[PATCH v2 0/2] Subject: Add LVDS panel for rb3gen2 industrial mezzanine

[PATCH v2 0/2] Subject: Add LVDS panel for rb3gen2 industrial mezzanine

[Gopi Botlagunta]

Enables LT9211C bridge on rb3gen2 industrial mezzanine for
DSI to LVDS conversion. Add support for LVDS panel DV215FHM-R01.

Signed-off-by: Gopi Botlagunta <venkata.botlagunta@oss.qualcomm.com>
---
Changes in v2:
- Updated defconfig to load lt921l.
- Support for lt9211c LVDS by extending the existing lt9211 driver. Driver change link :
  https://lore.kernel.org/lkml/20251224-add-lt9211c-bridge-v4-0-406e73ec28c5@oss.qualcomm.com/.
- Link to v1: https://lore.kernel.org/r/20251112-add-lt9211c-bridge-for-rb3gen2-industrial-mezzanine-v1-0-6eab844ec3ac@oss.qualcomm.com

---
Gopi Botlagunta (2):
      arm64: dts: qcom: Enable lvds panel-DV215FHM-R01 for rb3gen2 industrial mezzanine
      arm64: configs: Update defconfig for DSI-LVDS bridge support

 .../qcom/qcs6490-rb3gen2-industrial-mezzanine.dtso | 106 +++++++++++++++++++++
 arch/arm64/configs/defconfig                       |   1 +
 2 files changed, 107 insertions(+)
---
base-commit: 3c3d81183061b9e49dd3207fbbbc36314744bf3f
change-id: 20251112-add-lt9211c-bridge-for-rb3gen2-industrial-mezzanine-f804dc09f072

Best regards,
-- 
Gopi Botlagunta <venkata.botlagunta@oss.qualcomm.com>

[PATCH v2 1/2] arm64: dts: qcom: Enable lvds panel-DV215FHM-R01 for rb3gen2 industrial mezzanine

[Gopi Botlagunta]

Below is the routing diagram of dsi lanes from qcs6490 soc to
mezzanine.

DSI0 --> SW1403.4 --> LT9611uxc --> hdmi port
                 |
                  --> SW2700.1 --> dsi connector
                              |
                               --> LT9211c --> LVDS connector

Disable hdmi connector for industrial mezzanine and enable
LT9211c bridge and lvds panel node.
LT9211c is powered by default with reset gpio connected to 117.

Signed-off-by: Gopi Botlagunta <venkata.botlagunta@oss.qualcomm.com>
Co-developed-by: Yi Zhang <zhanyi@qti.qualcomm.com>
Signed-off-by: Yi Zhang <zhanyi@qti.qualcomm.com>
---
 .../qcom/qcs6490-rb3gen2-industrial-mezzanine.dtso | 106 +++++++++++++++++++++
 1 file changed, 106 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2-industrial-mezzanine.dtso b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2-industrial-mezzanine.dtso
index 619a42b5ef48..cc8ee1643167 100644
--- a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2-industrial-mezzanine.dtso
+++ b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2-industrial-mezzanine.dtso
@@ -8,6 +8,112 @@
 #include <dt-bindings/clock/qcom,gcc-sc7280.h>
 #include <dt-bindings/pinctrl/qcom,pmic-gpio.h>
 
+/ {
+
+	hdmi-connector {
+		status = "disabled";
+	};
+
+	panel_lvds: panel-lvds@0 {
+		compatible = "panel-lvds";
+		data-mapping = "vesa-24";
+		width-mm = <476>;
+		height-mm = <268>;
+
+		status = "okay";
+
+		panel-timing {
+			clock-frequency = <148500000>;
+			hactive = <1920>;
+			vactive = <1080>;
+			hfront-porch = <88>;
+			hback-porch = <148>;
+			hsync-len = <44>;
+			vfront-porch = <4>;
+			vback-porch = <36>;
+			vsync-len = <5>;
+			de-active = <1>;
+		};
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+
+				dual-lvds-odd-pixels;
+				panel_in_lvds_odd: endpoint {
+					remote-endpoint = <&lt9211c_out_odd>;
+				};
+			};
+
+			port@1 {
+				reg = <1>;
+
+				dual-lvds-even-pixels;
+				panel_in_lvds_even: endpoint {
+					remote-endpoint = <&lt9211c_out_even>;
+				};
+
+			};
+		};
+	};
+
+};
+
+&i2c1 {
+	status = "okay";
+
+	lvds_bridge: lvds-bridge@29 {
+		compatible = "lontium,lt9211c";
+		reg = <0x29>;
+		reset-gpios = <&tlmm 117 1>;
+
+		status = "okay";
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+
+				lt9211c_in: endpoint {
+					data-lanes = <0 1 2 3>;
+					remote-endpoint = <&mdss_dsi0_out>;
+				};
+			};
+
+			port@2 {
+				reg = <2>;
+
+				lt9211c_out_odd: endpoint {
+					remote-endpoint = <&panel_in_lvds_odd>;
+				};
+			};
+
+			port@3 {
+				reg = <3>;
+
+				lt9211c_out_even: endpoint {
+					remote-endpoint = <&panel_in_lvds_even>;
+				};
+			};
+		};
+	};
+
+
+};
+
+&lt9611_codec {
+	status = "disabled";
+};
+
+&mdss_dsi0_out {
+	remote-endpoint = <&lt9211c_in>;
+};
+
 &spi11 {
 	#address-cells = <1>;
 	#size-cells = <0>;

-- 
2.34.1

[PATCH v2 2/2] arm64: configs: Update defconfig for DSI-LVDS bridge support

[Gopi Botlagunta]

Enable the LT9211 bridge driver to support DSI-to-LVDS conversion
on the Qualcomm RB3GEN2 Industrial Kit.

