linux-kernel - Re: [PATCH v3 2/2] arm64: dts: qcom: x1e80100-yoga: Update panel bindings

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Message-ID: <Zqi5rUQqWa9wZCva@linaro.org>
Date: Tue, 30 Jul 2024 12:00:13 +0200
From: Stephan Gerhold <stephan.gerhold@...aro.org>
To: Rob Clark <robdclark@...il.com>
Cc: linux-arm-msm@...r.kernel.org, Abel Vesa <abel.vesa@...aro.org>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Rob Clark <robdclark@...omium.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" <devicetree@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/2] arm64: dts: qcom: x1e80100-yoga: Update panel
 bindings

On Mon, Jul 29, 2024 at 01:57:25PM -0700, Rob Clark wrote:
> From: Rob Clark <robdclark@...omium.org>
> 
> Use the correct panel compatible, and wire up enable-gpio.  It is wired
> up in the same way as the x1e80100-crd.
> 
> Signed-off-by: Rob Clark <robdclark@...omium.org>
> Reviewed-by: Abel Vesa <abel.vesa@...aro.org>
> ---
> Note that the power-source differs from the CRD.  Figured that out by
> diffing $debugfs/gpio.
> 
>  .../dts/qcom/x1e80100-lenovo-yoga-slim7x.dts    | 17 +++++++++++++++--
>  1 file changed, 15 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts b/arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts
> index 70977e9fa266..6f8d52c368a4 100644
> --- a/arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts
> +++ b/arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts
> [...]
> @@ -669,6 +672,16 @@ &pcie6a_phy {
>  	status = "okay";
>  };
>  
> +&pmc8380_3_gpios {
> +	edp_bl_en: edp-bl-en-state {
> +		pins = "gpio4";
> +		function = "normal";
> +		power-source = <0>; /* 1.8V */

Hm, are you sure the firmware sets it like this?

power-source = <0> is typically VPH, i.e. the main battery supply
voltage or similar. This will definitely be higher than 1.8V. It seems a
bit odd to use a variable voltage source for a GPIO...

Thanks,
Stephan