Patchwork ARM : i.MX27 : split code for allocation of ressources of camera and eMMA

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Submitter Gaëtan Carlier
Date Sept. 4, 2012, 12:56 p.m.
Message ID <1346763398-13536-1-git-send-email-gcembed@gmail.com>
Download mbox | patch
Permalink /patch/181551/
State New
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Comments

Gaëtan Carlier - Sept. 4, 2012, 12:56 p.m.
IMX_HAVE_PLATFORM_MX2_EMMA define has been added.

Signed-off-by: Gaëtan Carlier <gcembed@gmail.com>
---
 arch/arm/mach-imx/devices-imx27.h               |    4 ++-
 arch/arm/plat-mxc/devices/Kconfig               |    3 ++
 arch/arm/plat-mxc/devices/Makefile              |    1 +
 arch/arm/plat-mxc/devices/platform-mx2-camera.c |   17 ---------
 arch/arm/plat-mxc/devices/platform-mx2-emma.c   |   41 +++++++++++++++++++++++
 arch/arm/plat-mxc/include/mach/devices-common.h |    9 ++++-
 6 files changed, 56 insertions(+), 19 deletions(-)
 create mode 100644 arch/arm/plat-mxc/devices/platform-mx2-emma.c
Javier Martin - Sept. 5, 2012, 6:49 a.m.
Hi Gaëtan,
is there any real technical reason to do this or is the patch only for
cosmetic purposes?

The following patch, which is meant to go through the linux-media
tree, adds support for mx2_emmaprp in the Visstrim_M10 boards:
https://patchwork.kernel.org/patch/1347921/

Could you please add the flag IMX_HAVE_PLATFORM_MX2_EMMA for the
Visstrim_M10 board in this patch?

On 4 September 2012 14:56, Gaëtan Carlier <gcembed@gmail.com> wrote:
> IMX_HAVE_PLATFORM_MX2_EMMA define has been added.
>
> Signed-off-by: Gaëtan Carlier <gcembed@gmail.com>
> ---
>  arch/arm/mach-imx/devices-imx27.h               |    4 ++-
>  arch/arm/plat-mxc/devices/Kconfig               |    3 ++
>  arch/arm/plat-mxc/devices/Makefile              |    1 +
>  arch/arm/plat-mxc/devices/platform-mx2-camera.c |   17 ---------
>  arch/arm/plat-mxc/devices/platform-mx2-emma.c   |   41 +++++++++++++++++++++++
>  arch/arm/plat-mxc/include/mach/devices-common.h |    9 ++++-
>  6 files changed, 56 insertions(+), 19 deletions(-)
>  create mode 100644 arch/arm/plat-mxc/devices/platform-mx2-emma.c
>
> diff --git a/arch/arm/mach-imx/devices-imx27.h b/arch/arm/mach-imx/devices-imx27.h
> index 0482293..d8eb4a0 100644
> --- a/arch/arm/mach-imx/devices-imx27.h
> +++ b/arch/arm/mach-imx/devices-imx27.h
> @@ -54,8 +54,10 @@ extern const struct imx_imx_uart_1irq_data imx27_imx_uart_data[];
>  extern const struct imx_mx2_camera_data imx27_mx2_camera_data;
>  #define imx27_add_mx2_camera(pdata)    \
>         imx_add_mx2_camera(&imx27_mx2_camera_data, pdata)
> +
> +extern const struct imx_mx2_emma_data imx27_mx2_emmaprp_data;
>  #define imx27_add_mx2_emmaprp()        \
> -       imx_add_mx2_emmaprp(&imx27_mx2_camera_data)
> +       imx_add_mx2_emmaprp(&imx27_mx2_emmaprp_data)
>
>  extern const struct imx_mxc_ehci_data imx27_mxc_ehci_otg_data;
>  #define imx27_add_mxc_ehci_otg(pdata)  \

This chunk doesn't seem ok. What kernel branch are you development against?
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=arch/arm/mach-imx/devices-imx27.h;h=436c5720fe6a40255a2c3bc5ab05378c23855e02;hb=HEAD#l50

