[PATCH v5 0/2] Subject: arm64: qcom: shikra-iqs-evk: Add LT9611UXD HDMI bridge support

[PATCH v5 0/2] Subject: arm64: qcom: shikra-iqs-evk: Add LT9611UXD HDMI bridge support

[Mohit Dsor]

Add MDSS display and LT9611UXD DSI-to-HDMI bridge support for the
Shikra IQS EVK, and enable the LT9611C bridge driver in defconfig.

Dependencies:
https://lore.kernel.org/all/20260930-shikra-dt-changes-v5-0-8eaf658a0e38@oss.qualcomm.com/
https://lore.kernel.org/all/20260916-lt9611c-v7-v16-0-c65042fcd245@oss.qualcomm.com/

Changes in v5:
- Rename node from lt9611uxd@41 to hdmi-bridge@41 and add label hdmi_bridge
  to decouple node name from the bridge chip (Dmitry).
- Rename endpoint labels: lt9611_a -> bridge_dsi_in,
  lt9611_out -> hdmi_connector_out (Dmitry).
- Sort &tlmm pinctrl states and pinctrl-0 by GPIO number (Dmitry).
- Fix defconfig commit message to describe generic driver usage
  rather than Qualcomm-specific board (Krzysztof).
- Add Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
  to defconfig patch.
- Link to v4: https://lore.kernel.org/all/20261007-master_lt9611uxd-v4-0-9986704e2a7b@oss.qualcomm.com/

Changes in v4:
- Rebased on top of next-20260929 (linux-next tag).
- Only two prerequisites remain: the display v5 series and the LT9611C
  driver v16 series, as all other dependencies have sincelanded in
  linux-next.
- Rename lt9611-specific regulator and pinctrl labels to more generic
  names since these will be shared with other display interfaces in DT
  overlay.
- Link to v3: https://lore.kernel.org/all/20260728-shikra-work-v3-0-e08c322596ac@oss.qualcomm.com/

Changes in v3:
- Remove superfluous comment from pm8150_l11 regulator node.
- Link to v2: https://lore.kernel.org/all/20260717-shikra-work-v2-0-86ae8552259e@oss.qualcomm.com/

Changes in v2:
- Removed port-select property.
- reset and irq is aligned as per driver.
- Rebase on top of shikra-display-v4 series to pass schema check.
- Link to v1 [1/2]: https://lore.kernel.org/lkml/20260627-shikra-dt-changes-v1-5-449a402673d0@oss.qualcomm.com/
- Link to v1 [2/2]: https://lore.kernel.org/lkml/20260618-shikra-work-v1-1-dc30381263f9@oss.qualcomm.com/

prerequisite-message-id: <20260930-shikra-dt-changes-v5-0-8eaf658a0e38@oss.qualcomm.com>
prerequisite-message-id: <https://lore.kernel.org/lkml/20260916-lt9611c-v7-v16-0-c65042fcd245@oss.qualcomm.com>

Signed-off-by: Mohit Dsor <mohit.dsor@oss.qualcomm.com>
base-commit: 6474fa070f2b8013b4b87350b775b8c3be6e8aac
change-id: 20260618-shikra-work-ea756b564b2d
---
Mohit Dsor (2):
      arm64: dts: qcom: shikra-iqs-evk: Add LT9611UXD HDMI bridge support
      arm64: defconfig: Enable LT9611C bridge driver

 arch/arm64/boot/dts/qcom/shikra-iqs-evk.dts | 109 ++++++++++++++++++++++++++++
 arch/arm64/configs/defconfig                |   1 +
 2 files changed, 110 insertions(+)
---
base-commit: fcc65d3aba5059dd1105276e180c624110761d8f
change-id: 20260618-shikra-work-ea756b564b2d

Best regards,
--  
Mohit Dsor <mohit.dsor@oss.qualcomm.com>

[PATCH v5 1/2] arm64: dts: qcom: shikra-iqs-evk: Add LT9611UXD HDMI bridge support

[Mohit Dsor]

Enable the Shikra MDSS display subsystem on the Qualcomm Shikra IQS
EVK board and add the Lontium LT9611UXD DSI-to-HDMI bridge node.

The LT9611UXD is connected via I2C (bus 4, address 0x41), powered by
a GPIO-controlled 3.3V regulator (PM8150 GPIO4) and an always-on 1.8V
rail. Reset is on GPIO76 and interrupt on GPIO85.

The bridge receives DSI output from MDSS and drives an HDMI-A
connector, with the link wired as: DPU -> DSI0 -> LT9611UXD -> HDMI.

Regulator and pinctrl labels use generic board-level names
(vreg_disp_3p3, bridge_irq_pin, bridge_rst_pin) to decouple them
from the bridge chip.

Signed-off-by: Mohit Dsor <mohit.dsor@oss.qualcomm.com>
---
 arch/arm64/boot/dts/qcom/shikra-iqs-evk.dts | 109 ++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/shikra-iqs-evk.dts b/arch/arm64/boot/dts/qcom/shikra-iqs-evk.dts
index 5df30ad8211f..996f645a3628 100644
--- a/arch/arm64/boot/dts/qcom/shikra-iqs-evk.dts
+++ b/arch/arm64/boot/dts/qcom/shikra-iqs-evk.dts
@@ -8,6 +8,7 @@
 #include "shikra-iqs-som.dtsi"
 #include "shikra-evk.dtsi"
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/interrupt-controller/irq.h>
 
