[PATCH v3 2/2] dt-bindings: Document the Synopsys ARC HDMI TX bindings

[Eugeniy Paltsev]

This patch adds documentation of device tree bindings for the Synopsys
HDMI 2.0 TX encoder driver for ARC SoCs.

Acked-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@xxxxxxxxxxxx>
---
 .../display/bridge/snps,arc-dw-hdmi.yaml      | 136 ++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/snps,arc-dw-hdmi.yaml

diff --git a/Documentation/devicetree/bindings/display/bridge/snps,arc-dw-hdmi.yaml b/Documentation/devicetree/bindings/display/bridge/snps,arc-dw-hdmi.yaml
new file mode 100644
index 000000000000..9b2fdfecd5b3
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/bridge/snps,arc-dw-hdmi.yaml
@@ -0,0 +1,136 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/bridge/snps,arc-dw-hdmi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Synopsys DesignWare HDMI 2.0 TX encoder driver
+
+maintainers:
+  - Eugeniy Paltsev <Eugeniy.Paltsev@xxxxxxxxxxxx>
+
+description: |
+  The HDMI transmitter is a Synopsys DesignWare HDMI 2.0 TX controller IP
+  with a companion of Synopsys DesignWare HDMI 2.0 TX PHY IP.
+
+  These DT bindings follow the Synopsys DWC HDMI TX bindings defined in
+  Documentation/devicetree/bindings/display/bridge/dw_hdmi.txt
+  with the following device-specific properties.
+
+properties:
+  compatible:
+    const: snps,arc-dw-hdmi-hsdk
+
+  reg:
+    maxItems: 1
+    description: |
+      Memory mapped base address and length of the DWC HDMI TX registers.
+
+  clocks:
+    items:
+      - description: The bus clock for AHB / APB
+      - description: The internal register configuration clock
+
+  clock-names:
+    items:
+      - const: iahb
+      - const: isfr
+
+  interrupts:
+    maxItems: 1
+    description: Reference to the DWC HDMI TX interrupt
+
+  reg-io-width:
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32
+      - enum: [1, 4]
+        description: |
+          Width of the registers specified by the reg property. The
+          value is expressed in bytes and must be equal to 1 or 4 if specified.
+          The register width defaults to 1 if the property is not present.
+
+  ports:
+    type: object
+    description: |
+      A ports node with endpoint definitions as defined in
+      Documentation/devicetree/bindings/media/video-interfaces.txt
+
+    properties:
+      "#address-cells":
+        const: 1
+
+      "#size-cells":
+        const: 0
+
+      port@0:
+        type: object
+        description: |
+          Video input endpoints of the controller.
+          Usually it is associated with ARC PGU.
+
+      port@1:
+        type: object
+        description: |
+          Output endpoints of the controller. HDMI connector.
+
+    required:
+      - "#address-cells"
+      - "#size-cells"
+      - port@0
+      - port@1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - interrupts
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |
+    hdmi@10000 {
+        compatible = "snps,arc-dw-hdmi-hsdk";
+        reg = <0x10000 0x10000>;
+        reg-io-width = <4>;
+        interrupts = <14>;
+        clocks = <&apbclk>, <&hdmi_pix_clk>;
+        clock-names = "iahb", "isfr";
+
+        ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            port@0 {
+                reg = <0>;
+                hdmi_enc_input: endpoint {
+                    remote-endpoint = <&pgu_output>;
+                };
+            };
+
+            port@1 {
+                reg = <1>;
+                hdmi_enc_out: endpoint {
+                    remote-endpoint = <&hdmi_con>;
+                };
+            };
+        };
+    };
+
+    hdmi-out {
+        port {
+            hdmi_con: endpoint {
+                remote-endpoint = <&hdmi_enc_out>;
+            };
+        };
+    };
+
+    pgu {
+        port_o: port {
+            pgu_output: endpoint {
+                remote-endpoint = <&hdmi_enc_input>;
+            };
+        };
+    };
-- 
2.21.1