLED);
> +
> +	v4l2_info(&plat_ipk->v4l2_dev, "created link [%s] -> [%s]\n",
> +		  source->name, sink->name);
> +	return ret;
> +}
> +
> +static int
> +plat_ipk_create_links(struct plat_ipk_dev *plat_ipk)
> +{
> +	struct v4l2_subdev *csi_sensor[CSI_MAX_ENTITIES] = { NULL };
> +	struct v4l2_subdev *sensor, *csi;
> +	struct media_entity *source;
> +	struct plat_ipk_source_info *pdata;
> +	int i, pad, ret = 0;
> +
> +	for (i = 0; i < plat_ipk->num_sensors; i++) {
> +		if (plat_ipk->sensor[i].subdev == NULL)
> +			continue;
> +
> +		sensor = plat_ipk->sensor[i].subdev;
> +		pdata = v4l2_get_subdev_hostdata(sensor);
> +		if (!pdata)
> +			continue;
> +
> +		source = NULL;
> +
> +		csi = plat_ipk->mipi_csi[pdata->mux_id].sd;
> +		if (WARN(csi == NULL, "MIPI-CSI interface specified but	dw-mipi-csi module is not loaded!\n"))
> +			return -EINVAL;
> +
> +		pad = sensor->entity.num_pads - 1;
> +		ret = media_create_pad_link(&sensor->entity, pad,
> +					    &csi->entity, CSI_PAD_SINK,
> +					    MEDIA_LNK_FL_IMMUTABLE |
> +					    MEDIA_LNK_FL_ENABLED);
> +
> +		if (ret)
> +			return ret;
> +		v4l2_info(&plat_ipk->v4l2_dev, "created link [%s] -> [%s]\n",
> +			  sensor->entity.name, csi->entity.name);

dev_dbg() ?

> +
> +		csi_sensor[pdata->mux_id] = sensor;
> +	}
> +
> +	for (i = 0; i < CSI_MAX_ENTITIES; i++) {
> +		if (plat_ipk->mipi_csi[i].sd == NULL) {
> +			pr_info("no link\n");
> +			continue;
> +		}
> +
> +		source = &plat_ipk->mipi_csi[i].sd->entity;
> +		pad = VIDEO_DEV_SD_PAD_SINK_CSI;
> +
> +		ret = __plat_ipk_create_videodev_sink_links(plat_ipk, source,
> +								pad);
> +	}
> +
> +	ret = __plat_ipk_create_videodev_source_links(plat_ipk);
> +	if (ret < 0)
> +		return ret;
> +
> +	return ret;
> +}
> +
> +static int __plat_ipk_modify_pipeline(struct media_entity *entity, bool enable)
> +{
> +	struct plat_ipk_video_entity *ve;
> +	struct plat_ipk_pipeline *p;
> +	struct video_device *vdev;
> +	int ret;
> +
> +	vdev = media_entity_to_video_device(entity);
> +
> +	if (vdev->entity.use_count == 0)
> +		return 0;
> +
> +	ve = vdev_to_plat_ipk_video_entity(vdev);
> +	p = to_plat_ipk_pipeline(ve->pipe);
> +
> +	if (enable)
> +		ret = __plat_ipk_pipeline_open(ve->pipe, entity, true);
> +	else
> +		ret = __plat_ipk_pipeline_close(ve->pipe);
> +
> +	if (ret == 0 && !enable)
> +		memset(p->subdevs, 0, sizeof(p->subdevs));
> +
> +	return ret;
> +}
> +
> +
> +static int
> +__plat_ipk_modify_pipelines(struct media_entity *entity, bool enable,
> +			    struct media_entity_graph *graph)
> +{
> +	struct media_entity *entity_err = entity;
> +	int ret;
> +
> +	media_entity_graph_walk_start(graph, entity);
> +
> +	while ((entity = media_entity_graph_walk_next(graph))) {
> +		if (!is_media_entity_v4l2_video_device(entity))
> +			continue;
> +
> +		ret = __plat_ipk_modify_pipeline(entity, enable);
> +
> +		if (ret < 0)
> +			goto err;
> +	}
> +
> +	return 0;
> +
> +err:
> +	media_entity_graph_walk_start(graph, entity_err);
> +
> +	while ((entity_err = media_entity_graph_walk_next(graph))) {
> +		if (!is_media_entity_v4l2_video_device(entity_err))
> +			continue;
> +
> +		__plat_ipk_modify_pipeline(entity_err, !enable);
> +
> +		if (entity_err == entity)
> +			break;
> +	}
> +
> +	return ret;
> +}
> +
> +static int
> +plat_ipk_link_notify(struct media_link *link, unsigned int flags,
> +		     unsigned int notification)
> +{
> +	struct media_entity_graph *graph =
> +	    &container_of(link->graph_obj.mdev, struct plat_ipk_dev,
> +			  media_dev)->link_setup_graph;
> +	struct media_entity *sink = link->sink->entity;
> +	int ret = 0;
> +
> +	pr_debug("Link notify\n");

This probably made sense at development time but should be removed now.

> +
> +	if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH) {
> +		ret = media_entity_graph_walk_init(graph, link->graph_obj.mdev);
> +		if (ret)
> +			return ret;
> +		if (!(flags & MEDIA_LNK_FL_ENABLED))
> +			ret = __plat_ipk_modify_pipelines(sink, false, graph);
> +
> +	} else if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH) {
> +		if (link->flags & MEDIA_LNK_FL_ENABLED)
> +			ret = __plat_ipk_modify_pipelines(sink, true, graph);
> +		media_entity_graph_walk_cleanup(graph);
> +	}
> +
> +	return ret ? -EPIPE : 0;
> +}

Missing newline.

> +static const struct media_device_ops plat_ipk_media_ops = {
> +	.link_notify = plat_ipk_link_notify,
> +};
> +
> +
> +static int
> +subdev_notifier_bound(struct v4l2_async_notifier *notifier,
> +		      struct v4l2_subdev *subdev, struct v4l2_async_subdev *asd)
> +{
> +	struct plat_ipk_dev *plat_ipk = notifier_to_plat_ipk(notifier);
> +	struct plat_ipk_sensor_info *si = NULL;
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(plat_ipk->sensor); i++)
> +		if (plat_ipk->sensor[i].asd.match.of.node ==
> +		    subdev->dev->of_node)
> +			si = &plat_ipk->sensor[i];
> +
> +	if (si == NULL)
> +		return -EINVAL;
> +
> +	v4l2_set_subdev_hostdata(subdev, &si->pdata);
> +
> +	subdev->grp_id = GRP_ID_SENSOR;
> +
> +	si->subdev = subdev;
> +
> +	v4l2_info(&plat_ipk->v4l2_dev, "Registered sensor subdevice: %s (%d)\n",
> +		  subdev->name, plat_ipk->num_sensors);
> +
> +	plat_ipk->num_sensors++;
> +
> +	return 0;
> +}
> +
> +static int
> +subdev_notifier_complete(struct v4l2_async_notifier *notifier)
> +{
> +	struct plat_ipk_dev *plat_ipk = notifier_to_plat_ipk(notifier);
> +	int ret;
> +
> +	mutex_lock(&plat_ipk->media_dev.graph_mutex);
> +
> +	ret = plat_ipk_create_links(plat_ipk);
> +	if (ret < 0)
> +		goto unlock;
> +
> +	ret = v4l2_device_register_subdev_nodes(&plat_ipk->v4l2_dev);
> +unlock:
> +	mutex_unlock(&plat_ipk->media_dev.graph_mutex);
> +	if (ret < 0)
> +		return ret;
> +
> +	return media_device_register(&plat_ipk->media_dev);
> +}
> +
> +static const struct of_device_id plat_ipk_of_match[];

This is redundant.

> +
> +static int plat_ipk_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct v4l2_device *v4l2_dev;
> +	struct plat_ipk_dev *plat_ipk;
> +	int ret;
> +
> +	dev_info(dev, "Installing DW MIPI CSI-2 IPK Platform module\n");
> +
> +	plat_ipk = devm_kzalloc(dev, sizeof(*plat_ipk), GFP_KERNEL);
> +	if (!plat_ipk)
> +		return -ENOMEM;
> +
> +	spin_lock_init(&plat_ipk->slock);
> +	INIT_LIST_HEAD(&plat_ipk->pipelines);
> +	plat_ipk->pdev = pdev;
> +
> +	strlcpy(plat_ipk->media_dev.model, "SNPS IPK Platform",
> +		sizeof(plat_ipk->media_dev.model));
> +	plat_ipk->media_dev.ops = &plat_ipk_media_ops;
> +	plat_ipk->media_dev.dev = dev;
> +
> +	v4l2_dev = &plat_ipk->v4l2_dev;
> +	v4l2_dev->mdev = &plat_ipk->media_dev;
> +	strlcpy(v4l2_dev->name, "plat-ipk", sizeof(v4l2_dev->name));
> +
> +	media_device_init(&plat_ipk->media_dev);
> +
> +	ret = v4l2_device_register(dev, &plat_ipk->v4l2_dev);
> +	if (ret < 0) {
> +		v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
> +		return ret;
> +	}
> +
> +	platform_set_drvdata(pdev, plat_ipk);
> +
> +	ret = plat_ipk_register_platform_entities(plat_ipk, dev->of_node);
> +	if (ret)
> +		goto err_m_ent;
> +
> +	ret = plat_ipk_register_sensor_entities(plat_ipk);
> +	if (ret)
> +		goto err_m_ent;
> +
> +	if (plat_ipk->num_sensors > 0) {
> +		plat_ipk->subdev_notifier.subdevs = plat_ipk->async_subdevs;
> +		plat_ipk->subdev_notifier.num_subdevs = plat_ipk->num_sensors;
> +		plat_ipk->subdev_notifier.bound = subdev_notifier_bound;
> +		plat_ipk->subdev_notifier.complete = subdev_notifier_complete;
> +		plat_ipk->num_sensors = 0;
> +
> +		ret = v4l2_async_notifier_register(&plat_ipk->v4l2_dev,
> +						   &plat_ipk->subdev_notifier);
> +		if (ret)
> +			goto err_m_ent;
> +	}
> +
> +	return 0;
> +
> +err_m_ent:
> +	plat_ipk_unregister_entities(plat_ipk);
> +	media_device_unregister(&plat_ipk->media_dev);
> +	media_device_cleanup(&plat_ipk->media_dev);
> +	v4l2_device_unregister(&plat_ipk->v4l2_dev);
> +	return ret;
> +}
> +
> +static int plat_ipk_remove(struct platform_device *pdev)
> +{
> +	struct plat_ipk_dev *dev = platform_get_drvdata(pdev);
> +
> +	if (!dev)
> +		return 0;

Wouldn't !dev here require a driver bug? If probe() succeeds, then dev is
non-zero, right?

> +
> +	v4l2_async_notifier_unregister(&dev->subdev_notifier);
> +
> +	v4l2_device_unregister(&dev->v4l2_dev);
> +	plat_ipk_unregister_entities(dev);
> +	plat_ipk_pipelines_free(dev);
> +	media_device_unregister(&dev->media_dev);
> +	media_device_cleanup(&dev->media_dev);
> +
> +	dev_info(&pdev->dev, "Driver removed\n");
> +
> +	return 0;
> +}
> +
> +/**
> + * @short of_device_id structure
> + */
> +static const struct of_device_id plat_ipk_of_match[] = {
> +	{.compatible = "snps,plat-ipk"},
> +	{}
> +};
> +
> +MODULE_DEVICE_TABLE(of, plat_ipk_of_match);
> +
> +/**
> + * @short Platform driver structure
> + */
> +static struct platform_driver plat_ipk_pdrv = {
> +	.remove = plat_ipk_remove,
> +	.probe = plat_ipk_probe,
> +	.driver = {
> +		   .name = "snps,plat-ipk",
> +		   .owner = THIS_MODULE,
> +		   .of_match_table = plat_ipk_of_match,
> +		   },
> +};
> +
> +static int __init
> +plat_ipk_init(void)
> +{
> +	request_module("dw-mipi-csi");

Why do you need this?

