Re: [PATCH 1/3] drm/exynos: add device tree support for rotator

[Tomasz Figa <tomasz.figa@gmail.com>]

On Monday 22 of July 2013 15:49:25 Chanho Park wrote:
> The exynos4 platform is only dt-based since 3.10, we should convert
> driver data and ids to dt-based parsing methods. The rotator driver has
> a limit table to get size limit. The minimum size of RGB888 format is 8
> x 8 and maximum size is 8K x 8K. The other format, YCbCr420 2-Plane has
> 32 x 32 min size and 32K x 32K max size. Each format should be multiple
> of 'align' value.
> 
> Signed-off-by: Chanho Park <chanho61.park@samsung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
> ---
>  drivers/gpu/drm/exynos/exynos_drm_rotator.c |  110
> +++++++++++++++++++-------- 1 file changed, 80 insertions(+), 30
> deletions(-)
> 
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_rotator.c
> b/drivers/gpu/drm/exynos/exynos_drm_rotator.c index 427640a..b353a10
> 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_rotator.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_rotator.c
> @@ -96,7 +96,7 @@ struct rot_context {
>  	struct resource	*regs_res;
>  	void __iomem	*regs;
>  	struct clk	*clock;
> -	struct rot_limit_table	*limit_tbl;
> +	struct rot_limit_table	limit_tbl;
>  	int	irq;
>  	int	cur_buf_id[EXYNOS_DRM_OPS_MAX];
>  	bool	suspended;
> @@ -167,7 +167,7 @@ static irqreturn_t rotator_irq_handler(int irq, void
> *arg) static void rotator_align_size(struct rot_context *rot, u32 fmt,
> u32 *hsize, u32 *vsize)
>  {
> -	struct rot_limit_table *limit_tbl = rot->limit_tbl;
> +	struct rot_limit_table *limit_tbl = &rot->limit_tbl;
>  	struct rot_limit *limit;
>  	u32 mask, val;
> 
> @@ -632,6 +632,72 @@ static int rotator_ippdrv_start(struct device *dev,
> enum drm_exynos_ipp_cmd cmd) return 0;
>  }
> 
> +static const struct of_device_id exynos_rotator_match[] = {
> +	{
> +		.compatible = "samsung,exynos4210-rotator",
> +	},
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, exynos_rotator_match);
> +
> +static int rotator_parse_dt_tbl(struct device_node *np, struct
> rot_limit *rlim) +{
> +	int ret;
> +
> +	ret = of_property_read_u32(np, "min_w", &rlim->min_w);
> +	if (ret)
> +		return ret;
> +
> +	ret = of_property_read_u32(np, "min_h", &rlim->min_h);
> +	if (ret)
> +		return ret;
> +
> +	ret = of_property_read_u32(np, "max_w", &rlim->max_w);
> +	if (ret)
> +		return ret;
> +
> +	ret = of_property_read_u32(np, "max_h", &rlim->max_h);
> +	if (ret)
> +		return ret;
> +
> +	ret = of_property_read_u32(np, "align", &rlim->align);
> +	if (ret)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static int rotator_parse_dt(struct device *dev, struct rot_context
> *rot) +{
> +	struct device_node *ycbcr_node, *rgb888_node;
> +	int ret;
> +
> +	ycbcr_node = of_get_child_by_name(dev->of_node, "ycbcr420_2p");
> +	if (!ycbcr_node) {
> +		dev_err(dev, "can't find ycbcr420_2p node\n");
> +		return -ENODEV;
> +	}
> +
> +	rgb888_node = of_get_child_by_name(dev->of_node, "rgb888");
> +	if (!rgb888_node) {
> +		dev_err(dev, "can't find rgb888 node\n");
> +		return -ENODEV;
> +	}
> +
> +	ret = rotator_parse_dt_tbl(ycbcr_node, &rot-
>limit_tbl.ycbcr420_2p);
> +	if (ret) {
> +		dev_err(dev, "failed to parse ycbcr420 data\n");
> +		return ret;
> +	}
> +	ret = rotator_parse_dt_tbl(rgb888_node, &rot->limit_tbl.rgb888);
> +	if (ret) {
> +		dev_err(dev, "failed to parse rgb888 data\n");
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
>  static int rotator_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> @@ -639,14 +705,23 @@ static int rotator_probe(struct platform_device
> *pdev) struct exynos_drm_ippdrv *ippdrv;
>  	int ret;
> 
> +	if (!dev->of_node) {
> +		dev_err(dev, "Cannot find device tree node\n");
> +		return -ENODEV;
> +	}
> +
>  	rot = devm_kzalloc(dev, sizeof(*rot), GFP_KERNEL);
>  	if (!rot) {
>  		dev_err(dev, "failed to allocate rot\n");
>  		return -ENOMEM;
>  	}
> 
> -	rot->limit_tbl = (struct rot_limit_table *)
> -				platform_get_device_id(pdev)->driver_data;
> +	ret = rotator_parse_dt(dev, rot);
> +	if (ret) {
> +		dev_err(dev, "failed parse dt info\n");
> +		devm_kfree(dev, rot);
> +		return ret;
> +	}
> 
>  	rot->regs_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	rot->regs = devm_ioremap_resource(dev, rot->regs_res);
> @@ -718,31 +793,6 @@ static int rotator_remove(struct platform_device
> *pdev) return 0;
>  }
> 
> -static struct rot_limit_table rot_limit_tbl = {
> -	.ycbcr420_2p = {
> -		.min_w = 32,
> -		.min_h = 32,
> -		.max_w = SZ_32K,
> -		.max_h = SZ_32K,
> -		.align = 3,
> -	},
> -	.rgb888 = {
> -		.min_w = 8,
> -		.min_h = 8,
> -		.max_w = SZ_8K,
> -		.max_h = SZ_8K,
> -		.align = 2,
> -	},
> -};
> -
> -static struct platform_device_id rotator_driver_ids[] = {
> -	{
> -		.name		= "exynos-rot",
> -		.driver_data	= (unsigned long)&rot_limit_tbl,
> -	},
> -	{},
> -};
> -

I would keep these driver data here and just point to them from match_data 
of OF match table, as suggested in other replies.

Best regards,
Tomasz