[PATCH v2 0/2] arm64: dts: qcom: Add RPi 7-inch DSI panel overlays for Monaco/Lemans EVK

[PATCH v2 0/2] arm64: dts: qcom: Add RPi 7-inch DSI panel overlays for Monaco/Lemans EVK

[Shashank Maurya]

Add device tree overlays to enable support for the Raspberry Pi 7-inch
DSI touchscreen panel on Qualcomm Monaco and Lemans EVK platforms.

The overlays configure the panel on the primary DSI interface using
a 2-lane DSI connection and instantiate the panel MCU on the
corresponding touchscreen I2C bus for each platform. The changes
allow the Raspberry Pi 7-inch display to be used as an external
display option on both EVKs without affecting the default platform
configuration.

---
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: Florian Fainelli <florian.fainelli@broadcom.com>
To: Broadcom internal kernel review list <bcm-kernel-feedback-list@broadcom.com>
Cc: linux-arm-msm@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-rpi-kernel@lists.infradead.org
Cc: linux-arm-kernel@lists.infradead.org

---
Shashank Maurya (2):
      arm64: dts: qcom: monaco-evk: Add Raspberry Pi 7-inch DSI panel overlay
      arm64: dts: qcom: lemans-evk: Add Raspberry Pi 7-inch DSI panel overlay

 arch/arm64/boot/dts/qcom/Makefile                  |  4 ++
 .../dts/qcom/lemans-evk-raspberrypi-dsi-7inch.dtso | 83 ++++++++++++++++++++++
 .../dts/qcom/monaco-evk-raspberrypi-dsi-7inch.dtso | 82 +++++++++++++++++++++
 3 files changed, 169 insertions(+)
---
base-commit: ed2647532a225739e86c7f236a2ce82764ec2772
change-id: 20260907-rpi_dts_overlay-58088ffce047
prerequisite-message-id: <20260907-rpi_reg-v2-0-0c59aa60d31f@oss.qualcomm.com>
prerequisite-patch-id: 5212bf185b35c36ed8857a67f29e60386d59ac60
prerequisite-patch-id: 056a90b913170106a6f8c1feb2366ee83c4375b9

Best regards,
--  
Shashank Maurya <shashank.maurya@oss.qualcomm.com>

[PATCH v2 1/2] arm64: dts: qcom: monaco-evk: Add Raspberry Pi 7-inch DSI panel overlay

[Shashank Maurya]

Add a DT overlay for the Raspberry Pi 7" DSI touchscreen panel on
Monaco EVK, using mdss_dsi0 with 2 data lanes and the panel MCU on
I2C8.