Signed-off-by: Gopi Botlagunta <venkata.botlagunta@oss.qualcomm.com>
Co-developed-by: Yi Zhang <zhanyi@qti.qualcomm.com>
Signed-off-by: Yi Zhang <zhanyi@qti.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 00d15233a72b..b8a7d299acbb 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -959,6 +959,7 @@ CONFIG_DRM_DISPLAY_CONNECTOR=m
 CONFIG_DRM_FSL_LDB=m
 CONFIG_DRM_ITE_IT6263=m
 CONFIG_DRM_LONTIUM_LT8912B=m
+CONFIG_DRM_LONTIUM_LT9211=m
 CONFIG_DRM_LONTIUM_LT9611=m
 CONFIG_DRM_LONTIUM_LT9611UXC=m
 CONFIG_DRM_ITE_IT66121=m

-- 
2.34.1

Re: [PATCH v2 2/2] arm64: configs: Update defconfig for DSI-LVDS bridge support

[Dmitry Baryshkov]

On Fri, Jan 30, 2026 at 03:57:26PM +0530, Gopi Botlagunta wrote:
> Enable the LT9211 bridge driver to support DSI-to-LVDS conversion
> on the Qualcomm RB3GEN2 Industrial Kit.
> 
> Signed-off-by: Gopi Botlagunta <venkata.botlagunta@oss.qualcomm.com>
> Co-developed-by: Yi Zhang <zhanyi@qti.qualcomm.com>
> Signed-off-by: Yi Zhang <zhanyi@qti.qualcomm.com>

Two engineers for a single line?

> ---
>  arch/arm64/configs/defconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
> index 00d15233a72b..b8a7d299acbb 100644
> --- a/arch/arm64/configs/defconfig
> +++ b/arch/arm64/configs/defconfig
> @@ -959,6 +959,7 @@ CONFIG_DRM_DISPLAY_CONNECTOR=m
>  CONFIG_DRM_FSL_LDB=m
>  CONFIG_DRM_ITE_IT6263=m
>  CONFIG_DRM_LONTIUM_LT8912B=m
> +CONFIG_DRM_LONTIUM_LT9211=m
>  CONFIG_DRM_LONTIUM_LT9611=m
>  CONFIG_DRM_LONTIUM_LT9611UXC=m
>  CONFIG_DRM_ITE_IT66121=m
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry

Re: [PATCH v2 1/2] arm64: dts: qcom: Enable lvds panel-DV215FHM-R01 for rb3gen2 industrial mezzanine

[Dmitry Baryshkov]

On Fri, Jan 30, 2026 at 03:57:25PM +0530, Gopi Botlagunta wrote:
> Below is the routing diagram of dsi lanes from qcs6490 soc to
> mezzanine.
> 
> DSI0 --> SW1403.4 --> LT9611uxc --> hdmi port
>                  |
>                   --> SW2700.1 --> dsi connector
>                               |
>                                --> LT9211c --> LVDS connector
> 
> Disable hdmi connector for industrial mezzanine and enable
> LT9211c bridge and lvds panel node.
> LT9211c is powered by default with reset gpio connected to 117.
> 
> Signed-off-by: Gopi Botlagunta <venkata.botlagunta@oss.qualcomm.com>

Your SoB should be the last one.

> Co-developed-by: Yi Zhang <zhanyi@qti.qualcomm.com>
> Signed-off-by: Yi Zhang <zhanyi@qti.qualcomm.com>
> ---
>  .../qcom/qcs6490-rb3gen2-industrial-mezzanine.dtso | 106 +++++++++++++++++++++
>  1 file changed, 106 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2-industrial-mezzanine.dtso b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2-industrial-mezzanine.dtso
> index 619a42b5ef48..cc8ee1643167 100644
> --- a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2-industrial-mezzanine.dtso
> +++ b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2-industrial-mezzanine.dtso
> @@ -8,6 +8,112 @@
>  #include <dt-bindings/clock/qcom,gcc-sc7280.h>
>  #include <dt-bindings/pinctrl/qcom,pmic-gpio.h>
>  
> +/ {
> +
> +	hdmi-connector {
> +		status = "disabled";
> +	};
> +
> +	panel_lvds: panel-lvds@0 {
> +		compatible = "panel-lvds";

This doesn't match bindings. I think it was pointed out for the previous
revision.

