dt-bindings: display: dw_mipi_dsi.txt: convert to yaml

This converts the Synopsis MIPI DSI binding documentation to yaml and
should be quite straightforward. I've added a missing ref clk and also
added Philippe as maintainer b/c he's the original txt author following
the algorithm provided in Message-ID 20200420175909.GA5810@ravnborg.org.

Cc: Philippe CORNU <philippe.cornu@st.com>
Cc: devicetree@vger.kernel.org
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200423100058.1734009-1-adrian.ratiu@collabora.com

Documentation/devicetree/bindings/display/bridge/dw_mipi_dsi.txt

-Synopsys DesignWare MIPI DSI host controller
-============================================
-
-This document defines device tree properties for the Synopsys DesignWare MIPI
-DSI host controller. It doesn't constitue a device tree binding specification
-by itself but is meant to be referenced by platform-specific device tree
-bindings.
-
-When referenced from platform device tree bindings the properties defined in
-this document are defined as follows. The platform device tree bindings are
-responsible for defining whether each optional property is used or not.
-
-- reg: Memory mapped base address and length of the DesignWare MIPI DSI
-  host controller registers. (mandatory)
-
-- clocks: References to all the clocks specified in the clock-names property
-  as specified in [1]. (mandatory)
-
-- clock-names:
-  - "pclk" is the peripheral clock for either AHB and APB. (mandatory)
-  - "px_clk" is the pixel clock for the DPI/RGB input. (optional)
-
-- resets: References to all the resets specified in the reset-names property
-  as specified in [2]. (optional)
-
-- reset-names: string reset name, must be "apb" if used. (optional)
-
-- panel or bridge node: see [3]. (mandatory)
-
-[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
-[2] Documentation/devicetree/bindings/reset/reset.txt
-[3] Documentation/devicetree/bindings/display/mipi-dsi-bus.txt

Documentation/devicetree/bindings/display/bridge/snps,dw-mipi-dsi.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/bridge/snps,dw-mipi-dsi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Synopsys DesignWare MIPI DSI host controller
+
+maintainers:
+  - Philippe CORNU <philippe.cornu@st.com>
+
+description: |
+  This document defines device tree properties for the Synopsys DesignWare MIPI
+  DSI host controller. It doesn't constitue a device tree binding specification
+  by itself but is meant to be referenced by platform-specific device tree
+  bindings.
+
+  When referenced from platform device tree bindings the properties defined in
+  this document are defined as follows. The platform device tree bindings are
+  responsible for defining whether each property is required or optional.
+
+allOf:
+  - $ref: ../dsi-controller.yaml#
+
+properties:
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: Module clock
+      - description: DSI bus clock for either AHB and APB
+      - description: Pixel clock for the DPI/RGB input
+    minItems: 2
+
+  clock-names:
+    items:
+      - const: ref
+      - const: pclk
+      - const: px_clk
+    minItems: 2
+
+  resets:
+    maxItems: 1
+
+  reset-names:
+    const: apb
+
+  ports:
+    type: object
+
+    properties:
+      port@0:
+        type: object
+        description: Input node to receive pixel data.
+      port@1:
+        type: object
+        description: DSI output node to panel.
+
+    required:
+      - port@0
+      - port@1
+
+required:
+  - clock-names
+  - clocks
+  - ports
+  - reg