 / {
 	model = "Qualcomm Technologies, Inc. Shikra IQS EVK";
@@ -23,6 +24,98 @@ aliases {
 	chosen {
 		stdout-path = "serial0:115200n8";
 	};
+
+	hdmi_connector: hdmi-connector {
+		compatible = "hdmi-connector";
+		type = "a";
+
+		port {
+			hdmi_con: endpoint {
+				remote-endpoint = <&hdmi_connector_out>;
+			};
+		};
+	};
+
+	vreg_disp_3p3: regulator-disp-3p3 {
+		compatible = "regulator-fixed";
+		regulator-name = "vreg_disp_3p3";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		gpio = <&pm8150_gpios 4 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+		pinctrl-0 = <&lcd_bias_en>;
+		pinctrl-names = "default";
+	};
+};
+
+&i2c4 {
+	status = "okay";
+
+	hdmi_bridge: hdmi-bridge@41 {
+		compatible = "lontium,lt9611uxd";
+		reg = <0x41>;
+		interrupts-extended = <&tlmm 85 IRQ_TYPE_EDGE_FALLING>;
+		reset-gpios = <&tlmm 76 GPIO_ACTIVE_LOW>;
+		vcc-supply = <&vreg_disp_3p3>;
+		vdd-supply = <&pm8150_s4>;
+
+		pinctrl-0 = <&bridge_rst_pin &bridge_irq_pin>;
+		pinctrl-names = "default";
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+
+				bridge_dsi_in: endpoint {
+					remote-endpoint = <&mdss_dsi0_out>;
+				};
+			};
+
+			port@2 {
+				reg = <2>;
+
+				hdmi_connector_out: endpoint {
+					remote-endpoint = <&hdmi_con>;
+				};
+			};
+		};
+	};
+};
+
+&mdss {
+	status = "okay";
+};
+
+&mdss_dsi0 {
+	vdda-supply = <&pm8150_l11>;
+
+	status = "okay";
+};
+
+&mdss_dsi0_out {
+	remote-endpoint = <&bridge_dsi_in>;
+	data-lanes = <0 1 2 3>;
+};
+
+&mdss_dsi0_phy {
+	status = "okay";
+};
+
+&pm8150_gpios {
+	lcd_bias_en: lcd-bias-en-state {
+		pins = "gpio4";
+		function = PMIC_GPIO_FUNC_NORMAL;
+		bias-disable;
+	};
+};
+
+&pm8150_l11 {
+	regulator-min-microvolt = <1232000>;
+	regulator-max-microvolt = <1232000>;
+	regulator-allow-set-load;
 };
 
 &remoteproc_cdsp {
@@ -67,6 +160,22 @@ &sdhc_2 {
 	status = "okay";
 };
 
+&tlmm {
+	bridge_rst_pin: bridge-rst-state {
+		pins = "gpio76";
+		function = "gpio";
+		drive-strength = <8>;
+		bias-disable;
+	};
+
+	bridge_irq_pin: bridge-irq-state {
+		pins = "gpio85";
+		function = "gpio";
+		drive-strength = <2>;
+		bias-disable;
+	};
+};
+
 &usb_1_hsphy {
 	vdd-supply = <&pm8150_l4>;
 	vdda-pll-supply = <&pm8150_l12>;

-- 
2.34.1

Re: [PATCH v5 1/2] arm64: dts: qcom: shikra-iqs-evk: Add LT9611UXD HDMI bridge support

[Konrad Dybcio]

On 10/15/26 11:15 AM, Mohit Dsor wrote:
> Enable the Shikra MDSS display subsystem on the Qualcomm Shikra IQS
> EVK board and add the Lontium LT9611UXD DSI-to-HDMI bridge node.
> 
> The LT9611UXD is connected via I2C (bus 4, address 0x41), powered by
> a GPIO-controlled 3.3V regulator (PM8150 GPIO4) and an always-on 1.8V
> rail. Reset is on GPIO76 and interrupt on GPIO85.
> 
> The bridge receives DSI output from MDSS and drives an HDMI-A
> connector, with the link wired as: DPU -> DSI0 -> LT9611UXD -> HDMI.
> 
> Regulator and pinctrl labels use generic board-level names
> (vreg_disp_3p3, bridge_irq_pin, bridge_rst_pin) to decouple them
> from the bridge chip.
> 
> Signed-off-by: Mohit Dsor <mohit.dsor@oss.qualcomm.com>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>

Konrad

Re: [PATCH v5 1/2] arm64: dts: qcom: shikra-iqs-evk: Add LT9611UXD HDMI bridge support

[Bjorn Andersson]

On Thu, Oct 15, 2026 at 02:45:28PM +0530, Mohit Dsor wrote:
[..]
> +&i2c4 {
> +	status = "okay";
> +
> +	hdmi_bridge: hdmi-bridge@41 {
> +		compatible = "lontium,lt9611uxd";

This dependency still isn't met, dropping these patches. Resubmit once
there are no dependencies.

Thanks,
Bjorn

[PATCH v5 2/2] arm64: defconfig: Enable LT9611C bridge driver

[Mohit Dsor]

Enable the Lontium LT9611C(EX/UXD) DSI-to-HDMI bridge driver as a
module. The LT9611C family supports single or dual MIPI DSI input and
outputs HDMI, and is used on multiple ARM64 platforms.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Mohit Dsor <mohit.dsor@oss.qualcomm.com>
---
 arch/arm64/configs/defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 65fcbbfc1601..d18f72e55330 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -977,6 +977,7 @@ CONFIG_DRM_I2C_NXP_TDA998X=m
 CONFIG_DRM_ITE_IT6263=m
 CONFIG_DRM_LONTIUM_LT8912B=m
 CONFIG_DRM_LONTIUM_LT9611=m
+CONFIG_DRM_LONTIUM_LT9611C=m
 CONFIG_DRM_LONTIUM_LT9611UXC=m
 CONFIG_DRM_LONTIUM_LT8713SX=m
 CONFIG_DRM_ITE_IT66121=m

-- 
2.34.1