linux-kernel - Re: [PATCH 1/2] arm64: dts: qcom: lemans-evk: Enable GPIO expander3 interrupt for Lemans EVK

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Message-ID: <bb95f1e4-dcc0-4940-a1c3-a5e7eb658b01@oss.qualcomm.com>
Date: Fri, 6 Feb 2026 12:05:56 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Swati Agarwal <swati.agarwal@....qualcomm.com>,
        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>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] arm64: dts: qcom: lemans-evk: Enable GPIO expander3
 interrupt for Lemans EVK

On 2/6/26 11:46 AM, Swati Agarwal wrote:
> Enable PCA9538 expander3 as interrupt controller on Lemans EVK and
> configures the corresponding TLMM pins via pinctrl to operate as GPIO
> inputs with internal pull-ups.
> 
> Signed-off-by: Swati Agarwal <swati.agarwal@....qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/lemans-evk.dts | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/lemans-evk.dts b/arch/arm64/boot/dts/qcom/lemans-evk.dts
> index a549f7fe53a1..473cc2a81670 100644
> --- a/arch/arm64/boot/dts/qcom/lemans-evk.dts
> +++ b/arch/arm64/boot/dts/qcom/lemans-evk.dts
> @@ -649,6 +649,12 @@ expander3: gpio@3b {
>  		reg = <0x3b>;
>  		#gpio-cells = <2>;
>  		gpio-controller;
> +		#interrupt-cells = <2>;
> +		interrupt-controller;
> +		interrupt-parent = <&tlmm>;
> +		interrupts = <39 IRQ_TYPE_LEVEL_LOW>;
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&expander3_int>;

property-n
property-names

in this order, please

Could you wire up the interrupts from other expanders while at it?

>  	};
>  
>  	eeprom@50 {
> @@ -894,6 +900,13 @@ ethernet0_mdio: ethernet0-mdio-pins {
>  		};
>  	};
>  
> +	expander3_int: expander3-int-state {
> +		pins = "gpio39";
> +		function = "gpio";
> +		input-enable;

input-enable is not allowed for TLMM GPIOs, please make sure to run "make dtbs_check"
(or at least make [...] CHECK_DTBS=1 qcom/lemans-evk.dtb) before submitting

Konrad