linux-kernel - Re: [PATCH] arm64: dts: qcom: milos-fairphone-fp6: Add Hall Effect sensor

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Message-ID: <syvoq2q2zol7vx7u42c4ypsh6d2ambz575ygegkn5t4pbqifpv@p7wkafrfulc5>
Date: Fri, 16 Jan 2026 18:29:12 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Luca Weiss <luca.weiss@...rphone.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: milos-fairphone-fp6: Add Hall Effect
 sensor

On Fri, Jan 16, 2026 at 03:22:52PM +0100, Luca Weiss wrote:
> Add a node for the Hall Effect sensor, used to detect whether the Flip
> Cover is closed or not.
> 
> The sensor is powered through vreg_l10b, so let's put a
> regulator-always-on on that to make sure the sensor gets power.
> 
> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> ---
>  arch/arm64/boot/dts/qcom/milos-fairphone-fp6.dts | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/milos-fairphone-fp6.dts b/arch/arm64/boot/dts/qcom/milos-fairphone-fp6.dts
> index 7629ceddde2a..98b3fc654206 100644
> --- a/arch/arm64/boot/dts/qcom/milos-fairphone-fp6.dts
> +++ b/arch/arm64/boot/dts/qcom/milos-fairphone-fp6.dts
> @@ -32,6 +32,16 @@ gpio-keys {
>  		pinctrl-0 = <&volume_up_default>;

It would be nice to add pinctrl for it too.

>  		pinctrl-names = "default";
>  
> +		/* Powered by the always-on vreg_l10b */
> +		event-hall-sensor {
> +			label = "Hall Effect Sensor";
> +			gpios = <&tlmm 70 GPIO_ACTIVE_LOW>;
> +			linux,input-type = <EV_SW>;
> +			linux,code = <SW_LID>;
> +			linux,can-disable;
> +			wakeup-source;
> +		};
> +
>  		key-volume-up {
>  			label = "Volume Up";
>  			gpios = <&pm7550_gpios 6 GPIO_ACTIVE_LOW>;
> @@ -316,6 +326,8 @@ vreg_l10b: ldo10 {
>  			regulator-min-microvolt = <1800000>;
>  			regulator-max-microvolt = <1800000>;
>  			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
> +			/* Hall sensor VDD */
> +			regulator-always-on;
>  		};
>  
>  		vreg_l11b: ldo11 {
> 
> ---
> base-commit: ef1c7b875741bef0ff37ae8ab8a9aaf407dc141c
> change-id: 20260116-fp6-hall-sensor-1049f2f872ac
> 
> Best regards,
> -- 
> Luca Weiss <luca.weiss@...rphone.com>
> 

-- 
With best wishes
Dmitry