> +
> +	return platform_driver_register(&plat_ipk_pdrv);
> +}
> +
> +static void __exit
> +plat_ipk_exit(void)
> +{
> +	platform_driver_unregister(&plat_ipk_pdrv);
> +}
> +
> +module_init(plat_ipk_init);
> +module_exit(plat_ipk_exit);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Ramiro Oliveira <roliveir@synopsys.com>");
> +MODULE_DESCRIPTION("Platform driver for MIPI CSI-2 Host IPK");
> diff --git a/drivers/media/platform/dwc/plat_ipk.h b/drivers/media/platform/dwc/plat_ipk.h
> new file mode 100644
> index 0000000..ef569eb
> --- /dev/null
> +++ b/drivers/media/platform/dwc/plat_ipk.h
> @@ -0,0 +1,97 @@
> +/*
> + * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef PLAT_IPK_H_
> +#define PLAT_IPK_H_
> +
> +#include <linux/module.h>
> +#include <linux/errno.h>
> +#include <linux/kernel.h>
> +#include <linux/types.h>
> +#include <linux/slab.h>
> +#include <linux/platform_device.h>
> +#include <linux/of_platform.h>
> +#include <linux/list.h>
> +#include <linux/string.h>
> +#include <media/v4l2-device.h>
> +#include <linux/videodev2.h>
> +#include <media/media-entity.h>
> +
> +#include "plat_ipk_video.h"
> +
> +#define VIDEODEV_OF_NODE_NAME	"video-device"
> +#define CSI_OF_NODE_NAME	"csi2"
> +
> +enum plat_ipk_subdev_index {
> +	IDX_SENSOR,
> +	IDX_CSI,
> +	IDX_VDEV,
> +	IDX_MAX,
> +};
> +
> +struct plat_ipk_sensor_info {
> +	struct plat_ipk_source_info pdata;
> +	struct v4l2_async_subdev asd;
> +	struct v4l2_subdev *subdev;
> +	struct mipi_csi_dev *host;
> +};
> +
> +struct plat_ipk_pipeline {
> +	struct plat_ipk_media_pipeline ep;
> +	struct list_head list;
> +	struct media_entity *vdev_entity;
> +	struct v4l2_subdev *subdevs[IDX_MAX];
> +};
> +
> +#define to_plat_ipk_pipeline(_ep)\
> +	 container_of(_ep, struct plat_ipk_pipeline, ep)
> +
> +struct mipi_csi_info {
> +	struct v4l2_subdev *sd;
> +	int id;
> +};
> +
> +/**
> + * @short Structure to embed device driver information
> + */
> +struct plat_ipk_dev {
> +	struct mipi_csi_info		mipi_csi[CSI_MAX_ENTITIES];
> +	struct video_device_dev		*vid_dev;
> +	struct device			*dev;
> +	struct media_device		media_dev;
> +	struct v4l2_device		v4l2_dev;
> +	struct platform_device		*pdev;
> +	struct plat_ipk_sensor_info	sensor[PLAT_MAX_SENSORS];
> +	struct v4l2_async_notifier	subdev_notifier;
> +	struct v4l2_async_subdev	*async_subdevs[PLAT_MAX_SENSORS];
> +	spinlock_t			slock;
> +	struct list_head		pipelines;
> +	int				num_sensors;
> +	struct media_entity_graph	link_setup_graph;
> +};
> +
> +static inline struct plat_ipk_dev *
> +entity_to_plat_ipk_mdev(struct media_entity *me)
> +{
> +	return me->graph_obj.mdev == NULL ? NULL :
> +	    container_of(me->graph_obj.mdev, struct plat_ipk_dev, media_dev);
> +}
> +
> +static inline struct plat_ipk_dev *
> +notifier_to_plat_ipk(struct v4l2_async_notifier *n)
> +{
> +	return container_of(n, struct plat_ipk_dev, subdev_notifier);
> +}
> +
> +static inline void
> +plat_ipk_graph_unlock(struct plat_ipk_video_entity *ve)
> +{
> +	mutex_unlock(&ve->vdev.entity.graph_obj.mdev->graph_mutex);
> +}
> +
> +#endif				/* PLAT_IPK_H_ */
> diff --git a/drivers/media/platform/dwc/plat_ipk_video.h b/drivers/media/platform/dwc/plat_ipk_video.h
> new file mode 100644
> index 0000000..6bfc9f8
> --- /dev/null
> +++ b/drivers/media/platform/dwc/plat_ipk_video.h
> @@ -0,0 +1,97 @@
> +/*
> + * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef PLAT_IPK_INCLUDES_H_
> +#define PLAT_IPK_INCLUDES_H_
> +
> +#include <media/media-entity.h>
> +#include <media/v4l2-dev.h>
> +#include <media/v4l2-mediabus.h>
> +#include <media/v4l2-subdev.h>
> +
> +/*
> + * The subdevices' group IDs.
> + */
> +
> +#define MAX_WIDTH	3280
> +#define MAX_HEIGHT	1852
> +
> +#define MIN_WIDTH	640
> +#define MIN_HEIGHT	480
> +
> +#define GRP_ID_SENSOR		(10)
> +#define GRP_ID_CSI		(20)
> +#define GRP_ID_VIDEODEV		(30)
> +
> +#define CSI_MAX_ENTITIES	1
> +#define PLAT_MAX_SENSORS	1
> +
> +enum video_dev_pads {
> +	VIDEO_DEV_SD_PAD_SINK_CSI = 0,
> +	VIDEO_DEV_SD_PAD_SOURCE_DMA = 1,
> +	VIDEO_DEV_SD_PADS_NUM = 2,
> +};
> +
> +enum mipi_csi_pads {
> +	CSI_PAD_SINK = 0,
> +	CSI_PAD_SOURCE = 1,
> +	CSI_PADS_NUM = 2,
> +};
> +
> +struct plat_ipk_source_info {
> +	u16 flags;
> +	u16 mux_id;
> +};
> +
> +struct plat_ipk_fmt {
> +	u32 mbus_code;
> +	char *name;
> +	u32 fourcc;
> +	u8 depth;
> +};
> +
> +struct plat_ipk_media_pipeline;
> +
> +/*
> + * Media pipeline operations to be called from within a video node,  i.e. the
> + * last entity within the pipeline. Implemented by related media device driver.
> + */
> +struct plat_ipk_media_pipeline_ops {
> +	int (*prepare)(struct plat_ipk_media_pipeline *p,
> +			struct media_entity *me);
> +	int (*unprepare)(struct plat_ipk_media_pipeline *p);
> +	int (*open)(struct plat_ipk_media_pipeline *p,
> +			struct media_entity *me, bool resume);
> +	int (*close)(struct plat_ipk_media_pipeline *p);
> +	int (*set_stream)(struct plat_ipk_media_pipeline *p, bool state);
> +	int (*set_format)(struct plat_ipk_media_pipeline *p,
> +			struct v4l2_subdev_format *fmt);
> +};
> +
> +struct plat_ipk_video_entity {
> +	struct video_device vdev;
> +	struct plat_ipk_media_pipeline *pipe;
> +};
> +
> +struct plat_ipk_media_pipeline {
> +	struct media_pipeline mp;
> +	const struct plat_ipk_media_pipeline_ops *ops;
> +};
> +
> +static inline struct plat_ipk_video_entity *
> +vdev_to_plat_ipk_video_entity(struct video_device *vdev)
> +{
> +	return container_of(vdev, struct plat_ipk_video_entity, vdev);
> +}
> +
> +#define plat_ipk_pipeline_call(ent, op, args...)\
> +	(!(ent) ? -ENOENT : (((ent)->pipe->ops && (ent)->pipe->ops->op) ? \
> +	(ent)->pipe->ops->op(((ent)->pipe), ##args) : -ENOIOCTLCMD))	  \
> +
> +
> +#endif				/* PLAT_IPK_INCLUDES_H_ */
> diff --git a/drivers/media/platform/dwc/video_device.c b/drivers/media/platform/dwc/video_device.c
> new file mode 100644
> index 0000000..d827426
> --- /dev/null
> +++ b/drivers/media/platform/dwc/video_device.c
> @@ -0,0 +1,741 @@
> +/*
> + * DWC MIPI CSI-2 Host IPK video device device driver
> + *
> + * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
> + * Author: Ramiro Oliveira <ramiro.oliveira@synopsys.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published
> + * by the Free Software Foundation, either version 2 of the License,
> + * or (at your option) any later version.
> + */
> +
> +#include "video_device.h"
> +
> +const struct plat_ipk_fmt vid_dev_formats[] = {
> +	{
> +		.name = "RGB888",
> +		.fourcc = V4L2_PIX_FMT_BGR24,
> +		.depth = 24,
> +		.mbus_code = MEDIA_BUS_FMT_RGB888_2X12_LE,
> +	}, {
> +		.name = "RGB565",
> +		.fourcc = V4L2_PIX_FMT_RGB565,
> +		.depth = 16,
> +		.mbus_code = MEDIA_BUS_FMT_RGB565_2X8_BE,
> +	},
> +};
> +
> +const struct plat_ipk_fmt *
> +vid_dev_find_format(struct v4l2_format *f, int index)
> +{
> +	const struct plat_ipk_fmt *fmt = NULL;
> +	unsigned int i;
> +
> +	if (index >= (int) ARRAY_SIZE(vid_dev_formats))
> +		return NULL;
> +
> +	for (i = 0; i < ARRAY_SIZE(vid_dev_formats); ++i) {
> +		fmt = &vid_dev_formats[i];
> +		if (fmt->fourcc == f->fmt.pix.pixelformat)
> +			return fmt;
> +	}
> +	return NULL;
> +}
> +
> +/*
> + * Video node ioctl operations
> + */
> +static int
> +vidioc_querycap(struct file *file, void *priv, struct v4l2_capability *cap)
> +{
> +	struct video_device_dev *vid_dev = video_drvdata(file);
> +
> +	strlcpy(cap->driver, VIDEO_DEVICE_NAME, sizeof(cap->driver));
> +	strlcpy(cap->card, VIDEO_DEVICE_NAME, sizeof(cap->card));
> +	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
> +		 dev_name(&vid_dev->pdev->dev));
> +
> +	cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
> +	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
> +	return 0;
> +}
> +
> +int
> +vidioc_enum_fmt_vid_cap(struct file *file, void *priv, struct v4l2_fmtdesc *f)
> +{
> +	const struct plat_ipk_fmt *p_fmt;
> +
> +	if (f->index >= ARRAY_SIZE(vid_dev_formats))
> +		return -EINVAL;
> +
> +	p_fmt = &vid_dev_formats[f->index];
> +
> +	strlcpy(f->description, p_fmt->name, sizeof(f->description));
> +	f->pixelformat = p_fmt->fourcc;
> +
> +	return 0;
> +}
> +
> +int vidioc_g_fmt_vid_cap(struct file *file, void *priv, struct v4l2_format *f)
> +{
> +	struct video_device_dev *dev = video_drvdata(file);
> +
> +	memcpy(&f->fmt.pix, &dev->format.fmt.pix,
> +	       sizeof(struct v4l2_pix_format));
> +
> +	return 0;
> +}
> +
> +static int
> +vidioc_try_fmt_vid_cap(struct file *file, void *priv, struct v4l2_format *f)
> +{
> +	const struct plat_ipk_fmt *fmt;
> +
> +	fmt = vid_dev_find_format(f, -1);
> +	if (!fmt) {
> +		f->fmt.pix.pixelformat = V4L2_PIX_FMT_RGB565;
> +		fmt = vid_dev_find_format(f, -1);
> +	}
> +
> +	f->fmt.pix.field = V4L2_FIELD_NONE;
> +	v4l_bound_align_image(&f->fmt.pix.width, 48, MAX_WIDTH, 2,
> +			      &f->fmt.pix.height, 32, MAX_HEIGHT, 0, 0);
> +
> +	f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3;
> +	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
> +	f->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
> +	return 0;
> +}
> +
> +int vidioc_s_fmt_vid_cap(struct file *file, void *priv, struct v4l2_format *f)
> +{
> +	struct video_device_dev *dev = video_drvdata(file);
> +	int ret;
> +	struct v4l2_subdev_format fmt;
> +
> +	if (vb2_is_busy(&dev->vb_queue))
> +		return -EBUSY;
> +
> +	ret = vidioc_try_fmt_vid_cap(file, dev, f);
> +	if (ret)
> +		return ret;
> +
> +	dev->fmt = vid_dev_find_format(f, -1);
> +	pixel_format(dev) = f->fmt.pix.pixelformat;
> +	width(dev) = f->fmt.pix.width;
> +	height(dev) = f->fmt.pix.height;
> +	bytes_per_line(dev) = width(dev) * dev->fmt->depth / 8;
> +	size_image(dev) = height(dev) * bytes_per_line(dev);
> +
> +	fmt.format.colorspace = V4L2_COLORSPACE_SRGB;
> +	fmt.format.code = dev->fmt->mbus_code;
> +
> +	fmt.format.width = width(dev);
> +	fmt.format.height = height(dev);
> +
> +	ret = plat_ipk_pipeline_call(&dev->ve, set_format, &fmt);
> +
> +	return 0;
> +}
> +
> +int vidioc_enum_framesizes(struct file *file, void *fh,
> +		       struct v4l2_frmsizeenum *fsize)
> +{
> +	static const struct v4l2_frmsize_stepwise sizes = {
> +		48, MAX_WIDTH, 4,
> +		32, MAX_HEIGHT, 1
> +	};
> +	int i;
> +
> +	if (fsize->index)
> +		return -EINVAL;
> +	for (i = 0; i < ARRAY_SIZE(vid_dev_formats); i++)
> +		if (vid_dev_formats[i].fourcc == fsize->pixel_format)
> +			break;
> +	if (i == ARRAY_SIZE(vid_dev_formats))
> +		return -EINVAL;
> +	fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
> +	fsize->stepwise = sizes;
> +	return 0;
> +}
> +
> +int vidioc_enum_input(struct file *file, void *priv, struct v4l2_input *input)
> +{
> +	if (input->index != 0)
> +		return -EINVAL;
> +
> +	input->type = V4L2_INPUT_TYPE_CAMERA;
> +	input->std = V4L2_STD_ALL;	/* Not sure what should go here */
> +	strcpy(input->name, "Camera");
> +	return 0;
> +}
> +
> +int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
> +{
> +	*i = 0;
> +	return 0;
> +}
> +
> +int vidioc_s_input(struct file *file, void *priv, unsigned int i)
> +{
> +	if (i != 0)
> +		return -EINVAL;
> +	return 0;
> +}
> +
> +int vidioc_g_std(struct file *file, void *fh, v4l2_std_id *norm)
> +{
> +	*norm = V4L2_STD_NTSC_M;
> +	return 0;
> +}
> +
> +int vidioc_s_std(struct file *file, void *fh, v4l2_std_id a)
> +{
> +	return 0;
> +}
> +
> +static int
> +vid_dev_pipeline_validate(struct video_device_dev *vid_dev)
> +{
> +	return 0;
> +}
> +
> +static int
> +vid_dev_streamon(struct file *file, void *priv, enum v4l2_buf_type type)
> +{
> +	struct video_device_dev *vid_dev = video_drvdata(file);
> +	struct media_entity *entity = &vid_dev->ve.vdev.entity;
> +	int ret;
> +
> +	ret = media_entity_pipeline_start(entity, &vid_dev->ve.pipe->mp);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = vid_dev_pipeline_validate(vid_dev);
> +	if (ret < 0)
> +		goto err_p_stop;
> +
> +	vb2_ioctl_streamon(file, priv, type);
> +	if (!ret)
> +		return ret;
> +
> +err_p_stop:
> +	media_entity_pipeline_stop(entity);
> +	return 0;
> +}
> +
> +static int
> +vid_dev_streamoff(struct file *file, void *priv, enum v4l2_buf_type type)
> +{
> +	struct video_device_dev *vid_dev = video_drvdata(file);
> +	int ret;
> +
> +	ret = vb2_ioctl_streamoff(file, priv, type);
> +	if (ret < 0)
> +		return ret;
> +
> +	media_entity_pipeline_stop(&vid_dev->ve.vdev.entity);
> +	return 0;
> +}
> +
> +static const struct v4l2_ioctl_ops vid_dev_ioctl_ops = {
> +	.vidioc_querycap = vidioc_querycap,
> +	.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
> +	.vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
> +	.vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
> +	.vidioc_enum_framesizes = vidioc_enum_framesizes,
> +	.vidioc_enum_input = vidioc_enum_input,
> +	.vidioc_g_input = vidioc_g_input,
> +	.vidioc_s_input = vidioc_s_input,
> +
> +	.vidioc_reqbufs = vb2_ioctl_reqbufs,
> +	.vidioc_create_bufs = vb2_ioctl_create_bufs,
> +	.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
> +	.vidioc_querybuf = vb2_ioctl_querybuf,
> +	.vidioc_qbuf = vb2_ioctl_qbuf,
> +	.vidioc_dqbuf = vb2_ioctl_dqbuf,
> +	.vidioc_streamon = vid_dev_streamon,
> +	.vidioc_streamoff = vid_dev_streamoff,
> +};
> +
> +/* Capture subdev media entity operations */
> +static int
> +vid_dev_link_setup(struct media_entity *entity,
> +		   const struct media_pad *local,
> +		   const struct media_pad *remote, u32 flags)
> +{
> +	return 0;
> +}
> +
> +static const struct media_entity_operations vid_dev_subdev_media_ops = {
> +	.link_setup = vid_dev_link_setup,
> +};
> +
> +static int
> +vid_dev_open(struct file *file)
> +{
> +	struct video_device_dev *vid_dev = video_drvdata(file);
> +	struct media_entity *me = &vid_dev->ve.vdev.entity;
> +	int ret;
> +
> +	mutex_lock(&vid_dev->lock);
> +
> +	ret = v4l2_fh_open(file);
> +	if (ret < 0)
> +		goto unlock;
> +
> +	if (!v4l2_fh_is_singular_file(file))
> +		goto unlock;
> +
> +	mutex_lock(&me->graph_obj.mdev->graph_mutex);
> +
> +	ret = plat_ipk_pipeline_call(&vid_dev->ve, open, me, true);
> +	if (ret == 0)
> +		me->use_count++;
> +
> +	mutex_unlock(&me->graph_obj.mdev->graph_mutex);
> +
> +	if (!ret)
> +		goto unlock;
> +
> +	v4l2_fh_release(file);
> +unlock:
> +	mutex_unlock(&vid_dev->lock);
> +	return ret;
> +}
> +
> +static int
> +vid_dev_release(struct file *file)
> +{
> +	struct video_device_dev *vid_dev = video_drvdata(file);
> +	struct media_entity *entity = &vid_dev->ve.vdev.entity;
> +
> +	mutex_lock(&vid_dev->lock);
> +
> +	if (v4l2_fh_is_singular_file(file)) {
> +		plat_ipk_pipeline_call(&vid_dev->ve, close);
> +		mutex_lock(&entity->graph_obj.mdev->graph_mutex);
> +		entity->use_count--;
> +		mutex_unlock(&entity->graph_obj.mdev->graph_mutex);
> +	}
> +
> +	_vb2_fop_release(file, NULL);
> +
> +	mutex_unlock(&vid_dev->lock);
> +	return 0;
> +}
> +
> +static const struct v4l2_file_operations vid_dev_fops = {
> +	.owner = THIS_MODULE,
> +	.open = vid_dev_open,
> +	.release = vid_dev_release,
> +	.write = vb2_fop_write,
> +	.read = vb2_fop_read,
> +	.poll = vb2_fop_poll,
> +	.unlocked_ioctl = video_ioctl2,
> +	.mmap = vb2_fop_mmap,
> +};
> +
> +/*
> + * VideoBuffer2 operations
> + */
> +
> +void fill_buffer(struct video_device_dev *dev, struct rx_buffer *buf,
> +			int buf_num, unsigned long flags)
> +{
> +	int size = 0;
> +	void *vbuf = NULL;
> +
> +	if (&buf->vb == NULL)
> +		return;
> +
> +	size = vb2_plane_size(&buf->vb.vb2_buf, 0);
> +	vbuf = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
> +
> +	if (vbuf) {
> +		spin_unlock_irqrestore(&dev->slock, flags);
> +
> +		memcpy(vbuf, dev->dma_buf[buf_num].cpu_addr, size);
> +
> +		spin_lock_irqsave(&dev->slock, flags);
> +
> +		buf->vb.field = dev->format.fmt.pix.field;
> +		buf->vb.sequence++;
> +		buf->vb.vb2_buf.timestamp = ktime_get_ns();
> +	}
> +	vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
> +}
> +
> +static void buffer_copy_process(void *param)
> +{
> +	struct video_device_dev *dev = (struct video_device_dev *) param;
> +	unsigned long flags;
> +	struct dmaqueue *dma_q = &dev->vidq;
> +	struct rx_buffer *buf = NULL;
> +
> +	spin_lock_irqsave(&dev->slock, flags);
> +
> +	if (!list_empty(&dma_q->active)) {
> +		buf = list_entry(dma_q->active.next, struct rx_buffer, list);
> +		list_del(&buf->list);
> +		fill_buffer(dev, buf, dev->last_idx, flags);
> +	}
> +
> +	spin_unlock_irqrestore(&dev->slock, flags);
> +}
> +
> +static inline struct rx_buffer *to_rx_buffer(struct vb2_v4l2_buffer *vb2)
> +{
> +	return container_of(vb2, struct rx_buffer, vb);
> +}
> +
> +int queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
> +			unsigned int *nplanes, unsigned int sizes[],
> +			struct device *alloc_devs[])
> +{
> +	struct video_device_dev *dev = vb2_get_drv_priv(vq);
> +	unsigned long size = 0;
> +	int i;
> +
> +	size = size_image(dev);
> +	if (size == 0)
> +		return -EINVAL;
> +
> +	*nbuffers = N_BUFFERS;
> +
> +	for (i = 0; i < N_BUFFERS; i++) {
> +		dev->dma_buf[i].cpu_addr = dma_alloc_coherent(&dev->pdev->dev,
> +							      size_image(dev),
> +							      &dev->
> +							      dma_buf
> +							      [i].dma_addr,
> +							      GFP_KERNEL);
> +	}
> +
> +	*nplanes = 1;
> +	sizes[0] = size;
> +
> +	return 0;
> +}
> +
> +int buffer_prepare(struct vb2_buffer *vb)
> +{
> +	struct rx_buffer *buf = NULL;
> +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> +	int size = 0;
> +
> +	if (vb == NULL) {
> +		pr_warn("%s:vb2_buffer is null\n", FUNC_NAME);
> +		return 0;
> +	}
> +
> +	buf = to_rx_buffer(vbuf);
> +
> +	size = vb2_plane_size(&buf->vb.vb2_buf, 0);
> +	vb2_set_plane_payload(&buf->vb.vb2_buf, 0, size);
> +
> +	INIT_LIST_HEAD(&buf->list);
> +	return 0;
> +}
> +
> +void buffer_queue(struct vb2_buffer *vb)
> +{
> +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> +	struct video_device_dev *dev = NULL;
> +	struct rx_buffer *buf = NULL;
> +	struct dmaqueue *vidq = NULL;
> +	struct dma_async_tx_descriptor *desc;
> +	u32 flags;
> +
> +	if (vb == NULL) {
> +		pr_warn("%s:vb2_buffer is null\n", FUNC_NAME);
> +		return;
> +	}
> +
> +	dev = vb2_get_drv_priv(vb->vb2_queue);
> +	buf = to_rx_buffer(vbuf);
> +	vidq = &dev->vidq;
> +
> +	flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
> +	dev->xt.dir = DMA_DEV_TO_MEM;
> +	dev->xt.src_sgl = false;
> +	dev->xt.dst_inc = false;
> +	dev->xt.dst_sgl = true;
> +	dev->xt.dst_start = dev->dma_buf[dev->idx].dma_addr;
> +
> +	dev->last_idx = dev->idx;
> +	dev->idx++;
> +	if (dev->idx >= N_BUFFERS)
> +		dev->idx = 0;
> +
> +	dev->xt.frame_size = 1;
> +	dev->sgl[0].size = bytes_per_line(dev);
> +	dev->sgl[0].icg = 0;
> +	dev->xt.numf = height(dev);
> +
> +	desc = dmaengine_prep_interleaved_dma(dev->dma, &dev->xt, flags);
> +	if (!desc) {
> +		pr_err("Failed to prepare DMA transfer\n");
> +		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
> +		return;
> +	}
> +
> +	desc->callback = buffer_copy_process;
> +	desc->callback_param = dev;
> +
> +	spin_lock(&dev->slock);
> +	list_add_tail(&buf->list, &vidq->active);
> +	spin_unlock(&dev->slock);
> +
> +	dmaengine_submit(desc);
> +
> +	if (vb2_is_streaming(&dev->vb_queue))
> +		dma_async_issue_pending(dev->dma);
> +}
> +
> +int start_streaming(struct vb2_queue *vq, unsigned int count)
> +{
> +	struct video_device_dev *dev = vb2_get_drv_priv(vq);
> +
> +	dma_async_issue_pending(dev->dma);
> +
> +	return 0;
> +}
> +
> +void stop_streaming(struct vb2_queue *vq)
> +{
> +	struct video_device_dev *dev = vb2_get_drv_priv(vq);
> +	struct dmaqueue *dma_q = &dev->vidq;
> +
> +	/* Stop and reset the DMA engine. */
> +	dmaengine_terminate_all(dev->dma);
> +
> +	while (!list_empty(&dma_q->active)) {
> +		struct rx_buffer *buf;
> +
> +		buf = list_entry(dma_q->active.next, struct rx_buffer, list);
> +		if (buf) {
> +			list_del(&buf->list);
> +			vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
> +		}
> +	}
> +	list_del_init(&dev->vidq.active);
> +}
> +
> +static const struct vb2_ops vb2_video_qops = {
> +	.queue_setup = queue_setup,
> +	.buf_prepare = buffer_prepare,
> +	.buf_queue = buffer_queue,
> +	.start_streaming = start_streaming,
> +	.stop_streaming = stop_streaming,
> +	.wait_prepare = vb2_ops_wait_prepare,
> +	.wait_finish = vb2_ops_wait_finish,
> +};
> +
> +static int vid_dev_subdev_s_power(struct v4l2_subdev *sd, int on)
> +{
> +	return 0;

I think you could just omit defining the function if it does nothing. The
same goes for core ops.

> +}
> +
> +static int vid_dev_subdev_registered(struct v4l2_subdev *sd)
> +{
> +	struct video_device_dev *vid_dev = v4l2_get_subdevdata(sd);
> +	struct vb2_queue *q = &vid_dev->vb_queue;
> +	struct video_device *vfd = &vid_dev->ve.vdev;
> +	int ret;
> +
> +	memset(vfd, 0, sizeof(*vfd));
> +
> +	snprintf(vfd->name, sizeof(vfd->name), VIDEO_DEVICE_NAME);

How about strlcpy()?

> +
> +	vfd->fops = &vid_dev_fops;
> +	vfd->ioctl_ops = &vid_dev_ioctl_ops;
> +	vfd->v4l2_dev = sd->v4l2_dev;
> +	vfd->minor = -1;
> +	vfd->release = video_device_release_empty;
> +	vfd->queue = q;
> +
> +	INIT_LIST_HEAD(&vid_dev->vidq.active);
> +	init_waitqueue_head(&vid_dev->vidq.wq);
> +	memset(q, 0, sizeof(*q));
> +	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> +	q->io_modes = VB2_MMAP | VB2_USERPTR;
> +	q->ops = &vb2_video_qops;
> +	q->mem_ops = &vb2_vmalloc_memops;
> +	q->buf_struct_size = sizeof(struct rx_buffer);
> +	q->drv_priv = vid_dev;
> +	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
> +	q->lock = &vid_dev->lock;
> +
> +	ret = vb2_queue_init(q);
> +	if (ret < 0)
> +		return ret;
> +
> +	vid_dev->vd_pad.flags = MEDIA_PAD_FL_SINK;
> +	ret = media_entity_pads_init(&vfd->entity, 1, &vid_dev->vd_pad);
> +	if (ret < 0)
> +		return ret;
> +
> +	video_set_drvdata(vfd, vid_dev);
> +	vid_dev->ve.pipe = v4l2_get_subdev_hostdata(sd);
> +
> +	ret = video_register_device(vfd, VFL_TYPE_GRABBER, -1);
> +	if (ret < 0) {
> +		media_entity_cleanup(&vfd->entity);
> +		vid_dev->ve.pipe = NULL;
> +		return ret;
> +	}
> +
> +	v4l2_info(sd->v4l2_dev, "Registered %s as /dev/%s\n",
> +		  vfd->name, video_device_node_name(vfd));
> +	return 0;
> +}
> +
> +static void vid_dev_subdev_unregistered(struct v4l2_subdev *sd)
> +{
> +	struct video_device_dev *vid_dev = v4l2_get_subdevdata(sd);
> +
> +	if (vid_dev == NULL)
> +		return;

Can this happen?

> +
> +	mutex_lock(&vid_dev->lock);
> +
> +	if (video_is_registered(&vid_dev->ve.vdev)) {
> +		video_unregister_device(&vid_dev->ve.vdev);
> +		media_entity_cleanup(&vid_dev->ve.vdev.entity);
> +		vid_dev->ve.pipe = NULL;
> +	}
> +
> +	mutex_unlock(&vid_dev->lock);
> +}
> +
> +static const struct v4l2_subdev_internal_ops vid_dev_subdev_internal_ops = {
> +	.registered = vid_dev_subdev_registered,
> +	.unregistered = vid_dev_subdev_unregistered,
> +};
> +
> +static const struct v4l2_subdev_core_ops vid_dev_subdev_core_ops = {
> +	.s_power = vid_dev_subdev_s_power,
> +};
> +
> +static struct v4l2_subdev_ops vid_dev_subdev_ops = {
> +	.core = &vid_dev_subdev_core_ops,
> +};
> +
> +static int vid_dev_create_capture_subdev(struct video_device_dev *vid_dev)
> +{
> +	struct v4l2_subdev *sd = &vid_dev->subdev;
> +	int ret;
> +
> +	v4l2_subdev_init(sd, &vid_dev_subdev_ops);
> +	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> +	snprintf(sd->name, sizeof(sd->name), "Capture device");
> +
> +	vid_dev->subdev_pads[VIDEO_DEV_SD_PAD_SINK_CSI].flags =
> +		MEDIA_PAD_FL_SOURCE;
> +	vid_dev->subdev_pads[VIDEO_DEV_SD_PAD_SOURCE_DMA].flags =
> +		MEDIA_PAD_FL_SINK;
> +	ret =

No need for a line break.