> diff --git a/arch/arm/plat-mxc/devices/Kconfig b/arch/arm/plat-mxc/devices/Kconfig
> index 6b46cee..96feef7 100644
> --- a/arch/arm/plat-mxc/devices/Kconfig
> +++ b/arch/arm/plat-mxc/devices/Kconfig
> @@ -56,6 +56,9 @@ config IMX_HAVE_PLATFORM_MX1_CAMERA
>  config IMX_HAVE_PLATFORM_MX2_CAMERA
>         bool
>
> +config IMX_HAVE_PLATFORM_MX2_EMMA
> +       bool
> +
>  config IMX_HAVE_PLATFORM_MXC_EHCI
>         bool
>
> diff --git a/arch/arm/plat-mxc/devices/Makefile b/arch/arm/plat-mxc/devices/Makefile
> index 76f3195..7292c1f 100644
> --- a/arch/arm/plat-mxc/devices/Makefile
> +++ b/arch/arm/plat-mxc/devices/Makefile
> @@ -28,3 +28,4 @@ obj-$(CONFIG_IMX_HAVE_PLATFORM_MXC_W1) += platform-mxc_w1.o
>  obj-$(CONFIG_IMX_HAVE_PLATFORM_SDHCI_ESDHC_IMX) += platform-sdhci-esdhc-imx.o
>  obj-$(CONFIG_IMX_HAVE_PLATFORM_SPI_IMX) +=  platform-spi_imx.o
>  obj-$(CONFIG_IMX_HAVE_PLATFORM_AHCI) +=  platform-ahci-imx.o
> +obj-$(CONFIG_IMX_HAVE_PLATFORM_MX2_EMMA) += platform-mx2-emma.o
> diff --git a/arch/arm/plat-mxc/devices/platform-mx2-camera.c b/arch/arm/plat-mxc/devices/platform-mx2-camera.c
> index 11eace9..11c688f 100644
> --- a/arch/arm/plat-mxc/devices/platform-mx2-camera.c
> +++ b/arch/arm/plat-mxc/devices/platform-mx2-camera.c
> @@ -63,20 +63,3 @@ struct platform_device *__init imx_add_mx2_camera(
>                         pdata, sizeof(*pdata), DMA_BIT_MASK(32));
>  }
>
> -struct platform_device *__init imx_add_mx2_emmaprp(
> -               const struct imx_mx2_camera_data *data)
> -{
> -       struct resource res[] = {
> -               {
> -                       .start = data->iobaseemmaprp,
> -                       .end = data->iobaseemmaprp + data->iosizeemmaprp - 1,
> -                       .flags = IORESOURCE_MEM,
> -               }, {
> -                       .start = data->irqemmaprp,
> -                       .end = data->irqemmaprp,
> -                       .flags = IORESOURCE_IRQ,
> -               },
> -       };
> -       return imx_add_platform_device_dmamask("m2m-emmaprp", 0,
> -                       res, 2, NULL, 0, DMA_BIT_MASK(32));
> -}
> diff --git a/arch/arm/plat-mxc/devices/platform-mx2-emma.c b/arch/arm/plat-mxc/devices/platform-mx2-emma.c
> new file mode 100644
> index 0000000..a51749a
> --- /dev/null
> +++ b/arch/arm/plat-mxc/devices/platform-mx2-emma.c
> @@ -0,0 +1,41 @@
> +/*
> + * Copyright (C) 2010 Pengutronix
> + * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
> + *
> + * 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.
> + */
> +#include <mach/hardware.h>
> +#include <mach/devices-common.h>
> +
> +#define imx_mx2_emmaprp_data_entry_single(soc)                         \
> +       {                                                               \
> +               .iobase = soc ## _EMMAPRP_BASE_ADDR,                    \
> +               .iosize = SZ_32,                                        \
> +               .irq = soc ## _INT_EMMAPRP,                             \
> +       }
> +
> +#ifdef CONFIG_SOC_IMX27
> +const struct imx_mx2_emma_data imx27_mx2_emmaprp_data __initconst =
> +       imx_mx2_emmaprp_data_entry_single(MX27);
> +#endif /* ifdef CONFIG_SOC_IMX27 */
> +
> +struct platform_device *__init imx_add_mx2_emmaprp(
> +               const struct imx_mx2_emma_data *data)
> +{
> +       struct resource res[] = {
> +               {
> +                       .start = data->iobase,
> +                       .end = data->iobase + data->iosize - 1,
> +                       .flags = IORESOURCE_MEM,
> +               }, {
> +                       .start = data->irq,
> +                       .end = data->irq,
> +                       .flags = IORESOURCE_IRQ,
> +               },
> +       };
> +       return imx_add_platform_device_dmamask("m2m-emmaprp", 0,
> +                       res, 2, NULL, 0, DMA_BIT_MASK(32));
> +}
> +
> diff --git a/arch/arm/plat-mxc/include/mach/devices-common.h b/arch/arm/plat-mxc/include/mach/devices-common.h
> index 762780c..2117072 100644
> --- a/arch/arm/plat-mxc/include/mach/devices-common.h
> +++ b/arch/arm/plat-mxc/include/mach/devices-common.h
> @@ -229,8 +229,15 @@ struct imx_mx2_camera_data {
>  struct platform_device *__init imx_add_mx2_camera(
>                 const struct imx_mx2_camera_data *data,
>                 const struct mx2_camera_platform_data *pdata);
> +
> +
> +struct imx_mx2_emma_data {
> +       resource_size_t iobase;
> +       resource_size_t iosize;
> +       resource_size_t irq;
> +};
>  struct platform_device *__init imx_add_mx2_emmaprp(
> -               const struct imx_mx2_camera_data *data);
> +               const struct imx_mx2_emma_data *data);
>
>  #include <mach/mxc_ehci.h>
>  struct imx_mxc_ehci_data {
> --
> 1.7.7.4
>

