dt-bindings: display: bridge: Add i.MX8qm/qxp pixel combiner binding

This patch adds bindings for i.MX8qm/qxp pixel combiner.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220611141421.718743-4-victor.liu@nxp.com

Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-pixel-combiner.yaml

@@ -0,0 +1,144 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/bridge/fsl,imx8qxp-pixel-combiner.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale i.MX8qm/qxp Pixel Combiner
+
+maintainers:
+  - Liu Ying <victor.liu@nxp.com>
+
+description: |
+  The Freescale i.MX8qm/qxp Pixel Combiner takes two output streams from a
+  single display controller and manipulates the two streams to support a number
+  of modes(bypass, pixel combine, YUV444 to YUV422, split_RGB) configured as
+  either one screen, two screens, or virtual screens.  The pixel combiner is
+  also responsible for generating some of the control signals for the pixel link
+  output channel.
+
+properties:
+  compatible:
+    enum:
+      - fsl,imx8qm-pixel-combiner
+      - fsl,imx8qxp-pixel-combiner
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: apb
+
+  power-domains:
+    maxItems: 1
+
+patternProperties:
+  "^channel@[0-1]$":
+    type: object
+    description: Represents a display stream of pixel combiner.
+
+    properties:
+      "#address-cells":
+        const: 1
+
+      "#size-cells":
+        const: 0
+
+      reg:
+        description: The display stream index.
+        enum: [ 0, 1 ]
+
+      port@0:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Input endpoint of the display stream.
+
+      port@1:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Output endpoint of the display stream.
+
+    required:
+      - "#address-cells"
+      - "#size-cells"
+      - reg
+      - port@0
+      - port@1
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - "#address-cells"
+  - "#size-cells"
+  - reg
+  - clocks
+  - clock-names
+  - power-domains
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/imx8-lpcg.h>
+    #include <dt-bindings/firmware/imx/rsrc.h>
+    pixel-combiner@56020000 {
+        compatible = "fsl,imx8qxp-pixel-combiner";
+        #address-cells = <1>;
+        #size-cells = <0>;
+        reg = <0x56020000 0x10000>;
+        clocks = <&dc0_pixel_combiner_lpcg IMX_LPCG_CLK_4>;
+        clock-names = "apb";
+        power-domains = <&pd IMX_SC_R_DC_0>;
+
+        channel@0 {
+            #address-cells = <1>;
+            #size-cells = <0>;
+            reg = <0>;
+
+            port@0 {
+                reg = <0>;
+
+                dc0_pixel_combiner_ch0_dc0_dpu_disp0: endpoint {
+                    remote-endpoint = <&dc0_dpu_disp0_dc0_pixel_combiner_ch0>;
+                };
+            };
+
+            port@1 {
+                reg = <1>;
+
+                dc0_pixel_combiner_ch0_dc0_pixel_link0: endpoint {
+                    remote-endpoint = <&dc0_pixel_link0_dc0_pixel_combiner_ch0>;
+                };
+            };
+        };
+
+        channel@1 {
+            #address-cells = <1>;
+            #size-cells = <0>;
+            reg = <1>;
+
+            port@0 {
+                reg = <0>;
+
+                dc0_pixel_combiner_ch1_dc0_dpu_disp1: endpoint {
+                    remote-endpoint = <&dc0_dpu_disp1_dc0_pixel_combiner_ch1>;
+                };
+            };
+
+            port@1 {
+                reg = <1>;
+
+                dc0_pixel_combiner_ch1_dc0_pixel_link1: endpoint {
+                    remote-endpoint = <&dc0_pixel_link1_dc0_pixel_combiner_ch1>;
+                };
+            };
+        };
+    };