> +	    media_entity_pads_init(&sd->entity, VIDEO_DEV_SD_PADS_NUM,
> +				   vid_dev->subdev_pads);
> +	if (ret)
> +		return ret;
> +
> +	sd->internal_ops = &vid_dev_subdev_internal_ops;
> +	sd->entity.ops = &vid_dev_subdev_media_ops;
> +	sd->owner = THIS_MODULE;
> +	v4l2_set_subdevdata(sd, vid_dev);
> +
> +	return 0;
> +}
> +
> +static void vid_dev_unregister_subdev(struct video_device_dev *vid_dev)
> +{
> +	struct v4l2_subdev *sd = &vid_dev->subdev;
> +
> +	v4l2_device_unregister_subdev(sd);
> +	media_entity_cleanup(&sd->entity);
> +	v4l2_set_subdevdata(sd, NULL);
> +}
> +
> +static const struct of_device_id vid_dev_of_match[];
> +
> +static int vid_dev_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	const struct of_device_id *of_id;
> +	int ret = 0;
> +	struct video_device_dev *vid_dev;
> +
> +	dev_info(dev, "Installing IPK Video Device module\n");
> +
> +	if (!dev->of_node)
> +		return -ENODEV;
> +
> +	vid_dev = devm_kzalloc(dev, sizeof(*vid_dev), GFP_KERNEL);
> +	if (!vid_dev)
> +		return -ENOMEM;
> +
> +	of_id = of_match_node(vid_dev_of_match, dev->of_node);
> +	if (WARN_ON(of_id == NULL))
> +		return -EINVAL;
> +
> +	vid_dev->pdev = pdev;
> +
> +	spin_lock_init(&vid_dev->slock);
> +	mutex_init(&vid_dev->lock);
> +
> +	dev_info(&pdev->dev, "Requesting DMA\n");
> +	vid_dev->dma = dma_request_slave_channel(&pdev->dev, "vdma0");
> +	if (vid_dev->dma == NULL) {
> +		dev_err(&pdev->dev, "no VDMA channel found\n");
> +		ret = -ENODEV;
> +		goto end;
> +	}
> +
> +	ret = vid_dev_create_capture_subdev(vid_dev);
> +	if (ret)
> +		goto end;
> +
> +	platform_set_drvdata(pdev, vid_dev);
> +
> +	dev_info(dev, "Video Device registered successfully\n");
> +	return 0;
> +end:
> +	dev_err(dev, "Video Device not registered!!\n");
> +	return ret;
> +}
> +
> +static int vid_dev_remove(struct platform_device *pdev)
> +{
> +	struct video_device_dev *dev = platform_get_drvdata(pdev);
> +
> +	vid_dev_unregister_subdev(dev);
> +	dev_info(&pdev->dev, "Driver removed\n");
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id vid_dev_of_match[] = {
> +	{.compatible = "snps,video-device"},
> +	{}
> +};
> +
> +MODULE_DEVICE_TABLE(of, vid_dev_of_match);
> +
> +static struct platform_driver __refdata vid_dev_pdrv = {
> +	.remove = vid_dev_remove,
> +	.probe = vid_dev_probe,
> +	.driver = {
> +		   .name = VIDEO_DEVICE_NAME,
> +		   .owner = THIS_MODULE,
> +		   .of_match_table = vid_dev_of_match,
> +		   },
> +};
> +
> +module_platform_driver(vid_dev_pdrv);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Ramiro Oliveira <roliveir@synopsys.com>");
> +MODULE_DESCRIPTION("Driver for configuring DMA and Video Device");
> diff --git a/drivers/media/platform/dwc/video_device.h b/drivers/media/platform/dwc/video_device.h
> new file mode 100644
> index 0000000..e828d4b
> --- /dev/null
> +++ b/drivers/media/platform/dwc/video_device.h
> @@ -0,0 +1,101 @@
> +/*
> + * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef VIDEO_DEVICE_H_
> +#define VIDEO_DEVICE_H_
> +
> +#include <linux/module.h>
> +#include <linux/errno.h>
> +#include <linux/kernel.h>
> +#include <linux/types.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/of_irq.h>
> +#include <linux/delay.h>
> +#include <linux/list.h>
> +#include <linux/wait.h>
> +#include <linux/string.h>
> +#include <linux/videodev2.h>
> +#include <linux/dma/xilinx_dma.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/v4l2-fh.h>
> +#include <media/v4l2-common.h>
> +#include <media/videobuf2-vmalloc.h>
> +#include <media/media-entity.h>
> +#include <linux/io.h>
> +
> +#include "plat_ipk_video.h"
> +
> +#define N_BUFFERS 3
> +
> +#define VIDEO_DEVICE_NAME	"video-device"
> +
> +#define FUNC_NAME __func__
> +
> +struct rx_buffer {
> +	/** @short Buffer for video frames */
> +	struct vb2_v4l2_buffer vb;
> +	struct list_head list;
> +
> +	dma_addr_t dma_addr;
> +	void *cpu_addr;
> +};
> +
> +struct dmaqueue {
> +	struct list_head active;
> +	wait_queue_head_t wq;
> +};
> +
> +/**
> + * @short Structure to embed device driver information
> + */
> +struct video_device_dev {
> +	struct platform_device *pdev;
> +	struct v4l2_device *v4l2_dev;
> +	struct v4l2_subdev subdev;
> +	struct media_pad vd_pad;
> +	struct media_pad subdev_pads[VIDEO_DEV_SD_PADS_NUM];
> +	struct mutex lock;
> +	spinlock_t slock;
> +	struct plat_ipk_video_entity ve;
> +	struct v4l2_format format;
> +	struct v4l2_pix_format pix_format;
> +	const struct plat_ipk_fmt *fmt;
> +	unsigned long *alloc_ctx;
> +
> +	/* Buffer and DMA */
> +	struct vb2_queue vb_queue;
> +	int idx;
> +	int last_idx;
> +	struct dmaqueue vidq;
> +	struct rx_buffer dma_buf[N_BUFFERS];
> +	struct dma_chan *dma;
> +	struct dma_interleaved_template xt;
> +	struct data_chunk sgl[1];
> +};
> +
> +/**
> + * @short Defines to simplify the code reading
> + */
> +
> +#define pixel_format(dev)	\
> +	dev->format.fmt.pix.pixelformat
> +#define bytes_per_line(dev)	\
> +	dev->format.fmt.pix.bytesperline
> +#define width(dev)		\
> +	dev->format.fmt.pix.width
> +#define height(dev)		\
> +	dev->format.fmt.pix.height
> +#define size_image(dev)		\
> +	dev->format.fmt.pix.sizeimage

How about referring to the field directly, or define a local variable for a
pointer to dev->format.fmt.fix in functions it's needed.

> +
> +const struct plat_ipk_fmt *vid_dev_find_format(struct v4l2_format *f,
> +					       int index);
> +
> +#endif				/* VIDEO_DEVICE_H_ */

-- 
Kind regards,

Sakari Ailus
e-mail: sakari.ailus@iki.fi	XMPP: sailus@retiisi.org.uk

Re: [PATCH 2/2] Add basic support for DW CSI-2 Host IPK

[Ramiro Oliveira]

Hi Sakari,

Thank you for your feedback.

On 11/17/2016 4:34 PM, Sakari Ailus wrote:
> Hi Ramiro,
> 
> Thank you for the patchset. Please see my comments below.
> 
> If you've got a CSI-2 receiver, why do you use the DV timing presets? What
> do you use those for?
> 

Our CSI-2 Host has two different output types, one that doesn't need any extra
info about the video timings, and one that needs some info about the input video
timings. Since the video timings of any input (Camera) should be somewhat
similar to the DV timing presets I decided to use them.

I'm not sure if this answers your question.

> On Mon, Nov 14, 2016 at 02:20:23PM +0000, Ramiro Oliveira wrote:
>> Add support for basic configuration of the DW CSI-2 Host IPK
>>
>> Signed-off-by: Ramiro Oliveira <roliveir@synopsys.com>
>> ---
>>  MAINTAINERS                                 |   7 +
>>  drivers/media/platform/Kconfig              |   1 +
>>  drivers/media/platform/Makefile             |   2 +
>>  drivers/media/platform/dwc/Kconfig          |  36 ++
>>  drivers/media/platform/dwc/Makefile         |   3 +
>>  drivers/media/platform/dwc/dw_mipi_csi.c    | 687 +++++++++++++++++++++++
>>  drivers/media/platform/dwc/dw_mipi_csi.h    | 179 ++++++
>>  drivers/media/platform/dwc/plat_ipk.c       | 835 ++++++++++++++++++++++++++++
>>  drivers/media/platform/dwc/plat_ipk.h       |  97 ++++
>>  drivers/media/platform/dwc/plat_ipk_video.h |  97 ++++
>>  drivers/media/platform/dwc/video_device.c   | 741 ++++++++++++++++++++++++
>>  drivers/media/platform/dwc/video_device.h   | 101 ++++
>>  12 files changed, 2786 insertions(+)
>>  create mode 100644 drivers/media/platform/dwc/Kconfig
>>  create mode 100644 drivers/media/platform/dwc/Makefile
>>  create mode 100644 drivers/media/platform/dwc/dw_mipi_csi.c
>>  create mode 100644 drivers/media/platform/dwc/dw_mipi_csi.h
>>  create mode 100644 drivers/media/platform/dwc/plat_ipk.c
>>  create mode 100644 drivers/media/platform/dwc/plat_ipk.h
>>  create mode 100644 drivers/media/platform/dwc/plat_ipk_video.h
>>  create mode 100644 drivers/media/platform/dwc/video_device.c
>>  create mode 100644 drivers/media/platform/dwc/video_device.h
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 6a71422..f54dfd8 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -10618,6 +10618,13 @@ S:	Maintained
>>  F:	drivers/staging/media/st-cec/
>>  F:	Documentation/devicetree/bindings/media/stih-cec.txt
>>  
>> +SYNOPSYS DESIGNWARE CSI-2 HOST IPK DRIVER
>> +M:	Ramiro Oliveira <roliveir@synopsys.com>
>> +L:	linux-media@vger.kernel.org
>> +T:	git git://linuxtv.org/media_tree.git
>> +S:	Maintained
>> +F:	drivers/media/platform/dwc/
>> +
>>  SYNOPSYS DESIGNWARE DMAC DRIVER
>>  M:	Viresh Kumar <vireshk@kernel.org>
>>  M:	Andy Shevchenko <andriy.shevchenko@linux.intel.com>
>> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
>> index 754edbf1..6fef760f 100644
>> --- a/drivers/media/platform/Kconfig
>> +++ b/drivers/media/platform/Kconfig
>> @@ -120,6 +120,7 @@ source "drivers/media/platform/am437x/Kconfig"
>>  source "drivers/media/platform/xilinx/Kconfig"
>>  source "drivers/media/platform/rcar-vin/Kconfig"
>>  source "drivers/media/platform/atmel/Kconfig"
>> +source "drivers/media/platform/dwc/Kconfig"
>>  
>>  config VIDEO_TI_CAL
>>  	tristate "TI CAL (Camera Adaptation Layer) driver"
>> diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
>> index f842933..623f5d2 100644
>> --- a/drivers/media/platform/Makefile
>> +++ b/drivers/media/platform/Makefile
>> @@ -61,6 +61,8 @@ obj-$(CONFIG_VIDEO_RCAR_VIN)		+= rcar-vin/
>>  
>>  obj-$(CONFIG_VIDEO_ATMEL_ISC)		+= atmel/
>>  
>> +obj-$(CONFIG_VIDEO_DWC)			+= dwc/
>> +
>>  ccflags-y += -I$(srctree)/drivers/media/i2c
>>  
>>  obj-$(CONFIG_VIDEO_MEDIATEK_VPU)	+= mtk-vpu/
>> diff --git a/drivers/media/platform/dwc/Kconfig b/drivers/media/platform/dwc/Kconfig
>> new file mode 100644
>> index 0000000..fb8533b
>> --- /dev/null
>> +++ b/drivers/media/platform/dwc/Kconfig
>> @@ -0,0 +1,36 @@
>> +config VIDEO_DWC
>> +	bool "Designware Cores CSI-2 IPK (EXPERIMENTAL)"
>> +	depends on VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API && OF && HAS_DMA
>> +	help
>> +	  Say Y here to enable support for the DesignWare Cores CSI-2 Host IP
>> +	  Prototyping Kit.
>> +
>> +if VIDEO_DWC
>> +config DWC_PLATFORM
>> +	tristate "SNPS DWC MIPI CSI2 Host"
>> +	depends on VIDEO_DWC
>> +	help
>> +	  This is the V4L2 plaftorm driver driver for the DWC CSI-2 HOST IPK
>> +
>> +	  To compile this driver as a module, choose M here
>> +
>> +
>> +config DWC_MIPI_CSI2_HOST
>> +	tristate "SNPS DWC MIPI CSI2 Host"
>> +	select GENERIC_PHY
>> +	depends on VIDEO_DWC
>> +	help
>> +	  This is a V4L2 driver for SNPS DWC MIPI-CSI2
>> +
>> +	  To compile this driver as a module, choose M here
>> +
>> +config DWC_VIDEO_DEVICE
>> +	tristate "DWC VIDEO DEVICE"
>> +	select VIDEOBUF2_VMALLOC
>> +	select VIDEOBUF2_DMA_CONTIG
>> +	depends on VIDEO_DWC
>> +	help
>> +	  This is a V4L2 driver for SNPS Video device
>> +	  To compile this driver as a module, choose M here
>> +
>> +endif # VIDEO_DWC
>> diff --git a/drivers/media/platform/dwc/Makefile b/drivers/media/platform/dwc/Makefile
>> new file mode 100644
>> index 0000000..75c74b7
>> --- /dev/null
>> +++ b/drivers/media/platform/dwc/Makefile
>> @@ -0,0 +1,3 @@
>> +obj-$(CONFIG_DWC_PLATFORM)		+= plat_ipk.o
>> +obj-$(CONFIG_DWC_MIPI_CSI2_HOST)	+= dw_mipi_csi.o
>> +obj-$(CONFIG_DWC_VIDEO_DEVICE)		+= video_device.o
>> diff --git a/drivers/media/platform/dwc/dw_mipi_csi.c b/drivers/media/platform/dwc/dw_mipi_csi.c
>> new file mode 100644
>> index 0000000..1337a5e
>> --- /dev/null
>> +++ b/drivers/media/platform/dwc/dw_mipi_csi.c
>> @@ -0,0 +1,687 @@
>> +/*
>> + * DWC MIPI CSI-2 Host device driver
>> + *
>> + * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
>> + * Author: Ramiro Oliveira <ramiro.oliveira@synopsys.com>
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License as published
>> + * by the Free Software Foundation, either version 2 of the License,
>> + * or (at your option) any later version.
>> + */
>> +
>> +
>> +#include "dw_mipi_csi.h"
>> +
>> +/** @short Driver args: debug */
>> +static unsigned int debug;
>> +module_param(debug, uint, 0644);
>> +MODULE_PARM_DESC(debug, "Activates debug info");
> 
> There should be no need for module specific debug parameters. Please use
> dynamic debug instead.
> 

I'll remove it.

>> +
>> +/*
>> + * Basic IO read and write operations
>> + */
>> +
>> +/**
>> + * @short Video formats supported by the MIPI CSI-2
>> + */
>> +static const struct mipi_fmt dw_mipi_csi_formats[] = {
>> +	{
>> +	 .name = "RAW BGGR 8",
> 
> Do you use the name field for something? If not, I'd suggest to drop it.
> 

No, I guess I don't really use it for anything. I'll remove it.

>> +	 .code = MEDIA_BUS_FMT_SBGGR8_1X8,
>> +	 .depth = 8,
>> +	 },
>> +	{
>> +	 .name = "RAW10",
>> +	 .code = MEDIA_BUS_FMT_SBGGR10_2X8_PADHI_BE,
>> +	 .depth = 10,
>> +	 },
>> +	{
>> +	 .name = "RGB565",
>> +	 .code = MEDIA_BUS_FMT_RGB565_2X8_BE,
>> +	 .depth = 16,
>> +	 },
>> +	{
>> +	 .name = "BGR565",
>> +	 .code = MEDIA_BUS_FMT_RGB565_2X8_LE,
>> +	 .depth = 16,
>> +	 },
>> +	{
>> +	 .name = "RGB888",
>> +	 .code = MEDIA_BUS_FMT_RGB888_2X12_LE,
>> +	 .depth = 24,
>> +	 },
>> +	{
>> +	 .name = "BGR888",
>> +	 .code = MEDIA_BUS_FMT_RGB888_2X12_BE,
>> +	 .depth = 24,
>> +	 },
>> +};
>> +
>> +static struct mipi_csi_dev *
>> +sd_to_mipi_csi_dev(struct v4l2_subdev *sdev)
>> +{
>> +	return container_of(sdev, struct mipi_csi_dev, sd);
>> +}
>> +
>> +void
>> +dw_mipi_csi_write(struct mipi_csi_dev *dev,
>> +		  unsigned int address, unsigned int data)
>> +{
>> +	iowrite32(data, dev->base_address + address);
>> +}
>> +
>> +u32
>> +dw_mipi_csi_read(struct mipi_csi_dev *dev, unsigned long address)
>> +{
>> +	return ioread32(dev->base_address + address);
>> +}
>> +
>> +void
>> +dw_mipi_csi_write_part(struct mipi_csi_dev *dev,
>> +		       unsigned long address, unsigned long data,
>> +		       unsigned char shift, unsigned char width)
>> +{
>> +	u32 mask = (1 << width) - 1;
>> +	u32 temp = dw_mipi_csi_read(dev, address);
>> +
>> +	temp &= ~(mask << shift);
>> +	temp |= (data & mask) << shift;
>> +	dw_mipi_csi_write(dev, address, temp);
>> +}
>> +
>> +static const struct mipi_fmt *
>> +find_dw_mipi_csi_format(struct v4l2_mbus_framefmt *mf)
>> +{
>> +	int i;
> 
> unsigned int
> 

I'll change it.

>> +
>> +	for (i = 0; i < ARRAY_SIZE(dw_mipi_csi_formats); i++)
>> +		if (mf->code == dw_mipi_csi_formats[i].code)
>> +			return &dw_mipi_csi_formats[i];
>> +	return NULL;
>> +}
>> +
>> +int
>> +enable_video_output(struct mipi_csi_dev *dev)
>> +{
>> +	return 0;
>> +}
> 
> This one is unused.
> 
>> +
>> +int
>> +disable_video_output(struct mipi_csi_dev *dev)
>> +{
>> +	phy_power_off(dev->phy);
>> +	return 0;
>> +}
> 
> This one as well.
> 

I'll remove both.

>> +
>> +static void
>> +dw_mipi_csi_reset(struct mipi_csi_dev *dev)
>> +{
>> +	dw_mipi_csi_write(dev, R_CSI2_CTRL_RESETN, 0);
>> +	/* mdelay(1); */
>> +	dw_mipi_csi_write(dev, R_CSI2_CTRL_RESETN, 1);
>> +}
>> +
>> +static int
>> +dw_mipi_csi_mask_irq_power_off(struct mipi_csi_dev *dev)
>> +{
>> +	/* set only one lane (lane 0) as active (ON) */
>> +	dw_mipi_csi_write(dev, R_CSI2_N_LANES, 0);
>> +
>> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PHY_FATAL, 0);
>> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PKT_FATAL, 0);
>> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_FRAME_FATAL, 0);
>> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PHY, 0);
>> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PKT, 0);
>> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_LINE, 0);
>> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_IPI, 0);
>> +
>> +	dw_mipi_csi_write(dev, R_CSI2_CTRL_RESETN, 0);
>> +
>> +	return 0;
>> +
>> +}
>> +
>> +static int
>> +dw_mipi_csi_hw_stdby(struct mipi_csi_dev *dev)
>> +{
>> +	/* set only one lane (lane 0) as active (ON) */
>> +	dw_mipi_csi_reset(dev);
>> +
>> +	dw_mipi_csi_write(dev, R_CSI2_N_LANES, 0);
>> +
>> +	phy_init(dev->phy);
>> +
>> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PHY_FATAL, 0xFFFFFFFF);
>> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PKT_FATAL, 0xFFFFFFFF);
>> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_FRAME_FATAL, 0xFFFFFFFF);
>> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PHY, 0xFFFFFFFF);
>> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_PKT, 0xFFFFFFFF);
>> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_LINE, 0xFFFFFFFF);
>> +	dw_mipi_csi_write(dev, R_CSI2_MASK_INT_IPI, 0xFFFFFFFF);
>> +
>> +	return 0;
>> +
>> +}
>> +
>> +void
> 
> Shouldn't this be static? The same applies to many other symbols as well.
> 

You're right, I'll change them all.

