Date:   Mon, 6 Feb 2017 09:50:23 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Rob Herring <robh@...nel.org>
Cc:     David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Sean Paul <seanpaul@...omium.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Liviu Dudau <liviu.dudau@....com>,
        dri-devel@...ts.freedesktop.org,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Frank Rowand <frowand.list@...il.com>,
        Marek Vasut <marex@...x.de>,
        Kevin Hilman <khilman@...libre.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Xinliang Liu <z.liuxinliang@...ilicon.com>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Xinwei Kong <kong.kongxinwei@...ilicon.com>,
        Kukjin Kim <kgene@...nel.org>,
        Mali DP Maintainers <malidp@...s.arm.com>,
        devicetree@...r.kernel.org, Chen Feng <puck.chen@...ilicon.com>,
        Jyri Sarha <jsarha@...com>, Carlo Caione <carlo@...one.org>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Alison Wang <alison.wang@...escale.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        linux-kernel@...r.kernel.org,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Rongrong Zou <zourongrong@...il.com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>
Subject: Re: [PATCH 1/5] of: introduce of_graph_get_remote_node

On Fri, Feb 03, 2017 at 09:36:31PM -0600, Rob Herring wrote:
> The OF graph API leaves too much of the graph walking to clients when
> in many cases the driver doesn't care about accessing the port or
> endpoint nodes. The drivers typically just want the device connected via
> a particular graph connection. of_graph_get_remote_node provides this
> functionality.
> 
> Signed-off-by: Rob Herring <robh@...nel.org>

Just a quick procedural comment: drm-misc for 4.11 is closed already, but
if we can get this core patch into 4.11 still then that would avoid
cross-tree sync pains in 4.12 ...
-Daniel

> ---
>  drivers/of/base.c        | 28 ++++++++++++++++++++++++++++
>  include/linux/of_graph.h |  8 ++++++++
>  2 files changed, 36 insertions(+)
> 
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index d4bea3c797d6..ea18ab16b92c 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -2469,3 +2469,31 @@ struct device_node *of_graph_get_remote_port(const struct device_node *node)
>  	return of_get_next_parent(np);
>  }
>  EXPORT_SYMBOL(of_graph_get_remote_port);
> +
> +struct device_node *of_graph_get_remote_node(const struct device_node *node,
> +					     int port, int endpoint)
> +{
> +	struct device_node *endpoint_node, *remote;
> +
> +	endpoint_node = of_graph_get_endpoint_by_regs(node, port, endpoint);
> +	if (!endpoint_node) {
> +		pr_debug("no valid endpoint (%d, %d) for node %s\n",
> +			 port, endpoint, node->full_name);
> +		return NULL;
> +	}
> +
> +	remote = of_graph_get_remote_port_parent(endpoint_node);
> +	of_node_put(endpoint);
> +	if (!remote) {
> +		pr_debug("no valid remote node\n");
> +		return NULL;
> +	}
> +
> +	if (!of_device_is_available(remote)) {
> +		pr_debug("not available for remote node\n");
> +		return NULL;
> +	}
> +
> +	return remote;
> +}
> +EXPORT_SYMBOL(of_graph_get_remote_node);
> diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h
> index bb3a5a2cd570..7b71d3e09209 100644
> --- a/include/linux/of_graph.h
> +++ b/include/linux/of_graph.h
> @@ -51,6 +51,8 @@ struct device_node *of_graph_get_endpoint_by_regs(
>  struct device_node *of_graph_get_remote_port_parent(
>  					const struct device_node *node);
>  struct device_node *of_graph_get_remote_port(const struct device_node *node);
> +struct device_node *of_graph_get_remote_node(const struct device_node *node,
> +					     int port, int endpoint);
>  #else
>  
>  static inline int of_graph_parse_endpoint(const struct device_node *node,
> @@ -89,6 +91,12 @@ static inline struct device_node *of_graph_get_remote_port(
>  {
>  	return NULL;
>  }
> +static inline struct device_node *of_graph_get_remote_node(
> +					const struct device_node *node,
> +					int port, int endpoint)
> +{
> +	return NULL;
> +}
>  
>  #endif /* CONFIG_OF */
>  
> -- 
> 2.10.1
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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