dt-bindings: display: convert sharp,lq101r1sx01 to DT Schema

This binding describes a panel with a secondary channel.

v3:
  - Add reg property and unit-address to dsi nodes (Rob)

v2:
  - add check for required properties if link2 is present (Rob)
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200704102806.735713-4-sam@ravnborg.org

Documentation/devicetree/bindings/display/panel/sharp,lq101r1sx01.txt

-Sharp Microelectronics 10.1" WQXGA TFT LCD panel
-
-This panel requires a dual-channel DSI host to operate. It supports two modes:
-- left-right: each channel drives the left or right half of the screen
-- even-odd: each channel drives the even or odd lines of the screen
-
-Each of the DSI channels controls a separate DSI peripheral. The peripheral
-driven by the first link (DSI-LINK1), left or even, is considered the primary
-peripheral and controls the device. The 'link2' property contains a phandle
-to the peripheral driven by the second link (DSI-LINK2, right or odd).
-
-Note that in video mode the DSI-LINK1 interface always provides the left/even
-pixels and DSI-LINK2 always provides the right/odd pixels. In command mode it
-is possible to program either link to drive the left/even or right/odd pixels
-but for the sake of consistency this binding assumes that the same assignment
-is chosen as for video mode.
-
-Required properties:
-- compatible: should be "sharp,lq101r1sx01"
-- reg: DSI virtual channel of the peripheral
-
-Required properties (for DSI-LINK1 only):
-- link2: phandle to the DSI peripheral on the secondary link. Note that the
-  presence of this property marks the containing node as DSI-LINK1.
-- power-supply: phandle of the regulator that provides the supply voltage
-
-Optional properties (for DSI-LINK1 only):
-- backlight: phandle of the backlight device attached to the panel
-
-Example:
-
-	dsi@54300000 {
-		panel: panel@0 {
-			compatible = "sharp,lq101r1sx01";
-			reg = <0>;
-
-			link2 = <&secondary>;
-
-			power-supply = <...>;
-			backlight = <...>;
-		};
-	};
-
-	dsi@54400000 {
-		secondary: panel@0 {
-			compatible = "sharp,lq101r1sx01";
-			reg = <0>;
-		};
-	};

Documentation/devicetree/bindings/display/panel/sharp,lq101r1sx01.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/sharp,lq101r1sx01.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sharp Microelectronics 10.1" WQXGA TFT LCD panel
+
+maintainers:
+  - Thierry Reding <treding@nvidia.com>
+
+description: |
+  This panel requires a dual-channel DSI host to operate. It supports two modes:
+  - left-right: each channel drives the left or right half of the screen
+  - even-odd: each channel drives the even or odd lines of the screen
+
+  Each of the DSI channels controls a separate DSI peripheral. The peripheral
+  driven by the first link (DSI-LINK1), left or even, is considered the primary
+  peripheral and controls the device. The 'link2' property contains a phandle
+  to the peripheral driven by the second link (DSI-LINK2, right or odd).
+
+  Note that in video mode the DSI-LINK1 interface always provides the left/even
+  pixels and DSI-LINK2 always provides the right/odd pixels. In command mode it
+  is possible to program either link to drive the left/even or right/odd pixels
+  but for the sake of consistency this binding assumes that the same assignment
+  is chosen as for video mode.
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    const: sharp,lq101r1sx01
+
+  reg: true
+  power-supply: true
+  backlight: true
+
+  link2:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: |
+      phandle to the DSI peripheral on the secondary link. Note that the
+      presence of this property marks the containing node as DSI-LINK1
+
+required:
+  - compatible
+  - reg
+
+if:
+  required:
+    - link2
+then:
+  required:
+    - power-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    dsi0: dsi@fd922800 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        reg = <0xfd922800 0x200>;
+
+        panel: panel@0 {
+            compatible = "sharp,lq101r1sx01";
+            reg = <0>;
+
+            link2 = <&secondary>;
+
+            power-supply = <&power>;
+            backlight = <&backlight>;
+        };
+    };
+
+    dsi1: dsi@fd922a00 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        reg = <0xfd922a00 0x200>;
+
+        secondary: panel@0 {
+            compatible = "sharp,lq101r1sx01";
+            reg = <0>;
+        };
+    };
+
+...