Regards.
Gaëtan Carlier - Sept. 5, 2012, 7:37 a.m.
Hi Javier,
This is because I will send a patch to add support of eMMA-PP. eMMA-PrP 
is not only used for soc-camera. It can also be used as stand-alone 
driver and now to be able to use eMMA-PrP module, 
IMX_HAVE_PLATFORM_MX2_CAMERA must be set.
And if I follow this logic, I have to put declaration of eMMA-PP with 
imx-fb and eMMA-PP can only be enabled if IMX_HAVE_PLATFORM_IMX_FB.
Of course, eMMA-PrP is almost always used with soc-camera and eMMA-PP 
with LCDC (imx-fb) but eMMA can be used to do HW accelarated colorspace 
conversion.
It is not a problem for me to keep eMMA-PrP and mx2-camera together. It 
was just to have a more independant eMMA driver.

For the Visstrim_M10 board, I don't think that it is needed to set 
IMX_HAVE_PLATFORM_MX2_EMMA because there is no reference to m2m-emmaprp 
and mx2-camera embeds handling of eMMA-PrP without using eMMA-PrP driver.
It seems that eMMA-PrP embeded in mx2camera handles more case than 
stand-alone eMMA-PrP driver. Maybe eMMA-PrP driver needs some review to 
handle all In/Out image formats ?
Please, let me know your point of view ?
Thank you.