>> +dw_mipi_csi_set_ipi_fmt(struct mipi_csi_dev *dev)
>> +{
>> +	switch (dev->fmt->code) {
>> +	case MEDIA_BUS_FMT_RGB565_2X8_BE:
>> +	case MEDIA_BUS_FMT_RGB565_2X8_LE:
>> +		dw_mipi_csi_write(dev, R_CSI2_IPI_DATA_TYPE, CSI_2_RGB565);
>> +		v4l2_dbg(1, debug, &dev->sd, "DT: RGB 565");
>> +		break;
>> +
>> +	case MEDIA_BUS_FMT_RGB888_2X12_LE:
>> +	case MEDIA_BUS_FMT_RGB888_2X12_BE:
>> +		dw_mipi_csi_write(dev, R_CSI2_IPI_DATA_TYPE, CSI_2_RGB888);
>> +		v4l2_dbg(1, debug, &dev->sd, "DT: RGB 888");
>> +		break;
>> +	case MEDIA_BUS_FMT_SBGGR10_2X8_PADHI_BE:
>> +		dw_mipi_csi_write(dev, R_CSI2_IPI_DATA_TYPE, CSI_2_RAW10);
>> +		v4l2_dbg(1, debug, &dev->sd, "DT: RAW 10");
>> +		break;
>> +	case MEDIA_BUS_FMT_SBGGR8_1X8:
>> +		dw_mipi_csi_write(dev, R_CSI2_IPI_DATA_TYPE, CSI_2_RAW8);
>> +		v4l2_dbg(1, debug, &dev->sd, "DT: RAW 8");
>> +		break;
>> +	default:
>> +		dw_mipi_csi_write(dev, R_CSI2_IPI_DATA_TYPE, CSI_2_RGB565);
>> +		v4l2_dbg(1, debug, &dev->sd, "Error");
>> +		break;
>> +	}
>> +}
>> +
>> +void
>> +__dw_mipi_csi_fill_timings(struct mipi_csi_dev *dev,
>> +			   const struct v4l2_bt_timings *bt)
>> +{
>> +
>> +	if (bt == NULL)
>> +		return;
>> +
>> +	dev->hw.hsa = bt->hsync;
>> +	dev->hw.hbp = bt->hbackporch;
>> +	dev->hw.hsd = bt->hsync;
>> +	dev->hw.htotal = bt->height + bt->vfrontporch +
>> +	    bt->vsync + bt->vbackporch;
>> +	dev->hw.vsa = bt->vsync;
>> +	dev->hw.vbp = bt->vbackporch;
>> +	dev->hw.vfp = bt->vfrontporch;
>> +	dev->hw.vactive = bt->height;
>> +}
> 
> There seem to be quite a few unused functions here.
> 

I've removed everything that wasn't being used.

>> +
>> +void
>> +dw_mipi_csi_start(struct mipi_csi_dev *dev)
>> +{
>> +	const struct v4l2_bt_timings *bt = &v4l2_dv_timings_presets[0].bt;
>> +
>> +	__dw_mipi_csi_fill_timings(dev, bt);
>> +
>> +	dw_mipi_csi_write(dev, R_CSI2_N_LANES, (dev->hw.num_lanes - 1));
>> +	v4l2_dbg(1, debug, &dev->sd, "N Lanes: %d\n", dev->hw.num_lanes);
>> +
>> +	/*IPI Related Configuration */
>> +	if ((dev->hw.output_type == IPI_OUT)
>> +	    || (dev->hw.output_type == BOTH_OUT)) {
>> +
>> +		dw_mipi_csi_write_part(dev, R_CSI2_IPI_MODE, dev->hw.ipi_mode,
>> +				       0, 1);
>> +		v4l2_dbg(1, debug, &dev->sd, "IPI MODE: %d\n",
>> +			 dev->hw.ipi_mode);
>> +
>> +		dw_mipi_csi_write_part(dev, R_CSI2_IPI_MODE,
>> +				       dev->hw.ipi_color_mode, 8, 1);
>> +		v4l2_dbg(1, debug, &dev->sd, "Color Mode: %d\n",
>> +			 dev->hw.ipi_color_mode);
>> +
>> +		dw_mipi_csi_write(dev, R_CSI2_IPI_VCID, dev->hw.virtual_ch);
>> +		v4l2_dbg(1, debug, &dev->sd, "Virtual Channel: %d\n",
>> +			 dev->hw.virtual_ch);
>> +
>> +		dw_mipi_csi_write_part(dev, R_CSI2_IPI_MEM_FLUSH,
>> +				       dev->hw.ipi_auto_flush, 8, 1);
>> +		v4l2_dbg(1, debug, &dev->sd, "Auto-flush: %d\n",
>> +			 dev->hw.ipi_auto_flush);
>> +
>> +		dw_mipi_csi_write(dev, R_CSI2_IPI_HSA_TIME, dev->hw.hsa);
>> +		v4l2_dbg(1, debug, &dev->sd, "HSA: %d\n", dev->hw.hsa);
>> +
>> +		dw_mipi_csi_write(dev, R_CSI2_IPI_HBP_TIME, dev->hw.hbp);
>> +		v4l2_dbg(1, debug, &dev->sd, "HBP: %d\n", dev->hw.hbp);
>> +
>> +		dw_mipi_csi_write(dev, R_CSI2_IPI_HSD_TIME, dev->hw.hsd);
>> +		v4l2_dbg(1, debug, &dev->sd, "HSD: %d\n", dev->hw.hsd);
>> +
>> +		if (dev->hw.ipi_mode == AUTO_TIMING) {
>> +			dw_mipi_csi_write(dev, R_CSI2_IPI_HLINE_TIME,
>> +					  dev->hw.htotal);
>> +			v4l2_dbg(1, debug, &dev->sd, "H total: %d\n",
>> +				 dev->hw.htotal);
>> +
>> +			dw_mipi_csi_write(dev, R_CSI2_IPI_VSA_LINES,
>> +					  dev->hw.vsa);
>> +			v4l2_dbg(1, debug, &dev->sd, "VSA: %d\n", dev->hw.vsa);
>> +
>> +			dw_mipi_csi_write(dev, R_CSI2_IPI_VBP_LINES,
>> +					  dev->hw.vbp);
>> +			v4l2_dbg(1, debug, &dev->sd, "VBP: %d\n", dev->hw.vbp);
>> +
>> +			dw_mipi_csi_write(dev, R_CSI2_IPI_VFP_LINES,
>> +					  dev->hw.vfp);
>> +			v4l2_dbg(1, debug, &dev->sd, "VFP: %d\n", dev->hw.vfp);
>> +
>> +			dw_mipi_csi_write(dev, R_CSI2_IPI_VACTIVE_LINES,
>> +					  dev->hw.vactive);
>> +			v4l2_dbg(1, debug, &dev->sd, "V Active: %d\n",
>> +				 dev->hw.vactive);
>> +		}
>> +	}
>> +
>> +	phy_power_on(dev->phy);
>> +}
>> +
>> +static int
>> +dw_mipi_csi_enum_mbus_code(struct v4l2_subdev *sd,
>> +			   struct v4l2_subdev_pad_config *cfg,
>> +			   struct v4l2_subdev_mbus_code_enum *code)
>> +{
>> +	if (code->index >= ARRAY_SIZE(dw_mipi_csi_formats))
>> +		return -EINVAL;
>> +
>> +	code->code = dw_mipi_csi_formats[code->index].code;
>> +	return 0;
>> +}
>> +
>> +static struct mipi_fmt const *
>> +dw_mipi_csi_try_format(struct v4l2_mbus_framefmt *mf)
>> +{
>> +	struct mipi_fmt const *fmt;
>> +
>> +	fmt = find_dw_mipi_csi_format(mf);
>> +	if (fmt == NULL)
>> +		fmt = &dw_mipi_csi_formats[0];
>> +
>> +	mf->code = fmt->code;
>> +	return fmt;
>> +}
>> +
>> +static struct v4l2_mbus_framefmt *
>> +__dw_mipi_csi_get_format(struct mipi_csi_dev *dev,
>> +			 struct v4l2_subdev_pad_config *cfg,
>> +			 enum v4l2_subdev_format_whence which)
>> +{
>> +	if (which == V4L2_SUBDEV_FORMAT_TRY)
>> +		return cfg ? v4l2_subdev_get_try_format(&dev->sd, cfg,
>> +							0) : NULL;
>> +
>> +	return &dev->format;
>> +}
>> +
>> +static int
>> +dw_mipi_csi_set_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg,
>> +		    struct v4l2_subdev_format *fmt)
>> +{
>> +	struct mipi_csi_dev *dev = sd_to_mipi_csi_dev(sd);
>> +	struct mipi_fmt const *dev_fmt;
>> +	struct v4l2_mbus_framefmt *mf;
>> +	int i = 0;
> 
> unsigned int
> 

Changing it.

>> +	const struct v4l2_bt_timings *bt_r = &v4l2_dv_timings_presets[0].bt;
>> +
>> +	mf = __dw_mipi_csi_get_format(dev, cfg, fmt->which);
>> +
>> +	dev_fmt = dw_mipi_csi_try_format(&fmt->format);
>> +	if (dev_fmt) {
>> +		*mf = fmt->format;
>> +		if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE)
>> +			dev->fmt = dev_fmt;
>> +		dw_mipi_csi_set_ipi_fmt(dev);
>> +	}
>> +	while (v4l2_dv_timings_presets[i].bt.width) {
>> +		const struct v4l2_bt_timings *bt =
>> +		    &v4l2_dv_timings_presets[i].bt;
>> +		if (mf->width == bt->width && mf->height == bt->width) {
>> +			__dw_mipi_csi_fill_timings(dev, bt);
>> +			return 0;
>> +		}
>> +		i++;
>> +	}
>> +
>> +	__dw_mipi_csi_fill_timings(dev, bt_r);
>> +	return 0;
>> +
>> +}
>> +
>> +static int
>> +dw_mipi_csi_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_pad_config *cfg,
>> +		    struct v4l2_subdev_format *fmt)
>> +{
>> +	struct mipi_csi_dev *dev = sd_to_mipi_csi_dev(sd);
>> +	struct v4l2_mbus_framefmt *mf;
>> +
>> +	mf = __dw_mipi_csi_get_format(dev, cfg, fmt->which);
>> +	if (!mf)
>> +		return -EINVAL;
>> +
>> +	mutex_lock(&dev->lock);
>> +	fmt->format = *mf;
>> +	mutex_unlock(&dev->lock);
>> +	return 0;
>> +}
>> +
>> +static int
>> +dw_mipi_csi_s_power(struct v4l2_subdev *sd, int on)
>> +{
>> +	struct mipi_csi_dev *dev = sd_to_mipi_csi_dev(sd);
>> +
>> +	if (on) {
>> +		dw_mipi_csi_hw_stdby(dev);
>> +		dw_mipi_csi_start(dev);
>> +	} else {
>> +		dw_mipi_csi_mask_irq_power_off(dev);
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int
>> +dw_mipi_csi_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
>> +{
>> +	struct v4l2_mbus_framefmt *format =
>> +	    v4l2_subdev_get_try_format(sd, fh->pad, 0);
>> +
>> +	format->colorspace = V4L2_COLORSPACE_SRGB;
>> +	format->code = dw_mipi_csi_formats[0].code;
>> +	format->width = MIN_WIDTH;
>> +	format->height = MIN_HEIGHT;
>> +	format->field = V4L2_FIELD_NONE;
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct v4l2_subdev_internal_ops dw_mipi_csi_sd_internal_ops = {
>> +	.open = dw_mipi_csi_open,
>> +};
>> +
>> +static struct v4l2_subdev_core_ops dw_mipi_csi_core_ops = {
>> +	.s_power = dw_mipi_csi_s_power,
>> +};
>> +
>> +static struct v4l2_subdev_pad_ops dw_mipi_csi_pad_ops = {
>> +	.enum_mbus_code = dw_mipi_csi_enum_mbus_code,
>> +	.get_fmt = dw_mipi_csi_get_fmt,
>> +	.set_fmt = dw_mipi_csi_set_fmt,
>> +};
>> +
>> +static struct v4l2_subdev_ops dw_mipi_csi_subdev_ops = {
>> +	.core = &dw_mipi_csi_core_ops,
>> +	.pad = &dw_mipi_csi_pad_ops,
>> +};
>> +
>> +static irqreturn_t
>> +dw_mipi_csi_irq1(int irq, void *dev_id)
>> +{
>> +
>> +	struct mipi_csi_dev *dev = dev_id;
>> +	u32 int_status, ind_status;
>> +	unsigned long flags;
>> +
>> +	int_status = dw_mipi_csi_read(dev, R_CSI2_INTERRUPT);
>> +	spin_lock_irqsave(&dev->slock, flags);
>> +
>> +	if (int_status & CSI2_INT_PHY_FATAL) {
>> +		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_PHY_FATAL);
>> +		pr_info_ratelimited("%08X CSI INT PHY FATAL: %08X\n",
>> +				    (uint32_t) dev->base_address, ind_status);
> 
> I don't think you should use pr_info() for interrupts. This is basically
> debug information, isn't it?
> 

Yes. It's useful in testing, but not so much in production. Changing it to debug.

>> +	}
>> +
>> +	if (int_status & CSI2_INT_PKT_FATAL) {
>> +		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_PKT_FATAL);
>> +		pr_info_ratelimited("%08X CSI INT PKT FATAL: %08X\n",
>> +				    (uint32_t) dev->base_address, ind_status);
>> +	}
>> +
>> +	if (int_status & CSI2_INT_FRAME_FATAL) {
>> +		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_FRAME_FATAL);
>> +		pr_info_ratelimited("%08X CSI INT FRAME FATAL: %08X\n",
>> +				    (uint32_t) dev->base_address, ind_status);
>> +	}
>> +
>> +	if (int_status & CSI2_INT_PHY) {
>> +		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_PHY);
>> +		pr_info_ratelimited("%08X CSI INT PHY: %08X\n",
>> +				    (uint32_t) dev->base_address, ind_status);
>> +	}
>> +
>> +	if (int_status & CSI2_INT_PKT) {
>> +		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_PKT);
>> +		pr_info_ratelimited("%08X CSI INT PKT: %08X\n",
>> +				    (uint32_t) dev->base_address, ind_status);
>> +	}
>> +
>> +	if (int_status & CSI2_INT_LINE) {
>> +		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_LINE);
>> +		pr_info_ratelimited("%08X CSI INT LINE: %08X\n",
>> +				    (uint32_t) dev->base_address, ind_status);
>> +	}
>> +
>> +	if (int_status & CSI2_INT_IPI) {
>> +		ind_status = dw_mipi_csi_read(dev, R_CSI2_INT_IPI);
>> +		pr_info_ratelimited("%08X CSI INT IPI: %08X\n",
>> +				    (uint32_t) dev->base_address, ind_status);
>> +	}
>> +	spin_unlock_irqrestore(&dev->slock, flags);
>> +	return IRQ_HANDLED;
>> +}
>> +
>> +static int
>> +dw_mipi_csi_parse_dt(struct platform_device *pdev, struct mipi_csi_dev *dev)
>> +{
>> +	struct device_node *node = pdev->dev.of_node;
>> +	int reg;
>> +	int ret = 0;
>> +
>> +	/* Device tree information */
>> +	ret = of_property_read_u32(node, "data-lanes", &dev->hw.num_lanes);
>> +	if (ret) {
>> +		dev_err(&pdev->dev, "Couldn't read data-lanes\n");
>> +		return ret;
>> +	}
>> +
>> +	ret = of_property_read_u32(node, "output-type", &dev->hw.output_type);
>> +	if (ret) {
>> +		dev_err(&pdev->dev, "Couldn't read output-type\n");
>> +		return ret;
>> +	}
>> +
>> +	ret = of_property_read_u32(node, "ipi-mode", &dev->hw.ipi_mode);
>> +	if (ret) {
>> +		dev_err(&pdev->dev, "Couldn't read ipi-mode\n");
>> +		return ret;
>> +	}
>> +
>> +	ret =
>> +	    of_property_read_u32(node, "ipi-auto-flush",
>> +				 &dev->hw.ipi_auto_flush);
>> +	if (ret) {
>> +		dev_err(&pdev->dev, "Couldn't read ipi-auto-flush\n");
>> +		return ret;
>> +	}
>> +
>> +	ret =
>> +	    of_property_read_u32(node, "ipi-color-mode",
>> +				 &dev->hw.ipi_color_mode);
>> +	if (ret) {
>> +		dev_err(&pdev->dev, "Couldn't read ipi-color-mode\n");
>> +		return ret;
>> +	}
>> +
>> +	ret =
>> +	    of_property_read_u32(node, "virtual-channel", &dev->hw.virtual_ch);
> 
> Is this some thing that should come from DT? Sure, we don't really have
> proper support for virtual channels right now, but could you use zero for
> now?
> 

I'm not sure if I'm understanding wha't you're saying.

This info is used by one of our CSI-2 Host outputs to determine which virtual
channel info should be processed.

>> +	if (ret) {
>> +		dev_err(&pdev->dev, "Couldn't read virtual-channel\n");
>> +		return ret;
>> +	}
>> +
>> +	node = of_get_child_by_name(node, "port");
>> +	if (!node)
>> +		return -EINVAL;
>> +
>> +	ret = of_property_read_u32(node, "reg", &reg);
>> +	if (ret) {
>> +		dev_err(&pdev->dev, "Couldn't read reg value\n");
>> +		return ret;
>> +	}
>> +	dev->index = reg - 1;
>> +
>> +	if (dev->index >= CSI_MAX_ENTITIES)
>> +		return -ENXIO;
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct of_device_id dw_mipi_csi_of_match[];
>> +
>> +/**
>> + * @short Initialization routine - Entry point of the driver
>> + * @param[in] pdev pointer to the platform device structure
>> + * @return 0 on success and a negative number on failure
>> + * Refer to Linux errors.
>> + */
>> +static int mipi_csi_probe(struct platform_device *pdev)
>> +{
>> +	const struct of_device_id *of_id;
>> +	struct device *dev = &pdev->dev;
>> +	struct resource *res = NULL;
>> +	struct mipi_csi_dev *mipi_csi;
>> +	int ret = -ENOMEM;
>> +
>> +	dev_info(&pdev->dev, "Installing MIPI CSI-2 module\n");
>> +
>> +	dev_dbg(&pdev->dev, "Device registration\n");
> 
> At least one of these is redundant. I'd just remove both.
> 

I'll remove them.

>> +	mipi_csi = devm_kzalloc(dev, sizeof(*mipi_csi), GFP_KERNEL);
>> +	if (!dev)
>> +		return -ENOMEM;
>> +
>> +	mutex_init(&mipi_csi->lock);
>> +	spin_lock_init(&mipi_csi->slock);
>> +	mipi_csi->pdev = pdev;
>> +
>> +	of_id = of_match_node(dw_mipi_csi_of_match, dev->of_node);
>> +	if (WARN_ON(of_id == NULL))
>> +		return -EINVAL;
>> +
>> +	ret = dw_mipi_csi_parse_dt(pdev, mipi_csi);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	dev_info(dev, "Request DPHY\n");
>> +	mipi_csi->phy = devm_phy_get(dev, "csi2-dphy");
>> +	if (IS_ERR(mipi_csi->phy))
>> +		return PTR_ERR(mipi_csi->phy);
> 
> It'd be better to tell what's wrong when there's an error instead of
> printing a series of messages even when all is well.
> 

You're right, I'll remove the prints regarding success and add some to inform of
errors.

