[PATCH v2 0/2] arm64: qcom: shikra-iqs-evk: Add LT9611UXD HDMI bridge support

[PATCH v2 0/2] 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.

---
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: <20260714-shikra-dt-m1-v6-0-bee265d3499b@oss.qualcomm.com>
prerequisite-message-id: <20260703-shikra-dispcc-gpucc-v5-0-cc13826d4d5a@oss.qualcomm.com>
prerequisite-message-id: <20260608-shikra-display-v4-0-88a846afdd5d@oss.qualcomm.com>
prerequisite-message-id: <20260716-lt9611c-v7-v7-0-7553a14735fc@oss.qualcomm.com>
prerequisite-message-id: <20260713-shikra-dt-changes-v3-0-15102fca9570@oss.qualcomm.com>

Cc: linux-kernel@vger.kernel.org
Signed-off-by: Mohit Dsor <mohit.dsor@oss.qualcomm.com>
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

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
base-commit: cc2b5f627e8ccbae1188ef2d8be3e451d7f933a5
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 | 118 ++++++++++++++++++++++++++++
 arch/arm64/configs/defconfig                |   1 +
 2 files changed, 119 insertions(+)
---
base-commit: cc2b5f627e8ccbae1188ef2d8be3e451d7f933a5
change-id: 20260618-shikra-work-ea756b564b2d
prerequisite-message-id: <20260714-shikra-dt-m1-v6-0-bee265d3499b@oss.qualcomm.com>
prerequisite-patch-id: 48ecd66c06c4fad81f91283c26ec57d95bbde29d
prerequisite-patch-id: 7d92e5a301d09616840e54dc9e4a81f30a64383c
prerequisite-patch-id: be1a16f53e23dd5ab90210a056c9da3559c6186d
prerequisite-patch-id: 3eff04500c55100c763aeac1f1f8c5768d500500
prerequisite-patch-id: ab22c5fdb2fa65b78ffef76bbe4459c8d5ffe7b2
prerequisite-patch-id: cb24efedb648271ef5c60ace96e2366d89254e8f
prerequisite-patch-id: 8be7df0395c5847a988c7e814c7db878b5932b11
prerequisite-patch-id: 0510992d022cef7317b6efee6765ac78c0225356
prerequisite-patch-id: de4327fcbe81f92a337f429b74e8220969a5b79f
prerequisite-patch-id: e13435365cba0b6ecfcea6d9e5ab72838fba23a7
prerequisite-patch-id: 90f78668eb969c16ed8c2485d75a60a183fc4b8e
prerequisite-message-id: <20260703-shikra-dispcc-gpucc-v5-0-cc13826d4d5a@oss.qualcomm.com>
prerequisite-patch-id: 23b24fb512c882a045ed8339b22269bfc2c5d02c
prerequisite-patch-id: 0e79e46bc5a88849a2f0a410b39c08f3244dfed3
prerequisite-patch-id: 17b412a37859fba801efdbe451db31e5bd77438b
prerequisite-patch-id: 0396ac157aba73a5afd7ba4a8a744847f5a7b433
prerequisite-patch-id: 2b1aecd97b9c073a1b323138cd7a98cb34e3715f
prerequisite-patch-id: 823bc7bc713f6fce1b9de47a266307f1829636b9
prerequisite-patch-id: 1b990e46422307e558300815c1166b90d96fbb9d
prerequisite-patch-id: d78e0b95758b82977d80c7cf18da49661cd181e5
prerequisite-patch-id: f62b00cd64ac3191e0906514443dd43e88746818
prerequisite-patch-id: 0fab99455f954a917fb65348656505cd7ab45bc2
prerequisite-patch-id: b59fd05f9b62bda86079c9d86538b80289110862
prerequisite-patch-id: 71691d8b40e36cdbff6a52c3999ea8bb2c164d70
prerequisite-patch-id: b2868bc50d74afd13c8a0d0fd62301fa9546a211
prerequisite-patch-id: f83f24719ac475317507af09bf08b4a69b02d429
prerequisite-patch-id: c9f2942207341ad4f450b20f049199f35188c02a
prerequisite-patch-id: 3a6e9752793f2d7b084008b47daed10ea572064a
prerequisite-patch-id: 3338cdc5915c1e6b991067d3a7afb734c182663e
prerequisite-patch-id: 59cf68a3a49958a60833aa0464980f8c8d879961
prerequisite-patch-id: 5d146a518f2f76bf9fe93e23a2cfa63c73731883
prerequisite-message-id: <20260608-shikra-display-v4-0-88a846afdd5d@oss.qualcomm.com>
prerequisite-patch-id: cb558078597001d82e7291547b0eac4bd13c9d07
prerequisite-patch-id: e04ee45d80392481fcb025858f5af6352ecf1000
prerequisite-message-id: <20260716-lt9611c-v7-v7-0-7553a14735fc@oss.qualcomm.com>
prerequisite-patch-id: e9ce15b4a5842cfde130a813afecf136798179f4
prerequisite-patch-id: 2fb20282e4f0afa161797319ea7031e9f6318408
prerequisite-message-id: <20260713-shikra-dt-changes-v3-0-15102fca9570@oss.qualcomm.com>
prerequisite-patch-id: 6fa1d972a8be6b346ade96ab50d5c38b873cc028
prerequisite-patch-id: f0038f836d71e64fd5fd527906bb218115c1fbac
prerequisite-patch-id: dbccb759a76fdf39e8f7fa3f9c00d0f857f23470
prerequisite-patch-id: e15cf7dc3b1734a4eb3f468e6ba8d697f4ca92a8

