dt-bindings: display: convert sharp,ls037v7dw01 to DT Schema

v2:
  - Add min/maxItems to mode-gpios (Rob)
  - Fix bug in description, mode is up to three gpios (Rob)
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200408195109.32692-32-sam@ravnborg.org

Documentation/devicetree/bindings/display/panel/sharp,ls037v7dw01.txt

-SHARP LS037V7DW01 TFT-LCD panel
-===================================
-
-Required properties:
-- compatible: "sharp,ls037v7dw01"
-
-Optional properties:
-- label: a symbolic name for the panel
-- enable-gpios: a GPIO spec for the optional enable pin.
-  This pin is the INI pin as specified in the LS037V7DW01.pdf file.
-- reset-gpios: a GPIO spec for the optional reset pin.
-  This pin is the RESB pin as specified in the LS037V7DW01.pdf file.
-- mode-gpios: a GPIO
-  ordered MO, LR, and UD as specified in the LS037V7DW01.pdf file.
-
-Required nodes:
-- Video port for DPI input
-
-This panel can have zero to five GPIOs to configure to change configuration
-between QVGA and VGA mode and the scan direction. As these pins can be also
-configured with external pulls, all the GPIOs are considered optional with holes
-in the array.
-
-Example
--------
-
-Example when connected to a omap2+ based device:
-
-lcd0: display {
-	compatible = "sharp,ls037v7dw01";
-	power-supply = <&lcd_3v3>;
-	enable-gpios = <&gpio5 24 GPIO_ACTIVE_HIGH>;	/* gpio152, lcd INI */
-	reset-gpios = <&gpio5 27 GPIO_ACTIVE_HIGH>;	/* gpio155, lcd RESB */
-	mode-gpios = <&gpio5 26 GPIO_ACTIVE_HIGH	/* gpio154, lcd MO */
-		      &gpio1 2 GPIO_ACTIVE_HIGH		/* gpio2, lcd LR */
-		      &gpio1 3 GPIO_ACTIVE_HIGH>;	/* gpio3, lcd UD */
-
-	port {
-		lcd_in: endpoint {
-			remote-endpoint = <&dpi_out>;
-		};
-	};
-};

Documentation/devicetree/bindings/display/panel/sharp,ls037v7dw01.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/sharp,ls037v7dw01.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SHARP LS037V7DW01 TFT-LCD panel
+
+description: |
+  This panel can have zero to five GPIOs to configure to change configuration
+  between QVGA and VGA mode and the scan direction. As these pins can be also
+  configured with external pulls, all the GPIOs are considered optional with holes
+  in the array.
+
+maintainers:
+  - Tony Lindgren <tony@atomide.com>
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    const: sharp,ls037v7dw01
+
+  label: true
+  enable-gpios: true
+  reset-gpios: true
+  port: true
+  power-supply: true
+
+  mode-gpios:
+    minItems: 1
+    maxItems: 3
+    description: |
+      GPIO ordered MO, LR, and UD as specified in LS037V7DW01.pdf
+      This panel can have zero to three GPIOs to configure to
+      change configuration between QVGA and VGA mode and the
+      scan direction. As these pins can be also configured
+      with external pulls, all the GPIOs are considered
+      optional with holes in the array.
+
+required:
+  - compatible
+  - port
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    lcd0: display {
+        compatible = "sharp,ls037v7dw01";
+        power-supply = <&lcd_3v3>;
+        enable-gpios = <&gpio5 24 GPIO_ACTIVE_HIGH>;    /* gpio152, lcd INI */
+        reset-gpios = <&gpio5 27 GPIO_ACTIVE_HIGH>;     /* gpio155, lcd RESB */
+        mode-gpios = <&gpio5 26 GPIO_ACTIVE_HIGH        /* gpio154, lcd MO */
+                      &gpio1 2 GPIO_ACTIVE_HIGH         /* gpio2, lcd LR */
+                      &gpio1 3 GPIO_ACTIVE_HIGH>;       /* gpio3, lcd UD */
+
+        port {
+            lcd_in: endpoint {
+                remote-endpoint = <&dpi_out>;
+            };
+        };
+    };
+
+...