>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +	mipi_csi->base_address = devm_ioremap_resource(dev, res);
>> +
>> +	if (IS_ERR(mipi_csi->base_address))
>> +		return PTR_ERR(mipi_csi->base_address);
>> +
>> +	mipi_csi->ctrl_irq_number = platform_get_irq(pdev, 0);
>> +	if (mipi_csi->ctrl_irq_number <= 0) {
>> +		dev_err(dev, "IRQ number not set.\n");
>> +		return mipi_csi->ctrl_irq_number;
>> +	}
>> +
>> +	ret = devm_request_irq(dev, mipi_csi->ctrl_irq_number,
>> +			       dw_mipi_csi_irq1, IRQF_SHARED,
>> +			       dev_name(dev), mipi_csi);
>> +	if (ret) {
>> +		dev_err(dev, "IRQ failed\n");
>> +		goto end;
>> +	}
>> +
>> +	v4l2_subdev_init(&mipi_csi->sd, &dw_mipi_csi_subdev_ops);
>> +	mipi_csi->sd.owner = THIS_MODULE;
>> +	snprintf(mipi_csi->sd.name, sizeof(mipi_csi->sd.name), "%s.%d",
>> +		 CSI_DEVICE_NAME, mipi_csi->index);
>> +	mipi_csi->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
>> +	mipi_csi->fmt = &dw_mipi_csi_formats[0];
>> +
>> +	mipi_csi->format.code = dw_mipi_csi_formats[0].code;
>> +	mipi_csi->format.width = MIN_WIDTH;
>> +	mipi_csi->format.height = MIN_HEIGHT;
>> +
>> +	mipi_csi->pads[CSI_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
>> +	mipi_csi->pads[CSI_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
>> +	ret = media_entity_pads_init(&mipi_csi->sd.entity,
>> +				     CSI_PADS_NUM, mipi_csi->pads);
>> +
>> +	if (ret < 0) {
>> +		dev_err(dev, "Media Entity init failed\n");
>> +		goto entity_cleanup;
>> +	}
>> +
>> +	/* This allows to retrieve the platform device id by the host driver */
>> +	v4l2_set_subdevdata(&mipi_csi->sd, pdev);
>> +
>> +	/* .. and a pointer to the subdev. */
>> +	platform_set_drvdata(pdev, &mipi_csi->sd);
>> +
>> +	dw_mipi_csi_mask_irq_power_off(mipi_csi);
>> +	dev_info(dev, "DW MIPI CSI-2 Host registered successfully\n");
>> +	return 0;
>> +
>> +entity_cleanup:
>> +	media_entity_cleanup(&mipi_csi->sd.entity);
>> +end:
>> +	return ret;
>> +}
>> +
>> +/**
>> + * @short Exit routine - Exit point of the driver
>> + * @param[in] pdev pointer to the platform device structure
>> + * @return 0 on success and a negative number on failure
>> + * Refer to Linux errors.
>> + */
>> +static int mipi_csi_remove(struct platform_device *pdev)
>> +{
>> +	struct v4l2_subdev *sd = platform_get_drvdata(pdev);
>> +	struct mipi_csi_dev *mipi_csi = sd_to_mipi_csi_dev(sd);
>> +
>> +	dev_dbg(&pdev->dev, "Removing MIPI CSI-2 module\n");
>> +	media_entity_cleanup(&mipi_csi->sd.entity);
>> +
>> +	return 0;
>> +}
>> +
>> +/**
>> + * @short of_device_id structure
>> + */
>> +static const struct of_device_id dw_mipi_csi_of_match[] = {
>> +	{
>> +	 .compatible = "snps,dw-mipi-csi"},
>> +	{ /* sentinel */ },
>> +};
>> +
>> +MODULE_DEVICE_TABLE(of, dw_mipi_csi_of_match);
>> +
>> +/**
>> + * @short Platform driver structure
>> + */
>> +static struct platform_driver __refdata dw_mipi_csi_pdrv = {
>> +	.remove = mipi_csi_remove,
>> +	.probe = mipi_csi_probe,
>> +	.driver = {
>> +		   .name = CSI_DEVICE_NAME,
>> +		   .owner = THIS_MODULE,
>> +		   .of_match_table = dw_mipi_csi_of_match,
>> +		   },
>> +};
>> +
>> +module_platform_driver(dw_mipi_csi_pdrv);
>> +
>> +MODULE_LICENSE("GPL");
>> +MODULE_AUTHOR("Ramiro Oliveira <roliveir@synopsys.com>");
>> +MODULE_DESCRIPTION("Synopsys DW MIPI CSI-2 Host driver");
>> diff --git a/drivers/media/platform/dwc/dw_mipi_csi.h b/drivers/media/platform/dwc/dw_mipi_csi.h
>> new file mode 100644
>> index 0000000..5e4c48c
>> --- /dev/null
>> +++ b/drivers/media/platform/dwc/dw_mipi_csi.h
>> @@ -0,0 +1,179 @@
>> +/*
>> + * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + */
>> +
>> +#ifndef DW_MIPI_CSI_H_
>> +#define DW_MIPI_CSI_H_
>> +
>> +#include <linux/module.h>
>> +#include <linux/errno.h>
>> +#include <linux/kernel.h>
>> +#include <linux/types.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/of_graph.h>
>> +#include <linux/delay.h>
>> +#include <linux/wait.h>
>> +#include <linux/string.h>
>> +#include <linux/phy/phy.h>
>> +#include <media/v4l2-device.h>
>> +#include <media/v4l2-dv-timings.h>
>> +#include <linux/videodev2.h>
>> +#include <linux/io.h>
> 
> Please arrange alphabetically. Same for other files.
> 
>> +
>> +#include "plat_ipk_video.h"
>> +
>> +#define CSI_DEVICE_NAME	"dw-mipi-csi"
>> +
>> +/** @short DWC MIPI CSI-2 register addresses*/
>> +enum register_addresses {
>> +	R_CSI2_VERSION = 0x00,
>> +	R_CSI2_N_LANES = 0x04,
>> +	R_CSI2_CTRL_RESETN = 0x08,
>> +	R_CSI2_INTERRUPT = 0x0C,
>> +	R_CSI2_DATA_IDS_1 = 0x10,
>> +	R_CSI2_DATA_IDS_2 = 0x14,
>> +	R_CSI2_IPI_MODE = 0x80,
>> +	R_CSI2_IPI_VCID = 0x84,
>> +	R_CSI2_IPI_DATA_TYPE = 0x88,
>> +	R_CSI2_IPI_MEM_FLUSH = 0x8C,
>> +	R_CSI2_IPI_HSA_TIME = 0x90,
>> +	R_CSI2_IPI_HBP_TIME = 0x94,
>> +	R_CSI2_IPI_HSD_TIME = 0x98,
>> +	R_CSI2_IPI_HLINE_TIME = 0x9C,
>> +	R_CSI2_IPI_VSA_LINES = 0xB0,
>> +	R_CSI2_IPI_VBP_LINES = 0xB4,
>> +	R_CSI2_IPI_VFP_LINES = 0xB8,
>> +	R_CSI2_IPI_VACTIVE_LINES = 0xBC,
>> +	R_CSI2_INT_PHY_FATAL = 0xe0,
>> +	R_CSI2_MASK_INT_PHY_FATAL = 0xe4,
>> +	R_CSI2_FORCE_INT_PHY_FATAL = 0xe8,
>> +	R_CSI2_INT_PKT_FATAL = 0xf0,
>> +	R_CSI2_MASK_INT_PKT_FATAL = 0xf4,
>> +	R_CSI2_FORCE_INT_PKT_FATAL = 0xf8,
>> +	R_CSI2_INT_FRAME_FATAL = 0x100,
>> +	R_CSI2_MASK_INT_FRAME_FATAL = 0x104,
>> +	R_CSI2_FORCE_INT_FRAME_FATAL = 0x108,
>> +	R_CSI2_INT_PHY = 0x110,
>> +	R_CSI2_MASK_INT_PHY = 0x114,
>> +	R_CSI2_FORCE_INT_PHY = 0x118,
>> +	R_CSI2_INT_PKT = 0x120,
>> +	R_CSI2_MASK_INT_PKT = 0x124,
>> +	R_CSI2_FORCE_INT_PKT = 0x128,
>> +	R_CSI2_INT_LINE = 0x130,
>> +	R_CSI2_MASK_INT_LINE = 0x134,
>> +	R_CSI2_FORCE_INT_LINE = 0x138,
>> +	R_CSI2_INT_IPI = 0x140,
>> +	R_CSI2_MASK_INT_IPI = 0x144,
>> +	R_CSI2_FORCE_INT_IPI = 0x148
>> +};
>> +
>> +/** @short IPI Data Types */
>> +enum data_type {
>> +	CSI_2_YUV420_8 = 0x18,
>> +	CSI_2_YUV420_10 = 0x19,
>> +	CSI_2_YUV420_8_LEG = 0x1A,
>> +	CSI_2_YUV420_8_SHIFT = 0x1C,
>> +	CSI_2_YUV420_10_SHIFT = 0x1D,
>> +	CSI_2_YUV422_8 = 0x1E,
>> +	CSI_2_YUV422_10 = 0x1F,
>> +	CSI_2_RGB444 = 0x20,
>> +	CSI_2_RGB555 = 0x21,
>> +	CSI_2_RGB565 = 0x22,
>> +	CSI_2_RGB666 = 0x23,
>> +	CSI_2_RGB888 = 0x24,
>> +	CSI_2_RAW6 = 0x28,
>> +	CSI_2_RAW7 = 0x29,
>> +	CSI_2_RAW8 = 0x2A,
>> +	CSI_2_RAW10 = 0x2B,
>> +	CSI_2_RAW12 = 0x2C,
>> +	CSI_2_RAW14 = 0x2D,
>> +};
>> +
>> +/** @short Interrupt Masks */
>> +enum interrupt_type {
>> +	CSI2_INT_PHY_FATAL = 1 << 0,
>> +	CSI2_INT_PKT_FATAL = 1 << 1,
>> +	CSI2_INT_FRAME_FATAL = 1 << 2,
>> +	CSI2_INT_PHY = 1 << 16,
>> +	CSI2_INT_PKT = 1 << 17,
>> +	CSI2_INT_LINE = 1 << 18,
>> +	CSI2_INT_IPI = 1 << 19,
>> +
>> +};
>> +
>> +/** @short DWC MIPI CSI-2 output types*/
>> +enum output_type {
>> +	IPI_OUT = 0,
>> +	IDI_OUT = 1,
>> +	BOTH_OUT = 2
>> +};
>> +
>> +/** @short IPI output types*/
>> +enum ipi_output_type {
>> +	CAMERA_TIMING = 0,
>> +	AUTO_TIMING = 1
>> +};
>> +
>> +/**
>> + * @short Format template
>> + */
>> +struct mipi_fmt {
>> +	const char *name;
>> +	u32 code;
>> +	u8 depth;
>> +};
>> +
>> +struct csi_hw {
>> +
>> +	uint32_t num_lanes;
>> +	uint32_t output_type;
>> +
>> +	/*IPI Info */
>> +	uint32_t ipi_mode;
>> +	uint32_t ipi_color_mode;
>> +	uint32_t ipi_auto_flush;
>> +	uint32_t virtual_ch;
>> +
>> +	uint32_t hsa;
>> +	uint32_t hbp;
>> +	uint32_t hsd;
>> +	uint32_t htotal;
>> +
>> +	uint32_t vsa;
>> +	uint32_t vbp;
>> +	uint32_t vfp;
>> +	uint32_t vactive;
>> +};
>> +
>> +/**
>> + * @short Structure to embed device driver information
>> + */
>> +struct mipi_csi_dev {
>> +	struct v4l2_subdev sd;
>> +	struct video_device vdev;
>> +
>> +	struct mutex lock;
>> +	spinlock_t slock;
>> +	struct media_pad pads[CSI_PADS_NUM];
>> +	struct platform_device *pdev;
>> +	u8 index;
>> +
>> +	/** Store current format */
>> +	const struct mipi_fmt *fmt;
>> +	struct v4l2_mbus_framefmt format;
>> +
>> +	/** Device Tree Information */
>> +	void __iomem *base_address;
>> +	uint32_t ctrl_irq_number;
>> +
>> +	struct csi_hw hw;
>> +
>> +	struct phy *phy;
>> +};
>> +
>> +#endif				/* DW_MIPI_CSI */
>> diff --git a/drivers/media/platform/dwc/plat_ipk.c b/drivers/media/platform/dwc/plat_ipk.c
>> new file mode 100644
>> index 0000000..48b9e36
>> --- /dev/null
>> +++ b/drivers/media/platform/dwc/plat_ipk.c
>> @@ -0,0 +1,835 @@
>> +/**
>> + * DWC MIPI CSI-2 Host IPK platform device driver
>> + *
>> + * Based on Omnivision OV7670 Camera Driver
>> + * Copyright (C) 2011 - 2013 Samsung Electronics Co., Ltd.
>> + * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
>> + *
>> + * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
>> + * Author: Ramiro Oliveira <ramiro.oliveira@synopsys.com>
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License as published
>> + * by the Free Software Foundation, either version 2 of the License,
>> + * or (at your option) any later version.
>> + */
>> +
>> +#include "plat_ipk.h"
>> +#include "video_device.h"
>> +#include "dw_mipi_csi.h"
>> +#include <media/v4l2-of.h>
>> +#include <media/v4l2-subdev.h>
>> +
>> +static int
>> +__plat_ipk_pipeline_s_format(struct plat_ipk_media_pipeline *ep,
>> +			     struct v4l2_subdev_format *fmt)
>> +{
>> +
>> +	struct plat_ipk_pipeline *p = to_plat_ipk_pipeline(ep);
>> +	static const u8 seq[IDX_MAX] = {IDX_SENSOR, IDX_CSI, IDX_VDEV};
>> +
>> +	fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
>> +	v4l2_subdev_call(p->subdevs[seq[IDX_CSI]], pad, set_fmt, NULL, fmt);
>> +
>> +	return 0;
>> +}
>> +
>> +static void
>> +plat_ipk_pipeline_prepare(struct plat_ipk_pipeline *p, struct media_entity *me)
>> +{
>> +	struct v4l2_subdev *sd;
>> +	int i = 0;
> 
> unsigned int?
> 
>> +
>> +	for (i = 0; i < IDX_MAX; i++)
>> +		p->subdevs[i] = NULL;
>> +
>> +	while (1) {
>> +		struct media_pad *pad = NULL;
>> +
>> +		for (i = 0; i < me->num_pads; i++) {
>> +			struct media_pad *spad = &me->pads[i];
>> +
>> +			if (!(spad->flags & MEDIA_PAD_FL_SINK))
>> +				continue;
>> +
>> +			pad = media_entity_remote_pad(spad);
>> +			if (pad)
>> +				break;
>> +		}
>> +		if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
>> +			break;
>> +
>> +		sd = media_entity_to_v4l2_subdev(pad->entity);
>> +
>> +		switch (sd->grp_id) {
>> +		case GRP_ID_SENSOR:
>> +			p->subdevs[IDX_SENSOR] = sd;
>> +			break;
>> +		case GRP_ID_CSI:
>> +			p->subdevs[IDX_CSI] = sd;
>> +			break;
>> +		case GRP_ID_VIDEODEV:
>> +			p->subdevs[IDX_VDEV] = sd;
>> +			break;
>> +		default:
>> +			break;
>> +		}
>> +		me = &sd->entity;
>> +		if (me->num_pads == 1)
>> +			break;
>> +	}
>> +}
>> +
>> +static int __subdev_set_power(struct v4l2_subdev *sd, int on)
>> +{
>> +	int *use_count;
>> +	int ret;
>> +
>> +	if (sd == NULL) {
>> +		pr_info("null subdev\n");
>> +		return -ENXIO;
>> +	}
>> +	use_count = &sd->entity.use_count;
>> +	if (on && (*use_count)++ > 0)
>> +		return 0;
>> +	else if (!on && (*use_count == 0 || --(*use_count) > 0))
>> +		return 0;
>> +
>> +	pr_debug("%d %s !\n", on, sd->entity.name);
> 
> Please do use dev_*() family of functions instead.
> 

This print is not really useful in production, so I'll remove it.

>> +	ret = v4l2_subdev_call(sd, core, s_power, on);
>> +
>> +	return ret != -ENOIOCTLCMD ? ret : 0;
>> +}
>> +
>> +static int plat_ipk_pipeline_s_power(struct plat_ipk_pipeline *p, bool on)
>> +{
>> +	static const u8 seq[IDX_MAX] = {IDX_CSI, IDX_SENSOR, IDX_VDEV};
>> +	int i, ret = 0;
>> +
>> +	for (i = 0; i < IDX_MAX; i++) {
>> +		unsigned int idx = seq[i];
>> +
>> +		if (p->subdevs[idx] == NULL)
>> +			pr_info("No device registered on %d\n", idx);
>> +		else {
>> +			ret = __subdev_set_power(p->subdevs[idx], on);
>> +			if (ret < 0 && ret != -ENXIO)
>> +				goto error;
>> +		}
>> +	}
>> +	return 0;
>> +error:
>> +	for (; i >= 0; i--) {
>> +		unsigned int idx = seq[i];
>> +
>> +		__subdev_set_power(p->subdevs[idx], !on);
>> +	}
>> +	return ret;
>> +}
>> +
>> +static int
>> +__plat_ipk_pipeline_open(struct plat_ipk_media_pipeline *ep,
>> +			 struct media_entity *me, bool prepare)
>> +{
>> +	struct plat_ipk_pipeline *p = to_plat_ipk_pipeline(ep);
>> +	int ret;
>> +
>> +	if (WARN_ON(p == NULL || me == NULL))
>> +		return -EINVAL;
>> +
>> +	if (prepare)
>> +		plat_ipk_pipeline_prepare(p, me);
>> +
>> +	ret = plat_ipk_pipeline_s_power(p, 1);
>> +	if (!ret)
>> +		return 0;
>> +
>> +	return ret;
>> +}
>> +
>> +static int __plat_ipk_pipeline_close(struct plat_ipk_media_pipeline *ep)
>> +{
>> +	struct plat_ipk_pipeline *p = to_plat_ipk_pipeline(ep);
>> +	int ret;
>> +
>> +	ret = plat_ipk_pipeline_s_power(p, 0);
>> +
>> +	return ret == -ENXIO ? 0 : ret;
>> +}
>> +
>> +static int
>> +__plat_ipk_pipeline_s_stream(struct plat_ipk_media_pipeline *ep, bool on)
>> +{
>> +	static const u8 seq[IDX_MAX] = {IDX_SENSOR, IDX_CSI, IDX_VDEV};
>> +	struct plat_ipk_pipeline *p = to_plat_ipk_pipeline(ep);
>> +	int i, ret = 0;
>> +
>> +	for (i = 0; i < IDX_MAX; i++) {
>> +		unsigned int idx = seq[i];
>> +
>> +		if (p->subdevs[idx] == NULL)
>> +			pr_debug("No device registered on %d\n", idx);
>> +		else {
>> +			ret =
>> +			    v4l2_subdev_call(p->subdevs[idx], video, s_stream,
>> +					     on);
>> +
>> +			if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
>> +				goto error;
>> +		}
>> +	}
>> +	return 0;
>> +error:
>> +	for (; i >= 0; i--) {
>> +		unsigned int idx = seq[i];
>> +
>> +		v4l2_subdev_call(p->subdevs[idx], video, s_stream, !on);
>> +	}
>> +	return ret;
>> +}
>> +
>> +static const struct plat_ipk_media_pipeline_ops plat_ipk_pipeline_ops = {
>> +	.open = __plat_ipk_pipeline_open,
>> +	.close = __plat_ipk_pipeline_close,
>> +	.set_format = __plat_ipk_pipeline_s_format,
>> +	.set_stream = __plat_ipk_pipeline_s_stream,
>> +};
>> +
>> +static struct plat_ipk_media_pipeline *
>> +plat_ipk_pipeline_create(struct plat_ipk_dev *plat_ipk)
>> +{
>> +	struct plat_ipk_pipeline *p;
>> +
>> +	p = kzalloc(sizeof(*p), GFP_KERNEL);
>> +	if (!p)
>> +		return NULL;
>> +
>> +	list_add_tail(&p->list, &plat_ipk->pipelines);
>> +
>> +	p->ep.ops = &plat_ipk_pipeline_ops;
>> +	return &p->ep;
>> +}
>> +
>> +static void
>> +plat_ipk_pipelines_free(struct plat_ipk_dev *plat_ipk)
>> +{
>> +	while (!list_empty(&plat_ipk->pipelines)) {
>> +		struct plat_ipk_pipeline *p;
>> +
>> +		p = list_entry(plat_ipk->pipelines.next, typeof(*p), list);
>> +		list_del(&p->list);
>> +		kfree(p);
>> +	}
>> +}
>> +
>> +static int
>> +plat_ipk_parse_port_node(struct plat_ipk_dev *plat_ipk,
>> +			 struct device_node *port, unsigned int index)
>> +{
>> +	struct device_node *rem, *ep;
>> +	struct v4l2_of_endpoint endpoint;
>> +	struct plat_ipk_source_info *pd = &plat_ipk->sensor[index].pdata;
>> +
>> +	/* Assume here a port node can have only one endpoint node. */
>> +	ep = of_get_next_child(port, NULL);
>> +	if (!ep)
>> +		return 0;
>> +
>> +	v4l2_of_parse_endpoint(ep, &endpoint);
>> +	if (WARN_ON(endpoint.base.port == 0) || index >= PLAT_MAX_SENSORS)
>> +		return -EINVAL;
>> +
>> +	pd->mux_id = endpoint.base.port - 1;
>> +
>> +	rem = of_graph_get_remote_port_parent(ep);
>> +	of_node_put(ep);
>> +	if (rem == NULL) {
>> +		v4l2_info(&plat_ipk->v4l2_dev,
>> +			  "Remote device at %s not found\n", ep->full_name);
>> +		return 0;
>> +	}
>> +
>> +	if (WARN_ON(index >= ARRAY_SIZE(plat_ipk->sensor)))
>> +		return -EINVAL;
>> +
>> +	plat_ipk->sensor[index].asd.match_type = V4L2_ASYNC_MATCH_OF;
>> +	plat_ipk->sensor[index].asd.match.of.node = rem;
>> +	plat_ipk->async_subdevs[index] = &plat_ipk->sensor[index].asd;
>> +
>> +	plat_ipk->num_sensors++;
>> +
>> +	of_node_put(rem);
>> +	return 0;
>> +}
>> +
>> +
>> +static int plat_ipk_register_sensor_entities(struct plat_ipk_dev *plat_ipk)
>> +{
>> +	struct device_node *parent = plat_ipk->pdev->dev.of_node;
>> +	struct device_node *node;
>> +	int index = 0;
>> +	int ret;
>> +
>> +	plat_ipk->num_sensors = 0;
>> +
>> +	for_each_available_child_of_node(parent, node) {
>> +		struct device_node *port;
>> +
>> +		if (of_node_cmp(node->name, "csi2"))
>> +			continue;
>> +		port = of_get_next_child(node, NULL);
>> +		if (!port)
>> +			continue;
>> +
>> +		ret = plat_ipk_parse_port_node(plat_ipk, port, index);
>> +		if (ret < 0)
>> +			return ret;
>> +		index++;
>> +	}
>> +	return 0;
>> +}
>> +
>> +static int
>> +__of_get_port_id(struct device_node *np)
>> +{
>> +	u32 reg = 0;
>> +
>> +	np = of_get_child_by_name(np, "port");
>> +	if (!np)
>> +		return -EINVAL;
>> +	of_property_read_u32(np, "reg", &reg);
>> +
>> +	return reg - 1;
>> +}
>> +
>> +static int register_videodev_entity(struct plat_ipk_dev *plat_ipk,
>> +			 struct video_device_dev *vid_dev)
>> +{
>> +	struct v4l2_subdev *sd;
>> +	struct plat_ipk_media_pipeline *ep;
>> +	int ret;
>> +
>> +	sd = &vid_dev->subdev;
>> +	sd->grp_id = GRP_ID_VIDEODEV;
>> +
>> +	ep = plat_ipk_pipeline_create(plat_ipk);
>> +	if (!ep)
>> +		return -ENOMEM;
>> +
>> +	v4l2_set_subdev_hostdata(sd, ep);
>> +
>> +	ret = v4l2_device_register_subdev(&plat_ipk->v4l2_dev, sd);
>> +	if (!ret)
>> +		plat_ipk->vid_dev = vid_dev;
>> +	else
>> +		v4l2_err(&plat_ipk->v4l2_dev,
>> +			 "Failed to register Video Device\n");
>> +	return ret;
>> +}
>> +
>> +static int register_mipi_csi_entity(struct plat_ipk_dev *plat_ipk,
>> +			 struct platform_device *pdev, struct v4l2_subdev *sd)
>> +{
>> +	struct device_node *node = pdev->dev.of_node;
>> +	int id, ret;
>> +
>> +	id = node ? __of_get_port_id(node) : max(0, pdev->id);
>> +
>> +	if (WARN_ON(id < 0 || id >= CSI_MAX_ENTITIES))
>> +		return -ENOENT;
>> +
>> +	if (WARN_ON(plat_ipk->mipi_csi[id].sd))
>> +		return -EBUSY;
>> +
>> +	sd->grp_id = GRP_ID_CSI;
>> +	ret = v4l2_device_register_subdev(&plat_ipk->v4l2_dev, sd);
>> +
>> +	if (!ret)
>> +		plat_ipk->mipi_csi[id].sd = sd;
>> +	else
>> +		v4l2_err(&plat_ipk->v4l2_dev,
>> +			 "Failed to register MIPI-CSI.%d (%d)\n", id, ret);
>> +	return ret;
>> +}
>> +
>> +static int plat_ipk_register_platform_entity(struct plat_ipk_dev *plat_ipk,
>> +				struct platform_device *pdev, int plat_entity)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	int ret = -EPROBE_DEFER;
>> +	void *drvdata;
>> +
>> +
> 
> Extra newline.
> 

