linux-kernel - Re: [PATCH] ARM: dts: Add ddc i2c reference to veyron

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Date:	Fri, 04 Sep 2015 00:01:35 +0200
From:	Heiko Stuebner <heiko@...ech.de>
To:	Doug Anderson <dianders@...omium.org>
Cc:	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	Alexandru Stan <amstan@...omium.org>,
	Brian Norris <briannorris@...omium.org>,
	Yakir Yang <ykk@...k-chips.com>,
	姚智情 <mark.yao@...k-chips.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: dts: Add ddc i2c reference to veyron

Am Donnerstag, 3. September 2015, 14:00:26 schrieb Doug Anderson:
> Hi,
> 
> On Wed, Sep 2, 2015 at 2:25 PM, Douglas Anderson <dianders@...omium.org> 
wrote:
> > The ddc-i2c-bus property was missing from the veyron dtsi file since
> > downstream the ddc-i2c-bus was still being specified in rk3288.dtsi and
> > nobody noticed when the veyron dtsi was sent upstream.  Add it.
> > 
> > Signed-off-by: Douglas Anderson <dianders@...omium.org>
> > ---
> > Note: I noticed that this was wrong but I don't currently have
> > graphics up and running on upstream on veyron.  Posting this anyway
> > since it's pretty clear that it's needed.  If someone else wants to
> > try it out that'd be nice, otherwise I'll put it on my list to figure
> > out how to get myself setup for graphics upstream.  ;)
> 
> OK, I've used Heiko's "somewhat stable" branch to test this against
> something very close to mainline.

for people playing along, that is [0]. Essentially bleeding edge mainline + 
some backports from other maintainer trees +the last bits in the works, like 
the eDP support.

> Without my patch I can't read the HDMI EDID.  With my patch I can.  :)

The change follows the current dt-binding in the kernel for the (rockchip-
variant of the) dw_hdmi, so if nobody keeps protesting loudly, I'd like to 
pick this up to get the hdmi on Veyron devices going.

And I guess we'll remove this again (also in the other boards), once the 
dw_hdmi-internal i2c stuff is included - so this should be temporary as Rob 
hoped.


Heiko


[0] https://github.com/mmind/linux-rockchip/tree/v4.2-rockchip-somewhat-stable

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