linux-kernel - Re: [PATCH v2 0/2] Improve drm_of_component

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Date:	Wed, 23 Dec 2015 10:39:06 +0100
From:	Jean-Francois Moine <moinejf@...e.fr>
To:	Liviu Dudau <Liviu.Dudau@....com>
Cc:	Russell King <rmk+kernel@....linux.org.uk>,
	Mark Yao <mark.yao@...k-chips.com>,
	Heiko Stübner <heiko@...ech.de>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	David Airlie <airlied@...ux.ie>, Eric Anholt <eric@...olt.net>,
	linux-rockchip <linux-rockchip@...ts.infradead.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/2] Improve drm_of_component_probe() and move
 rockchip to use it

On Tue, 22 Dec 2015 17:38:00 +0000
Liviu Dudau <Liviu.Dudau@....com> wrote:

> On Fri, Nov 20, 2015 at 02:22:03PM +0000, Liviu Dudau wrote:
> > Hello,
> > 
> > This is v2 of the patchset trying to make drm_of_component_probe() cope with finding
> > both local crtc ports and remote encoder ones. Heiko Stübner was nice enough to test
> > an earlier version that was patched following Russell's suggestions on rk3288, but
> > I haven't seen any reports from iMX or Armada users.
> > 
> > Changelog:
> >  v2: Updated the drm_of_component_probe() comment to explain why the reference count
> >      is not dropped. Fixed the compare_port() function for rockchip as described by
> >      Russell.
> >  v1: Original submission. http://lists.freedesktop.org/archives/dri-devel/2015-November/094546.html
> 
> Gentle ping, this has now been tested by Rockchip people and fixes the earlier version
> that had to be reverted in mainline. Can it be included in the -next somewhere?

Hi Liviu,

Sorry for being a bit late.

I wanted to use drm_of_component_probe() for a new DRM driver, but I
could not find any way to do it: you add the "ports" nodes as
components while, usually, the components are the device nodes
themselves.

With this simple patch:

diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
index 493c05c..dbd2921 100644
--- a/drivers/gpu/drm/drm_of.c
+++ b/drivers/gpu/drm/drm_of.c
@@ -101,7 +101,7 @@ int drm_of_component_probe(struct device *dev,
 			continue;
 		}
 
-		component_match_add(dev, &match, compare_of, port);
+		component_match_add(dev, &match, compare_of, port->parent);
 		of_node_put(port);
 	}
 
everything is easy, my DT being like:

	de_controller {
		...
		ports = <&lcd0_p>;
	};

	lcd_controller {
		...
		lcd0_p: port {
			lcd0_ep: endpoint {
				remote-endpoint = <&hdmi_ep>;
			};
		};
	};

What was the reason to keep the "ports" node instead of the device?

-- 
Ken ar c'hentañ	|	      ** Breizh ha Linux atav! **
Jef		|		http://moinejf.free.fr/
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