[PATCH] dt-bindings: bridge: lt9211c: Add bindings

[PATCH] dt-bindings: bridge: lt9211c: Add bindings

[Nilesh Laad]

From: Yi Zhang <zhanyi@qti.qualcomm.com>

Add bindings for lt9211c.

Signed-off-by: Yi Zhang <zhanyi@qti.qualcomm.com>
Signed-off-by: Nilesh Laad <nilesh.laad@oss.qualcomm.com>
---
 .../bindings/display/bridge/lontium,lt9211c.yaml   | 113 +++++++++++++++++++++
 1 file changed, 113 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/bridge/lontium,lt9211c.yaml b/Documentation/devicetree/bindings/display/bridge/lontium,lt9211c.yaml
new file mode 100644
index 000000000000..619f718618d6
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/bridge/lontium,lt9211c.yaml
@@ -0,0 +1,113 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/bridge/lontium,lt9211c.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Lontium LT9211C DSI/LVDS/DPI to DSI/LVDS/DPI bridge.
+
+maintainers:
+  - Marek Vasut <marex@denx.de>
+
+description: |
+  The LT9211C are bridge devices which convert Single/Dual-Link DSI/LVDS
+  or Single DPI to Single/Dual-Link DSI/LVDS or Single DPI.
+
+properties:
+  compatible:
+    enum:
+      - lontium,lt9211c
+
+  reg:
+    maxItems: 1
+
+  reset-gpios:
+    maxItems: 1
+    description: GPIO connected to active high RESET pin.
+
+  vccio-supply:
+    description: Regulator for 1.8V IO power.
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/properties/port
+        description:
+          Primary MIPI DSI port-1 for MIPI input or
+          LVDS port-1 for LVDS input or DPI input.
+
+      port@1:
+        $ref: /schemas/graph.yaml#/properties/port
+        description:
+          Additional MIPI port-2 for MIPI input or LVDS port-2
+          for LVDS input. Used in combination with primary
+          port-1 to drive higher resolution displays
+
+      port@2:
+        $ref: /schemas/graph.yaml#/properties/port
+        description:
+          Primary MIPI DSI port-1 for MIPI output or
+          LVDS port-1 for LVDS output or DPI output.
+
+      port@3:
+        $ref: /schemas/graph.yaml#/properties/port
+        description:
+          Additional MIPI port-2 for MIPI output or LVDS port-2
+          for LVDS output. Used in combination with primary
+          port-1 to drive higher resolution displays.
+
+    required:
+      - port@0
+      - port@2
+
+required:
+  - compatible
+  - reg
+  - vccio-supply
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      lvds-bridge@3b {
+        compatible = "lontium,lt9211c";
+        reg = <0x3b>;
+
+        reset-gpios = <&tlmm 128 GPIO_ACTIVE_HIGH>;
+
+        vccio-supply = <&lt9211c_1v8>;
+
+        ports {
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          port@0 {
+            reg = <0>;
+
+            endpoint {
+              remote-endpoint = <&dsi0_out>;
+            };
+          };
+
+          port@2 {
+            reg = <2>;
+
+            endpoint {
+              remote-endpoint = <&panel_in_lvds>;
+            };
+          };
+        };
+      };
+    };
+
+...

---
base-commit: f50b969bafafb2810a07f376387350c4c0d72a21
change-id: 20250910-add-lt9211c-bridge-5a21fcb1c803

Best regards,
--  
Nilesh Laad <nilesh.laad@oss.qualcomm.com>

Re: [PATCH] dt-bindings: bridge: lt9211c: Add bindings

[Krzysztof Kozlowski]

On 10/09/2025 09:37, Nilesh Laad wrote:
> From: Yi Zhang <zhanyi@qti.qualcomm.com>
> 
> Add bindings for lt9211c.

Why? There is no user of it. We do not need bindings without users.

I am not reviewing the rest.

Best regards,
Krzysztof

Re: [PATCH] dt-bindings: bridge: lt9211c: Add bindings

[Marek Vasut]

On 9/10/25 9:37 AM, Nilesh Laad wrote:
> From: Yi Zhang <zhanyi@qti.qualcomm.com>
> 
> Add bindings for lt9211c.
> 
> Signed-off-by: Yi Zhang <zhanyi@qti.qualcomm.com>
> Signed-off-by: Nilesh Laad <nilesh.laad@oss.qualcomm.com>
> ---
>   .../bindings/display/bridge/lontium,lt9211c.yaml   | 113 +++++++++++++++++++++
>   1 file changed, 113 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/lontium,lt9211c.yaml b/Documentation/devicetree/bindings/display/bridge/lontium,lt9211c.yaml
Can you extend 
Documentation/devicetree/bindings/display/bridge/lontium,lt9211.yaml 
instead ?

How does this chip differ from lt9211 ?

Re: [PATCH] dt-bindings: bridge: lt9211c: Add bindings

[Dmitry Baryshkov]

On Wed, Sep 10, 2025 at 12:18:41PM +0200, Marek Vasut wrote:
> On 9/10/25 9:37 AM, Nilesh Laad wrote:
> > From: Yi Zhang <zhanyi@qti.qualcomm.com>
> > 
> > Add bindings for lt9211c.
> > 
> > Signed-off-by: Yi Zhang <zhanyi@qti.qualcomm.com>
> > Signed-off-by: Nilesh Laad <nilesh.laad@oss.qualcomm.com>
> > ---
> >   .../bindings/display/bridge/lontium,lt9211c.yaml   | 113 +++++++++++++++++++++
> >   1 file changed, 113 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/display/bridge/lontium,lt9211c.yaml b/Documentation/devicetree/bindings/display/bridge/lontium,lt9211c.yaml
> Can you extend
> Documentation/devicetree/bindings/display/bridge/lontium,lt9211.yaml instead
> ?
> 
> How does this chip differ from lt9211 ?

And more importantly, do we need a separate driver for the chip or can
it be handled by the existing one?


-- 
With best wishes
Dmitry