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

Avalon Vargas via B4 Relay posted 1 patch 1 week, 3 days ago
There is a newer version of this series
arch/arm64/boot/dts/qcom/x1e80100-dell-inspiron-14-plus-7441.dts | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
[PATCH] arm64: dts: qcom: Fix touchscreen address on Dell Inspiron 7441
Posted by Avalon Vargas via B4 Relay 1 week, 3 days ago 
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. Touch input and suspend/resume
have been verified on the affected Inspiron using Linux 7.2.4 with
the equivalent device-tree overlay.

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.

Validation: Linux 7.2.4 plus the equivalent local DT overlay, physical
---
 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 75e10d9..0cf5716 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>
Re: [PATCH] arm64: dts: qcom: Fix touchscreen address on Dell Inspiron 7441
Posted by Bryan O'Donoghue 1 week, 3 days ago 
On 14/09/2026 14:30, 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. Touch input and suspend/resume
> have been verified on the affected Inspiron using Linux 7.2.4 with
> the equivalent device-tree overlay.
> 
> 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.
> 
> Validation: Linux 7.2.4 plus the equivalent local DT overlay, physical
> ---
>   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 75e10d9..0cf5716 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>;
Nice.

A Fix should have a

Fixes: tag
Cc: stable@vger.kernel.org

---
bod
Re: [PATCH] arm64: dts: qcom: Fix touchscreen address on Dell Inspiron 7441
Posted by Abel Vesa 1 week, 3 days ago 
On 26-09-14 07:30:47, 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. 


> Touch input and suspend/resume
> have been verified on the affected Inspiron using Linux 7.2.4 with
> the equivalent device-tree overlay.

Drop this last part, as it is irrelevant in this specific case.
[PATCH v2] arm64: dts: qcom: Fix touchscreen address on Dell Inspiron 7441
Posted by Avalon Vargas via B4 Relay 1 week, 3 days ago 
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.

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.

Validation: Linux 7.2.4 plus the equivalent local DT overlay, physical
---
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>
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 75e10d9..0cf5716 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>
[PATCH v3] arm64: dts: qcom: Fix touchscreen address on Dell Inspiron 7441
Posted by Avalon Vargas via B4 Relay 1 week, 3 days ago 
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.

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>
Re: [PATCH v3] arm64: dts: qcom: Fix touchscreen address on Dell Inspiron 7441
Posted by Abel Vesa 1 week, 2 days ago 
On 26-09-14 16:04:23, 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>

Please stop sending new versions as replies to the older ones.
It becomes hard to follow when looking at the thread.

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