Signed-off-by: Shashank Maurya <shashank.maurya@oss.qualcomm.com>
---
 arch/arm64/boot/dts/qcom/Makefile                  |  2 +
 .../dts/qcom/monaco-evk-raspberrypi-dsi-7inch.dtso | 82 ++++++++++++++++++++++
 2 files changed, 84 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
index 1c86e7e98f55..38554195fc98 100644
--- a/arch/arm64/boot/dts/qcom/Makefile
+++ b/arch/arm64/boot/dts/qcom/Makefile
@@ -71,6 +71,8 @@ monaco-evk-el2-dtbs := monaco-evk.dtb monaco-el2.dtbo
 dtb-$(CONFIG_ARCH_QCOM)	+= monaco-evk-el2.dtb
 monaco-evk-ifp-mezzanine-dtbs	:= monaco-evk.dtb monaco-evk-ifp-mezzanine.dtbo
 dtb-$(CONFIG_ARCH_QCOM)	+= monaco-evk-ifp-mezzanine.dtb
+monaco-evk-raspberrypi-dsi-7inch-dtbs	:= monaco-evk.dtb monaco-evk-raspberrypi-dsi-7inch.dtbo
+dtb-$(CONFIG_ARCH_QCOM)	+= monaco-evk-raspberrypi-dsi-7inch.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= msm8216-samsung-fortuna3g.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= msm8916-acer-a1-724.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= msm8916-alcatel-idol347.dtb
diff --git a/arch/arm64/boot/dts/qcom/monaco-evk-raspberrypi-dsi-7inch.dtso b/arch/arm64/boot/dts/qcom/monaco-evk-raspberrypi-dsi-7inch.dtso
new file mode 100644
index 000000000000..f27b5a4a6093
--- /dev/null
+++ b/arch/arm64/boot/dts/qcom/monaco-evk-raspberrypi-dsi-7inch.dtso
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+ */
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+
+&{/} {
+	display_bl: backlight {
+		compatible = "pwm-backlight";
+		power-supply = <&reg_dsi_touch>;
+		pwms = <&reg_backlight 0 50000 0>;
+	};
+
+	reg_dsi_touch: regulator-touch {
+		compatible = "regulator-fixed";
+		regulator-name = "rpi-touch";
+		regulator-min-microvolt = <5500000>;
+		regulator-max-microvolt = <5500000>;
+		gpio = <&expander3 5 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+		regulator-always-on;
+	};
+};
+
+&i2c8 {
+	qcom,load-firmware;
+	qcom,xfer-mode = <1>;
+
+	status = "okay";
+
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	reg_backlight: reg_backlight@45 {
+		compatible = "raspberrypi,touchscreen-panel-regulator-v2";
+		reg = <0x45>;
+
+		vcc-supply = <&reg_dsi_touch>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		#pwm-cells = <3>;
+	};
+};
+
+&mdss_dsi0 {
+	vdda-supply = <&vreg_l1c>;
+
+	status = "okay";
+
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	panel@0 {
+		compatible = "raspberrypi,dsi-7inch";
+		reg = <0>;
+
+		reset-gpios = <&reg_backlight 0 GPIO_ACTIVE_LOW>;
+		power-supply = <&reg_dsi_touch>;
+		iovcc-supply = <&reg_dsi_touch>;
+		backlight = <&display_bl>;
+
+		port {
+			panel0_in: endpoint {
+				remote-endpoint = <&mdss_dsi0_out>;
+			};
+		};
+	};
+};
+
+&mdss_dsi0_out {
+	remote-endpoint = <&panel0_in>;
+	data-lanes = <0 1>;
+};
+
+&mdss_dsi0_phy {
+	vdds-supply = <&vreg_l4a>;
+
+	status = "okay";
+};

-- 
2.34.1

Re: [PATCH v2 1/2] arm64: dts: qcom: monaco-evk: Add Raspberry Pi 7-inch DSI panel overlay

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 3 potential issue(s) to consider:
- [Medium] The overlay uses 'regulator-always-on' for 'reg_dsi_touch' to work around missing regulator support in the 'rpi-touchscreen-v2' driver, breaking power management.
- [Low] The &i2c8 node contains undocumented downstream properties 'qcom,load-firmware' and 'qcom,xfer-mode'.
- [Low] The panel node is missing the required fallback compatible string 'ilitek,ili9881c'.
--

commit ea08b302349d4826d0dcf202cbbe6bec559335f7
Author: Shashank Maurya <shashank.maurya@oss.qualcomm.com>

arm64: dts: qcom: monaco-evk: Add Raspberry Pi 7-inch DSI panel overlay

This commit adds a device tree overlay for the Raspberry Pi 7-inch DSI
touchscreen panel on the Monaco EVK platform. It enables mdss_dsi0 with 2 data
lanes and configures the panel MCU on I2C8.

> diff --git a/arch/arm64/boot/dts/qcom/monaco-evk-raspberrypi-dsi-7inch.dtso b/arch/arm64/boot/dts/qcom/monaco-evk-raspberrypi-dsi-7inch.dtso
> new file mode 100644
> index 0000000000000..f27b5a4a60934
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/monaco-evk-raspberrypi-dsi-7inch.dtso

[ ... ]

> +	reg_dsi_touch: regulator-touch {
> +		compatible = "regulator-fixed";
> +		regulator-name = "rpi-touch";
> +		regulator-min-microvolt = <5500000>;
> +		regulator-max-microvolt = <5500000>;
> +		gpio = <&expander3 5 GPIO_ACTIVE_HIGH>;
> +		enable-active-high;
> +		regulator-always-on;

[Severity: Medium]
Does this regulator-always-on property prevent the display from being powered
down?

It appears this forces the regulator to remain active because the I2C MCU
driver (rpi-panel-v2-regulator) does not acquire or enable vcc-supply.

While this ensures the MCU has power during I2C probe, it structurally
prevents the display driver from legitimately disabling power during system
suspend or display blanking, leading to increased power consumption.

