[PATCH 3/4] dt-bindings: display: imx: add binding for i.MX8MP HDMI PAI

[Shengjiu Wang]

Add binding for the i.MX8MP HDMI parallel Audio interface block.
As this port is linked to imx8mp-hdmi-tx, add port at 2 in
fsl,imx8mp-hdmi-tx.yaml document.

Signed-off-by: Shengjiu Wang <shengjiu.wang at nxp.com>
---
 .../display/bridge/fsl,imx8mp-hdmi-tx.yaml    | 13 ++++
 .../display/imx/fsl,imx8mp-hdmi-pai.yaml      | 61 +++++++++++++++++++
 2 files changed, 74 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8mp-hdmi-pai.yaml

diff --git a/Documentation/devicetree/bindings/display/bridge/fsl,imx8mp-hdmi-tx.yaml b/Documentation/devicetree/bindings/display/bridge/fsl,imx8mp-hdmi-tx.yaml
index 05442d437755..cf810b277557 100644
--- a/Documentation/devicetree/bindings/display/bridge/fsl,imx8mp-hdmi-tx.yaml
+++ b/Documentation/devicetree/bindings/display/bridge/fsl,imx8mp-hdmi-tx.yaml
@@ -49,9 +49,14 @@ properties:
         $ref: /schemas/graph.yaml#/properties/port
         description: HDMI output port
 
+      port at 2:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Parallel audio input port
+
     required:
       - port at 0
       - port at 1
+      - port at 2
 
 required:
   - compatible
@@ -98,5 +103,13 @@ examples:
                     remote-endpoint = <&hdmi0_con>;
                 };
             };
+
+            port at 2 {
+                reg = <2>;
+
+                endpoint {
+                    remote-endpoint = <&pai_to_hdmi_tx>;
+                };
+            };
         };
     };
diff --git a/Documentation/devicetree/bindings/display/imx/fsl,imx8mp-hdmi-pai.yaml b/Documentation/devicetree/bindings/display/imx/fsl,imx8mp-hdmi-pai.yaml
new file mode 100644
index 000000000000..d2d723935032
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/imx/fsl,imx8mp-hdmi-pai.yaml
@@ -0,0 +1,61 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/imx/fsl,imx8mp-hdmi-pai.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale i.MX8MP HDMI Parallel Audio Interface
+
+maintainers:
+  - Shengjiu Wang <shengjiu.wang at nxp.com>
+
+description:
+  The HDMI TX Parallel Audio Interface (HTX_PAI) is a digital module that acts as the
+  bridge between the Audio Subsystem to the HDMI TX Controller.
+
+properties:
+  compatible:
+    const: fsl,imx8mp-hdmi-pai
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+
+  port:
+    $ref: /schemas/graph.yaml#/properties/port
+    description: Output to the HDMI TX controller.
+    unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - power-domains
+  - port
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/power/imx8mp-power.h>
+
+    hdmi at 32fc4800 {
+        compatible = "fsl,imx8mp-hdmi-pai";
+        reg = <0x32fc4800 0x800>;
+        interrupt-parent = <&irqsteer_hdmi>;
+        interrupts = <14>;
+        power-domains = <&hdmi_blk_ctrl IMX8MP_HDMIBLK_PD_PAI>;
+
+        port {
+
+            pai_to_hdmi_tx: endpoint {
+                remote-endpoint = <&hdmi_tx_from_pai>;
+            };
+        };
+    };
-- 
2.34.1