On 09/05/2012 08:49 AM, javier Martin wrote:
> Hi Gaëtan,
> is there any real technical reason to do this or is the patch only for
> cosmetic purposes?
>
> The following patch, which is meant to go through the linux-media
> tree, adds support for mx2_emmaprp in the Visstrim_M10 boards:
> https://patchwork.kernel.org/patch/1347921/
>
> Could you please add the flag IMX_HAVE_PLATFORM_MX2_EMMA for the
> Visstrim_M10 board in this patch?
>
> On 4 September 2012 14:56, Gaëtan Carlier <gcembed@gmail.com> wrote:
>> IMX_HAVE_PLATFORM_MX2_EMMA define has been added.
>>
>> Signed-off-by: Gaëtan Carlier <gcembed@gmail.com>
>> ---
>>   arch/arm/mach-imx/devices-imx27.h               |    4 ++-
>>   arch/arm/plat-mxc/devices/Kconfig               |    3 ++
>>   arch/arm/plat-mxc/devices/Makefile              |    1 +
>>   arch/arm/plat-mxc/devices/platform-mx2-camera.c |   17 ---------
>>   arch/arm/plat-mxc/devices/platform-mx2-emma.c   |   41 +++++++++++++++++++++++
>>   arch/arm/plat-mxc/include/mach/devices-common.h |    9 ++++-
>>   6 files changed, 56 insertions(+), 19 deletions(-)
>>   create mode 100644 arch/arm/plat-mxc/devices/platform-mx2-emma.c
>>
>> diff --git a/arch/arm/mach-imx/devices-imx27.h b/arch/arm/mach-imx/devices-imx27.h
>> index 0482293..d8eb4a0 100644
>> --- a/arch/arm/mach-imx/devices-imx27.h
>> +++ b/arch/arm/mach-imx/devices-imx27.h
>> @@ -54,8 +54,10 @@ extern const struct imx_imx_uart_1irq_data imx27_imx_uart_data[];
>>   extern const struct imx_mx2_camera_data imx27_mx2_camera_data;
>>   #define imx27_add_mx2_camera(pdata)    \
>>          imx_add_mx2_camera(&imx27_mx2_camera_data, pdata)
>> +
>> +extern const struct imx_mx2_emma_data imx27_mx2_emmaprp_data;
>>   #define imx27_add_mx2_emmaprp()        \
>> -       imx_add_mx2_emmaprp(&imx27_mx2_camera_data)
>> +       imx_add_mx2_emmaprp(&imx27_mx2_emmaprp_data)
>>
>>   extern const struct imx_mxc_ehci_data imx27_mxc_ehci_otg_data;
>>   #define imx27_add_mxc_ehci_otg(pdata)  \
>
> This chunk doesn't seem ok. What kernel branch are you development against?
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=arch/arm/mach-imx/devices-imx27.h;h=436c5720fe6a40255a2c3bc5ab05378c23855e02;hb=HEAD#l50
>
>> diff --git a/arch/arm/plat-mxc/devices/Kconfig b/arch/arm/plat-mxc/devices/Kconfig
>> index 6b46cee..96feef7 100644
>> --- a/arch/arm/plat-mxc/devices/Kconfig
>> +++ b/arch/arm/plat-mxc/devices/Kconfig
>> @@ -56,6 +56,9 @@ config IMX_HAVE_PLATFORM_MX1_CAMERA
>>   config IMX_HAVE_PLATFORM_MX2_CAMERA
>>          bool
>>
>> +config IMX_HAVE_PLATFORM_MX2_EMMA
>> +       bool
>> +
>>   config IMX_HAVE_PLATFORM_MXC_EHCI
>>          bool
>>
>> diff --git a/arch/arm/plat-mxc/devices/Makefile b/arch/arm/plat-mxc/devices/Makefile
>> index 76f3195..7292c1f 100644
>> --- a/arch/arm/plat-mxc/devices/Makefile
>> +++ b/arch/arm/plat-mxc/devices/Makefile
>> @@ -28,3 +28,4 @@ obj-$(CONFIG_IMX_HAVE_PLATFORM_MXC_W1) += platform-mxc_w1.o
>>   obj-$(CONFIG_IMX_HAVE_PLATFORM_SDHCI_ESDHC_IMX) += platform-sdhci-esdhc-imx.o
>>   obj-$(CONFIG_IMX_HAVE_PLATFORM_SPI_IMX) +=  platform-spi_imx.o
>>   obj-$(CONFIG_IMX_HAVE_PLATFORM_AHCI) +=  platform-ahci-imx.o
>> +obj-$(CONFIG_IMX_HAVE_PLATFORM_MX2_EMMA) += platform-mx2-emma.o
>> diff --git a/arch/arm/plat-mxc/devices/platform-mx2-camera.c b/arch/arm/plat-mxc/devices/platform-mx2-camera.c
>> index 11eace9..11c688f 100644
>> --- a/arch/arm/plat-mxc/devices/platform-mx2-camera.c
>> +++ b/arch/arm/plat-mxc/devices/platform-mx2-camera.c
>> @@ -63,20 +63,3 @@ struct platform_device *__init imx_add_mx2_camera(
>>                          pdata, sizeof(*pdata), DMA_BIT_MASK(32));
>>   }
>>
>> -struct platform_device *__init imx_add_mx2_emmaprp(
>> -               const struct imx_mx2_camera_data *data)
