[PATCH v2] [media] davinci: vpif: adaptions for DT support

[PATCH v2] [media] davinci: vpif: adaptions for DT support

[Kevin Hilman]

The davinci VPIF is a single hardware block, but the existing driver
is broken up into a common library (vpif.c), output (vpif_display.c) and
intput (vpif_capture.c).

When migrating to DT, to better model the hardware, and because
registers, interrupts, etc. are all common,it was decided to
have a single VPIF hardware node[1].

Because davinci uses legacy, non-DT boot on several SoCs still, the
platform_drivers need to remain.  But they are also needed in DT boot.
Since there are no DT nodes for the display/capture parts in DT
boot (there is a single node for the parent/common device) we need to
create platform_devices somewhere to instansiate the platform_drivers.

When VPIF display/capture are needed for a DT boot, the VPIF node
will have endpoints defined for its subdevs.  Therefore, vpif_probe()
checks for the presence of endpoints, and if detected manually creates
the platform_devices for the display and capture platform_drivers.

[1] Documentation/devicetree/bindings/media/ti,da850-vpif.txt

Signed-off-by: Kevin Hilman <khilman@baylibre.com>
---
Changes since v1:
- added proper error checking to kzalloc calls
- rebased onto media/master

 drivers/media/platform/davinci/vpif.c | 57 ++++++++++++++++++++++++++++++++++-
 1 file changed, 56 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/davinci/vpif.c b/drivers/media/platform/davinci/vpif.c
index 1b02a6363f77..c2d214dfaa3e 100644
--- a/drivers/media/platform/davinci/vpif.c
+++ b/drivers/media/platform/davinci/vpif.c
@@ -26,6 +26,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/spinlock.h>
 #include <linux/v4l2-dv-timings.h>
+#include <linux/of_graph.h>
 
 #include "vpif.h"
 
@@ -423,7 +424,9 @@ EXPORT_SYMBOL(vpif_channel_getfid);
 
 static int vpif_probe(struct platform_device *pdev)
 {
-	static struct resource	*res;
+	static struct resource	*res, *res_irq;
+	struct platform_device *pdev_capture, *pdev_display;
+	struct device_node *endpoint = NULL;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	vpif_base = devm_ioremap_resource(&pdev->dev, res);
@@ -435,6 +438,58 @@ static int vpif_probe(struct platform_device *pdev)
 
 	spin_lock_init(&vpif_lock);
 	dev_info(&pdev->dev, "vpif probe success\n");
+
+	/*
+	 * If VPIF Node has endpoints, assume "new" DT support,
+	 * where capture and display drivers don't have DT nodes
+	 * so their devices need to be registered manually here
+	 * for their legacy platform_drivers to work.
+	 */
+	endpoint = of_graph_get_next_endpoint(pdev->dev.of_node,
+					      endpoint);
+	if (!endpoint) 
+		return 0;
+
+	/*
+	 * For DT platforms, manually create platform_devices for
+	 * capture/display drivers.
+	 */
+	res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (!res_irq) {
+		dev_warn(&pdev->dev, "Missing IRQ resource.\n");
+		return -EINVAL;
+	}
+
+	pdev_capture = devm_kzalloc(&pdev->dev, sizeof(*pdev_capture),
+				    GFP_KERNEL);
+	if (pdev_capture) {
+		pdev_capture->name = "vpif_capture";
+		pdev_capture->id = -1;
+		pdev_capture->resource = res_irq;
+		pdev_capture->num_resources = 1;
+		pdev_capture->dev.dma_mask = pdev->dev.dma_mask;
+		pdev_capture->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
+		pdev_capture->dev.parent = &pdev->dev;
+		platform_device_register(pdev_capture);
+	} else {
+		dev_warn(&pdev->dev, "Unable to allocate memory for pdev_capture.\n");
+	}
+
+	pdev_display = devm_kzalloc(&pdev->dev, sizeof(*pdev_display),
+				    GFP_KERNEL);
+	if (pdev_display) {
+		pdev_display->name = "vpif_display";
+		pdev_display->id = -1;
+		pdev_display->resource = res_irq;
+		pdev_display->num_resources = 1;
+		pdev_display->dev.dma_mask = pdev->dev.dma_mask;
+		pdev_display->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
+		pdev_display->dev.parent = &pdev->dev;
+		platform_device_register(pdev_display);
+	} else {
+		dev_warn(&pdev->dev, "Unable to allocate memory for pdev_display.\n");
+	}
+
 	return 0;
 }
 
-- 
2.9.3

[PATCH v2] [media] davinci: vpif: adaptions for DT support

[Kevin Hilman]

The davinci VPIF is a single hardware block, but the existing driver
is broken up into a common library (vpif.c), output (vpif_display.c) and
intput (vpif_capture.c).

When migrating to DT, to better model the hardware, and because
registers, interrupts, etc. are all common,it was decided to
have a single VPIF hardware node[1].

Because davinci uses legacy, non-DT boot on several SoCs still, the
platform_drivers need to remain.  But they are also needed in DT boot.
Since there are no DT nodes for the display/capture parts in DT
boot (there is a single node for the parent/common device) we need to
create platform_devices somewhere to instansiate the platform_drivers.

When VPIF display/capture are needed for a DT boot, the VPIF node
will have endpoints defined for its subdevs.  Therefore, vpif_probe()
checks for the presence of endpoints, and if detected manually creates
the platform_devices for the display and capture platform_drivers.