Removing it.

>> +	device_lock(dev);
>> +	if (!dev->driver || !try_module_get(dev->driver->owner))
>> +		goto dev_unlock;
>> +
>> +	drvdata = dev_get_drvdata(dev);
>> +
>> +	if (drvdata) {
>> +		switch (plat_entity) {
>> +		case IDX_VDEV:
>> +			ret = register_videodev_entity(plat_ipk, drvdata);
>> +			break;
>> +		case IDX_CSI:
>> +			ret = register_mipi_csi_entity(plat_ipk, pdev, drvdata);
>> +			break;
>> +		default:
>> +			ret = -ENODEV;
>> +		}
>> +	} else
>> +		dev_err(&plat_ipk->pdev->dev, "%s no drvdata\n", dev_name(dev));
>> +	module_put(dev->driver->owner);
>> +dev_unlock:
>> +	device_unlock(dev);
>> +	if (ret == -EPROBE_DEFER)
>> +		dev_info(&plat_ipk->pdev->dev,
>> +			 "deferring %s device registration\n", dev_name(dev));
>> +	else if (ret < 0)
>> +		dev_err(&plat_ipk->pdev->dev,
>> +			"%s device registration failed (%d)\n", dev_name(dev),
>> +			ret);
>> +	return ret;
>> +}
>> +
>> +static int
>> +plat_ipk_register_platform_entities(struct plat_ipk_dev *plat_ipk,
>> +				    struct device_node *parent)
>> +{
>> +	struct device_node *node;
>> +	int ret = 0;
>> +
>> +	for_each_available_child_of_node(parent, node) {
>> +		struct platform_device *pdev;
>> +		int plat_entity = -1;
>> +
>> +		pdev = of_find_device_by_node(node);
>> +		if (!pdev)
>> +			continue;
>> +
>> +		if (!strcmp(node->name, VIDEODEV_OF_NODE_NAME))
>> +			plat_entity = IDX_VDEV;
>> +		else if (!strcmp(node->name, CSI_OF_NODE_NAME))
>> +			plat_entity = IDX_CSI;
>> +
>> +		if (plat_entity >= 0)
>> +			ret = plat_ipk_register_platform_entity(plat_ipk, pdev,
>> +								plat_entity);
>> +		put_device(&pdev->dev);
>> +		if (ret < 0)
>> +			break;
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +static void
>> +plat_ipk_unregister_entities(struct plat_ipk_dev *plat_ipk)
>> +{
>> +	int i;
>> +	struct video_device_dev *dev = plat_ipk->vid_dev;
>> +
>> +	if (dev == NULL)
>> +		return;
>> +	v4l2_device_unregister_subdev(&dev->subdev);
>> +	dev->ve.pipe = NULL;
>> +	plat_ipk->vid_dev = NULL;
>> +
>> +	for (i = 0; i < CSI_MAX_ENTITIES; i++) {
>> +		if (plat_ipk->mipi_csi[i].sd == NULL)
>> +			continue;
>> +		v4l2_device_unregister_subdev(plat_ipk->mipi_csi[i].sd);
>> +		plat_ipk->mipi_csi[i].sd = NULL;
>> +	}
>> +
>> +	v4l2_info(&plat_ipk->v4l2_dev, "Unregistered all entities\n");
>> +}
>> +
>> +static int
>> +__plat_ipk_create_videodev_sink_links(struct plat_ipk_dev *plat_ipk,
>> +				      struct media_entity *source,
>> +				      int pad)
>> +{
>> +	struct media_entity *sink;
>> +	int ret = 0;
>> +
>> +	if (!plat_ipk->vid_dev)
>> +		return 0;
>> +
>> +	sink = &plat_ipk->vid_dev->subdev.entity;
>> +	ret = media_create_pad_link(source, pad, sink,
>> +				    CSI_PAD_SOURCE, MEDIA_LNK_FL_ENABLED);
>> +	if (ret)
>> +		return ret;
>> +
>> +	ret = media_entity_call(sink, link_setup, &sink->pads[0],
>> +				&source->pads[pad], 0);
> 
> What's the purpose of calling link_setup() here?
> 

None, this was useful in the past but it's not being used right now. I'll remove it.

>> +	if (ret)
>> +		return 0;
>> +
>> +	v4l2_info(&plat_ipk->v4l2_dev, "created link [%s] -> [%s]\n",
>> +		  source->name, sink->name);
>> +
>> +	return 0;
>> +}
>> +
>> +
>> +static int
>> +__plat_ipk_create_videodev_source_links(struct plat_ipk_dev *plat_ipk)
>> +{
>> +	struct media_entity *source, *sink;
>> +	int ret = 0;
>> +
>> +	struct video_device_dev *vid_dev = plat_ipk->vid_dev;
>> +
>> +	if (vid_dev == NULL)
>> +		return -ENODEV;
>> +
>> +	source = &vid_dev->subdev.entity;
>> +	sink = &vid_dev->ve.vdev.entity;
>> +
>> +	ret = media_create_pad_link(source, VIDEO_DEV_SD_PAD_SOURCE_DMA,
>> +				    sink, 0, MEDIA_LNK_FL_ENABLED);
>> +
>> +	v4l2_info(&plat_ipk->v4l2_dev, "created link [%s] -> [%s]\n",
>> +		  source->name, sink->name);
>> +	return ret;
>> +}
>> +
>> +static int
>> +plat_ipk_create_links(struct plat_ipk_dev *plat_ipk)
>> +{
>> +	struct v4l2_subdev *csi_sensor[CSI_MAX_ENTITIES] = { NULL };
>> +	struct v4l2_subdev *sensor, *csi;
>> +	struct media_entity *source;
>> +	struct plat_ipk_source_info *pdata;
>> +	int i, pad, ret = 0;
>> +
>> +	for (i = 0; i < plat_ipk->num_sensors; i++) {
>> +		if (plat_ipk->sensor[i].subdev == NULL)
>> +			continue;
>> +
>> +		sensor = plat_ipk->sensor[i].subdev;
>> +		pdata = v4l2_get_subdev_hostdata(sensor);
>> +		if (!pdata)
>> +			continue;
>> +
>> +		source = NULL;
>> +
>> +		csi = plat_ipk->mipi_csi[pdata->mux_id].sd;
>> +		if (WARN(csi == NULL, "MIPI-CSI interface specified but	dw-mipi-csi module is not loaded!\n"))
>> +			return -EINVAL;
>> +
>> +		pad = sensor->entity.num_pads - 1;
>> +		ret = media_create_pad_link(&sensor->entity, pad,
>> +					    &csi->entity, CSI_PAD_SINK,
>> +					    MEDIA_LNK_FL_IMMUTABLE |
>> +					    MEDIA_LNK_FL_ENABLED);
>> +
>> +		if (ret)
>> +			return ret;
>> +		v4l2_info(&plat_ipk->v4l2_dev, "created link [%s] -> [%s]\n",
>> +			  sensor->entity.name, csi->entity.name);
> 
> dev_dbg() ?
> 

Yes. Changing it.

>> +
>> +		csi_sensor[pdata->mux_id] = sensor;
>> +	}
>> +
>> +	for (i = 0; i < CSI_MAX_ENTITIES; i++) {
>> +		if (plat_ipk->mipi_csi[i].sd == NULL) {
>> +			pr_info("no link\n");
>> +			continue;
>> +		}
>> +
>> +		source = &plat_ipk->mipi_csi[i].sd->entity;
>> +		pad = VIDEO_DEV_SD_PAD_SINK_CSI;
>> +
>> +		ret = __plat_ipk_create_videodev_sink_links(plat_ipk, source,
>> +								pad);
>> +	}
>> +
>> +	ret = __plat_ipk_create_videodev_source_links(plat_ipk);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	return ret;
>> +}
>> +
>> +static int __plat_ipk_modify_pipeline(struct media_entity *entity, bool enable)
>> +{
>> +	struct plat_ipk_video_entity *ve;
>> +	struct plat_ipk_pipeline *p;
>> +	struct video_device *vdev;
>> +	int ret;
>> +
>> +	vdev = media_entity_to_video_device(entity);
>> +
>> +	if (vdev->entity.use_count == 0)
>> +		return 0;
>> +
>> +	ve = vdev_to_plat_ipk_video_entity(vdev);
>> +	p = to_plat_ipk_pipeline(ve->pipe);
>> +
>> +	if (enable)
>> +		ret = __plat_ipk_pipeline_open(ve->pipe, entity, true);
>> +	else
>> +		ret = __plat_ipk_pipeline_close(ve->pipe);
>> +
>> +	if (ret == 0 && !enable)
>> +		memset(p->subdevs, 0, sizeof(p->subdevs));
>> +
>> +	return ret;
>> +}
>> +
>> +
>> +static int
>> +__plat_ipk_modify_pipelines(struct media_entity *entity, bool enable,
>> +			    struct media_entity_graph *graph)
>> +{
>> +	struct media_entity *entity_err = entity;
>> +	int ret;
>> +
>> +	media_entity_graph_walk_start(graph, entity);
>> +
>> +	while ((entity = media_entity_graph_walk_next(graph))) {
>> +		if (!is_media_entity_v4l2_video_device(entity))
>> +			continue;
>> +
>> +		ret = __plat_ipk_modify_pipeline(entity, enable);
>> +
>> +		if (ret < 0)
>> +			goto err;
>> +	}
>> +
>> +	return 0;
>> +
>> +err:
>> +	media_entity_graph_walk_start(graph, entity_err);
>> +
>> +	while ((entity_err = media_entity_graph_walk_next(graph))) {
>> +		if (!is_media_entity_v4l2_video_device(entity_err))
>> +			continue;
>> +
>> +		__plat_ipk_modify_pipeline(entity_err, !enable);
>> +
>> +		if (entity_err == entity)
>> +			break;
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +static int
>> +plat_ipk_link_notify(struct media_link *link, unsigned int flags,
>> +		     unsigned int notification)
>> +{
>> +	struct media_entity_graph *graph =
>> +	    &container_of(link->graph_obj.mdev, struct plat_ipk_dev,
>> +			  media_dev)->link_setup_graph;
>> +	struct media_entity *sink = link->sink->entity;
>> +	int ret = 0;
>> +
>> +	pr_debug("Link notify\n");
> 
> This probably made sense at development time but should be removed now.
> 

Yes. You're right.

>> +
>> +	if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH) {
>> +		ret = media_entity_graph_walk_init(graph, link->graph_obj.mdev);
>> +		if (ret)
>> +			return ret;
>> +		if (!(flags & MEDIA_LNK_FL_ENABLED))
>> +			ret = __plat_ipk_modify_pipelines(sink, false, graph);
>> +
>> +	} else if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH) {
>> +		if (link->flags & MEDIA_LNK_FL_ENABLED)
>> +			ret = __plat_ipk_modify_pipelines(sink, true, graph);
>> +		media_entity_graph_walk_cleanup(graph);
>> +	}
>> +
>> +	return ret ? -EPIPE : 0;
>> +}
> 
> Missing newline.
> 

Adding one.

>> +static const struct media_device_ops plat_ipk_media_ops = {
>> +	.link_notify = plat_ipk_link_notify,
>> +};
>> +
>> +
>> +static int
>> +subdev_notifier_bound(struct v4l2_async_notifier *notifier,
>> +		      struct v4l2_subdev *subdev, struct v4l2_async_subdev *asd)
>> +{
>> +	struct plat_ipk_dev *plat_ipk = notifier_to_plat_ipk(notifier);
>> +	struct plat_ipk_sensor_info *si = NULL;
>> +	int i;
>> +
>> +	for (i = 0; i < ARRAY_SIZE(plat_ipk->sensor); i++)
>> +		if (plat_ipk->sensor[i].asd.match.of.node ==
>> +		    subdev->dev->of_node)
>> +			si = &plat_ipk->sensor[i];
>> +
>> +	if (si == NULL)
>> +		return -EINVAL;
>> +
>> +	v4l2_set_subdev_hostdata(subdev, &si->pdata);
>> +
>> +	subdev->grp_id = GRP_ID_SENSOR;
>> +
>> +	si->subdev = subdev;
>> +
>> +	v4l2_info(&plat_ipk->v4l2_dev, "Registered sensor subdevice: %s (%d)\n",
>> +		  subdev->name, plat_ipk->num_sensors);
>> +
>> +	plat_ipk->num_sensors++;
>> +
>> +	return 0;
>> +}
>> +
>> +static int
>> +subdev_notifier_complete(struct v4l2_async_notifier *notifier)
>> +{
>> +	struct plat_ipk_dev *plat_ipk = notifier_to_plat_ipk(notifier);
>> +	int ret;
>> +
>> +	mutex_lock(&plat_ipk->media_dev.graph_mutex);
>> +
>> +	ret = plat_ipk_create_links(plat_ipk);
>> +	if (ret < 0)
>> +		goto unlock;
>> +
>> +	ret = v4l2_device_register_subdev_nodes(&plat_ipk->v4l2_dev);
>> +unlock:
>> +	mutex_unlock(&plat_ipk->media_dev.graph_mutex);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	return media_device_register(&plat_ipk->media_dev);
>> +}
>> +
>> +static const struct of_device_id plat_ipk_of_match[];
> 
> This is redundant.
> 

You're right.

>> +
>> +static int plat_ipk_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	struct v4l2_device *v4l2_dev;
>> +	struct plat_ipk_dev *plat_ipk;
>> +	int ret;
>> +
>> +	dev_info(dev, "Installing DW MIPI CSI-2 IPK Platform module\n");
>> +
>> +	plat_ipk = devm_kzalloc(dev, sizeof(*plat_ipk), GFP_KERNEL);
>> +	if (!plat_ipk)
>> +		return -ENOMEM;
>> +
>> +	spin_lock_init(&plat_ipk->slock);
>> +	INIT_LIST_HEAD(&plat_ipk->pipelines);
>> +	plat_ipk->pdev = pdev;
>> +
>> +	strlcpy(plat_ipk->media_dev.model, "SNPS IPK Platform",
>> +		sizeof(plat_ipk->media_dev.model));
>> +	plat_ipk->media_dev.ops = &plat_ipk_media_ops;
>> +	plat_ipk->media_dev.dev = dev;
>> +
>> +	v4l2_dev = &plat_ipk->v4l2_dev;
>> +	v4l2_dev->mdev = &plat_ipk->media_dev;
>> +	strlcpy(v4l2_dev->name, "plat-ipk", sizeof(v4l2_dev->name));
>> +
>> +	media_device_init(&plat_ipk->media_dev);
>> +
>> +	ret = v4l2_device_register(dev, &plat_ipk->v4l2_dev);
>> +	if (ret < 0) {
>> +		v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	platform_set_drvdata(pdev, plat_ipk);
>> +
>> +	ret = plat_ipk_register_platform_entities(plat_ipk, dev->of_node);
>> +	if (ret)
>> +		goto err_m_ent;
>> +
>> +	ret = plat_ipk_register_sensor_entities(plat_ipk);
>> +	if (ret)
>> +		goto err_m_ent;
>> +
>> +	if (plat_ipk->num_sensors > 0) {
>> +		plat_ipk->subdev_notifier.subdevs = plat_ipk->async_subdevs;
>> +		plat_ipk->subdev_notifier.num_subdevs = plat_ipk->num_sensors;
>> +		plat_ipk->subdev_notifier.bound = subdev_notifier_bound;
>> +		plat_ipk->subdev_notifier.complete = subdev_notifier_complete;
>> +		plat_ipk->num_sensors = 0;
>> +
>> +		ret = v4l2_async_notifier_register(&plat_ipk->v4l2_dev,
>> +						   &plat_ipk->subdev_notifier);
>> +		if (ret)
>> +			goto err_m_ent;
>> +	}
>> +
>> +	return 0;
>> +
>> +err_m_ent:
>> +	plat_ipk_unregister_entities(plat_ipk);
>> +	media_device_unregister(&plat_ipk->media_dev);
>> +	media_device_cleanup(&plat_ipk->media_dev);
>> +	v4l2_device_unregister(&plat_ipk->v4l2_dev);
>> +	return ret;
>> +}
>> +
>> +static int plat_ipk_remove(struct platform_device *pdev)
>> +{
>> +	struct plat_ipk_dev *dev = platform_get_drvdata(pdev);
>> +
>> +	if (!dev)
>> +		return 0;
> 
> Wouldn't !dev here require a driver bug? If probe() succeeds, then dev is
> non-zero, right?
> 

It was just a better safe than sorry situation, but if you think it's not
necessary I'll remove it.