>> -{
>> -       struct resource res[] = {
>> -               {
>> -                       .start = data->iobaseemmaprp,
>> -                       .end = data->iobaseemmaprp + data->iosizeemmaprp - 1,
>> -                       .flags = IORESOURCE_MEM,
>> -               }, {
>> -                       .start = data->irqemmaprp,
>> -                       .end = data->irqemmaprp,
>> -                       .flags = IORESOURCE_IRQ,
>> -               },
>> -       };
>> -       return imx_add_platform_device_dmamask("m2m-emmaprp", 0,
>> -                       res, 2, NULL, 0, DMA_BIT_MASK(32));
>> -}
>> diff --git a/arch/arm/plat-mxc/devices/platform-mx2-emma.c b/arch/arm/plat-mxc/devices/platform-mx2-emma.c
>> new file mode 100644
>> index 0000000..a51749a
>> --- /dev/null
>> +++ b/arch/arm/plat-mxc/devices/platform-mx2-emma.c
>> @@ -0,0 +1,41 @@
>> +/*
>> + * Copyright (C) 2010 Pengutronix
>> + * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
>> + *
>> + * 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.
>> + */
>> +#include <mach/hardware.h>
>> +#include <mach/devices-common.h>
>> +
>> +#define imx_mx2_emmaprp_data_entry_single(soc)                         \
>> +       {                                                               \
>> +               .iobase = soc ## _EMMAPRP_BASE_ADDR,                    \
>> +               .iosize = SZ_32,                                        \
>> +               .irq = soc ## _INT_EMMAPRP,                             \
>> +       }
>> +
>> +#ifdef CONFIG_SOC_IMX27
>> +const struct imx_mx2_emma_data imx27_mx2_emmaprp_data __initconst =
>> +       imx_mx2_emmaprp_data_entry_single(MX27);
>> +#endif /* ifdef CONFIG_SOC_IMX27 */
>> +
>> +struct platform_device *__init imx_add_mx2_emmaprp(
>> +               const struct imx_mx2_emma_data *data)
>> +{
>> +       struct resource res[] = {
>> +               {
>> +                       .start = data->iobase,
>> +                       .end = data->iobase + data->iosize - 1,
>> +                       .flags = IORESOURCE_MEM,
>> +               }, {
>> +                       .start = data->irq,
>> +                       .end = data->irq,
>> +                       .flags = IORESOURCE_IRQ,
>> +               },
>> +       };
>> +       return imx_add_platform_device_dmamask("m2m-emmaprp", 0,
>> +                       res, 2, NULL, 0, DMA_BIT_MASK(32));
>> +}
>> +
>> diff --git a/arch/arm/plat-mxc/include/mach/devices-common.h b/arch/arm/plat-mxc/include/mach/devices-common.h
>> index 762780c..2117072 100644
>> --- a/arch/arm/plat-mxc/include/mach/devices-common.h
>> +++ b/arch/arm/plat-mxc/include/mach/devices-common.h
>> @@ -229,8 +229,15 @@ struct imx_mx2_camera_data {
>>   struct platform_device *__init imx_add_mx2_camera(
>>                  const struct imx_mx2_camera_data *data,
>>                  const struct mx2_camera_platform_data *pdata);
>> +
>> +
>> +struct imx_mx2_emma_data {
>> +       resource_size_t iobase;
>> +       resource_size_t iosize;
>> +       resource_size_t irq;
>> +};
>>   struct platform_device *__init imx_add_mx2_emmaprp(
>> -               const struct imx_mx2_camera_data *data);
>> +               const struct imx_mx2_emma_data *data);
>>
>>   #include <mach/mxc_ehci.h>
>>   struct imx_mxc_ehci_data {
>> --
>> 1.7.7.4
>>
>
> Regards.
>
Regards,
Gaëtan.
Javier Martin - Sept. 5, 2012, 8:22 a.m.
On 5 September 2012 09:37, Gaëtan Carlier <gcembed@gmail.com> wrote:
> Hi Javier,
> This is because I will send a patch to add support of eMMA-PP. eMMA-PrP is
> not only used for soc-camera. It can also be used as stand-alone driver and
> now to be able to use eMMA-PrP module, IMX_HAVE_PLATFORM_MX2_CAMERA must be
> set.

