Re: [PATCH v2 1/2] drm/exynos: dp: add of_graph dt binding support for panel

[Inki Dae <inki.dae@samsung.com>]

It seems that below patch should be modifed for only one of two outbound nodes - panel
and bridge - to be bound because in case of using bridge device, the bridge driver will
bind the panel. I will fix and post it again.

Thanks,
Inki Dae

2015년 12월 02일 20:57에 Inki Dae 이(가) 쓴 글:
> This patch adds of_graph dt binding support for panel device
> and also keeps the backward compatibility.
> 
> i.e.,
> The dts file for Exynos5800 based peach pi board
> has a panel property so we need to keep the backward compatibility.
> 
> Changelog v2:
> - return -EINVAL if getting a port node failed.
> 
> Signed-off-by: Inki Dae <inki.dae@samsung.com>
> ---
>  drivers/gpu/drm/exynos/exynos_dp_core.c | 21 +++++++++++++++++++--
>  1 file changed, 19 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.c b/drivers/gpu/drm/exynos/exynos_dp_core.c
> index 94f02a0..0b53045 100644
> --- a/drivers/gpu/drm/exynos/exynos_dp_core.c
> +++ b/drivers/gpu/drm/exynos/exynos_dp_core.c
> @@ -1392,7 +1392,7 @@ static const struct component_ops exynos_dp_ops = {
>  static int exynos_dp_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> -	struct device_node *panel_node, *bridge_node, *endpoint;
> +	struct device_node *panel_node = NULL, *bridge_node, *endpoint = NULL;
>  	struct exynos_dp_device *dp;
>  	int ret;
>  
> @@ -1403,15 +1403,32 @@ static int exynos_dp_probe(struct platform_device *pdev)
>  
>  	platform_set_drvdata(pdev, dp);
>  
> +	/* This is for the backward compatibility. */
>  	panel_node = of_parse_phandle(dev->of_node, "panel", 0);
>  	if (panel_node) {
>  		dp->panel = of_drm_find_panel(panel_node);
>  		of_node_put(panel_node);
>  		if (!dp->panel)
>  			return -EPROBE_DEFER;
> +	} else {
> +		endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
> +		if (endpoint) {
> +			panel_node = of_graph_get_remote_port_parent(endpoint);
> +			if (panel_node) {
> +				dp->panel = of_drm_find_panel(panel_node);
> +				of_node_put(panel_node);
> +				if (!dp->panel)
> +					return -EPROBE_DEFER;
> +			} else {
> +				DRM_ERROR("no port node for panel device.\n");
> +				return -EINVAL;
> +			}
> +		}
>  	}
>  
> -	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
> +	panel_node = !endpoint ? NULL : panel_node;
> +
> +	endpoint = of_graph_get_next_endpoint(dev->of_node, panel_node);
>  	if (endpoint) {
>  		bridge_node = of_graph_get_remote_port_parent(endpoint);
>  		if (bridge_node) {
>