>> +
>> +	v4l2_async_notifier_unregister(&dev->subdev_notifier);
>> +
>> +	v4l2_device_unregister(&dev->v4l2_dev);
>> +	plat_ipk_unregister_entities(dev);
>> +	plat_ipk_pipelines_free(dev);
>> +	media_device_unregister(&dev->media_dev);
>> +	media_device_cleanup(&dev->media_dev);
>> +
>> +	dev_info(&pdev->dev, "Driver removed\n");
>> +
>> +	return 0;
>> +}
>> +
>> +/**
>> + * @short of_device_id structure
>> + */
>> +static const struct of_device_id plat_ipk_of_match[] = {
>> +	{.compatible = "snps,plat-ipk"},
>> +	{}
>> +};
>> +
>> +MODULE_DEVICE_TABLE(of, plat_ipk_of_match);
>> +
>> +/**
>> + * @short Platform driver structure
>> + */
>> +static struct platform_driver plat_ipk_pdrv = {
>> +	.remove = plat_ipk_remove,
>> +	.probe = plat_ipk_probe,
>> +	.driver = {
>> +		   .name = "snps,plat-ipk",
>> +		   .owner = THIS_MODULE,
>> +		   .of_match_table = plat_ipk_of_match,
>> +		   },
>> +};
>> +
>> +static int __init
>> +plat_ipk_init(void)
>> +{
>> +	request_module("dw-mipi-csi");
> 
> Why do you need this?
> 

To make sure that module is loaded when I start loading this one.

Do you think it's not necessary to do this, or is there a better way to do this?

>> +
>> +	return platform_driver_register(&plat_ipk_pdrv);
>> +}
>> +
>> +static void __exit
>> +plat_ipk_exit(void)
>> +{
>> +	platform_driver_unregister(&plat_ipk_pdrv);
>> +}
>> +
>> +module_init(plat_ipk_init);
>> +module_exit(plat_ipk_exit);
>> +
>> +MODULE_LICENSE("GPL");
>> +MODULE_AUTHOR("Ramiro Oliveira <roliveir@synopsys.com>");
>> +MODULE_DESCRIPTION("Platform driver for MIPI CSI-2 Host IPK");
>> diff --git a/drivers/media/platform/dwc/plat_ipk.h b/drivers/media/platform/dwc/plat_ipk.h
>> new file mode 100644
>> index 0000000..ef569eb
>> --- /dev/null
>> +++ b/drivers/media/platform/dwc/plat_ipk.h
>> @@ -0,0 +1,97 @@
>> +/*
>> + * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + */
>> +
>> +#ifndef PLAT_IPK_H_
>> +#define PLAT_IPK_H_
>> +
>> +#include <linux/module.h>
>> +#include <linux/errno.h>
>> +#include <linux/kernel.h>
>> +#include <linux/types.h>
>> +#include <linux/slab.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/of_platform.h>
>> +#include <linux/list.h>
>> +#include <linux/string.h>
>> +#include <media/v4l2-device.h>
>> +#include <linux/videodev2.h>
>> +#include <media/media-entity.h>
>> +
>> +#include "plat_ipk_video.h"
>> +
>> +#define VIDEODEV_OF_NODE_NAME	"video-device"
>> +#define CSI_OF_NODE_NAME	"csi2"
>> +
>> +enum plat_ipk_subdev_index {
>> +	IDX_SENSOR,
>> +	IDX_CSI,
>> +	IDX_VDEV,
>> +	IDX_MAX,
>> +};
>> +
>> +struct plat_ipk_sensor_info {
>> +	struct plat_ipk_source_info pdata;
>> +	struct v4l2_async_subdev asd;
>> +	struct v4l2_subdev *subdev;
>> +	struct mipi_csi_dev *host;
>> +};
>> +
>> +struct plat_ipk_pipeline {
>> +	struct plat_ipk_media_pipeline ep;
>> +	struct list_head list;
>> +	struct media_entity *vdev_entity;
>> +	struct v4l2_subdev *subdevs[IDX_MAX];
>> +};
>> +
>> +#define to_plat_ipk_pipeline(_ep)\
>> +	 container_of(_ep, struct plat_ipk_pipeline, ep)
>> +
>> +struct mipi_csi_info {
>> +	struct v4l2_subdev *sd;
>> +	int id;
>> +};
>> +
>> +/**
>> + * @short Structure to embed device driver information
>> + */
>> +struct plat_ipk_dev {
>> +	struct mipi_csi_info		mipi_csi[CSI_MAX_ENTITIES];
>> +	struct video_device_dev		*vid_dev;
>> +	struct device			*dev;
>> +	struct media_device		media_dev;
>> +	struct v4l2_device		v4l2_dev;
>> +	struct platform_device		*pdev;
>> +	struct plat_ipk_sensor_info	sensor[PLAT_MAX_SENSORS];
>> +	struct v4l2_async_notifier	subdev_notifier;
>> +	struct v4l2_async_subdev	*async_subdevs[PLAT_MAX_SENSORS];
>> +	spinlock_t			slock;
>> +	struct list_head		pipelines;
>> +	int				num_sensors;
>> +	struct media_entity_graph	link_setup_graph;
>> +};
>> +
>> +static inline struct plat_ipk_dev *
>> +entity_to_plat_ipk_mdev(struct media_entity *me)
>> +{
>> +	return me->graph_obj.mdev == NULL ? NULL :
>> +	    container_of(me->graph_obj.mdev, struct plat_ipk_dev, media_dev);
>> +}
>> +
>> +static inline struct plat_ipk_dev *
>> +notifier_to_plat_ipk(struct v4l2_async_notifier *n)
>> +{
>> +	return container_of(n, struct plat_ipk_dev, subdev_notifier);
>> +}
>> +
>> +static inline void
>> +plat_ipk_graph_unlock(struct plat_ipk_video_entity *ve)
>> +{
>> +	mutex_unlock(&ve->vdev.entity.graph_obj.mdev->graph_mutex);
>> +}
>> +
>> +#endif				/* PLAT_IPK_H_ */
>> diff --git a/drivers/media/platform/dwc/plat_ipk_video.h b/drivers/media/platform/dwc/plat_ipk_video.h
>> new file mode 100644
>> index 0000000..6bfc9f8
>> --- /dev/null
>> +++ b/drivers/media/platform/dwc/plat_ipk_video.h
>> @@ -0,0 +1,97 @@
>> +/*
>> + * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + */
>> +
>> +#ifndef PLAT_IPK_INCLUDES_H_
>> +#define PLAT_IPK_INCLUDES_H_
>> +
>> +#include <media/media-entity.h>
>> +#include <media/v4l2-dev.h>
>> +#include <media/v4l2-mediabus.h>
>> +#include <media/v4l2-subdev.h>
>> +
>> +/*
>> + * The subdevices' group IDs.
>> + */
>> +
>> +#define MAX_WIDTH	3280
>> +#define MAX_HEIGHT	1852
>> +
>> +#define MIN_WIDTH	640
>> +#define MIN_HEIGHT	480
>> +
>> +#define GRP_ID_SENSOR		(10)
>> +#define GRP_ID_CSI		(20)
>> +#define GRP_ID_VIDEODEV		(30)
>> +
>> +#define CSI_MAX_ENTITIES	1
>> +#define PLAT_MAX_SENSORS	1
>> +
>> +enum video_dev_pads {
>> +	VIDEO_DEV_SD_PAD_SINK_CSI = 0,
>> +	VIDEO_DEV_SD_PAD_SOURCE_DMA = 1,
>> +	VIDEO_DEV_SD_PADS_NUM = 2,
>> +};
>> +
>> +enum mipi_csi_pads {
>> +	CSI_PAD_SINK = 0,
>> +	CSI_PAD_SOURCE = 1,
>> +	CSI_PADS_NUM = 2,
>> +};
>> +
>> +struct plat_ipk_source_info {
>> +	u16 flags;
>> +	u16 mux_id;
>> +};
>> +
>> +struct plat_ipk_fmt {
>> +	u32 mbus_code;
>> +	char *name;
>> +	u32 fourcc;
>> +	u8 depth;
>> +};
>> +
>> +struct plat_ipk_media_pipeline;
>> +
>> +/*
>> + * Media pipeline operations to be called from within a video node,  i.e. the
>> + * last entity within the pipeline. Implemented by related media device driver.
>> + */
>> +struct plat_ipk_media_pipeline_ops {
>> +	int (*prepare)(struct plat_ipk_media_pipeline *p,
>> +			struct media_entity *me);
>> +	int (*unprepare)(struct plat_ipk_media_pipeline *p);
>> +	int (*open)(struct plat_ipk_media_pipeline *p,
>> +			struct media_entity *me, bool resume);
>> +	int (*close)(struct plat_ipk_media_pipeline *p);
>> +	int (*set_stream)(struct plat_ipk_media_pipeline *p, bool state);
>> +	int (*set_format)(struct plat_ipk_media_pipeline *p,
>> +			struct v4l2_subdev_format *fmt);
>> +};
>> +
>> +struct plat_ipk_video_entity {
>> +	struct video_device vdev;
>> +	struct plat_ipk_media_pipeline *pipe;
>> +};
>> +
>> +struct plat_ipk_media_pipeline {
>> +	struct media_pipeline mp;
>> +	const struct plat_ipk_media_pipeline_ops *ops;
>> +};
>> +
>> +static inline struct plat_ipk_video_entity *
>> +vdev_to_plat_ipk_video_entity(struct video_device *vdev)
>> +{
>> +	return container_of(vdev, struct plat_ipk_video_entity, vdev);
>> +}
>> +
>> +#define plat_ipk_pipeline_call(ent, op, args...)\
>> +	(!(ent) ? -ENOENT : (((ent)->pipe->ops && (ent)->pipe->ops->op) ? \
>> +	(ent)->pipe->ops->op(((ent)->pipe), ##args) : -ENOIOCTLCMD))	  \
>> +
>> +
>> +#endif				/* PLAT_IPK_INCLUDES_H_ */
>> diff --git a/drivers/media/platform/dwc/video_device.c b/drivers/media/platform/dwc/video_device.c
>> new file mode 100644
>> index 0000000..d827426
>> --- /dev/null
>> +++ b/drivers/media/platform/dwc/video_device.c
>> @@ -0,0 +1,741 @@
>> +/*
>> + * DWC MIPI CSI-2 Host IPK video device device driver
>> + *
>> + * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
>> + * Author: Ramiro Oliveira <ramiro.oliveira@synopsys.com>
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License as published
>> + * by the Free Software Foundation, either version 2 of the License,
>> + * or (at your option) any later version.
>> + */
>> +
>> +#include "video_device.h"
>> +
>> +const struct plat_ipk_fmt vid_dev_formats[] = {
>> +	{
>> +		.name = "RGB888",
>> +		.fourcc = V4L2_PIX_FMT_BGR24,
>> +		.depth = 24,
>> +		.mbus_code = MEDIA_BUS_FMT_RGB888_2X12_LE,
>> +	}, {
>> +		.name = "RGB565",
>> +		.fourcc = V4L2_PIX_FMT_RGB565,
>> +		.depth = 16,
>> +		.mbus_code = MEDIA_BUS_FMT_RGB565_2X8_BE,
>> +	},
>> +};
>> +
>> +const struct plat_ipk_fmt *
>> +vid_dev_find_format(struct v4l2_format *f, int index)
>> +{
>> +	const struct plat_ipk_fmt *fmt = NULL;
>> +	unsigned int i;
>> +
>> +	if (index >= (int) ARRAY_SIZE(vid_dev_formats))
>> +		return NULL;
>> +
>> +	for (i = 0; i < ARRAY_SIZE(vid_dev_formats); ++i) {
>> +		fmt = &vid_dev_formats[i];
>> +		if (fmt->fourcc == f->fmt.pix.pixelformat)
>> +			return fmt;
>> +	}
>> +	return NULL;
>> +}
>> +
>> +/*
>> + * Video node ioctl operations
>> + */
>> +static int
>> +vidioc_querycap(struct file *file, void *priv, struct v4l2_capability *cap)
>> +{
>> +	struct video_device_dev *vid_dev = video_drvdata(file);
>> +
>> +	strlcpy(cap->driver, VIDEO_DEVICE_NAME, sizeof(cap->driver));
>> +	strlcpy(cap->card, VIDEO_DEVICE_NAME, sizeof(cap->card));
>> +	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
>> +		 dev_name(&vid_dev->pdev->dev));
>> +
>> +	cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
>> +	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
>> +	return 0;
>> +}
>> +
>> +int
>> +vidioc_enum_fmt_vid_cap(struct file *file, void *priv, struct v4l2_fmtdesc *f)
>> +{
>> +	const struct plat_ipk_fmt *p_fmt;
>> +
>> +	if (f->index >= ARRAY_SIZE(vid_dev_formats))
>> +		return -EINVAL;
>> +
>> +	p_fmt = &vid_dev_formats[f->index];
>> +
>> +	strlcpy(f->description, p_fmt->name, sizeof(f->description));
>> +	f->pixelformat = p_fmt->fourcc;
>> +
>> +	return 0;
>> +}
>> +
>> +int vidioc_g_fmt_vid_cap(struct file *file, void *priv, struct v4l2_format *f)
>> +{
>> +	struct video_device_dev *dev = video_drvdata(file);
>> +
>> +	memcpy(&f->fmt.pix, &dev->format.fmt.pix,
>> +	       sizeof(struct v4l2_pix_format));
>> +
>> +	return 0;
>> +}
>> +
>> +static int
>> +vidioc_try_fmt_vid_cap(struct file *file, void *priv, struct v4l2_format *f)
>> +{
>> +	const struct plat_ipk_fmt *fmt;
>> +
>> +	fmt = vid_dev_find_format(f, -1);
>> +	if (!fmt) {
>> +		f->fmt.pix.pixelformat = V4L2_PIX_FMT_RGB565;
>> +		fmt = vid_dev_find_format(f, -1);
>> +	}
>> +
>> +	f->fmt.pix.field = V4L2_FIELD_NONE;
>> +	v4l_bound_align_image(&f->fmt.pix.width, 48, MAX_WIDTH, 2,
>> +			      &f->fmt.pix.height, 32, MAX_HEIGHT, 0, 0);
>> +
>> +	f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3;
>> +	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
>> +	f->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
>> +	return 0;
>> +}
>> +
>> +int vidioc_s_fmt_vid_cap(struct file *file, void *priv, struct v4l2_format *f)
>> +{
>> +	struct video_device_dev *dev = video_drvdata(file);
>> +	int ret;
>> +	struct v4l2_subdev_format fmt;
>> +
>> +	if (vb2_is_busy(&dev->vb_queue))
>> +		return -EBUSY;
>> +
>> +	ret = vidioc_try_fmt_vid_cap(file, dev, f);
>> +	if (ret)
>> +		return ret;
>> +
>> +	dev->fmt = vid_dev_find_format(f, -1);
>> +	pixel_format(dev) = f->fmt.pix.pixelformat;
>> +	width(dev) = f->fmt.pix.width;
>> +	height(dev) = f->fmt.pix.height;
>> +	bytes_per_line(dev) = width(dev) * dev->fmt->depth / 8;
>> +	size_image(dev) = height(dev) * bytes_per_line(dev);
>> +
>> +	fmt.format.colorspace = V4L2_COLORSPACE_SRGB;
>> +	fmt.format.code = dev->fmt->mbus_code;
>> +
>> +	fmt.format.width = width(dev);
>> +	fmt.format.height = height(dev);
>> +
>> +	ret = plat_ipk_pipeline_call(&dev->ve, set_format, &fmt);
>> +
>> +	return 0;
>> +}
>> +
>> +int vidioc_enum_framesizes(struct file *file, void *fh,
>> +		       struct v4l2_frmsizeenum *fsize)
>> +{
>> +	static const struct v4l2_frmsize_stepwise sizes = {
>> +		48, MAX_WIDTH, 4,
>> +		32, MAX_HEIGHT, 1
>> +	};
>> +	int i;
>> +
>> +	if (fsize->index)
>> +		return -EINVAL;
>> +	for (i = 0; i < ARRAY_SIZE(vid_dev_formats); i++)
>> +		if (vid_dev_formats[i].fourcc == fsize->pixel_format)
>> +			break;
>> +	if (i == ARRAY_SIZE(vid_dev_formats))
>> +		return -EINVAL;
>> +	fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
>> +	fsize->stepwise = sizes;
>> +	return 0;
>> +}
>> +
>> +int vidioc_enum_input(struct file *file, void *priv, struct v4l2_input *input)
>> +{
>> +	if (input->index != 0)
>> +		return -EINVAL;
>> +
>> +	input->type = V4L2_INPUT_TYPE_CAMERA;
>> +	input->std = V4L2_STD_ALL;	/* Not sure what should go here */
>> +	strcpy(input->name, "Camera");
>> +	return 0;
>> +}
>> +
>> +int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
>> +{
>> +	*i = 0;
>> +	return 0;
>> +}
>> +
>> +int vidioc_s_input(struct file *file, void *priv, unsigned int i)
>> +{
>> +	if (i != 0)
>> +		return -EINVAL;
>> +	return 0;
>> +}
>> +
>> +int vidioc_g_std(struct file *file, void *fh, v4l2_std_id *norm)
>> +{
>> +	*norm = V4L2_STD_NTSC_M;
>> +	return 0;
>> +}
>> +
>> +int vidioc_s_std(struct file *file, void *fh, v4l2_std_id a)
>> +{
>> +	return 0;
>> +}
>> +
>> +static int
>> +vid_dev_pipeline_validate(struct video_device_dev *vid_dev)
>> +{
>> +	return 0;
>> +}
>> +
>> +static int
>> +vid_dev_streamon(struct file *file, void *priv, enum v4l2_buf_type type)
>> +{
>> +	struct video_device_dev *vid_dev = video_drvdata(file);
>> +	struct media_entity *entity = &vid_dev->ve.vdev.entity;
>> +	int ret;
>> +
>> +	ret = media_entity_pipeline_start(entity, &vid_dev->ve.pipe->mp);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	ret = vid_dev_pipeline_validate(vid_dev);
>> +	if (ret < 0)
>> +		goto err_p_stop;
>> +
>> +	vb2_ioctl_streamon(file, priv, type);
>> +	if (!ret)
>> +		return ret;
>> +
>> +err_p_stop:
>> +	media_entity_pipeline_stop(entity);
>> +	return 0;
>> +}
>> +
>> +static int
>> +vid_dev_streamoff(struct file *file, void *priv, enum v4l2_buf_type type)
>> +{
>> +	struct video_device_dev *vid_dev = video_drvdata(file);
>> +	int ret;
>> +
>> +	ret = vb2_ioctl_streamoff(file, priv, type);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	media_entity_pipeline_stop(&vid_dev->ve.vdev.entity);
>> +	return 0;
>> +}
>> +
>> +static const struct v4l2_ioctl_ops vid_dev_ioctl_ops = {
>> +	.vidioc_querycap = vidioc_querycap,
>> +	.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
>> +	.vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
>> +	.vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
>> +	.vidioc_enum_framesizes = vidioc_enum_framesizes,
>> +	.vidioc_enum_input = vidioc_enum_input,
>> +	.vidioc_g_input = vidioc_g_input,
>> +	.vidioc_s_input = vidioc_s_input,
>> +
>> +	.vidioc_reqbufs = vb2_ioctl_reqbufs,
>> +	.vidioc_create_bufs = vb2_ioctl_create_bufs,
>> +	.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
>> +	.vidioc_querybuf = vb2_ioctl_querybuf,
>> +	.vidioc_qbuf = vb2_ioctl_qbuf,
>> +	.vidioc_dqbuf = vb2_ioctl_dqbuf,
>> +	.vidioc_streamon = vid_dev_streamon,
>> +	.vidioc_streamoff = vid_dev_streamoff,
>> +};
>> +
>> +/* Capture subdev media entity operations */
>> +static int
>> +vid_dev_link_setup(struct media_entity *entity,
>> +		   const struct media_pad *local,
>> +		   const struct media_pad *remote, u32 flags)
>> +{
>> +	return 0;
>> +}
>> +
>> +static const struct media_entity_operations vid_dev_subdev_media_ops = {
>> +	.link_setup = vid_dev_link_setup,
>> +};
>> +
>> +static int
>> +vid_dev_open(struct file *file)
>> +{
>> +	struct video_device_dev *vid_dev = video_drvdata(file);
>> +	struct media_entity *me = &vid_dev->ve.vdev.entity;
>> +	int ret;
>> +
>> +	mutex_lock(&vid_dev->lock);
>> +
>> +	ret = v4l2_fh_open(file);
>> +	if (ret < 0)
>> +		goto unlock;
>> +
>> +	if (!v4l2_fh_is_singular_file(file))
>> +		goto unlock;
>> +
>> +	mutex_lock(&me->graph_obj.mdev->graph_mutex);
>> +
>> +	ret = plat_ipk_pipeline_call(&vid_dev->ve, open, me, true);
>> +	if (ret == 0)
>> +		me->use_count++;
>> +
>> +	mutex_unlock(&me->graph_obj.mdev->graph_mutex);
>> +
>> +	if (!ret)
>> +		goto unlock;
>> +
>> +	v4l2_fh_release(file);
>> +unlock:
>> +	mutex_unlock(&vid_dev->lock);
>> +	return ret;
>> +}
>> +
>> +static int
>> +vid_dev_release(struct file *file)
>> +{
>> +	struct video_device_dev *vid_dev = video_drvdata(file);
>> +	struct media_entity *entity = &vid_dev->ve.vdev.entity;
>> +
>> +	mutex_lock(&vid_dev->lock);
>> +
>> +	if (v4l2_fh_is_singular_file(file)) {
>> +		plat_ipk_pipeline_call(&vid_dev->ve, close);
>> +		mutex_lock(&entity->graph_obj.mdev->graph_mutex);
>> +		entity->use_count--;
>> +		mutex_unlock(&entity->graph_obj.mdev->graph_mutex);
>> +	}
>> +
>> +	_vb2_fop_release(file, NULL);
>> +
>> +	mutex_unlock(&vid_dev->lock);
>> +	return 0;
>> +}
>> +
>> +static const struct v4l2_file_operations vid_dev_fops = {
>> +	.owner = THIS_MODULE,
>> +	.open = vid_dev_open,
>> +	.release = vid_dev_release,
>> +	.write = vb2_fop_write,
>> +	.read = vb2_fop_read,
>> +	.poll = vb2_fop_poll,
>> +	.unlocked_ioctl = video_ioctl2,
>> +	.mmap = vb2_fop_mmap,
>> +};
>> +
>> +/*
>> + * VideoBuffer2 operations
>> + */
>> +
>> +void fill_buffer(struct video_device_dev *dev, struct rx_buffer *buf,
>> +			int buf_num, unsigned long flags)
>> +{
>> +	int size = 0;
>> +	void *vbuf = NULL;
>> +
>> +	if (&buf->vb == NULL)
>> +		return;
>> +
>> +	size = vb2_plane_size(&buf->vb.vb2_buf, 0);
>> +	vbuf = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
>> +
>> +	if (vbuf) {
>> +		spin_unlock_irqrestore(&dev->slock, flags);
>> +
>> +		memcpy(vbuf, dev->dma_buf[buf_num].cpu_addr, size);
>> +
>> +		spin_lock_irqsave(&dev->slock, flags);
>> +
>> +		buf->vb.field = dev->format.fmt.pix.field;
>> +		buf->vb.sequence++;
>> +		buf->vb.vb2_buf.timestamp = ktime_get_ns();
>> +	}
>> +	vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
>> +}
>> +
>> +static void buffer_copy_process(void *param)
>> +{
>> +	struct video_device_dev *dev = (struct video_device_dev *) param;
>> +	unsigned long flags;
>> +	struct dmaqueue *dma_q = &dev->vidq;
>> +	struct rx_buffer *buf = NULL;
>> +
>> +	spin_lock_irqsave(&dev->slock, flags);
>> +
>> +	if (!list_empty(&dma_q->active)) {
>> +		buf = list_entry(dma_q->active.next, struct rx_buffer, list);
>> +		list_del(&buf->list);
>> +		fill_buffer(dev, buf, dev->last_idx, flags);
>> +	}
>> +
>> +	spin_unlock_irqrestore(&dev->slock, flags);
>> +}
>> +
>> +static inline struct rx_buffer *to_rx_buffer(struct vb2_v4l2_buffer *vb2)
>> +{
>> +	return container_of(vb2, struct rx_buffer, vb);
>> +}
>> +
>> +int queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
>> +			unsigned int *nplanes, unsigned int sizes[],
>> +			struct device *alloc_devs[])
>> +{
>> +	struct video_device_dev *dev = vb2_get_drv_priv(vq);
>> +	unsigned long size = 0;
>> +	int i;
>> +
>> +	size = size_image(dev);
>> +	if (size == 0)
>> +		return -EINVAL;
>> +
>> +	*nbuffers = N_BUFFERS;
>> +
>> +	for (i = 0; i < N_BUFFERS; i++) {
>> +		dev->dma_buf[i].cpu_addr = dma_alloc_coherent(&dev->pdev->dev,
>> +							      size_image(dev),
>> +							      &dev->
>> +							      dma_buf
>> +							      [i].dma_addr,
>> +							      GFP_KERNEL);
>> +	}
>> +
>> +	*nplanes = 1;
>> +	sizes[0] = size;
>> +
>> +	return 0;
>> +}
>> +
>> +int buffer_prepare(struct vb2_buffer *vb)
>> +{
>> +	struct rx_buffer *buf = NULL;
>> +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
>> +	int size = 0;
>> +
>> +	if (vb == NULL) {
>> +		pr_warn("%s:vb2_buffer is null\n", FUNC_NAME);
>> +		return 0;
>> +	}
>> +
>> +	buf = to_rx_buffer(vbuf);
>> +
>> +	size = vb2_plane_size(&buf->vb.vb2_buf, 0);
>> +	vb2_set_plane_payload(&buf->vb.vb2_buf, 0, size);
>> +
>> +	INIT_LIST_HEAD(&buf->list);
>> +	return 0;
>> +}
>> +
>> +void buffer_queue(struct vb2_buffer *vb)
>> +{
>> +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
>> +	struct video_device_dev *dev = NULL;
>> +	struct rx_buffer *buf = NULL;
>> +	struct dmaqueue *vidq = NULL;
>> +	struct dma_async_tx_descriptor *desc;
>> +	u32 flags;
>> +
>> +	if (vb == NULL) {
>> +		pr_warn("%s:vb2_buffer is null\n", FUNC_NAME);
>> +		return;
>> +	}
>> +
>> +	dev = vb2_get_drv_priv(vb->vb2_queue);
>> +	buf = to_rx_buffer(vbuf);
>> +	vidq = &dev->vidq;
>> +
>> +	flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
>> +	dev->xt.dir = DMA_DEV_TO_MEM;
>> +	dev->xt.src_sgl = false;
>> +	dev->xt.dst_inc = false;
>> +	dev->xt.dst_sgl = true;
>> +	dev->xt.dst_start = dev->dma_buf[dev->idx].dma_addr;
>> +
>> +	dev->last_idx = dev->idx;
>> +	dev->idx++;
>> +	if (dev->idx >= N_BUFFERS)
>> +		dev->idx = 0;
>> +
>> +	dev->xt.frame_size = 1;
>> +	dev->sgl[0].size = bytes_per_line(dev);
>> +	dev->sgl[0].icg = 0;
>> +	dev->xt.numf = height(dev);
>> +
>> +	desc = dmaengine_prep_interleaved_dma(dev->dma, &dev->xt, flags);
>> +	if (!desc) {
>> +		pr_err("Failed to prepare DMA transfer\n");
>> +		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
>> +		return;
>> +	}
>> +
>> +	desc->callback = buffer_copy_process;
>> +	desc->callback_param = dev;
>> +
>> +	spin_lock(&dev->slock);
>> +	list_add_tail(&buf->list, &vidq->active);
>> +	spin_unlock(&dev->slock);
>> +
>> +	dmaengine_submit(desc);
>> +
>> +	if (vb2_is_streaming(&dev->vb_queue))
>> +		dma_async_issue_pending(dev->dma);
>> +}
>> +
>> +int start_streaming(struct vb2_queue *vq, unsigned int count)
>> +{
>> +	struct video_device_dev *dev = vb2_get_drv_priv(vq);
>> +
>> +	dma_async_issue_pending(dev->dma);
>> +
>> +	return 0;
>> +}
>> +
>> +void stop_streaming(struct vb2_queue *vq)
>> +{
>> +	struct video_device_dev *dev = vb2_get_drv_priv(vq);
>> +	struct dmaqueue *dma_q = &dev->vidq;
>> +
>> +	/* Stop and reset the DMA engine. */
>> +	dmaengine_terminate_all(dev->dma);
>> +
>> +	while (!list_empty(&dma_q->active)) {
>> +		struct rx_buffer *buf;
>> +
>> +		buf = list_entry(dma_q->active.next, struct rx_buffer, list);
>> +		if (buf) {
>> +			list_del(&buf->list);
>> +			vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
>> +		}
>> +	}
>> +	list_del_init(&dev->vidq.active);
>> +}
>> +
>> +static const struct vb2_ops vb2_video_qops = {
>> +	.queue_setup = queue_setup,
>> +	.buf_prepare = buffer_prepare,
>> +	.buf_queue = buffer_queue,
>> +	.start_streaming = start_streaming,
>> +	.stop_streaming = stop_streaming,
>> +	.wait_prepare = vb2_ops_wait_prepare,
>> +	.wait_finish = vb2_ops_wait_finish,
>> +};
>> +
>> +static int vid_dev_subdev_s_power(struct v4l2_subdev *sd, int on)
>> +{
>> +	return 0;
> 
> I think you could just omit defining the function if it does nothing. The
> same goes for core ops.
> 

This is just here as a placeholder, since this is called in another driver. If
you really think I should remove it I'll have to adapt the other driver to be
prepared for non-existant functions.

>> +}
>> +
>> +static int vid_dev_subdev_registered(struct v4l2_subdev *sd)
>> +{
>> +	struct video_device_dev *vid_dev = v4l2_get_subdevdata(sd);
>> +	struct vb2_queue *q = &vid_dev->vb_queue;
>> +	struct video_device *vfd = &vid_dev->ve.vdev;
>> +	int ret;
>> +
>> +	memset(vfd, 0, sizeof(*vfd));
>> +
>> +	snprintf(vfd->name, sizeof(vfd->name), VIDEO_DEVICE_NAME);
> 
> How about strlcpy()?
> 
>> +
>> +	vfd->fops = &vid_dev_fops;
>> +	vfd->ioctl_ops = &vid_dev_ioctl_ops;
>> +	vfd->v4l2_dev = sd->v4l2_dev;
>> +	vfd->minor = -1;
>> +	vfd->release = video_device_release_empty;
>> +	vfd->queue = q;
>> +
>> +	INIT_LIST_HEAD(&vid_dev->vidq.active);
>> +	init_waitqueue_head(&vid_dev->vidq.wq);
>> +	memset(q, 0, sizeof(*q));
>> +	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
>> +	q->io_modes = VB2_MMAP | VB2_USERPTR;
>> +	q->ops = &vb2_video_qops;
>> +	q->mem_ops = &vb2_vmalloc_memops;
>> +	q->buf_struct_size = sizeof(struct rx_buffer);
>> +	q->drv_priv = vid_dev;
>> +	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
>> +	q->lock = &vid_dev->lock;
>> +
>> +	ret = vb2_queue_init(q);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	vid_dev->vd_pad.flags = MEDIA_PAD_FL_SINK;
>> +	ret = media_entity_pads_init(&vfd->entity, 1, &vid_dev->vd_pad);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	video_set_drvdata(vfd, vid_dev);
>> +	vid_dev->ve.pipe = v4l2_get_subdev_hostdata(sd);
>> +
>> +	ret = video_register_device(vfd, VFL_TYPE_GRABBER, -1);
>> +	if (ret < 0) {
>> +		media_entity_cleanup(&vfd->entity);
>> +		vid_dev->ve.pipe = NULL;
>> +		return ret;
>> +	}
>> +
>> +	v4l2_info(sd->v4l2_dev, "Registered %s as /dev/%s\n",
>> +		  vfd->name, video_device_node_name(vfd));
>> +	return 0;
>> +}
>> +
>> +static void vid_dev_subdev_unregistered(struct v4l2_subdev *sd)
>> +{
>> +	struct video_device_dev *vid_dev = v4l2_get_subdevdata(sd);
>> +
>> +	if (vid_dev == NULL)
>> +		return;
> 
> Can this happen?
> 

It's the same as before, a better safe than sorry situation. But if you think it
can't happen I'll remove it.

>> +
>> +	mutex_lock(&vid_dev->lock);
>> +
>> +	if (video_is_registered(&vid_dev->ve.vdev)) {
>> +		video_unregister_device(&vid_dev->ve.vdev);
>> +		media_entity_cleanup(&vid_dev->ve.vdev.entity);
>> +		vid_dev->ve.pipe = NULL;
>> +	}
>> +
>> +	mutex_unlock(&vid_dev->lock);
>> +}
>> +
>> +static const struct v4l2_subdev_internal_ops vid_dev_subdev_internal_ops = {
>> +	.registered = vid_dev_subdev_registered,
>> +	.unregistered = vid_dev_subdev_unregistered,
>> +};
>> +
>> +static const struct v4l2_subdev_core_ops vid_dev_subdev_core_ops = {
>> +	.s_power = vid_dev_subdev_s_power,
>> +};
>> +
>> +static struct v4l2_subdev_ops vid_dev_subdev_ops = {
>> +	.core = &vid_dev_subdev_core_ops,
>> +};
>> +
>> +static int vid_dev_create_capture_subdev(struct video_device_dev *vid_dev)
>> +{
>> +	struct v4l2_subdev *sd = &vid_dev->subdev;
>> +	int ret;
>> +
>> +	v4l2_subdev_init(sd, &vid_dev_subdev_ops);
>> +	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
>> +	snprintf(sd->name, sizeof(sd->name), "Capture device");
>> +
>> +	vid_dev->subdev_pads[VIDEO_DEV_SD_PAD_SINK_CSI].flags =
>> +		MEDIA_PAD_FL_SOURCE;
>> +	vid_dev->subdev_pads[VIDEO_DEV_SD_PAD_SOURCE_DMA].flags =
>> +		MEDIA_PAD_FL_SINK;
>> +	ret =
> 
> No need for a line break.
> 

Right.

>> +	    media_entity_pads_init(&sd->entity, VIDEO_DEV_SD_PADS_NUM,
>> +				   vid_dev->subdev_pads);
>> +	if (ret)
>> +		return ret;
>> +
>> +	sd->internal_ops = &vid_dev_subdev_internal_ops;
>> +	sd->entity.ops = &vid_dev_subdev_media_ops;
>> +	sd->owner = THIS_MODULE;
>> +	v4l2_set_subdevdata(sd, vid_dev);
>> +
>> +	return 0;
>> +}
>> +
>> +static void vid_dev_unregister_subdev(struct video_device_dev *vid_dev)
>> +{
>> +	struct v4l2_subdev *sd = &vid_dev->subdev;
>> +
>> +	v4l2_device_unregister_subdev(sd);
>> +	media_entity_cleanup(&sd->entity);
>> +	v4l2_set_subdevdata(sd, NULL);
>> +}
>> +
>> +static const struct of_device_id vid_dev_of_match[];
>> +
>> +static int vid_dev_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	const struct of_device_id *of_id;
>> +	int ret = 0;
>> +	struct video_device_dev *vid_dev;
>> +
>> +	dev_info(dev, "Installing IPK Video Device module\n");
>> +
>> +	if (!dev->of_node)
>> +		return -ENODEV;
>> +
>> +	vid_dev = devm_kzalloc(dev, sizeof(*vid_dev), GFP_KERNEL);
>> +	if (!vid_dev)
>> +		return -ENOMEM;
>> +
>> +	of_id = of_match_node(vid_dev_of_match, dev->of_node);
>> +	if (WARN_ON(of_id == NULL))
>> +		return -EINVAL;
>> +
>> +	vid_dev->pdev = pdev;
>> +
>> +	spin_lock_init(&vid_dev->slock);
>> +	mutex_init(&vid_dev->lock);
>> +
>> +	dev_info(&pdev->dev, "Requesting DMA\n");
>> +	vid_dev->dma = dma_request_slave_channel(&pdev->dev, "vdma0");
>> +	if (vid_dev->dma == NULL) {
>> +		dev_err(&pdev->dev, "no VDMA channel found\n");
>> +		ret = -ENODEV;
>> +		goto end;
>> +	}
>> +
>> +	ret = vid_dev_create_capture_subdev(vid_dev);
>> +	if (ret)
>> +		goto end;
>> +
>> +	platform_set_drvdata(pdev, vid_dev);
>> +
>> +	dev_info(dev, "Video Device registered successfully\n");
>> +	return 0;
>> +end:
>> +	dev_err(dev, "Video Device not registered!!\n");
>> +	return ret;
>> +}
>> +
>> +static int vid_dev_remove(struct platform_device *pdev)
>> +{
>> +	struct video_device_dev *dev = platform_get_drvdata(pdev);
>> +
>> +	vid_dev_unregister_subdev(dev);
>> +	dev_info(&pdev->dev, "Driver removed\n");
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct of_device_id vid_dev_of_match[] = {
>> +	{.compatible = "snps,video-device"},
>> +	{}
>> +};
>> +
>> +MODULE_DEVICE_TABLE(of, vid_dev_of_match);
>> +
>> +static struct platform_driver __refdata vid_dev_pdrv = {
>> +	.remove = vid_dev_remove,
>> +	.probe = vid_dev_probe,
>> +	.driver = {
>> +		   .name = VIDEO_DEVICE_NAME,
>> +		   .owner = THIS_MODULE,
>> +		   .of_match_table = vid_dev_of_match,
>> +		   },
>> +};
>> +
>> +module_platform_driver(vid_dev_pdrv);
>> +
>> +MODULE_LICENSE("GPL");
>> +MODULE_AUTHOR("Ramiro Oliveira <roliveir@synopsys.com>");
>> +MODULE_DESCRIPTION("Driver for configuring DMA and Video Device");
>> diff --git a/drivers/media/platform/dwc/video_device.h b/drivers/media/platform/dwc/video_device.h
>> new file mode 100644
>> index 0000000..e828d4b
>> --- /dev/null
>> +++ b/drivers/media/platform/dwc/video_device.h
>> @@ -0,0 +1,101 @@
>> +/*
>> + * Copyright (C) 2016 Synopsys, Inc. All rights reserved.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + */
>> +
>> +#ifndef VIDEO_DEVICE_H_
>> +#define VIDEO_DEVICE_H_
>> +
>> +#include <linux/module.h>
>> +#include <linux/errno.h>
>> +#include <linux/kernel.h>
>> +#include <linux/types.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/delay.h>
>> +#include <linux/list.h>
>> +#include <linux/wait.h>
>> +#include <linux/string.h>
>> +#include <linux/videodev2.h>
>> +#include <linux/dma/xilinx_dma.h>
>> +#include <media/v4l2-device.h>
>> +#include <media/v4l2-ioctl.h>
>> +#include <media/v4l2-fh.h>
>> +#include <media/v4l2-common.h>
>> +#include <media/videobuf2-vmalloc.h>
>> +#include <media/media-entity.h>
>> +#include <linux/io.h>
>> +
>> +#include "plat_ipk_video.h"
>> +
>> +#define N_BUFFERS 3
>> +
>> +#define VIDEO_DEVICE_NAME	"video-device"
>> +
>> +#define FUNC_NAME __func__
>> +
>> +struct rx_buffer {
>> +	/** @short Buffer for video frames */
>> +	struct vb2_v4l2_buffer vb;
>> +	struct list_head list;
>> +
>> +	dma_addr_t dma_addr;
>> +	void *cpu_addr;
>> +};
>> +
>> +struct dmaqueue {
>> +	struct list_head active;
>> +	wait_queue_head_t wq;
>> +};
>> +
>> +/**
>> + * @short Structure to embed device driver information
>> + */
>> +struct video_device_dev {
>> +	struct platform_device *pdev;
>> +	struct v4l2_device *v4l2_dev;
>> +	struct v4l2_subdev subdev;
>> +	struct media_pad vd_pad;
>> +	struct media_pad subdev_pads[VIDEO_DEV_SD_PADS_NUM];
>> +	struct mutex lock;
>> +	spinlock_t slock;
>> +	struct plat_ipk_video_entity ve;
>> +	struct v4l2_format format;
>> +	struct v4l2_pix_format pix_format;
>> +	const struct plat_ipk_fmt *fmt;
>> +	unsigned long *alloc_ctx;
>> +
>> +	/* Buffer and DMA */
>> +	struct vb2_queue vb_queue;
>> +	int idx;
>> +	int last_idx;
>> +	struct dmaqueue vidq;
>> +	struct rx_buffer dma_buf[N_BUFFERS];
>> +	struct dma_chan *dma;
>> +	struct dma_interleaved_template xt;
>> +	struct data_chunk sgl[1];
>> +};
>> +
>> +/**
>> + * @short Defines to simplify the code reading
>> + */
>> +
>> +#define pixel_format(dev)	\
>> +	dev->format.fmt.pix.pixelformat
>> +#define bytes_per_line(dev)	\
>> +	dev->format.fmt.pix.bytesperline
>> +#define width(dev)		\
>> +	dev->format.fmt.pix.width
>> +#define height(dev)		\
>> +	dev->format.fmt.pix.height
>> +#define size_image(dev)		\
>> +	dev->format.fmt.pix.sizeimage
> 
> How about referring to the field directly, or define a local variable for a
> pointer to dev->format.fmt.fix in functions it's needed.
> 

Sure, I can do that.

Just to be clear what is the reason why these macros shouldn't be used?

>> +
>> +const struct plat_ipk_fmt *vid_dev_find_format(struct v4l2_format *f,
>> +					       int index);
>> +
>> +#endif				/* VIDEO_DEVICE_H_ */
> 

Thanks once again for you feedback.

BRs,
Ramiro Oliveira