Do you mean the following stand-alone driver I submitted some time
ago? Are you working on some improvements to it?
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=drivers/media/video/mx2_emmaprp.c;h=5f8a6f5b98f91c3af4e1bdbd06654e7b496d8d65;hb=HEAD

This driver can be used without applying your patch. Please take a
look at the following patch which is pending to get merged in
linux-media tree:
https://patchwork.kernel.org/patch/1347921/


> And if I follow this logic, I have to put declaration of eMMA-PP with imx-fb
> and eMMA-PP can only be enabled if IMX_HAVE_PLATFORM_IMX_FB.
> Of course, eMMA-PrP is almost always used with soc-camera and eMMA-PP with
> LCDC (imx-fb) but eMMA can be used to do HW accelarated colorspace
> conversion.

Agree, there is already one driver supporting this feature.

> It is not a problem for me to keep eMMA-PrP and mx2-camera together. It was
> just to have a more independant eMMA driver.

I won't oppose to it, for me it is just aesthetic. However, you must
do it properly without breaking existing boards such as Visstrim_M10.

> For the Visstrim_M10 board, I don't think that it is needed to set
> IMX_HAVE_PLATFORM_MX2_EMMA because there is no reference to m2m-emmaprp and
> mx2-camera embeds handling of eMMA-PrP without using eMMA-PrP driver.

The following patch was sent to the list in Agust the 20th and will be
merged in the linux-media tree. This patch does reference m2m-emmaprp
in Visstrim_M10
https://patchwork.kernel.org/patch/1347921/

So, please, since you have to fix the wrong chunk and have to send a
v2 anyways I strongly encourage you to add the flag
IMX_HAVE_PLATFORM_MX2_EMMA to Visstrim_M10. This way nothing will be
broken no matter your patch gets merged after or before mine.

> It seems that eMMA-PrP embeded in mx2camera handles more case than
> stand-alone eMMA-PrP driver. Maybe eMMA-PrP driver needs some review to
> handle all In/Out image formats ?

eMMa-PrP is currently used in two drivers:

1. http://git.linuxtv.org/media_tree.git/blob/refs/heads/staging/for_v3.7:/drivers/media/platform/soc_camera/mx2_camera.c
Where it is used as a substitute to a DMA that moves data between the
CSI and RAM apart from providing more features like format conversion,
etc... This is a soc_camera video capture driver.

2. http://git.linuxtv.org/media_tree.git/blob/refs/heads/staging/for_v3.7:/drivers/media/platform/mx2_emmaprp.c
This is a stand-alone mem2mem v4l2 driver that can get YUYV 422 in the
input and transform it to YUV 420. Of course, the driver can be
extended to support more kinds of conversions.

Regards.
Gaëtan Carlier - Sept. 5, 2012, 8:47 a.m.
On 09/05/2012 10:22 AM, javier Martin wrote:
> On 5 September 2012 09:37, Gaëtan Carlier <gcembed@gmail.com> wrote:
>> Hi Javier,
>> This is because I will send a patch to add support of eMMA-PP. eMMA-PrP is
>> not only used for soc-camera. It can also be used as stand-alone driver and
>> now to be able to use eMMA-PrP module, IMX_HAVE_PLATFORM_MX2_CAMERA must be
>> set.
>
> Do you mean the following stand-alone driver I submitted some time
> ago? Are you working on some improvements to it?
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=drivers/media/video/mx2_emmaprp.c;h=5f8a6f5b98f91c3af4e1bdbd06654e7b496d8d65;hb=HEAD
yes
>
> This driver can be used without applying your patch. Please take a
> look at the following patch which is pending to get merged in
> linux-media tree:
> https://patchwork.kernel.org/patch/1347921/
>
>
>> And if I follow this logic, I have to put declaration of eMMA-PP with imx-fb
>> and eMMA-PP can only be enabled if IMX_HAVE_PLATFORM_IMX_FB.
>> Of course, eMMA-PrP is almost always used with soc-camera and eMMA-PP with
>> LCDC (imx-fb) but eMMA can be used to do HW accelarated colorspace
>> conversion.
>
> Agree, there is already one driver supporting this feature.
>
>> It is not a problem for me to keep eMMA-PrP and mx2-camera together. It was
>> just to have a more independant eMMA driver.
>
> I won't oppose to it, for me it is just aesthetic. However, you must
> do it properly without breaking existing boards such as Visstrim_M10.
Ok, I missed your patch in mailing-list and I work with linux-next 
(20120824) so I didn't know that my patch would break yours. Sorry.
>
>> For the Visstrim_M10 board, I don't think that it is needed to set
>> IMX_HAVE_PLATFORM_MX2_EMMA because there is no reference to m2m-emmaprp and
>> mx2-camera embeds handling of eMMA-PrP without using eMMA-PrP driver.
>
> The following patch was sent to the list in Agust the 20th and will be
> merged in the linux-media tree. This patch does reference m2m-emmaprp
> in Visstrim_M10
> https://patchwork.kernel.org/patch/1347921/
>
> So, please, since you have to fix the wrong chunk and have to send a
> v2 anyways I strongly encourage you to add the flag
> IMX_HAVE_PLATFORM_MX2_EMMA to Visstrim_M10. This way nothing will be
> broken no matter your patch gets merged after or before mine.
What do you mean by "wrong chunk" ?
>
>> It seems that eMMA-PrP embeded in mx2camera handles more case than
>> stand-alone eMMA-PrP driver. Maybe eMMA-PrP driver needs some review to
>> handle all In/Out image formats ?
>
> eMMa-PrP is currently used in two drivers:
>
> 1. http://git.linuxtv.org/media_tree.git/blob/refs/heads/staging/for_v3.7:/drivers/media/platform/soc_camera/mx2_camera.c
> Where it is used as a substitute to a DMA that moves data between the
> CSI and RAM apart from providing more features like format conversion,
> etc... This is a soc_camera video capture driver.
>
> 2. http://git.linuxtv.org/media_tree.git/blob/refs/heads/staging/for_v3.7:/drivers/media/platform/mx2_emmaprp.c
> This is a stand-alone mem2mem v4l2 driver that can get YUYV 422 in the
> input and transform it to YUV 420. Of course, the driver can be
> extended to support more kinds of conversions.
>
> Regards.
>
Regards,
Gaëtan.

