Re: [PATCH 3/5] ARM: dts: rockchip: Switch to builtin HDMI DDC bus on rk3288-veyron

From: Sean Paul <sean@poorly.run>
To: Douglas Anderson <dianders@chromium.org>
Cc: Heiko Stuebner <heiko@sntech.de>,
	Sandy Huang <hjc@rock-chips.com>,
	Andrzej Hajda <a.hajda@samsung.com>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
	Rob Herring <robh+dt@kernel.org>,
	linux-rockchip@lists.infradead.org,
	Neil Armstrong <narmstrong@baylibre.com>,
	Mark Rutland <mark.rutland@arm.com>,
	mka@chromium.org, Sean Paul <seanpaul@chromium.org>,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 3/5] ARM: dts: rockchip: Switch to builtin HDMI DDC bus on rk3288-veyron
Date: Wed, 15 May 2019 14:25:44 -0400	[thread overview]
Message-ID: <20190515182544.GW17077@art_vandelay> (raw)
In-Reply-To: <20190502225336.206885-3-dianders@chromium.org>

On Thu, May 02, 2019 at 03:53:34PM -0700, Douglas Anderson wrote:
> Downstream Chrome OS kernels use the builtin DDC bus from dw_hdmi on
> veyron.  This is the only way to get them to negotiate HDCP.
> 
> Although HDCP isn't currently all supported upstream, it still seems
> like it makes sense to use dw_hdmi's builtin I2C.  Maybe eventually we
> can get HDCP negotiation working.
> 
> Signed-off-by: Douglas Anderson <dianders@chromium.org>

Reviewed-by: Sean Paul <sean@poorly.run>

> ---
> 
>  arch/arm/boot/dts/rk3288-veyron.dtsi | 11 ++---------
>  1 file changed, 2 insertions(+), 9 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/rk3288-veyron.dtsi b/arch/arm/boot/dts/rk3288-veyron.dtsi
> index 1252522392c7..e1bee663d2c5 100644
> --- a/arch/arm/boot/dts/rk3288-veyron.dtsi
> +++ b/arch/arm/boot/dts/rk3288-veyron.dtsi
> @@ -163,7 +163,8 @@
>  };
>  
>  &hdmi {
> -	ddc-i2c-bus = <&i2c5>;
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&hdmi_ddc>;
>  	status = "okay";
>  };
>  
> @@ -334,14 +335,6 @@
>  	i2c-scl-rising-time-ns = <300>;		/* 225ns measured */
>  };
>  
> -&i2c5 {
> -	status = "okay";
> -
> -	clock-frequency = <100000>;
> -	i2c-scl-falling-time-ns = <300>;
> -	i2c-scl-rising-time-ns = <1000>;
> -};
> -
>  &io_domains {
>  	status = "okay";
>  
> -- 
> 2.21.0.1020.gf2820cf01a-goog
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS