[1/2] dt-bindings: display: bridge: Add documentation for LT8912
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Message ID 20210124150835.1522899-3-adrien.grassein@gmail.com
State New, archived
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  • [1/2] dt-bindings: display: bridge: Add documentation for LT8912
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Commit Message

Adrien Grassein Jan. 24, 2021, 3:08 p.m. UTC
Lontium LT8912 is a DSI to HDMI bridge.

Signed-off-by: Adrien Grassein <adrien.grassein@gmail.com>
---
 .../display/bridge/lontium,lt8912.yaml        | 92 +++++++++++++++++++
 MAINTAINERS                                   |  5 +
 2 files changed, 97 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/lontium,lt8912.yaml

Comments

Rob Herring Feb. 9, 2021, 4:38 p.m. UTC | #1
On Sun, Jan 24, 2021 at 04:08:34PM +0100, Adrien Grassein wrote:
> Lontium LT8912 is a DSI to HDMI bridge.
> 
> Signed-off-by: Adrien Grassein <adrien.grassein@gmail.com>
> ---
>  .../display/bridge/lontium,lt8912.yaml        | 92 +++++++++++++++++++
>  MAINTAINERS                                   |  5 +
>  2 files changed, 97 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/lontium,lt8912.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/lontium,lt8912.yaml b/Documentation/devicetree/bindings/display/bridge/lontium,lt8912.yaml
> new file mode 100644
> index 000000000000..ed1a6ddaab2f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/lontium,lt8912.yaml
> @@ -0,0 +1,92 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/bridge/lontium,lt8912.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Lontium LT8912 MIPI to HDMI Bridge
> +
> +maintainers:
> +  - Adrien Grassein <adrien.grassein@gmail.com>
> +
> +description: |
> +  The LT8912 is a bridge device which convert DSI to HDMI
> +
> +properties:
> +  compatible:
> +    enum:
> +      - lontium,lt8912
> +
> +  reg:
> +    maxItems: 1
> +
> +  ddc-i2c-bus:

This belongs in an hdmi-connector node.

> +    maxItems: 1
> +    description: i2c bus used to read EDID of the connected display.
> +
> +  dsi-lanes:
> +    maxItems: 1
> +    description: dsi lanes count interconnected with lt8912.

'data-lanes' in the graph is the standard way to do this.

You'll need video-interfaces.yaml which is pending in the media tree.

> +
> +  reset-gpios:
> +    maxItems: 1
> +    description: GPIO connected to active high RESET pin.
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description:
> +          Primary MIPI port-1 for MIPI input

You're going to need a port for the connector.

> +
> +    required:
> +      - port@0
> +
> +required:
> +  - compatible
> +  - ddc-i2c-bus
> +  - dsi-lanes
> +  - reg
> +  - reset-gpios
> +  - ports
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +
> +    i2c4 {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      hdmi-bridge@48 {
> +        compatible = "lontium,lt8912";
> +        reg = <0x48>;
> +        reset-gpios = <&max7323 0 GPIO_ACTIVE_LOW>;
> +        dsi-lanes = <4>;
> +        ddc-i2c-bus = <&ddc_i2c_bus>;
> +
> +        ports {
> +          #address-cells = <1>;
> +          #size-cells = <0>;
> +
> +          port@0 {
> +            reg = <0>;
> +
> +            hdmi_out_in: endpoint {
> +              remote-endpoint = <&mipi_dsi_out>;
> +            };
> +          };
> +        };
> +      };
> +    };
> +
> +    ddc_i2c_bus: i2c5 {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +    };
> +
> +...
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 5aa18cbfb883..01e7e356bfac 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -10472,6 +10472,11 @@ S:	Maintained
>  T:	git git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git
>  F:	drivers/hid/hid-lg-g15.c
>  
> +LONTIUM LT8912 MIPI TO HDMI BRIDGE
> +M:	Adrien Grassein <adrien.grassein@gmail.com>
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/display/bridge/lontium,lt8912.yaml
> +
>  LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)
>  M:	Sathya Prakash <sathya.prakash@broadcom.com>
>  M:	Sreekanth Reddy <sreekanth.reddy@broadcom.com>
> -- 
> 2.25.1
>

Patch
diff mbox series

diff --git a/Documentation/devicetree/bindings/display/bridge/lontium,lt8912.yaml b/Documentation/devicetree/bindings/display/bridge/lontium,lt8912.yaml
new file mode 100644
index 000000000000..ed1a6ddaab2f
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/bridge/lontium,lt8912.yaml
@@ -0,0 +1,92 @@ 
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/bridge/lontium,lt8912.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Lontium LT8912 MIPI to HDMI Bridge
+
+maintainers:
+  - Adrien Grassein <adrien.grassein@gmail.com>
+
+description: |
+  The LT8912 is a bridge device which convert DSI to HDMI
+
+properties:
+  compatible:
+    enum:
+      - lontium,lt8912
+
+  reg:
+    maxItems: 1
+
+  ddc-i2c-bus:
+    maxItems: 1
+    description: i2c bus used to read EDID of the connected display.
+
+  dsi-lanes:
+    maxItems: 1
+    description: dsi lanes count interconnected with lt8912.
+
+  reset-gpios:
+    maxItems: 1
+    description: GPIO connected to active high RESET pin.
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/properties/port
+        description:
+          Primary MIPI port-1 for MIPI input
+
+    required:
+      - port@0
+
+required:
+  - compatible
+  - ddc-i2c-bus
+  - dsi-lanes
+  - reg
+  - reset-gpios
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    i2c4 {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      hdmi-bridge@48 {
+        compatible = "lontium,lt8912";
+        reg = <0x48>;
+        reset-gpios = <&max7323 0 GPIO_ACTIVE_LOW>;
+        dsi-lanes = <4>;
+        ddc-i2c-bus = <&ddc_i2c_bus>;
+
+        ports {
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          port@0 {
+            reg = <0>;
+
+            hdmi_out_in: endpoint {
+              remote-endpoint = <&mipi_dsi_out>;
+            };
+          };
+        };
+      };
+    };
+
+    ddc_i2c_bus: i2c5 {
+      #address-cells = <1>;
+      #size-cells = <0>;
+    };
+
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 5aa18cbfb883..01e7e356bfac 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10472,6 +10472,11 @@  S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git
 F:	drivers/hid/hid-lg-g15.c
 
+LONTIUM LT8912 MIPI TO HDMI BRIDGE
+M:	Adrien Grassein <adrien.grassein@gmail.com>
+S:	Maintained
+F:	Documentation/devicetree/bindings/display/bridge/lontium,lt8912.yaml
+
 LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)
 M:	Sathya Prakash <sathya.prakash@broadcom.com>
 M:	Sreekanth Reddy <sreekanth.reddy@broadcom.com>