Patch

diff --git a/arch/arm/mach-imx/devices-imx27.h b/arch/arm/mach-imx/devices-imx27.h
index 0482293..d8eb4a0 100644
--- a/arch/arm/mach-imx/devices-imx27.h
+++ b/arch/arm/mach-imx/devices-imx27.h
@@ -54,8 +54,10 @@  extern const struct imx_imx_uart_1irq_data imx27_imx_uart_data[];
 extern const struct imx_mx2_camera_data imx27_mx2_camera_data;
 #define imx27_add_mx2_camera(pdata)	\
 	imx_add_mx2_camera(&imx27_mx2_camera_data, pdata)
+
+extern const struct imx_mx2_emma_data imx27_mx2_emmaprp_data;
 #define imx27_add_mx2_emmaprp()	\
-	imx_add_mx2_emmaprp(&imx27_mx2_camera_data)
+	imx_add_mx2_emmaprp(&imx27_mx2_emmaprp_data)
 
 extern const struct imx_mxc_ehci_data imx27_mxc_ehci_otg_data;
 #define imx27_add_mxc_ehci_otg(pdata)	\
diff --git a/arch/arm/plat-mxc/devices/Kconfig b/arch/arm/plat-mxc/devices/Kconfig
index 6b46cee..96feef7 100644
--- a/arch/arm/plat-mxc/devices/Kconfig
+++ b/arch/arm/plat-mxc/devices/Kconfig
@@ -56,6 +56,9 @@  config IMX_HAVE_PLATFORM_MX1_CAMERA
 config IMX_HAVE_PLATFORM_MX2_CAMERA
 	bool
 
+config IMX_HAVE_PLATFORM_MX2_EMMA
+	bool
+
 config IMX_HAVE_PLATFORM_MXC_EHCI
 	bool
 
