Re: [PATCH V3 1/2] drm/exynos: add platform_device_id table and driver data for exynos5 drm fimd

[Tomasz Figa <t.figa@samsung.com>]

Hi Leela,

See my comments inline.

On Thursday 16 of August 2012 12:08:08 Leela Krishna Amudala wrote:
> +enum fimd_version_type {
> +	VERSION_8, /* FIMD_VERSION8 */
> +};
> +
> +struct drm_fimd_driver_data {
> +	enum fimd_version_type fimd_ver;
> +};
> +
> +struct drm_fimd_driver_data exynos5_drm_fimd_driver_data = {
> +	.fimd_ver = VERSION_8,
> +};

I think that the approach with timing_base, as suggested by Joonyoung Shim, 
would be much cleaner.

> +static struct platform_device_id exynos_drm_fimd_driver_ids[] = {
> +	{
> +		.name		= "exynos4-fb",
> +	}, {
> +		.name		= "exynos5-drm-fimd",
> +		.driver_data	= (unsigned long)&exynos5_drm_fimd_driver_data,
> +	},
> +	{},
> +};
> +MODULE_DEVICE_TABLE(platform, exynos_drm_fimd_driver_ids);

If I see correctly, this will crash on a null pointer dereference on 
Exynos4 without DT, because of NULL driver_data.

P.S. I think you should CC linux-arm-kernel and linux-samsung-soc lists 
when submitting patches related to ARM and Samsung SoCs.

Best regards,
-- 
Tomasz Figa
Samsung Poland R&D Center