[PATCH v2 1/3] mx2_camera: Add soc_camera support for i.MX25/i.MX27

[s.hauer@pengutronix.de (Sascha Hauer)]

On Mon, May 24, 2010 at 04:20:39PM +0300, Baruch Siach wrote:
> This is the soc_camera support developed by Sascha Hauer for the i.MX27.  Alan
> Carvalho de Assis modified the original driver to get it working on more recent
> kernels. I modified it further to add support for i.MX25. This driver has been
> tested on i.MX25 and i.MX27 based platforms.
> 
> Signed-off-by: Baruch Siach <baruch@tkos.co.il>
> ---
>  arch/arm/plat-mxc/include/mach/memory.h  |    4 +-
>  arch/arm/plat-mxc/include/mach/mx2_cam.h |   46 +
>  drivers/media/video/Kconfig              |   13 +
>  drivers/media/video/Makefile             |    1 +
>  drivers/media/video/mx2_camera.c         | 1471 ++++++++++++++++++++++++++++++
>  5 files changed, 1533 insertions(+), 2 deletions(-)
>  create mode 100644 arch/arm/plat-mxc/include/mach/mx2_cam.h
>  create mode 100644 drivers/media/video/mx2_camera.c
> 

[snip]

> +
> +static int mclk_get_divisor(struct mx2_camera_dev *pcdev)
> +{
> +	dev_info(pcdev->dev, "%s not implemented. Running at max speed\n",
> +			__func__);
> +
> +#if 0
> +	unsigned int mclk = pcdev->pdata->clk_csi;
> +	unsigned int pclk = clk_get_rate(pcdev->clk_csi);
> +	int i;
> +
> +	dev_dbg(pcdev->dev, "%s: %ld %ld\n", __func__, mclk, pclk);
> +
> +	for (i = 0; i < 0xf; i++)
> +		if ((i + 1) * 2 * mclk <= pclk)
> +			break;
> +	return i;
> +#endif
> +	return 0;
> +}

This function, if implemented properly, can be used to add an additional
divider for the sensors master clock. On i.MX27 we can adjust the master
clock using the clk_set_rate below which is sufficient, so you can
remove this function completely.

Sascha

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