diff --git a/arch/arm/plat-mxc/devices/Makefile b/arch/arm/plat-mxc/devices/Makefile
index 76f3195..7292c1f 100644
--- a/arch/arm/plat-mxc/devices/Makefile
+++ b/arch/arm/plat-mxc/devices/Makefile
@@ -28,3 +28,4 @@  obj-$(CONFIG_IMX_HAVE_PLATFORM_MXC_W1) += platform-mxc_w1.o
 obj-$(CONFIG_IMX_HAVE_PLATFORM_SDHCI_ESDHC_IMX) += platform-sdhci-esdhc-imx.o
 obj-$(CONFIG_IMX_HAVE_PLATFORM_SPI_IMX) +=  platform-spi_imx.o
 obj-$(CONFIG_IMX_HAVE_PLATFORM_AHCI) +=  platform-ahci-imx.o
+obj-$(CONFIG_IMX_HAVE_PLATFORM_MX2_EMMA) += platform-mx2-emma.o
diff --git a/arch/arm/plat-mxc/devices/platform-mx2-camera.c b/arch/arm/plat-mxc/devices/platform-mx2-camera.c
index 11eace9..11c688f 100644
--- a/arch/arm/plat-mxc/devices/platform-mx2-camera.c
+++ b/arch/arm/plat-mxc/devices/platform-mx2-camera.c
@@ -63,20 +63,3 @@  struct platform_device *__init imx_add_mx2_camera(
 			pdata, sizeof(*pdata), DMA_BIT_MASK(32));
 }
 
-struct platform_device *__init imx_add_mx2_emmaprp(
-		const struct imx_mx2_camera_data *data)
-{
-	struct resource res[] = {
-		{
-			.start = data->iobaseemmaprp,
-			.end = data->iobaseemmaprp + data->iosizeemmaprp - 1,
-			.flags = IORESOURCE_MEM,
-		}, {
-			.start = data->irqemmaprp,
-			.end = data->irqemmaprp,
-			.flags = IORESOURCE_IRQ,
-		},
-	};
-	return imx_add_platform_device_dmamask("m2m-emmaprp", 0,
-			res, 2, NULL, 0, DMA_BIT_MASK(32));
-}
diff --git a/arch/arm/plat-mxc/devices/platform-mx2-emma.c b/arch/arm/plat-mxc/devices/platform-mx2-emma.c
new file mode 100644
index 0000000..a51749a
--- /dev/null
+++ b/arch/arm/plat-mxc/devices/platform-mx2-emma.c
@@ -0,0 +1,41 @@ 
+/*
+ * Copyright (C) 2010 Pengutronix
+ * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
+ *
+ * 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.
+ */
+#include <mach/hardware.h>
+#include <mach/devices-common.h>
+
+#define imx_mx2_emmaprp_data_entry_single(soc)				\
+	{								\
+		.iobase = soc ## _EMMAPRP_BASE_ADDR,			\
+		.iosize = SZ_32,					\
+		.irq = soc ## _INT_EMMAPRP,				\
+	}
+
+#ifdef CONFIG_SOC_IMX27
+const struct imx_mx2_emma_data imx27_mx2_emmaprp_data __initconst =
+	imx_mx2_emmaprp_data_entry_single(MX27);
+#endif /* ifdef CONFIG_SOC_IMX27 */
+
+struct platform_device *__init imx_add_mx2_emmaprp(
+		const struct imx_mx2_emma_data *data)
+{
+	struct resource res[] = {
+		{
+			.start = data->iobase,
+			.end = data->iobase + data->iosize - 1,
+			.flags = IORESOURCE_MEM,
+		}, {
+			.start = data->irq,
+			.end = data->irq,
+			.flags = IORESOURCE_IRQ,
+		},
+	};
+	return imx_add_platform_device_dmamask("m2m-emmaprp", 0,
+			res, 2, NULL, 0, DMA_BIT_MASK(32));
+}
+
diff --git a/arch/arm/plat-mxc/include/mach/devices-common.h b/arch/arm/plat-mxc/include/mach/devices-common.h
index 762780c..2117072 100644
--- a/arch/arm/plat-mxc/include/mach/devices-common.h
+++ b/arch/arm/plat-mxc/include/mach/devices-common.h
@@ -229,8 +229,15 @@  struct imx_mx2_camera_data {
 struct platform_device *__init imx_add_mx2_camera(
 		const struct imx_mx2_camera_data *data,
 		const struct mx2_camera_platform_data *pdata);
+
+
+struct imx_mx2_emma_data {
+	resource_size_t iobase;
+	resource_size_t iosize;
+	resource_size_t irq;
+};
 struct platform_device *__init imx_add_mx2_emmaprp(
-		const struct imx_mx2_camera_data *data);
+		const struct imx_mx2_emma_data *data);
 
 #include <mach/mxc_ehci.h>
 struct imx_mxc_ehci_data {