> +	};
> +};
> +
> +&i2c8 {
> +	qcom,load-firmware;
> +	qcom,xfer-mode = <1>;

[Severity: Low]
Are these downstream properties supported by the upstream device tree schemas?

Adding qcom,load-firmware and qcom,xfer-mode directly to the I2C bus node
will lead to dtbs_check validation failures during compilation since they are
undocumented.

> +
> +	status = "okay";

[ ... ]

> +&mdss_dsi0 {
> +	vdda-supply = <&vreg_l1c>;
> +
> +	status = "okay";
> +
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +
> +	panel@0 {
> +		compatible = "raspberrypi,dsi-7inch";

[Severity: Low]
Is this missing the required ilitek,ili9881c fallback compatible string?

The DT schema for the Ilitek ILI9881c explicitly requires the compatible string
to be an array that includes the device-specific compatible and the
ilitek,ili9881c fallback. Omitting it will cause dtbs_check validation
failures.

> +		reg = <0>;

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260907-rpi_dts_overlay-v2-0-a4989322ce00@oss.qualcomm.com?part=1

Re: [PATCH v2 1/2] arm64: dts: qcom: monaco-evk: Add Raspberry Pi 7-inch DSI panel overlay

[Konrad Dybcio]

On 9/7/26 8:33 AM, Shashank Maurya wrote:
> Add a DT overlay for the Raspberry Pi 7" DSI touchscreen panel on
> Monaco EVK, using mdss_dsi0 with 2 data lanes and the panel MCU on
> I2C8.
> 
> Signed-off-by: Shashank Maurya <shashank.maurya@oss.qualcomm.com>
> ---

[...]

> +&i2c8 {
> +	qcom,load-firmware;
> +	qcom,xfer-mode = <1>;

This property is undocumented and unconsumed

Konrad

Re: [PATCH v2 1/2] arm64: dts: qcom: monaco-evk: Add Raspberry Pi 7-inch DSI panel overlay

[Konrad Dybcio]

On 9/7/26 8:33 AM, Shashank Maurya wrote:
> Add a DT overlay for the Raspberry Pi 7" DSI touchscreen panel on
> Monaco EVK, using mdss_dsi0 with 2 data lanes and the panel MCU on
> I2C8.
> 
> Signed-off-by: Shashank Maurya <shashank.maurya@oss.qualcomm.com>
> ---

[...]

> +	reg_dsi_touch: regulator-touch {
> +		compatible = "regulator-fixed";
> +		regulator-name = "rpi-touch";
> +		regulator-min-microvolt = <5500000>;
> +		regulator-max-microvolt = <5500000>;
> +		gpio = <&expander3 5 GPIO_ACTIVE_HIGH>;
> +		enable-active-high;
> +		regulator-always-on;
> +	};

Does this need to be always-on? There's clearly a consumer for it

Konrad

[PATCH v2 2/2] arm64: dts: qcom: lemans-evk: Add Raspberry Pi 7-inch DSI panel overlay

[Shashank Maurya]

Add a DT overlay for the Raspberry Pi 7" DSI touchscreen panel on
Lemans EVK, using mdss0_dsi0 with 2 data lanes and the panel MCU on
I2C1.

