Re: [PATCH v3] arm64: dts: qcom: Fix touchscreen address on Dell Inspiron 7441

[Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>]

On 9/15/26 12:04 AM, Avalon Vargas via B4 Relay wrote:
> From: Avalon Vargas <avalon.vargas.centeno@est.una.ac.cr>
> 
> The LXST2021 touchscreen on the tested Dell Inspiron 14 Plus 7441
> responds at I2C address 0x09, while the device tree specifies 0x10.
> Probing the latter fails with -ENXIO and no touchscreen input device
> is registered.
> 
> Use address 0x09, matching the LXST2021 configuration on the related
> Dell Latitude 7455. With this address, the controller identifies as
> 29BD:1103 and binds to hid-multitouch.
> 
> Fixes: e7733b42111c ("arm64: dts: qcom: Add support for Dell Inspiron 7441 / Latitude 7455")
> Signed-off-by: Avalon Vargas <avalon.vargas.centeno@est.una.ac.cr>
> ---
> This replaces the earlier report-plus-diff with a patch submission.
> Only one unit has been tested. I have no evidence of double-sourcing
> or a working Inspiron touchscreen at 0x10; a typo remains possible.
> 
> touch input and suspend/resume. The native upstream patch has not yet
> undergone a full kernel DTB build or dtbs_check.

This is a prerequisite for all contributions.

Bryan, does the touchscreen work for you without this patch? Is this simply
double-sourcing?

Konrad

> 
> Validation: Linux 7.2.4 plus the equivalent local DT overlay, physical
> ---
> Changes in v3:
> - Add the Fixes tag for the commit that introduced the incorrect address.
> - Link to v2: https://patch.msgid.link/20260914-dell7441-touchscreen-v2-1-7f7224c0cce5@est.una.ac.cr
> 
> Changes in v2:
> - Drop the testing details from the commit message as requested.
> - Link to v1: https://patch.msgid.link/20260914-dell7441-touchscreen-v1-1-d79540ca5e81@est.una.ac.cr
> 
> To: Bjorn Andersson <andersson@kernel.org>
> To: Konrad Dybcio <konradybcio@kernel.org>
> To: Rob Herring <robh@kernel.org>
> To: Krzysztof Kozlowski <krzk+dt@kernel.org>
> To: Conor Dooley <conor+dt@kernel.org>
> To: Laurentiu Tudor <laurentiu.tudor1@dell.com>
> To: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
> To: Val Packett <val@packett.cool>
> Cc: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
> Cc: linux-arm-msm@vger.kernel.org
> Cc: devicetree@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> ---
>  arch/arm64/boot/dts/qcom/x1e80100-dell-inspiron-14-plus-7441.dts | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/x1e80100-dell-inspiron-14-plus-7441.dts b/arch/arm64/boot/dts/qcom/x1e80100-dell-inspiron-14-plus-7441.dts
> index 75e10d97c..0cf5716cd 100644
> --- a/arch/arm64/boot/dts/qcom/x1e80100-dell-inspiron-14-plus-7441.dts
> +++ b/arch/arm64/boot/dts/qcom/x1e80100-dell-inspiron-14-plus-7441.dts
> @@ -25,9 +25,10 @@ &gpu_zap_shader {
>  };
>  
>  &i2c8 {
> -	touchscreen@10 {
> +	/* LXST2021 */
> +	touchscreen@9 {
>  		compatible = "hid-over-i2c";
> -		reg = <0x10>;
> +		reg = <0x09>;
>  
>  		hid-descr-addr = <0x1>;
>  		interrupts-extended = <&tlmm 51 IRQ_TYPE_LEVEL_LOW>;
> 
> ---
> base-commit: 704340f1cd0dcef829eb62f5b48ae95a2ce17bdf
> change-id: 20260914-dell7441-touchscreen-6b6201348ab6
> 
> Best regards,
> --  
> Avalon Vargas <avalon.vargas.centeno@est.una.ac.cr>