[1] Documentation/devicetree/bindings/media/ti,da850-vpif.txt

Signed-off-by: Kevin Hilman <khilman@baylibre.com>
---
Changes since v1:
- added proper error checking to kzalloc calls
- rebased onto media/master

 drivers/media/platform/davinci/vpif.c | 57 ++++++++++++++++++++++++++++++++++-
 1 file changed, 56 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/davinci/vpif.c b/drivers/media/platform/davinci/vpif.c
index 1b02a6363f77..c2d214dfaa3e 100644
--- a/drivers/media/platform/davinci/vpif.c
+++ b/drivers/media/platform/davinci/vpif.c
@@ -26,6 +26,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/spinlock.h>
 #include <linux/v4l2-dv-timings.h>
+#include <linux/of_graph.h>
 
 #include "vpif.h"
 
@@ -423,7 +424,9 @@ EXPORT_SYMBOL(vpif_channel_getfid);
 
 static int vpif_probe(struct platform_device *pdev)
 {
-	static struct resource	*res;
+	static struct resource	*res, *res_irq;
+	struct platform_device *pdev_capture, *pdev_display;
+	struct device_node *endpoint = NULL;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	vpif_base = devm_ioremap_resource(&pdev->dev, res);
@@ -435,6 +438,58 @@ static int vpif_probe(struct platform_device *pdev)
 
 	spin_lock_init(&vpif_lock);
 	dev_info(&pdev->dev, "vpif probe success\n");
+
+	/*
+	 * If VPIF Node has endpoints, assume "new" DT support,
+	 * where capture and display drivers don't have DT nodes
+	 * so their devices need to be registered manually here
+	 * for their legacy platform_drivers to work.
+	 */
+	endpoint = of_graph_get_next_endpoint(pdev->dev.of_node,
+					      endpoint);
+	if (!endpoint) 
+		return 0;
+
+	/*
+	 * For DT platforms, manually create platform_devices for
+	 * capture/display drivers.
+	 */
+	res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (!res_irq) {
+		dev_warn(&pdev->dev, "Missing IRQ resource.\n");
+		return -EINVAL;
+	}
+
+	pdev_capture = devm_kzalloc(&pdev->dev, sizeof(*pdev_capture),
+				    GFP_KERNEL);
+	if (pdev_capture) {
+		pdev_capture->name = "vpif_capture";
+		pdev_capture->id = -1;
+		pdev_capture->resource = res_irq;
+		pdev_capture->num_resources = 1;
+		pdev_capture->dev.dma_mask = pdev->dev.dma_mask;
+		pdev_capture->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
+		pdev_capture->dev.parent = &pdev->dev;
+		platform_device_register(pdev_capture);
+	} else {
+		dev_warn(&pdev->dev, "Unable to allocate memory for pdev_capture.\n");
+	}
+
+	pdev_display = devm_kzalloc(&pdev->dev, sizeof(*pdev_display),
+				    GFP_KERNEL);
+	if (pdev_display) {
+		pdev_display->name = "vpif_display";
+		pdev_display->id = -1;
+		pdev_display->resource = res_irq;
+		pdev_display->num_resources = 1;
+		pdev_display->dev.dma_mask = pdev->dev.dma_mask;
+		pdev_display->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
+		pdev_display->dev.parent = &pdev->dev;
+		platform_device_register(pdev_display);
+	} else {
+		dev_warn(&pdev->dev, "Unable to allocate memory for pdev_display.\n");
+	}
+
 	return 0;
 }
 
-- 
2.9.3

[PATCH v2] [media] davinci: vpif: adaptions for DT support

[Kevin Hilman]

Hi Hans, Mauro,

On Fri, Jun 9, 2017 at 9:10 AM, Kevin Hilman <khilman@baylibre.com> wrote:
> The davinci VPIF is a single hardware block, but the existing driver
> is broken up into a common library (vpif.c), output (vpif_display.c) and
> intput (vpif_capture.c).
>
> When migrating to DT, to better model the hardware, and because
> registers, interrupts, etc. are all common,it was decided to
> have a single VPIF hardware node[1].
>
> Because davinci uses legacy, non-DT boot on several SoCs still, the
> platform_drivers need to remain.  But they are also needed in DT boot.
> Since there are no DT nodes for the display/capture parts in DT
> boot (there is a single node for the parent/common device) we need to
> create platform_devices somewhere to instansiate the platform_drivers.
>
> When VPIF display/capture are needed for a DT boot, the VPIF node
> will have endpoints defined for its subdevs.  Therefore, vpif_probe()
> checks for the presence of endpoints, and if detected manually creates
> the platform_devices for the display and capture platform_drivers.
>
> [1] Documentation/devicetree/bindings/media/ti,da850-vpif.txt
>
> Signed-off-by: Kevin Hilman <khilman@baylibre.com>

Can this one make it for v4.13 along with the rest of the series that
it was initially sent with?

This one needed a respin for some error checking, but is otherwise
unchanged, and has been tested on top of media/next.

Thanks,

Kevin

Re: [PATCH v2] [media] davinci: vpif: adaptions for DT support

[Kevin Hilman]

Hi Hans, Mauro,

On Fri, Jun 9, 2017 at 9:10 AM, Kevin Hilman <khilman@baylibre.com> wrote:
> The davinci VPIF is a single hardware block, but the existing driver
> is broken up into a common library (vpif.c), output (vpif_display.c) and
> intput (vpif_capture.c).
>
> When migrating to DT, to better model the hardware, and because
> registers, interrupts, etc. are all common,it was decided to
> have a single VPIF hardware node[1].
>
> Because davinci uses legacy, non-DT boot on several SoCs still, the
> platform_drivers need to remain.  But they are also needed in DT boot.
> Since there are no DT nodes for the display/capture parts in DT
> boot (there is a single node for the parent/common device) we need to
> create platform_devices somewhere to instansiate the platform_drivers.
>
> When VPIF display/capture are needed for a DT boot, the VPIF node
> will have endpoints defined for its subdevs.  Therefore, vpif_probe()
> checks for the presence of endpoints, and if detected manually creates
> the platform_devices for the display and capture platform_drivers.
>
> [1] Documentation/devicetree/bindings/media/ti,da850-vpif.txt
>
> Signed-off-by: Kevin Hilman <khilman@baylibre.com>

Can this one make it for v4.13 along with the rest of the series that
it was initially sent with?

This one needed a respin for some error checking, but is otherwise
unchanged, and has been tested on top of media/next.

