linux-kernel - Re: [PATCH 4/5] ARM: dts: rockchip: Add unwedge pinctrl entries for dw

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Message-ID: <20190515182553.GX17077@art_vandelay>
Date:   Wed, 15 May 2019 14:25:53 -0400
From:   Sean Paul <sean@...rly.run>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Heiko Stuebner <heiko@...ech.de>, Sandy Huang <hjc@...k-chips.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Rob Herring <robh+dt@...nel.org>,
        linux-rockchip@...ts.infradead.org,
        Neil Armstrong <narmstrong@...libre.com>,
        Mark Rutland <mark.rutland@....com>, mka@...omium.org,
        Sean Paul <seanpaul@...omium.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 4/5] ARM: dts: rockchip: Add unwedge pinctrl entries for
 dw_hdmi on rk3288

On Thu, May 02, 2019 at 03:53:35PM -0700, Douglas Anderson wrote:
> This adds the "unwedge" pinctrl entries introduced by a recent dw_hdmi
> change that can unwedge the dw_hdmi i2c bus in some cases.  It's
> expected that any boards using this would add:
> 
>   pinctrl-names = "default", "unwedge";
>   pinctrl-0 = <&hdmi_ddc>;
>   pinctrl-1 = <&hdmi_ddc_unwedge>;
> 
> Note that this isn't added by default because some boards may choose
> to mux i2c5 for their DDC bus (if that is more tested for them).
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>

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

> ---
> 
>  arch/arm/boot/dts/rk3288.dtsi | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi
> index 74c9517c4f92..eebc04fa1e4d 100644
> --- a/arch/arm/boot/dts/rk3288.dtsi
> +++ b/arch/arm/boot/dts/rk3288.dtsi
> @@ -1545,6 +1545,15 @@
>  				rockchip,pins = <7 RK_PC3 2 &pcfg_pull_none>,
>  						<7 RK_PC4 2 &pcfg_pull_none>;
>  			};
> +
> +			hdmi_ddc_unwedge: hdmi-ddc-unwedge {
> +				rockchip,pins = <7 RK_PC3 RK_FUNC_GPIO &pcfg_output_low>,
> +						<7 RK_PC4 2 &pcfg_pull_none>;
> +			};
> +		};
> +
> +		pcfg_output_low: pcfg-output-low {
> +			output-low;
>  		};
>  
>  		pcfg_pull_up: pcfg-pull-up {
> -- 
> 2.21.0.1020.gf2820cf01a-goog
> 

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