[PATCH v2 0/2] Add CX9020 device tree

[PATCH v2 0/2] Add CX9020 device tree

[linux-kernel-dev]

From: Patrick Bruenn <p.bruenn@beckhoff.com>

Add device tree for Beckhoff CX9020 Embedded PC.

The CX9020 differs from i.MX53 Quick Start Board by:
- use uart2 instead of uart1
- DVI-D connector instead of VGA
- no audio
- CCAT FPGA connected to emi
- enable rtc

Patrick Bruenn (2):
  ARM: dts: imx: add CX9020 Embedded PC device tree
  drm/panel: simple: Add support for ddc-only panel

 arch/arm/boot/dts/Makefile           |   1 +
 arch/arm/boot/dts/imx53-cx9020.dts   | 370 +++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/panel/panel-simple.c |   6 +
 3 files changed, 377 insertions(+)
 create mode 100644 arch/arm/boot/dts/imx53-cx9020.dts

-- 
2.11.0

[PATCH v2 2/2] drm/panel: simple: Add support for ddc-only panel

[linux-kernel-dev]

From: Patrick Bruenn <p.bruenn@beckhoff.com>

This is a fix for the CX9020 Embedded PC. On that device the 24-bit
parallel-display signal of the imx53 is combined with an I2C channel
and converted to DVI-D port. Devicetree magic always requires a panel
connected to the parallel-display port.
We add an empty panel_desc, to get recognized by the panel-simple
driver, which can then use the ddc bus to read the panels configuration.

Signed-off-by: Patrick Bruenn <p.bruenn@beckhoff.com>
---
 drivers/gpu/drm/panel/panel-simple.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index c4566ce8fda7..52b2a7fb59ed 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -1856,6 +1856,9 @@ static const struct panel_desc winstar_wf35ltiacd = {
 	.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
 };
 
+static const struct panel_desc simple_ddc_only = {
+};
+
 static const struct of_device_id platform_of_match[] = {
 	{
 		.compatible = "ampire,am-480272h3tmqw-t01h",
@@ -2050,6 +2053,9 @@ static const struct of_device_id platform_of_match[] = {
 		.compatible = "winstar,wf35ltiacd",
 		.data = &winstar_wf35ltiacd,
 	}, {
+		.compatible = "simple,ddc-only",
+		.data = &simple_ddc_only,
+	}, {
 		/* sentinel */
 	}
 };
-- 
2.11.0

[PATCH v3 0/2] Add CX9020 device tree

[linux-kernel-dev-QonKdJ6Bx35Wk0Htik3J/w]

From: Patrick Bruenn <p.bruenn-QonKdJ6Bx35Wk0Htik3J/w@public.gmane.org>

Add device tree for Beckhoff CX9020 Embedded PC.

The CX9020 differs from i.MX53 Quick Start Board by:
- use uart2 instead of uart1
- DVI-D connector instead of VGA
- no audio
- CCAT FPGA connected to emi
- enable rtc

v3: add missing changelog, sorry about the noise
v2:
- include simple ddc-only panel patch
- keep alphabetic order of dts/Makefile
- configure uart2 with 'fsl,dte-mode'
- use display-0 and panel-0 as node names
- remove unnecessary "simple-bus" for fixed regulators


Patrick Bruenn (2):
  ARM: dts: imx: add CX9020 Embedded PC device tree
  drm/panel: simple: Add support for ddc-only panel

 arch/arm/boot/dts/Makefile           |   1 +
 arch/arm/boot/dts/imx53-cx9020.dts   | 370 +++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/panel/panel-simple.c |   6 +
 3 files changed, 377 insertions(+)
 create mode 100644 arch/arm/boot/dts/imx53-cx9020.dts

-- 
2.11.0


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[PATCH v3 2/2] drm/panel: simple: Add support for ddc-only panel

[linux-kernel-dev]

From: Patrick Bruenn <p.bruenn@beckhoff.com>

This is a fix for the CX9020 Embedded PC. On that device the 24-bit
parallel-display signal of the imx53 is combined with an I2C channel
and converted to DVI-D port. Devicetree magic always requires a panel
connected to the parallel-display port.
We add an empty panel_desc, to get recognized by the panel-simple
driver, which can then use the ddc bus to read the panels configuration.

Signed-off-by: Patrick Bruenn <p.bruenn@beckhoff.com>
---
 drivers/gpu/drm/panel/panel-simple.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index c4566ce8fda7..52b2a7fb59ed 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -1856,6 +1856,9 @@ static const struct panel_desc winstar_wf35ltiacd = {
 	.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
 };
 
+static const struct panel_desc simple_ddc_only = {
+};
+
 static const struct of_device_id platform_of_match[] = {
 	{
 		.compatible = "ampire,am-480272h3tmqw-t01h",
@@ -2050,6 +2053,9 @@ static const struct of_device_id platform_of_match[] = {
 		.compatible = "winstar,wf35ltiacd",
 		.data = &winstar_wf35ltiacd,
 	}, {
+		.compatible = "simple,ddc-only",
+		.data = &simple_ddc_only,
+	}, {
 		/* sentinel */
 	}
 };
-- 
2.11.0

Re: [PATCH v2 2/2] drm/panel: simple: Add support for ddc-only panel

[Rob Herring]

On Thu, Jul 13, 2017 at 6:04 AM,  <linux-kernel-dev@beckhoff.com> wrote:
> From: Patrick Bruenn <p.bruenn@beckhoff.com>
>
> This is a fix for the CX9020 Embedded PC. On that device the 24-bit
> parallel-display signal of the imx53 is combined with an I2C channel
> and converted to DVI-D port. Devicetree magic always requires a panel
> connected to the parallel-display port.

Then fix this. It's not the DT that requires this, but limitations in
the i.MX driver.

> We add an empty panel_desc, to get recognized by the panel-simple
> driver, which can then use the ddc bus to read the panels configuration.
>
> Signed-off-by: Patrick Bruenn <p.bruenn@beckhoff.com>
> ---
>  drivers/gpu/drm/panel/panel-simple.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> index c4566ce8fda7..52b2a7fb59ed 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -1856,6 +1856,9 @@ static const struct panel_desc winstar_wf35ltiacd = {
>         .bus_format = MEDIA_BUS_FMT_RGB888_1X24,
>  };
>
> +static const struct panel_desc simple_ddc_only = {
> +};
> +
>  static const struct of_device_id platform_of_match[] = {
>         {
>                 .compatible = "ampire,am-480272h3tmqw-t01h",
> @@ -2050,6 +2053,9 @@ static const struct of_device_id platform_of_match[] = {
>                 .compatible = "winstar,wf35ltiacd",
>                 .data = &winstar_wf35ltiacd,
>         }, {
> +               .compatible = "simple,ddc-only",

If you notice the rest of the file, we require compatibles be specific
for the panels.

What you want here is a "dvi-connector" node.

Rob
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