Thanks,

Kevin

[PATCH v2] [media] davinci: vpif: adaptions for DT support

[Sakari Ailus]

Hi Kevin,

On Fri, Jun 09, 2017 at 09:10:26AM -0700, Kevin Hilman wrote:
> The davinci VPIF is a single hardware block, but the existing driver
> is broken up into a common library (vpif.c), output (vpif_display.c) and
> intput (vpif_capture.c).
> 
> When migrating to DT, to better model the hardware, and because
> registers, interrupts, etc. are all common,it was decided to
> have a single VPIF hardware node[1].
> 
> Because davinci uses legacy, non-DT boot on several SoCs still, the
> platform_drivers need to remain.  But they are also needed in DT boot.
> Since there are no DT nodes for the display/capture parts in DT
> boot (there is a single node for the parent/common device) we need to
> create platform_devices somewhere to instansiate the platform_drivers.
> 
> When VPIF display/capture are needed for a DT boot, the VPIF node
> will have endpoints defined for its subdevs.  Therefore, vpif_probe()
> checks for the presence of endpoints, and if detected manually creates
> the platform_devices for the display and capture platform_drivers.
> 
> [1] Documentation/devicetree/bindings/media/ti,da850-vpif.txt
> 
> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
> ---
> Changes since v1:
> - added proper error checking to kzalloc calls
> - rebased onto media/master
> 
>  drivers/media/platform/davinci/vpif.c | 57 ++++++++++++++++++++++++++++++++++-
>  1 file changed, 56 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/davinci/vpif.c b/drivers/media/platform/davinci/vpif.c
> index 1b02a6363f77..c2d214dfaa3e 100644
> --- a/drivers/media/platform/davinci/vpif.c
> +++ b/drivers/media/platform/davinci/vpif.c
> @@ -26,6 +26,7 @@
>  #include <linux/pm_runtime.h>
>  #include <linux/spinlock.h>
>  #include <linux/v4l2-dv-timings.h>
> +#include <linux/of_graph.h>
>  
>  #include "vpif.h"
>  
> @@ -423,7 +424,9 @@ EXPORT_SYMBOL(vpif_channel_getfid);
>  
>  static int vpif_probe(struct platform_device *pdev)
>  {
> -	static struct resource	*res;
> +	static struct resource	*res, *res_irq;
> +	struct platform_device *pdev_capture, *pdev_display;
> +	struct device_node *endpoint = NULL;
>  
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	vpif_base = devm_ioremap_resource(&pdev->dev, res);
> @@ -435,6 +438,58 @@ static int vpif_probe(struct platform_device *pdev)
>  
>  	spin_lock_init(&vpif_lock);
>  	dev_info(&pdev->dev, "vpif probe success\n");
> +
> +	/*
> +	 * If VPIF Node has endpoints, assume "new" DT support,
> +	 * where capture and display drivers don't have DT nodes
> +	 * so their devices need to be registered manually here
> +	 * for their legacy platform_drivers to work.
> +	 */
> +	endpoint = of_graph_get_next_endpoint(pdev->dev.of_node,
> +					      endpoint);
> +	if (!endpoint) 
> +		return 0;
> +
> +	/*
> +	 * For DT platforms, manually create platform_devices for
> +	 * capture/display drivers.
> +	 */
> +	res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> +	if (!res_irq) {
> +		dev_warn(&pdev->dev, "Missing IRQ resource.\n");
> +		return -EINVAL;
> +	}
> +
> +	pdev_capture = devm_kzalloc(&pdev->dev, sizeof(*pdev_capture),
> +				    GFP_KERNEL);
> +	if (pdev_capture) {
> +		pdev_capture->name = "vpif_capture";
> +		pdev_capture->id = -1;
> +		pdev_capture->resource = res_irq;
> +		pdev_capture->num_resources = 1;
> +		pdev_capture->dev.dma_mask = pdev->dev.dma_mask;
> +		pdev_capture->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
> +		pdev_capture->dev.parent = &pdev->dev;
> +		platform_device_register(pdev_capture);

Don't both of these (vpif_capture and vpif_display) depend on platform data?
Or do I miss something?

> +	} else {
> +		dev_warn(&pdev->dev, "Unable to allocate memory for pdev_capture.\n");
> +	}
> +
> +	pdev_display = devm_kzalloc(&pdev->dev, sizeof(*pdev_display),
> +				    GFP_KERNEL);
> +	if (pdev_display) {
> +		pdev_display->name = "vpif_display";
> +		pdev_display->id = -1;
> +		pdev_display->resource = res_irq;
> +		pdev_display->num_resources = 1;
> +		pdev_display->dev.dma_mask = pdev->dev.dma_mask;
> +		pdev_display->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
> +		pdev_display->dev.parent = &pdev->dev;
> +		platform_device_register(pdev_display);
> +	} else {
> +		dev_warn(&pdev->dev, "Unable to allocate memory for pdev_display.\n");
> +	}
> +
>  	return 0;
>  }
>  

-- 
Regards,

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

Re: [PATCH v2] [media] davinci: vpif: adaptions for DT support

[Sakari Ailus]

