Re: [PATCH v4 3/3] media: mtk-mdp: Fix mdp device tree

[Matthias Brugger <matthias.bgg@gmail.com>]

Hi Hans, hi Mauro,

On 23/05/17 05:24, Minghsiu Tsai wrote:
> From: Daniel Kurtz <djkurtz@chromium.org>
> 
> If the mdp_* nodes are under an mdp sub-node, their corresponding
> platform device does not automatically get its iommu assigned properly.
> 
> Fix this by moving the mdp component nodes up a level such that they are
> siblings of mdp and all other SoC subsystems.  This also simplifies the
> device tree.
> 
> Although it fixes iommu assignment issue, it also break compatibility
> with old device tree. So, the patch in driver is needed to iterate over
> sibling mdp device nodes, not child ones, to keep driver work properly.
> 
> Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
> Signed-off-by: Minghsiu Tsai <minghsiu.tsai@mediatek.com>
> Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
> 

Are you OK to take this patch, or do you have any further comments?

Regards,
Matthias

> ---
>   drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 12 ++++++++++--
>   1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> index 9e4eb7d..8134755 100644
> --- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> @@ -103,7 +103,7 @@ static int mtk_mdp_probe(struct platform_device *pdev)
>   {
>   	struct mtk_mdp_dev *mdp;
>   	struct device *dev = &pdev->dev;
> -	struct device_node *node;
> +	struct device_node *node, *parent;
>   	int i, ret = 0;
>   
>   	mdp = devm_kzalloc(dev, sizeof(*mdp), GFP_KERNEL);
> @@ -117,8 +117,16 @@ static int mtk_mdp_probe(struct platform_device *pdev)
>   	mutex_init(&mdp->lock);
>   	mutex_init(&mdp->vpulock);
>   
> +	/* Old dts had the components as child nodes */
> +	if (of_get_next_child(dev->of_node, NULL)) {
> +		parent = dev->of_node;
> +		dev_warn(dev, "device tree is out of date\n");
> +	} else {
> +		parent = dev->of_node->parent;
> +	}
> +
>   	/* Iterate over sibling MDP function blocks */
> -	for_each_child_of_node(dev->of_node, node) {
> +	for_each_child_of_node(parent, node) {
>   		const struct of_device_id *of_id;
>   		enum mtk_mdp_comp_type comp_type;
>   		int comp_id;
>