linux-kernel - Re: [PATCH] ARM: dts: Add the hdmi-ddc pinctrl settings for rk3288

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Date:	Sun, 13 Sep 2015 13:32:34 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Douglas Anderson <dianders@...omium.org>
Cc:	linux-rockchip@...ts.infradead.org, ykk@...k-chips.com,
	mark.yao@...k-chips.com, briannorris@...omium.org,
	amstan@...omium.org, robh+dt@...nel.org, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, linux@....linux.org.uk,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: Add the hdmi-ddc pinctrl settings for rk3288

Am Mittwoch, 2. September 2015, 14:54:22 schrieb Douglas Anderson:
> The pins for i2c5 can either be configured as "I2C5" which means that
> they're controlled by the normal RK3288 I2C controller or as "EDP / HDMI
> I2C".  It's unclear why EDP is referenced here since apparently setting
> the mux to this position enables I2C communication using the dw_hdmi
> block with a patch like <https://patchwork.kernel.org/patch/7098101/>.
> 
> There appear to be some reasons why using the builtin I2C controller in
> dw_hdmi is better than using the normal RK3288 I2C controller, so boards
> based on rk3288 might eventually want to use this pinmux if it's known
> to work.
> 
> Once driver support in dw_hdmi lands, boards would use this by selecting
> this pinctrl for the HDMI block and then _not_ specifying a ddc-i2c-bus
> and _not_ setting the status to "okay" for i2c5 (which uses the same
> pins).
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>

applied to my dts branch for 4.4


Thanks
Heiko
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