Hi Kevin,

On Fri, Jun 09, 2017 at 09:10:26AM -0700, Kevin Hilman wrote:
> The davinci VPIF is a single hardware block, but the existing driver
> is broken up into a common library (vpif.c), output (vpif_display.c) and
> intput (vpif_capture.c).
> 
> When migrating to DT, to better model the hardware, and because
> registers, interrupts, etc. are all common,it was decided to
> have a single VPIF hardware node[1].
> 
> Because davinci uses legacy, non-DT boot on several SoCs still, the
> platform_drivers need to remain.  But they are also needed in DT boot.
> Since there are no DT nodes for the display/capture parts in DT
> boot (there is a single node for the parent/common device) we need to
> create platform_devices somewhere to instansiate the platform_drivers.
> 
> When VPIF display/capture are needed for a DT boot, the VPIF node
> will have endpoints defined for its subdevs.  Therefore, vpif_probe()
> checks for the presence of endpoints, and if detected manually creates
> the platform_devices for the display and capture platform_drivers.
> 
> [1] Documentation/devicetree/bindings/media/ti,da850-vpif.txt
> 
> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
> ---
> Changes since v1:
> - added proper error checking to kzalloc calls
> - rebased onto media/master
> 
>  drivers/media/platform/davinci/vpif.c | 57 ++++++++++++++++++++++++++++++++++-
>  1 file changed, 56 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/davinci/vpif.c b/drivers/media/platform/davinci/vpif.c
> index 1b02a6363f77..c2d214dfaa3e 100644
> --- a/drivers/media/platform/davinci/vpif.c
> +++ b/drivers/media/platform/davinci/vpif.c
> @@ -26,6 +26,7 @@
>  #include <linux/pm_runtime.h>
>  #include <linux/spinlock.h>
>  #include <linux/v4l2-dv-timings.h>
> +#include <linux/of_graph.h>
>  
>  #include "vpif.h"
>  
> @@ -423,7 +424,9 @@ EXPORT_SYMBOL(vpif_channel_getfid);
>  
>  static int vpif_probe(struct platform_device *pdev)
>  {
> -	static struct resource	*res;
> +	static struct resource	*res, *res_irq;
> +	struct platform_device *pdev_capture, *pdev_display;
> +	struct device_node *endpoint = NULL;
>  
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	vpif_base = devm_ioremap_resource(&pdev->dev, res);
> @@ -435,6 +438,58 @@ static int vpif_probe(struct platform_device *pdev)
>  
>  	spin_lock_init(&vpif_lock);
>  	dev_info(&pdev->dev, "vpif probe success\n");
> +
> +	/*
> +	 * If VPIF Node has endpoints, assume "new" DT support,
> +	 * where capture and display drivers don't have DT nodes
> +	 * so their devices need to be registered manually here
> +	 * for their legacy platform_drivers to work.
> +	 */
> +	endpoint = of_graph_get_next_endpoint(pdev->dev.of_node,
> +					      endpoint);
> +	if (!endpoint) 
> +		return 0;
> +
> +	/*
> +	 * For DT platforms, manually create platform_devices for
> +	 * capture/display drivers.
> +	 */
> +	res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> +	if (!res_irq) {
> +		dev_warn(&pdev->dev, "Missing IRQ resource.\n");
> +		return -EINVAL;
> +	}
> +
> +	pdev_capture = devm_kzalloc(&pdev->dev, sizeof(*pdev_capture),
> +				    GFP_KERNEL);
> +	if (pdev_capture) {
> +		pdev_capture->name = "vpif_capture";
> +		pdev_capture->id = -1;
> +		pdev_capture->resource = res_irq;
> +		pdev_capture->num_resources = 1;
> +		pdev_capture->dev.dma_mask = pdev->dev.dma_mask;
> +		pdev_capture->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
> +		pdev_capture->dev.parent = &pdev->dev;
> +		platform_device_register(pdev_capture);

Don't both of these (vpif_capture and vpif_display) depend on platform data?
Or do I miss something?

> +	} else {
> +		dev_warn(&pdev->dev, "Unable to allocate memory for pdev_capture.\n");
> +	}
> +
> +	pdev_display = devm_kzalloc(&pdev->dev, sizeof(*pdev_display),
> +				    GFP_KERNEL);
> +	if (pdev_display) {
> +		pdev_display->name = "vpif_display";
> +		pdev_display->id = -1;
> +		pdev_display->resource = res_irq;
> +		pdev_display->num_resources = 1;
> +		pdev_display->dev.dma_mask = pdev->dev.dma_mask;
> +		pdev_display->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
> +		pdev_display->dev.parent = &pdev->dev;
> +		platform_device_register(pdev_display);
> +	} else {
> +		dev_warn(&pdev->dev, "Unable to allocate memory for pdev_display.\n");
> +	}
> +
>  	return 0;
>  }
>  

-- 
Regards,

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

[PATCH v2] [media] davinci: vpif: adaptions for DT support

[Kevin Hilman]

Sakari Ailus <sakari.ailus@iki.fi> writes:

