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

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Date:	Thu, 3 Sep 2015 10:46:20 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Douglas Anderson <dianders@...omium.org>,
	Heiko Stuebner <heiko@...ech.de>,
	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>,
	"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 3, 2015 at 10:18 AM, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> 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.

See his earlier reply and other patch[1] which states once the dw_hdmi
built-in I2C controller support is added in mainline, then this
property is not needed. For now, the SOC's general purpose I2C
controller is used.

Rob

[1] https://lkml.org/lkml/2015/9/2/571
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