> +		data-mapping = "vesa-24";
> +		width-mm = <476>;
> +		height-mm = <268>;
> +
> +		status = "okay";
> +
> +		panel-timing {
> +			clock-frequency = <148500000>;
> +			hactive = <1920>;
> +			vactive = <1080>;
> +			hfront-porch = <88>;
> +			hback-porch = <148>;
> +			hsync-len = <44>;
> +			vfront-porch = <4>;
> +			vback-porch = <36>;
> +			vsync-len = <5>;
> +			de-active = <1>;
> +		};
> +
> +		ports {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +
> +			port@0 {
> +				reg = <0>;
> +
> +				dual-lvds-odd-pixels;
> +				panel_in_lvds_odd: endpoint {
> +					remote-endpoint = <&lt9211c_out_odd>;
> +				};
> +			};
> +
> +			port@1 {
> +				reg = <1>;
> +
> +				dual-lvds-even-pixels;
> +				panel_in_lvds_even: endpoint {
> +					remote-endpoint = <&lt9211c_out_even>;
> +				};
> +
> +			};
> +		};
> +	};
> +
> +};
> +
> +&i2c1 {
> +	status = "okay";
> +
> +	lvds_bridge: lvds-bridge@29 {
> +		compatible = "lontium,lt9211c";
> +		reg = <0x29>;
> +		reset-gpios = <&tlmm 117 1>;

GPIO_ACTIVE_LOW

pinctrl?

> +
> +		status = "okay";
> +
> +		ports {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +
> +			port@0 {
> +				reg = <0>;
> +
> +				lt9211c_in: endpoint {
> +					data-lanes = <0 1 2 3>;
> +					remote-endpoint = <&mdss_dsi0_out>;
> +				};
> +			};
> +
> +			port@2 {
> +				reg = <2>;
> +
> +				lt9211c_out_odd: endpoint {
> +					remote-endpoint = <&panel_in_lvds_odd>;
> +				};
> +			};
> +
> +			port@3 {
> +				reg = <3>;
> +
> +				lt9211c_out_even: endpoint {
> +					remote-endpoint = <&panel_in_lvds_even>;
> +				};
> +			};
> +		};
> +	};
> +
> +
> +};
> +
> +&lt9611_codec {
> +	status = "disabled";
> +};

Can't industrial mezz be used without the LVDS panel?
You need to create overlay for this one, adding the panel (properly
described, read the bindings) and disabling HDMI / lt9611uxc.

> +
> +&mdss_dsi0_out {
> +	remote-endpoint = <&lt9211c_in>;
> +};
> +
>  &spi11 {
>  	#address-cells = <1>;
>  	#size-cells = <0>;
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry

Re: [PATCH v2 1/2] arm64: dts: qcom: Enable lvds panel-DV215FHM-R01 for rb3gen2 industrial mezzanine

[Konrad Dybcio]

On 1/30/26 11:27 AM, Gopi Botlagunta wrote:
> Below is the routing diagram of dsi lanes from qcs6490 soc to
> mezzanine.
> 
> DSI0 --> SW1403.4 --> LT9611uxc --> hdmi port
>                  |
>                   --> SW2700.1 --> dsi connector
>                               |
>                                --> LT9211c --> LVDS connector
> 
> Disable hdmi connector for industrial mezzanine and enable
> LT9211c bridge and lvds panel node.
> LT9211c is powered by default with reset gpio connected to 117.
> 
> Signed-off-by: Gopi Botlagunta <venkata.botlagunta@oss.qualcomm.com>
> Co-developed-by: Yi Zhang <zhanyi@qti.qualcomm.com>
> Signed-off-by: Yi Zhang <zhanyi@qti.qualcomm.com>
> ---
>  .../qcom/qcs6490-rb3gen2-industrial-mezzanine.dtso | 106 +++++++++++++++++++++
>  1 file changed, 106 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2-industrial-mezzanine.dtso b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2-industrial-mezzanine.dtso
> index 619a42b5ef48..cc8ee1643167 100644
> --- a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2-industrial-mezzanine.dtso
> +++ b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2-industrial-mezzanine.dtso
> @@ -8,6 +8,112 @@
>  #include <dt-bindings/clock/qcom,gcc-sc7280.h>
>  #include <dt-bindings/pinctrl/qcom,pmic-gpio.h>
>  
> +/ {
> +
> +	hdmi-connector {

Please add a label to this node in the base dts and reference it &as_such,
the current approach is very error-prone

Konrad

Re: [PATCH v2 2/2] arm64: configs: Update defconfig for DSI-LVDS bridge support

[Krzysztof Kozlowski]

On 30/01/2026 11:27, Gopi Botlagunta wrote:
> Enable the LT9211 bridge driver to support DSI-to-LVDS conversion
> on the Qualcomm RB3GEN2 Industrial Kit.
> 
> Signed-off-by: Gopi Botlagunta <venkata.botlagunta@oss.qualcomm.com>
> Co-developed-by: Yi Zhang <zhanyi@qti.qualcomm.com>
> Signed-off-by: Yi Zhang <zhanyi@qti.qualcomm.com>

Incorrect DCO chain.


Best regards,
Krzysztof