> Hi Kevin,
>
> On Fri, Jun 09, 2017 at 09:10:26AM -0700, Kevin Hilman wrote:
>> The davinci VPIF is a single hardware block, but the existing driver
>> is broken up into a common library (vpif.c), output (vpif_display.c) and
>> intput (vpif_capture.c).
>> 
>> When migrating to DT, to better model the hardware, and because
>> registers, interrupts, etc. are all common,it was decided to
>> have a single VPIF hardware node[1].
>> 
>> Because davinci uses legacy, non-DT boot on several SoCs still, the
>> platform_drivers need to remain.  But they are also needed in DT boot.
>> Since there are no DT nodes for the display/capture parts in DT
>> boot (there is a single node for the parent/common device) we need to
>> create platform_devices somewhere to instansiate the platform_drivers.
>> 
>> When VPIF display/capture are needed for a DT boot, the VPIF node
>> will have endpoints defined for its subdevs.  Therefore, vpif_probe()
>> checks for the presence of endpoints, and if detected manually creates
>> the platform_devices for the display and capture platform_drivers.
>> 
>> [1] Documentation/devicetree/bindings/media/ti,da850-vpif.txt
>> 
>> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
>> ---
>> Changes since v1:
>> - added proper error checking to kzalloc calls
>> - rebased onto media/master
>> 
>>  drivers/media/platform/davinci/vpif.c | 57 ++++++++++++++++++++++++++++++++++-
>>  1 file changed, 56 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/media/platform/davinci/vpif.c b/drivers/media/platform/davinci/vpif.c
>> index 1b02a6363f77..c2d214dfaa3e 100644
>> --- a/drivers/media/platform/davinci/vpif.c
>> +++ b/drivers/media/platform/davinci/vpif.c
>> @@ -26,6 +26,7 @@
>>  #include <linux/pm_runtime.h>
>>  #include <linux/spinlock.h>
>>  #include <linux/v4l2-dv-timings.h>
>> +#include <linux/of_graph.h>
>>  
>>  #include "vpif.h"
>>  
>> @@ -423,7 +424,9 @@ EXPORT_SYMBOL(vpif_channel_getfid);
>>  
>>  static int vpif_probe(struct platform_device *pdev)
>>  {
>> -	static struct resource	*res;
>> +	static struct resource	*res, *res_irq;
>> +	struct platform_device *pdev_capture, *pdev_display;
>> +	struct device_node *endpoint = NULL;
>>  
>>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>  	vpif_base = devm_ioremap_resource(&pdev->dev, res);
>> @@ -435,6 +438,58 @@ static int vpif_probe(struct platform_device *pdev)
>>  
>>  	spin_lock_init(&vpif_lock);
>>  	dev_info(&pdev->dev, "vpif probe success\n");
>> +
>> +	/*
>> +	 * If VPIF Node has endpoints, assume "new" DT support,
>> +	 * where capture and display drivers don't have DT nodes
>> +	 * so their devices need to be registered manually here
>> +	 * for their legacy platform_drivers to work.
>> +	 */
>> +	endpoint = of_graph_get_next_endpoint(pdev->dev.of_node,
>> +					      endpoint);
>> +	if (!endpoint) 
>> +		return 0;
>> +
>> +	/*
>> +	 * For DT platforms, manually create platform_devices for
>> +	 * capture/display drivers.
>> +	 */
>> +	res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
>> +	if (!res_irq) {
>> +		dev_warn(&pdev->dev, "Missing IRQ resource.\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	pdev_capture = devm_kzalloc(&pdev->dev, sizeof(*pdev_capture),
>> +				    GFP_KERNEL);
>> +	if (pdev_capture) {
>> +		pdev_capture->name = "vpif_capture";
>> +		pdev_capture->id = -1;
>> +		pdev_capture->resource = res_irq;
>> +		pdev_capture->num_resources = 1;
>> +		pdev_capture->dev.dma_mask = pdev->dev.dma_mask;
>> +		pdev_capture->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
>> +		pdev_capture->dev.parent = &pdev->dev;
>> +		platform_device_register(pdev_capture);
>
> Don't both of these (vpif_capture and vpif_display) depend on platform data?
> Or do I miss something?

The driver can (continue to) work in legacy mode with platform_data.  In
that case, there is no VPIF DT node (or a node without endpoints).

However, with recent changes, it can also work in DT mode, where the
VPIF node and endpoints used for display/capture come from DT, in which
case these nodes are created an don't depend on platform_data at all.

Hope that clarifies things, and thanks for the review,

Kevin

Re: [PATCH v2] [media] davinci: vpif: adaptions for DT support

[Kevin Hilman]

Sakari Ailus <sakari.ailus@iki.fi> writes:

> Hi Kevin,
>
> On Fri, Jun 09, 2017 at 09:10:26AM -0700, Kevin Hilman wrote:
>> The davinci VPIF is a single hardware block, but the existing driver
>> is broken up into a common library (vpif.c), output (vpif_display.c) and
>> intput (vpif_capture.c).
>> 
>> When migrating to DT, to better model the hardware, and because
>> registers, interrupts, etc. are all common,it was decided to
>> have a single VPIF hardware node[1].
>> 
>> Because davinci uses legacy, non-DT boot on several SoCs still, the
>> platform_drivers need to remain.  But they are also needed in DT boot.
>> Since there are no DT nodes for the display/capture parts in DT
>> boot (there is a single node for the parent/common device) we need to
>> create platform_devices somewhere to instansiate the platform_drivers.
>> 
>> When VPIF display/capture are needed for a DT boot, the VPIF node
>> will have endpoints defined for its subdevs.  Therefore, vpif_probe()
>> checks for the presence of endpoints, and if detected manually creates
>> the platform_devices for the display and capture platform_drivers.
>> 
>> [1] Documentation/devicetree/bindings/media/ti,da850-vpif.txt
>> 
>> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
>> ---
>> Changes since v1:
>> - added proper error checking to kzalloc calls
>> - rebased onto media/master
>> 
>>  drivers/media/platform/davinci/vpif.c | 57 ++++++++++++++++++++++++++++++++++-
>>  1 file changed, 56 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/media/platform/davinci/vpif.c b/drivers/media/platform/davinci/vpif.c
>> index 1b02a6363f77..c2d214dfaa3e 100644
>> --- a/drivers/media/platform/davinci/vpif.c
>> +++ b/drivers/media/platform/davinci/vpif.c
>> @@ -26,6 +26,7 @@
>>  #include <linux/pm_runtime.h>
>>  #include <linux/spinlock.h>
>>  #include <linux/v4l2-dv-timings.h>
>> +#include <linux/of_graph.h>
>>  
>>  #include "vpif.h"
>>  
>> @@ -423,7 +424,9 @@ EXPORT_SYMBOL(vpif_channel_getfid);
>>  
>>  static int vpif_probe(struct platform_device *pdev)
>>  {
>> -	static struct resource	*res;
>> +	static struct resource	*res, *res_irq;
>> +	struct platform_device *pdev_capture, *pdev_display;
>> +	struct device_node *endpoint = NULL;
>>  
>>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>  	vpif_base = devm_ioremap_resource(&pdev->dev, res);
>> @@ -435,6 +438,58 @@ static int vpif_probe(struct platform_device *pdev)
>>  
>>  	spin_lock_init(&vpif_lock);
>>  	dev_info(&pdev->dev, "vpif probe success\n");
>> +
>> +	/*
>> +	 * If VPIF Node has endpoints, assume "new" DT support,
>> +	 * where capture and display drivers don't have DT nodes
>> +	 * so their devices need to be registered manually here
>> +	 * for their legacy platform_drivers to work.
>> +	 */
>> +	endpoint = of_graph_get_next_endpoint(pdev->dev.of_node,
>> +					      endpoint);
>> +	if (!endpoint) 
>> +		return 0;
>> +
>> +	/*
>> +	 * For DT platforms, manually create platform_devices for
>> +	 * capture/display drivers.
>> +	 */
>> +	res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
>> +	if (!res_irq) {
>> +		dev_warn(&pdev->dev, "Missing IRQ resource.\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	pdev_capture = devm_kzalloc(&pdev->dev, sizeof(*pdev_capture),
>> +				    GFP_KERNEL);
>> +	if (pdev_capture) {
>> +		pdev_capture->name = "vpif_capture";
>> +		pdev_capture->id = -1;
>> +		pdev_capture->resource = res_irq;
>> +		pdev_capture->num_resources = 1;
>> +		pdev_capture->dev.dma_mask = pdev->dev.dma_mask;
>> +		pdev_capture->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
>> +		pdev_capture->dev.parent = &pdev->dev;
>> +		platform_device_register(pdev_capture);
>
> Don't both of these (vpif_capture and vpif_display) depend on platform data?
> Or do I miss something?

