linux-kernel - Re: [PATCH v1] arm64: dts: qcom: sc7180: Add DisplayPort HPD pin dt node

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <159770465685.2423498.15137387317243148552@swboyd.mtv.corp.google.com>
Date:   Mon, 17 Aug 2020 15:50:56 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Tanmay Shah <tanmay@...eaurora.org>, devicetree@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        seanpaul@...omium.org, robdclark@...il.com, daniel@...ll.ch,
        airlied@...ux.ie, aravindh@...eaurora.org, abhinavk@...eaurora.org,
        khsieh@...eaurora.org, Tanmay Shah <tanmay@...eaurora.org>
Subject: Re: [PATCH v1] arm64: dts: qcom: sc7180: Add DisplayPort HPD pin dt node

Quoting Tanmay Shah (2020-08-17 15:45:27)
> This node defines alternate DP HPD functionality of GPIO.
> 
> Signed-off-by: Tanmay Shah <tanmay@...eaurora.org>
> ---
>  arch/arm64/boot/dts/qcom/sc7180.dtsi | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> index bf2f2bb1aa79..9f97cf5dd9ab 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> @@ -1457,6 +1457,20 @@ pinconf-sd-cd {
>                                         drive-strength = <2>;
>                                 };
>                         };
> +
> +                       dp_hot_plug_det: dp-hot-plug-det {
> +                               pinmux {
> +                                       pins = "gpio117";
> +                                       function = "dp_hot";
> +                               };
> +
> +                               config {

The node name is usualy called pinconf. Please use that.

> +                                       pins = "gpio117";
> +                                       bias-disable;
> +                                       input-enable;
> +                                       drive-strength = <2>;

My understanding is that drive-strength doesn't do anything when the pin
is input. So this line should be removed.

> +                               };
> +                       };
>                 };
>  
>                 gpu: gpu@...0000 {
>