linux-kernel - Re: [PATCH v5 6/7] of: Implement simplified graph binding for single port devices

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Message-ID: <53159791.5080205@ti.com>
Date:	Tue, 4 Mar 2014 11:06:25 +0200
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	Philipp Zabel <p.zabel@...gutronix.de>
CC:	Grant Likely <grant.likely@...aro.org>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	<linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>,
	<devicetree@...r.kernel.org>
Subject: Re: [PATCH v5 6/7] of: Implement simplified graph binding for single
 port devices

On 27/02/14 19:35, Philipp Zabel wrote:
> For simple devices with only one port, it can be made implicit.
> The endpoint node can be a direct child of the device node.

<snip>

> @@ -2105,9 +2112,11 @@ struct device_node *of_graph_get_remote_port_parent(
>  	/* Get remote endpoint node. */
>  	np = of_parse_phandle(node, "remote-endpoint", 0);
>  
> -	/* Walk 3 levels up only if there is 'ports' node. */
> +	/* Walk 3 levels up only if there is 'ports' node */
>  	for (depth = 3; depth && np; depth--) {
>  		np = of_get_next_parent(np);
> +		if (depth == 3 && of_node_cmp(np->name, "port"))
> +			break;
>  		if (depth == 2 && of_node_cmp(np->name, "ports"))
>  			break;
>  	}

This function becomes a bit funny. Would it be clearer just to do
something like:

	np = of_parse_phandle(node, "remote-endpoint", 0);

	np = of_get_next_parent(np);
	if (of_node_cmp(np->name, "port") != 0)
		return np;

	np = of_get_next_parent(np);
	if (of_node_cmp(np->name, "ports") != 0)
		return np;

	np = of_get_next_parent(np);
	return np;

 Tomi



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