The driver can (continue to) work in legacy mode with platform_data.  In
that case, there is no VPIF DT node (or a node without endpoints).

However, with recent changes, it can also work in DT mode, where the
VPIF node and endpoints used for display/capture come from DT, in which
case these nodes are created an don't depend on platform_data at all.

Hope that clarifies things, and thanks for the review,

Kevin

[PATCH v2] [media] davinci: vpif: adaptions for DT support

[Sakari Ailus]

On Fri, Jun 16, 2017 at 10:49:24AM -0700, Kevin Hilman wrote:
> Sakari Ailus <sakari.ailus@iki.fi> writes:
> 
> > Hi Kevin,
> >
> > On Fri, Jun 09, 2017 at 09:10:26AM -0700, Kevin Hilman wrote:
> >> The davinci VPIF is a single hardware block, but the existing driver
> >> is broken up into a common library (vpif.c), output (vpif_display.c) and
> >> intput (vpif_capture.c).
> >> 
> >> When migrating to DT, to better model the hardware, and because
> >> registers, interrupts, etc. are all common,it was decided to
> >> have a single VPIF hardware node[1].
> >> 
> >> Because davinci uses legacy, non-DT boot on several SoCs still, the
> >> platform_drivers need to remain.  But they are also needed in DT boot.
> >> Since there are no DT nodes for the display/capture parts in DT
> >> boot (there is a single node for the parent/common device) we need to
> >> create platform_devices somewhere to instansiate the platform_drivers.
> >> 
> >> When VPIF display/capture are needed for a DT boot, the VPIF node
> >> will have endpoints defined for its subdevs.  Therefore, vpif_probe()
> >> checks for the presence of endpoints, and if detected manually creates
> >> the platform_devices for the display and capture platform_drivers.
> >> 
> >> [1] Documentation/devicetree/bindings/media/ti,da850-vpif.txt
> >> 
> >> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
> >> ---
> >> Changes since v1:
> >> - added proper error checking to kzalloc calls
> >> - rebased onto media/master
> >> 
> >>  drivers/media/platform/davinci/vpif.c | 57 ++++++++++++++++++++++++++++++++++-
> >>  1 file changed, 56 insertions(+), 1 deletion(-)
> >> 
> >> diff --git a/drivers/media/platform/davinci/vpif.c b/drivers/media/platform/davinci/vpif.c
> >> index 1b02a6363f77..c2d214dfaa3e 100644
> >> --- a/drivers/media/platform/davinci/vpif.c
> >> +++ b/drivers/media/platform/davinci/vpif.c
> >> @@ -26,6 +26,7 @@
> >>  #include <linux/pm_runtime.h>
> >>  #include <linux/spinlock.h>
> >>  #include <linux/v4l2-dv-timings.h>
> >> +#include <linux/of_graph.h>
> >>  
> >>  #include "vpif.h"
> >>  
> >> @@ -423,7 +424,9 @@ EXPORT_SYMBOL(vpif_channel_getfid);
> >>  
> >>  static int vpif_probe(struct platform_device *pdev)
> >>  {
> >> -	static struct resource	*res;
> >> +	static struct resource	*res, *res_irq;
> >> +	struct platform_device *pdev_capture, *pdev_display;
> >> +	struct device_node *endpoint = NULL;
> >>  
> >>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> >>  	vpif_base = devm_ioremap_resource(&pdev->dev, res);
> >> @@ -435,6 +438,58 @@ static int vpif_probe(struct platform_device *pdev)
> >>  
> >>  	spin_lock_init(&vpif_lock);
> >>  	dev_info(&pdev->dev, "vpif probe success\n");
> >> +
> >> +	/*
> >> +	 * If VPIF Node has endpoints, assume "new" DT support,
> >> +	 * where capture and display drivers don't have DT nodes
> >> +	 * so their devices need to be registered manually here
> >> +	 * for their legacy platform_drivers to work.
> >> +	 */
> >> +	endpoint = of_graph_get_next_endpoint(pdev->dev.of_node,
> >> +					      endpoint);
> >> +	if (!endpoint) 
> >> +		return 0;
> >> +
> >> +	/*
> >> +	 * For DT platforms, manually create platform_devices for
> >> +	 * capture/display drivers.
> >> +	 */
> >> +	res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> >> +	if (!res_irq) {
> >> +		dev_warn(&pdev->dev, "Missing IRQ resource.\n");
> >> +		return -EINVAL;
> >> +	}
> >> +
> >> +	pdev_capture = devm_kzalloc(&pdev->dev, sizeof(*pdev_capture),
> >> +				    GFP_KERNEL);
> >> +	if (pdev_capture) {
> >> +		pdev_capture->name = "vpif_capture";
> >> +		pdev_capture->id = -1;
> >> +		pdev_capture->resource = res_irq;
> >> +		pdev_capture->num_resources = 1;
> >> +		pdev_capture->dev.dma_mask = pdev->dev.dma_mask;
> >> +		pdev_capture->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
> >> +		pdev_capture->dev.parent = &pdev->dev;
> >> +		platform_device_register(pdev_capture);
> >
> > Don't both of these (vpif_capture and vpif_display) depend on platform data?
> > Or do I miss something?
> 
> The driver can (continue to) work in legacy mode with platform_data.  In
> that case, there is no VPIF DT node (or a node without endpoints).
> 
> However, with recent changes, it can also work in DT mode, where the
> VPIF node and endpoints used for display/capture come from DT, in which
> case these nodes are created an don't depend on platform_data at all.
> 
> Hope that clarifies things, and thanks for the review,