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

[PATCH v2 1/2] arm64: dts: qcom: shikra-iqs-evk: Add LT9611UXD HDMI bridge support

[mohit.dsor]

From: Mohit Dsor <mdsor@oss.qualcomm.com>

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.

Signed-off-by: Mohit Dsor <mohit.dsor@oss.qualcomm.com>
---
 arch/arm64/boot/dts/qcom/shikra-iqs-evk.dts | 118 ++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/shikra-iqs-evk.dts b/arch/arm64/boot/dts/qcom/shikra-iqs-evk.dts
index 3a6962388dfd..9e602b5d4776 100644
--- a/arch/arm64/boot/dts/qcom/shikra-iqs-evk.dts
+++ b/arch/arm64/boot/dts/qcom/shikra-iqs-evk.dts
@@ -7,6 +7,8 @@
 
 #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";
@@ -21,6 +23,107 @@ aliases {
 	chosen {
 		stdout-path = "serial0:115200n8";
 	};
+
+	hdmi-connector {
+		compatible = "hdmi-connector";
+		type = "a";
+
+		port {
+			hdmi_con: endpoint {
+				remote-endpoint = <&lt9611_out>;
+			};
+		};
+	};
+
+	vreg_lt9611_vcc: regulator-lt9611-vcc {
+		compatible = "regulator-fixed";
+		regulator-name = "lt9611_vcc";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		gpio = <&pm8150_gpios 4 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+		pinctrl-0 = <&hdmi_reg_en>;
+		pinctrl-names = "default";
+	};
+
+	vreg_lt9611_vdd: regulator-lt9611-vdd {
+		compatible = "regulator-fixed";
+		regulator-name = "lt9611_vdd";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+		regulator-always-on;
+	};
+};
+
+&i2c4 {
+	status = "okay";
+
+	lt9611uxd: lt9611uxd@41 {
+		compatible = "lontium,lt9611uxd";
+		reg = <0x41>;
+		interrupts-extended = <&tlmm 85 IRQ_TYPE_EDGE_FALLING>;
+		reset-gpios = <&tlmm 76 GPIO_ACTIVE_LOW>;
+		vcc-supply = <&vreg_lt9611_vcc>;
+		vdd-supply = <&vreg_lt9611_vdd>;
+
+		pinctrl-0 = <&lt9611_irq_pin &lt9611_rst_pin>;
+		pinctrl-names = "default";
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+
+				lt9611_a: endpoint {
+					remote-endpoint = <&mdss_dsi0_out>;
+				};
+			};
+
+			port@2 {
+				reg = <2>;
+
+				lt9611_out: endpoint {
+					remote-endpoint = <&hdmi_con>;
+				};
+			};
+		};
+	};
+};
+
+&mdss {
+	status = "okay";
+};
+
+&mdss_dsi0 {
+	vdda-supply = <&pm8150_l11>;
+
+	status = "okay";
+};
+
+&mdss_dsi0_out {
+	remote-endpoint = <&lt9611_a>;
+	data-lanes = <0 1 2 3>;
+};
+
+&mdss_dsi0_phy {
+	status = "okay";
+};
+
+&pm8150_gpios {
+	hdmi_reg_en: hdmi-reg-en-state {
+		pins = "gpio4";
+		function = PMIC_GPIO_FUNC_NORMAL;
+		bias-disable;
+	};
+};
+
+&pm8150_l11 {
+	/* DSI VDDA - must be at NOM voltage for PHY PLL lock */
+	regulator-min-microvolt = <1232000>;
+	regulator-max-microvolt = <1232000>;
+	regulator-allow-set-load;
 };
 
 &remoteproc_cdsp {
@@ -64,4 +167,19 @@ &tlmm {
 			       <30 2>, /* NFC SPI */
 			       <138 1>, /* NFC Secure IO */
 			       <155 11>; /* eMMC Boot */
+
+	lt9611_irq_pin: lt9611-irq-state {
+		pins = "gpio85";
+		function = "gpio";
+		drive-strength = <2>;
+		bias-disable;
+	};
+
+	lt9611_rst_pin: lt9611-rst-state {
+		pins = "gpio76";
+		function = "gpio";
+		drive-strength = <8>;
+		bias-disable;
+	};
 };
+

-- 
2.34.1

Re: [PATCH v2 1/2] arm64: dts: qcom: shikra-iqs-evk: Add LT9611UXD HDMI bridge support

[Konrad Dybcio]

On 7/16/26 9:30 PM, mohit.dsor@oss.qualcomm.com wrote:
> From: Mohit Dsor <mdsor@oss.qualcomm.com>
> 
> 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.
> 
> Signed-off-by: Mohit Dsor <mohit.dsor@oss.qualcomm.com>
> ---

Does the other EVK not have this same hardware?

