linux-kernel - Re: [PATCH 2/5] drm: of: introduce drm_of_find_panel_or

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Date:   Fri, 10 Feb 2017 11:42:55 -0800
From:   Frank Rowand <frowand.list@...il.com>
To:     Rob Herring <robh@...nel.org>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Sean Paul <seanpaul@...omium.org>
Cc:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Archit Taneja <architt@...eaurora.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Inki Dae <inki.dae@...sung.com>,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Stefan Agner <stefan@...er.ch>,
        Alison Wang <alison.wang@...escale.com>,
        Xinliang Liu <z.liuxinliang@...ilicon.com>,
        Rongrong Zou <zourongrong@...il.com>,
        Xinwei Kong <kong.kongxinwei@...ilicon.com>,
        Chen Feng <puck.chen@...ilicon.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        CK Hu <ck.hu@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Marek Vasut <marex@...x.de>,
        Mark Yao <mark.yao@...k-chips.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Liviu Dudau <liviu.dudau@....com>,
        Mali DP Maintainers <malidp@...s.arm.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Carlo Caione <carlo@...one.org>,
        Kevin Hilman <khilman@...libre.com>,
        Rob Clark <robdclark@...il.com>, Jyri Sarha <jsarha@...com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Eric Anholt <eric@...olt.net>,
        Russell King <rmk+kernel@...linux.org.uk>
Subject: Re: [PATCH 2/5] drm: of: introduce drm_of_find_panel_or_bridge

On 02/03/17 19:36, Rob Herring wrote:
> Many drivers have a common pattern of searching the OF graph for either an
> attached panel or bridge and then finding the DRM struct for the panel
> or bridge. Also, most drivers need to handle deferred probing when the
> DRM device is not yet instantiated. Create a common function,
> drm_of_find_panel_or_bridge, to find the connected node and the
> associated DRM panel or bridge device.
> 
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
>  drivers/gpu/drm/drm_of.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++
>  include/drm/drm_of.h     | 13 +++++++++++++
>  2 files changed, 63 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
> index 47848ed8ca48..b29ce2f52113 100644
> --- a/drivers/gpu/drm/drm_of.c
> +++ b/drivers/gpu/drm/drm_of.c
> @@ -3,7 +3,9 @@
>  #include <linux/list.h>
>  #include <linux/of_graph.h>
>  #include <drm/drmP.h>
> +#include <drm/drm_bridge.h>
>  #include <drm/drm_crtc.h>
> +#include <drm/drm_panel.h>
>  #include <drm/drm_of.h>
>  
>  static void drm_release_of(struct device *dev, void *data)
> @@ -207,3 +209,51 @@ int drm_of_encoder_active_endpoint(struct device_node *node,
>  	return -EINVAL;
>  }
>  EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint);
> +
> +/*
> + * drm_of_find_panel_or_bridge - return connected panel or bridge device
> + * @np: device tree node containing encoder input ports

      @port: ....
      @endpoint: ....


> + * @panel: pointer to hold returned drm_panel
> + * @bridge: pointer to hold returned drm_bridge
> + *
> + * Given a DT node's port and endpoint number, find the connected node and
> + * return either the associated struct drm_panel or drm_bridge device.
> + *
> + * Returns zero if successful, or one of the standard error codes if it fails.
> + */
> +int drm_of_find_panel_or_bridge(const struct device_node *np,
> +				int port, int endpoint,
> +				struct drm_panel **panel,
> +				struct drm_bridge **bridge)
> +{

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