Oh, I think I missed the fact that what is parsed from DT is still referred
to as platform data in the driver. (Both of the drivers are testing if
dev->platform_data is non-NULL twice in a row. Unrelated to this patch, just
FYI.)

How do the newly created child devices get their OF nodes?

If endpoint is non-NULL, it needs to be put using of_node_put().

-- 
Regards,

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

Re: [PATCH v2] [media] davinci: vpif: adaptions for DT support

[Sakari Ailus]

On Fri, Jun 16, 2017 at 10:49:24AM -0700, Kevin Hilman wrote:
> Sakari Ailus <sakari.ailus@iki.fi> writes:
> 
> > Hi Kevin,
> >
> > On Fri, Jun 09, 2017 at 09:10:26AM -0700, Kevin Hilman wrote:
> >> The davinci VPIF is a single hardware block, but the existing driver
> >> is broken up into a common library (vpif.c), output (vpif_display.c) and
> >> intput (vpif_capture.c).
> >> 
> >> When migrating to DT, to better model the hardware, and because
> >> registers, interrupts, etc. are all common,it was decided to
> >> have a single VPIF hardware node[1].
> >> 
> >> Because davinci uses legacy, non-DT boot on several SoCs still, the
> >> platform_drivers need to remain.  But they are also needed in DT boot.
> >> Since there are no DT nodes for the display/capture parts in DT
> >> boot (there is a single node for the parent/common device) we need to
> >> create platform_devices somewhere to instansiate the platform_drivers.
> >> 
> >> When VPIF display/capture are needed for a DT boot, the VPIF node
> >> will have endpoints defined for its subdevs.  Therefore, vpif_probe()
> >> checks for the presence of endpoints, and if detected manually creates
> >> the platform_devices for the display and capture platform_drivers.
> >> 
> >> [1] Documentation/devicetree/bindings/media/ti,da850-vpif.txt
> >> 
> >> Signed-off-by: Kevin Hilman <khilman@baylibre.com>
> >> ---
> >> Changes since v1:
> >> - added proper error checking to kzalloc calls
> >> - rebased onto media/master
> >> 
> >>  drivers/media/platform/davinci/vpif.c | 57 ++++++++++++++++++++++++++++++++++-
> >>  1 file changed, 56 insertions(+), 1 deletion(-)
> >> 
> >> diff --git a/drivers/media/platform/davinci/vpif.c b/drivers/media/platform/davinci/vpif.c
> >> index 1b02a6363f77..c2d214dfaa3e 100644
> >> --- a/drivers/media/platform/davinci/vpif.c
> >> +++ b/drivers/media/platform/davinci/vpif.c
> >> @@ -26,6 +26,7 @@
> >>  #include <linux/pm_runtime.h>
> >>  #include <linux/spinlock.h>
> >>  #include <linux/v4l2-dv-timings.h>
> >> +#include <linux/of_graph.h>
> >>  
> >>  #include "vpif.h"
> >>  
> >> @@ -423,7 +424,9 @@ EXPORT_SYMBOL(vpif_channel_getfid);
> >>  
> >>  static int vpif_probe(struct platform_device *pdev)
> >>  {
> >> -	static struct resource	*res;
> >> +	static struct resource	*res, *res_irq;
> >> +	struct platform_device *pdev_capture, *pdev_display;
> >> +	struct device_node *endpoint = NULL;
> >>  
> >>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> >>  	vpif_base = devm_ioremap_resource(&pdev->dev, res);
> >> @@ -435,6 +438,58 @@ static int vpif_probe(struct platform_device *pdev)
> >>  
> >>  	spin_lock_init(&vpif_lock);
> >>  	dev_info(&pdev->dev, "vpif probe success\n");
> >> +
> >> +	/*
> >> +	 * If VPIF Node has endpoints, assume "new" DT support,
> >> +	 * where capture and display drivers don't have DT nodes
> >> +	 * so their devices need to be registered manually here
> >> +	 * for their legacy platform_drivers to work.
> >> +	 */
> >> +	endpoint = of_graph_get_next_endpoint(pdev->dev.of_node,
> >> +					      endpoint);
> >> +	if (!endpoint) 
> >> +		return 0;
> >> +
> >> +	/*
> >> +	 * For DT platforms, manually create platform_devices for
> >> +	 * capture/display drivers.
> >> +	 */
> >> +	res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> >> +	if (!res_irq) {
> >> +		dev_warn(&pdev->dev, "Missing IRQ resource.\n");
> >> +		return -EINVAL;
> >> +	}
> >> +
> >> +	pdev_capture = devm_kzalloc(&pdev->dev, sizeof(*pdev_capture),
> >> +				    GFP_KERNEL);
> >> +	if (pdev_capture) {
> >> +		pdev_capture->name = "vpif_capture";
> >> +		pdev_capture->id = -1;
> >> +		pdev_capture->resource = res_irq;
> >> +		pdev_capture->num_resources = 1;
> >> +		pdev_capture->dev.dma_mask = pdev->dev.dma_mask;
> >> +		pdev_capture->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
> >> +		pdev_capture->dev.parent = &pdev->dev;
> >> +		platform_device_register(pdev_capture);
> >
> > Don't both of these (vpif_capture and vpif_display) depend on platform data?
> > Or do I miss something?
> 
> The driver can (continue to) work in legacy mode with platform_data.  In
> that case, there is no VPIF DT node (or a node without endpoints).
> 
> However, with recent changes, it can also work in DT mode, where the
> VPIF node and endpoints used for display/capture come from DT, in which
> case these nodes are created an don't depend on platform_data at all.
> 
> Hope that clarifies things, and thanks for the review,

Oh, I think I missed the fact that what is parsed from DT is still referred
to as platform data in the driver. (Both of the drivers are testing if
dev->platform_data is non-NULL twice in a row. Unrelated to this patch, just
FYI.)