Signed-off-by: Shashank Maurya <shashank.maurya@oss.qualcomm.com>
---
 arch/arm64/boot/dts/qcom/Makefile                  |  2 +
 .../dts/qcom/lemans-evk-raspberrypi-dsi-7inch.dtso | 83 ++++++++++++++++++++++
 2 files changed, 85 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
index 38554195fc98..d17b46a043ad 100644
--- a/arch/arm64/boot/dts/qcom/Makefile
+++ b/arch/arm64/boot/dts/qcom/Makefile
@@ -57,6 +57,8 @@ lemans-evk-el2-dtbs := lemans-evk.dtb lemans-el2.dtbo
 dtb-$(CONFIG_ARCH_QCOM)	+= lemans-evk-el2.dtb
 lemans-evk-ifp-mezzanine-dtbs	:= lemans-evk.dtb lemans-evk-ifp-mezzanine.dtbo
 dtb-$(CONFIG_ARCH_QCOM)	+= lemans-evk-ifp-mezzanine.dtb
+lemans-evk-raspberrypi-dsi-7inch-dtbs	:= lemans-evk.dtb lemans-evk-raspberrypi-dsi-7inch.dtbo
+dtb-$(CONFIG_ARCH_QCOM)	+= lemans-evk-raspberrypi-dsi-7inch.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= mahua-crd.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= milos-fairphone-fp6.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= milos-nothing-asteroids.dtb
diff --git a/arch/arm64/boot/dts/qcom/lemans-evk-raspberrypi-dsi-7inch.dtso b/arch/arm64/boot/dts/qcom/lemans-evk-raspberrypi-dsi-7inch.dtso
new file mode 100644
index 000000000000..14743b3c3863
--- /dev/null
+++ b/arch/arm64/boot/dts/qcom/lemans-evk-raspberrypi-dsi-7inch.dtso
@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+ */
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+
+&{/} {
+	display_bl: backlight {
+		compatible = "pwm-backlight";
+		power-supply = <&reg_dsi_touch>;
+		pwms = <&reg_backlight 0 255 0>;
+	};
+
+	reg_dsi_touch: regulator-touch {
+		compatible = "regulator-fixed";
+		regulator-name = "rpi-dsi-touch";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		gpio = <&expander3 1 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+		regulator-boot-on;
+		regulator-always-on;
+	};
+};
+
+&i2c1 {
+	qcom,load-firmware;
+	qcom,xfer-mode = <1>;
+
+	status = "okay";
+
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	reg_backlight: reg_backlight@45 {
+		compatible = "raspberrypi,touchscreen-panel-regulator-v2";
+		reg = <0x45>;
+
+		vcc-supply = <&reg_dsi_touch>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		#pwm-cells = <3>;
+	};
+};
+
+&mdss0_dsi0 {
+	vdda-supply = <&vreg_l1c>;
+
+	status = "okay";
+
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	panel@0 {
+		compatible = "raspberrypi,dsi-7inch";
+		reg = <0>;
+
+		reset-gpios = <&reg_backlight 0 GPIO_ACTIVE_LOW>;
+		power-supply = <&reg_dsi_touch>;
+		iovcc-supply = <&reg_dsi_touch>;
+		backlight = <&display_bl>;
+
+		port {
+			panel0_in: endpoint {
+				remote-endpoint = <&mdss0_dsi0_out>;
+			};
+		};
+	};
+};
+
+&mdss0_dsi0_out {
+	remote-endpoint = <&panel0_in>;
+	data-lanes = <0 1>;
+};
+
+&mdss0_dsi0_phy {
+	vdds-supply = <&vreg_l4a>;
+
+	status = "okay";
+};

-- 
2.34.1

Re: [PATCH v2 2/2] arm64: dts: qcom: lemans-evk: Add Raspberry Pi 7-inch DSI panel overlay

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 3 potential issue(s) to consider:
- [Low] Downstream-only I2C properties (`qcom,load-firmware` and `qcom,xfer-mode`) are leaked into the upstream device tree.
- [Low] The panel node is missing the mandatory fallback compatible for the ILI9881c driver.
- [Low] The regulator MCU node uses an invalid node name and includes an unsupported vcc-supply property.
--

commit c29fa706b8fbecd36dcc880f57d516cffcc9f530
Author: Shashank Maurya <shashank.maurya@oss.qualcomm.com>

arm64: dts: qcom: lemans-evk: Add Raspberry Pi 7-inch DSI panel overlay

This commit adds a device tree overlay for the Raspberry Pi 7" DSI touchscreen
panel on Lemans EVK. It configures mdss0_dsi0 with 2 data lanes and adds the
panel MCU on I2C1.

> diff --git a/arch/arm64/boot/dts/qcom/lemans-evk-raspberrypi-dsi-7inch.dtso b/arch/arm64/boot/dts/qcom/lemans-evk-raspberrypi-dsi-7inch.dtso
> new file mode 100644
> index 0000000000000..14743b3c38637
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/lemans-evk-raspberrypi-dsi-7inch.dtso

[ ... ]

> +&i2c1 {
> +	qcom,load-firmware;
> +	qcom,xfer-mode = <1>;

[Severity: Low]
Are these downstream I2C properties intended to be included in the upstream
device tree?

They do not exist in the upstream devicetree bindings and are not parsed by
mainline drivers, which will cause schema validation errors during make
dtbs_check.

