linux-kernel - Re: [PATCH v2 3/3] arm64: dts: qcom: sm6125-xiaomi-laurel-sprout: Add Focaltech FT3518 touchscreen

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Message-ID: <f11cb37f-5a84-4fcc-a4fe-6502a86fc28a@oss.qualcomm.com>
Date: Wed, 14 Jan 2026 10:36:23 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: yedaya.ka@...il.com, SzczurekYT <szczurek@...zurek.yt>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Kamil Gołda <kamil.golda@...tonmail.com>
Subject: Re: [PATCH v2 3/3] arm64: dts: qcom: sm6125-xiaomi-laurel-sprout: Add
 Focaltech FT3518 touchscreen

On 1/14/26 10:31 AM, Yedaya Katsman via B4 Relay wrote:
> From: Yedaya Katsman <yedaya.ka@...il.com>
> 
> Add device tree node for the Focaltech FT3518 touchscreen on
> Xiaomi Mi A3 (laurel-sprout).
> 
> Enable qupv3_id_0 and i2c2 bus that the touchscreen is on.
> 
> Co-developed-by: Kamil Gołda <kamil.golda@...tonmail.com>
> Signed-off-by: Kamil Gołda <kamil.golda@...tonmail.com>
> Signed-off-by: Yedaya Katsman <yedaya.ka@...il.com>
> ---
>  .../boot/dts/qcom/sm6125-xiaomi-laurel-sprout.dts  | 34 ++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm6125-xiaomi-laurel-sprout.dts b/arch/arm64/boot/dts/qcom/sm6125-xiaomi-laurel-sprout.dts
> index 994fb0412fcbdf5466f87a325c48b697a37b514b..97feed708d3b6483eab72cfb0ae39be6f5ae3a11 100644
> --- a/arch/arm64/boot/dts/qcom/sm6125-xiaomi-laurel-sprout.dts
> +++ b/arch/arm64/boot/dts/qcom/sm6125-xiaomi-laurel-sprout.dts
> @@ -119,6 +119,18 @@ active-config0 {
>  			};
>  		};
>  	};
> +
> +	ts_vdd_supply: ts-vdd-supply {
> +		compatible = "regulator-fixed";
> +		regulator-name = "ts_vdd_supply";
> +		regulator-min-microvolt = <3300000>;
> +		regulator-max-microvolt = <3300000>;
> +
> +		gpio = <&tlmm 83 GPIO_ACTIVE_HIGH>;
> +		enable-active-high;
> +
> +		startup-delay-us = <70000>;
> +	};
>  };
>  
>  &hsusb_phy1 {
> @@ -411,3 +423,25 @@ &usb3 {
>  &usb3_dwc3 {
>  	extcon = <&extcon_usb>;
>  };
> +
> +&qupv3_id_0 {
> +	status = "okay";
> +};
> +
> +&i2c2 {

Please sort the label references alphabetically

> +	status = "okay";
> +
> +	touchscreen@38 {
> +		compatible = "focaltech,ft3518";
> +		reg = <0x38>;
> +		interrupt-parent = <&tlmm>;
> +		interrupts = <88 IRQ_TYPE_EDGE_FALLING>;

interrupts-extended = <&tlmm 88 IRQ_TYPE_EDGE_FALLING>;
> +
> +		vcc-supply = <&ts_vdd_supply>;
> +
> +		reset-gpios = <&tlmm 87 GPIO_ACTIVE_LOW>;

You reference gpio83 (vdd en), 88 (interrupt) and 87 (reset), please add
a configuration for them under the TLMM node to ensure they're always in
a predictable state

You can probably find it in the downstream kernel, otherwise boot up a
downstream build and check /sys/kernel/debug/gpios

Konrad