How do the newly created child devices get their OF nodes?

If endpoint is non-NULL, it needs to be put using of_node_put().

-- 
Regards,

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

[PATCH v2] [media] davinci: vpif: adaptions for DT support

[Sylwester Nawrocki]

On 06/09/2017 06:10 PM, Kevin Hilman wrote:
> The davinci VPIF is a single hardware block, but the existing driver
> is broken up into a common library (vpif.c), output (vpif_display.c) and
> intput (vpif_capture.c).
> 
> When migrating to DT, to better model the hardware, and because
> registers, interrupts, etc. are all common,it was decided to
> have a single VPIF hardware node[1].
> 
> Because davinci uses legacy, non-DT boot on several SoCs still, the
> platform_drivers need to remain.  But they are also needed in DT boot.
> Since there are no DT nodes for the display/capture parts in DT
> boot (there is a single node for the parent/common device) we need to
> create platform_devices somewhere to instansiate the platform_drivers.
> 
> When VPIF display/capture are needed for a DT boot, the VPIF node
> will have endpoints defined for its subdevs.  Therefore, vpif_probe()
> checks for the presence of endpoints, and if detected manually creates
> the platform_devices for the display and capture platform_drivers.
> 
> [1] Documentation/devicetree/bindings/media/ti,da850-vpif.txt
> 
> Signed-off-by: Kevin Hilman <khilman@baylibre.com>

Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>


-- 
Regards,
Sylwester

Re: [PATCH v2] [media] davinci: vpif: adaptions for DT support

[Sylwester Nawrocki]

On 06/09/2017 06:10 PM, Kevin Hilman wrote:
> The davinci VPIF is a single hardware block, but the existing driver
> is broken up into a common library (vpif.c), output (vpif_display.c) and
> intput (vpif_capture.c).
> 
> When migrating to DT, to better model the hardware, and because
> registers, interrupts, etc. are all common,it was decided to
> have a single VPIF hardware node[1].
> 
> Because davinci uses legacy, non-DT boot on several SoCs still, the
> platform_drivers need to remain.  But they are also needed in DT boot.
> Since there are no DT nodes for the display/capture parts in DT
> boot (there is a single node for the parent/common device) we need to
> create platform_devices somewhere to instansiate the platform_drivers.
> 
> When VPIF display/capture are needed for a DT boot, the VPIF node
> will have endpoints defined for its subdevs.  Therefore, vpif_probe()
> checks for the presence of endpoints, and if detected manually creates
> the platform_devices for the display and capture platform_drivers.
> 
> [1] Documentation/devicetree/bindings/media/ti,da850-vpif.txt
> 
> Signed-off-by: Kevin Hilman <khilman@baylibre.com>

Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>


-- 
Regards,
Sylwester

[PATCH v2] [media] davinci: vpif: adaptions for DT support

[Lad, Prabhakar]

On Fri, Jun 9, 2017 at 5:10 PM, Kevin Hilman <khilman@baylibre.com> wrote:
> The davinci VPIF is a single hardware block, but the existing driver
> is broken up into a common library (vpif.c), output (vpif_display.c) and
> intput (vpif_capture.c).
>
> When migrating to DT, to better model the hardware, and because
> registers, interrupts, etc. are all common,it was decided to
> have a single VPIF hardware node[1].
>
> Because davinci uses legacy, non-DT boot on several SoCs still, the
> platform_drivers need to remain.  But they are also needed in DT boot.
> Since there are no DT nodes for the display/capture parts in DT
> boot (there is a single node for the parent/common device) we need to
> create platform_devices somewhere to instansiate the platform_drivers.
>
> When VPIF display/capture are needed for a DT boot, the VPIF node
> will have endpoints defined for its subdevs.  Therefore, vpif_probe()
> checks for the presence of endpoints, and if detected manually creates
> the platform_devices for the display and capture platform_drivers.
>
> [1] Documentation/devicetree/bindings/media/ti,da850-vpif.txt
>
> Signed-off-by: Kevin Hilman <khilman@baylibre.com>

Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>

Cheers,
--Prabhakar Lad

Re: [PATCH v2] [media] davinci: vpif: adaptions for DT support

[Lad, Prabhakar]

On Fri, Jun 9, 2017 at 5:10 PM, Kevin Hilman <khilman@baylibre.com> wrote:
> The davinci VPIF is a single hardware block, but the existing driver
> is broken up into a common library (vpif.c), output (vpif_display.c) and
> intput (vpif_capture.c).
>
> When migrating to DT, to better model the hardware, and because
> registers, interrupts, etc. are all common,it was decided to
> have a single VPIF hardware node[1].
>
> Because davinci uses legacy, non-DT boot on several SoCs still, the
> platform_drivers need to remain.  But they are also needed in DT boot.
> Since there are no DT nodes for the display/capture parts in DT
> boot (there is a single node for the parent/common device) we need to
> create platform_devices somewhere to instansiate the platform_drivers.
>
> When VPIF display/capture are needed for a DT boot, the VPIF node
> will have endpoints defined for its subdevs.  Therefore, vpif_probe()
> checks for the presence of endpoints, and if detected manually creates
> the platform_devices for the display and capture platform_drivers.
>
> [1] Documentation/devicetree/bindings/media/ti,da850-vpif.txt
>
> Signed-off-by: Kevin Hilman <khilman@baylibre.com>

Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>

Cheers,
--Prabhakar Lad