linux-kernel - Re: [PATCH v8 3/4] drm/atmel-hlcdc: iterate over all output endpoints

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Date:   Mon, 13 Aug 2018 15:59:49 +0200
From:   jacopo mondi <jacopo@...ndi.org>
To:     Peter Rosin <peda@...ntia.se>
Cc:     linux-kernel@...r.kernel.org,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        David Airlie <airlied@...ux.ie>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, Jyri Sarha <jsarha@...com>,
        Daniel Vetter <daniel@...ll.ch>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Sakari Ailus <sakari.ailus@....fi>
Subject: Re: [PATCH v8 3/4] drm/atmel-hlcdc: iterate over all output endpoints

Hi Peter,

On Fri, Aug 10, 2018 at 03:03:58PM +0200, Peter Rosin wrote:
> This enables more flexible devicetrees. You can e.g. have two output
> nodes where one is not enabled, without the ordering affecting things.
> 
> Prior to this patch the active node had to have endpoint id zero.
> 
> Signed-off-by: Peter Rosin <peda@...ntia.se>
> ---
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c | 32 ++++++++++++++++++------
>  1 file changed, 25 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
> index 8db51fb131db..16c1b2f54b42 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
> @@ -31,14 +31,16 @@ static const struct drm_encoder_funcs atmel_hlcdc_panel_encoder_funcs = {
>  	.destroy = drm_encoder_cleanup,
>  };
>  
> -static int atmel_hlcdc_attach_endpoint(struct drm_device *dev, int endpoint)
> +static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
> +				       struct of_endpoint *endpoint)
>  {
>  	struct drm_encoder *encoder;
>  	struct drm_panel *panel;
>  	struct drm_bridge *bridge;
>  	int ret;
>  
> -	ret = drm_of_find_panel_or_bridge(dev->dev->of_node, 0, endpoint,
> +	ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
> +					  endpoint->port, endpoint->id,

You are refusing endpoint->port != 0 in the caller, so that could be
0.

Apart from that small nit:
Reviewed-by: Jacopo Mondi <jacopo+renesas@...ndi.org>

Thanks
  j

>  					  &panel, &bridge);
>  	if (ret)
>  		return ret;
> @@ -77,13 +79,29 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev, int endpoint)
>  
>  int atmel_hlcdc_create_outputs(struct drm_device *dev)
>  {
> -	int endpoint, ret = 0;
> -
> -	for (endpoint = 0; !ret; endpoint++)
> -		ret = atmel_hlcdc_attach_endpoint(dev, endpoint);
> +	struct of_endpoint endpoint;
> +	struct device_node *node = NULL;
> +	int count = 0;
> +	int ret = 0;
> +
> +	for_each_endpoint_of_node(dev->dev->of_node, node) {
> +		of_graph_parse_endpoint(node, &endpoint);
> +
> +		if (endpoint.port)
> +			continue;
> +
> +		ret = atmel_hlcdc_attach_endpoint(dev, &endpoint);
> +		if (ret == -ENODEV)
> +			continue;
> +		if (ret) {
> +			of_node_put(node);
> +			break;
> +		}
> +		count++;
> +	}
>  
>  	/* At least one device was successfully attached.*/
> -	if (ret == -ENODEV && endpoint)
> +	if (ret == -ENODEV && count)
>  		return 0;
>  
>  	return ret;
> -- 
> 2.11.0
>