[...]

> +&pm8150_l11 {
> +	/* DSI VDDA - must be at NOM voltage for PHY PLL lock */

This comment is superfluous

Konrad

Re: [PATCH v2 1/2] arm64: dts: qcom: shikra-iqs-evk: Add LT9611UXD HDMI bridge support

[Mohit Dsor]

On Fri, Jul 17, 2026 at 11:17:10AM +0200, Konrad Dybcio wrote:
> On 7/16/26 9:30 PM, mohit.dsor@oss.qualcomm.com wrote:
> > From: Mohit Dsor <mdsor@oss.qualcomm.com>
> > 
> > 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.
> > 
> > Signed-off-by: Mohit Dsor <mohit.dsor@oss.qualcomm.com>
> > ---
> 
> Does the other EVK not have this same hardware?
Yes other variants have this hardware but only IQS variant has
DS-HDMI as default, others have DLC panel as default.
> 
> [...]
> 
> > +&pm8150_l11 {
> > +	/* DSI VDDA - must be at NOM voltage for PHY PLL lock */
> 
> This comment is superfluous
This comment will be removed in next revision.
> 
> Konrad

Re: [PATCH v2 1/2] arm64: dts: qcom: shikra-iqs-evk: Add LT9611UXD HDMI bridge support

[Dmitry Baryshkov]

On Sat, Jul 18, 2026 at 04:54:07PM +0530, Mohit Dsor wrote:
> On Fri, Jul 17, 2026 at 11:17:10AM +0200, Konrad Dybcio wrote:
> > On 7/16/26 9:30 PM, mohit.dsor@oss.qualcomm.com wrote:
> > > From: Mohit Dsor <mdsor@oss.qualcomm.com>
> > > 
> > > 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.
> > > 
> > > Signed-off-by: Mohit Dsor <mohit.dsor@oss.qualcomm.com>
> > > ---
> > 
> > Does the other EVK not have this same hardware?
> Yes other variants have this hardware but only IQS variant has
> DS-HDMI as default, others have DLC panel as default.

By 'default' do you mean some DIP switches? If so, please consider
providing overlays for the bridge to be used on other variants of the
EVK.

> > 
> > [...]
> > 
> > > +&pm8150_l11 {
> > > +	/* DSI VDDA - must be at NOM voltage for PHY PLL lock */
> > 
> > This comment is superfluous
> This comment will be removed in next revision.
> > 
> > Konrad

-- 
With best wishes
Dmitry

Re: [PATCH v2 1/2] arm64: dts: qcom: shikra-iqs-evk: Add LT9611UXD HDMI bridge support

[Mohit Dsor]

On Wed, Jul 22, 2026 at 04:49:45PM +0300, Dmitry Baryshkov wrote:
> On Sat, Jul 18, 2026 at 04:54:07PM +0530, Mohit Dsor wrote:
> > On Fri, Jul 17, 2026 at 11:17:10AM +0200, Konrad Dybcio wrote:
> > > On 7/16/26 9:30 PM, mohit.dsor@oss.qualcomm.com wrote:
> > > > From: Mohit Dsor <mdsor@oss.qualcomm.com>
> > > > 
> > > > 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.
> > > > 
> > > > Signed-off-by: Mohit Dsor <mohit.dsor@oss.qualcomm.com>
> > > > ---
> > > 
> > > Does the other EVK not have this same hardware?
> > Yes other variants have this hardware but only IQS variant has
> > DS-HDMI as default, others have DLC panel as default.
> 
> By 'default' do you mean some DIP switches? If so, please consider
> providing overlays for the bridge to be used on other variants of the
> EVK.
There are separate daughter cards for DLC Panel and DSI-HDMI, at a time
only one of them can be connected.
We are planning to submit a separate patch series covering all overlays together, if that is Ok
DLC panel overlay for the IQ variant
DSI-to-HDMI overlays for the CQ and CM variants
> 
> > > 
> > > [...]
> > > 
> > > > +&pm8150_l11 {
> > > > +	/* DSI VDDA - must be at NOM voltage for PHY PLL lock */
> > > 
> > > This comment is superfluous
> > This comment will be removed in next revision.
> > > 
> > > Konrad
> 
> -- 
> With best wishes
> Dmitry

[PATCH v2 2/2] arm64: defconfig: Enable LT9611C bridge driver

[mohit.dsor]

From: Mohit Dsor <mdsor@oss.qualcomm.com>

Enable the Lontium LT9611C DSI-to-HDMI bridge driver as a module.
This driver supports the LT9611UXD chip used on the Shikra IQS EVK
board to provide HDMI output via the MDSS DSI interface.

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 e1d8e65782d0..8a6922199545 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -965,6 +965,7 @@ 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