> +
> +	status = "okay";
> +
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +
> +	reg_backlight: reg_backlight@45 {

[Severity: Low]
Does this node name violate the expected naming convention?

It seems it should match the ^regulator(@.*)?$ pattern inherited from
regulator.yaml to avoid dtbs_check schema validation errors.

> +		compatible = "raspberrypi,touchscreen-panel-regulator-v2";
> +		reg = <0x45>;
> +
> +		vcc-supply = <&reg_dsi_touch>;

[Severity: Low]
Is this vcc-supply property supported by the binding?

The raspberrypi,7inch-touchscreen-panel-regulator-v2.yaml specifies
additionalProperties: false and does not define vcc-supply. Since the panel
explicitly enables reg_dsi_touch anyway, should this be removed to pass
schema validation?

> +		gpio-controller;
> +		#gpio-cells = <2>;
> +		#pwm-cells = <3>;
> +	};
> +};
> +
> +&mdss0_dsi0 {
> +	vdda-supply = <&vreg_l1c>;
> +
> +	status = "okay";
> +
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +
> +	panel@0 {
> +		compatible = "raspberrypi,dsi-7inch";

[Severity: Low]
Is this missing the mandatory fallback compatible for the ILI9881c driver?

According to Documentation/devicetree/bindings/display/panel/ilitek,ili9881c.yaml,
this should be an array of two strings containing the specific panel and the
fallback ilitek,ili9881c.

> +		reg = <0>;

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260907-rpi_dts_overlay-v2-0-a4989322ce00@oss.qualcomm.com?part=2

Re: [PATCH v2 0/2] arm64: dts: qcom: Add RPi 7-inch DSI panel overlays for Monaco/Lemans EVK

[Bjorn Andersson]

On Mon, Sep 07, 2026 at 12:03:52PM +0530, Shashank Maurya wrote:
> Add device tree overlays to enable support for the Raspberry Pi 7-inch
> DSI touchscreen panel on Qualcomm Monaco and Lemans EVK platforms.
> 
> The overlays configure the panel on the primary DSI interface using
> a 2-lane DSI connection and instantiate the panel MCU on the
> corresponding touchscreen I2C bus for each platform. The changes
> allow the Raspberry Pi 7-inch display to be used as an external
> display option on both EVKs without affecting the default platform
> configuration.
> 
> ---
> 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: Florian Fainelli <florian.fainelli@broadcom.com>
> To: Broadcom internal kernel review list <bcm-kernel-feedback-list@broadcom.com>
> Cc: linux-arm-msm@vger.kernel.org
> Cc: devicetree@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Cc: linux-rpi-kernel@lists.infradead.org
> Cc: linux-arm-kernel@lists.infradead.org
> 
> ---
> Shashank Maurya (2):
>       arm64: dts: qcom: monaco-evk: Add Raspberry Pi 7-inch DSI panel overlay
>       arm64: dts: qcom: lemans-evk: Add Raspberry Pi 7-inch DSI panel overlay
> 
>  arch/arm64/boot/dts/qcom/Makefile                  |  4 ++
>  .../dts/qcom/lemans-evk-raspberrypi-dsi-7inch.dtso | 83 ++++++++++++++++++++++
>  .../dts/qcom/monaco-evk-raspberrypi-dsi-7inch.dtso | 82 +++++++++++++++++++++
>  3 files changed, 169 insertions(+)
> ---
> base-commit: ed2647532a225739e86c7f236a2ce82764ec2772
> change-id: 20260907-rpi_dts_overlay-58088ffce047
> prerequisite-message-id: <20260907-rpi_reg-v2-0-0c59aa60d31f@oss.qualcomm.com>

The two dts patches in this series clearly relates to those two
regulator patches, which has received change requests.

I would have sent the 4 patches together in a series, but as you didn't
you sent this series with unmet dependencies.

All I can do now is reject this series as well. Please send v2 once the
driver changes has been merged and you have validated this again.

Regards,
Bjorn

> prerequisite-patch-id: 5212bf185b35c36ed8857a67f29e60386d59ac60
> prerequisite-patch-id: 056a90b913170106a6f8c1feb2366ee83c4375b9
> 
> Best regards,
> --  
> Shashank Maurya <shashank.maurya@oss.qualcomm.com>
>