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

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Date:	Thu, 3 Sep 2015 16:18:54 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Rob Herring <robherring2@...il.com>
Cc:	Douglas Anderson <dianders@...omium.org>,
	Heiko Stuebner <heiko@...ech.de>,
	linux-rockchip@...ts.infradead.org,
	Alexandru Stan <amstan@...omium.org>, 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>,
	"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

On Thu, Sep 03, 2015 at 09:46:38AM -0500, Rob Herring wrote:
> Yes, that is fairly common (ADV75xx is same), and we would not
> describe an I2C bus in DT in that case. Same with HPD directly handled
> vs. a GPIO line. That is no different than what Doug has said:
> ddc-i2c-bus is present if using the SOC's I2C host and absent if using
> the HDMI block's DDC functionality. I'm only questioning the location
> of the property.

No, I don't think that's what Doug wants.  Doug wants the bridge's
internal I2C host to be exposed, so he can number it through a DT
alias.

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