dt-bindings: media: Convert Allwinner A31 CSI to a schema

The newer Allwinner SoCs have a camera controller that is supported in
Linux, with a matching Device Tree binding.

Now that we have the DT validation in place, let's convert the device tree
bindings for that controller over to a YAML schemas.
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/media/allwinner,sun6i-a31-csi.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/allwinner,sun6i-a31-csi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Allwinner A31 CMOS Sensor Interface (CSI) Device Tree Bindings
+
+maintainers:
+  - Chen-Yu Tsai <wens@csie.org>
+  - Maxime Ripard <mripard@kernel.org>
+
+properties:
+  compatible:
+    enum:
+      - allwinner,sun6i-a31-csi
+      - allwinner,sun8i-a83t-csi
+      - allwinner,sun8i-h3-csi
+      - allwinner,sun8i-v3s-csi
+      - allwinner,sun50i-a64-csi
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: Bus Clock
+      - description: Module Clock
+      - description: DRAM Clock
+
+  clock-names:
+    items:
+      - const: bus
+      - const: mod
+      - const: ram
+
+  resets:
+    maxItems: 1
+
+  # See ./video-interfaces.txt for details
+  port:
+    type: object
+
+    properties:
+      endpoint:
+        type: object
+
+        properties:
+          remote-endpoint: true
+
+          bus-width:
+            enum: [ 8, 10, 12, 16 ]
+
+          pclk-sample: true
+          hsync-active: true
+          vsync-active: true
+
+        required:
+          - bus-width
+          - remote-endpoint
+
+    required:
+      - endpoint
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+  - resets
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/sun8i-v3s-ccu.h>
+    #include <dt-bindings/reset/sun8i-v3s-ccu.h>
+
+    csi1: csi@1cb4000 {
+        compatible = "allwinner,sun8i-v3s-csi";
+        reg = <0x01cb4000 0x1000>;
+        interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&ccu CLK_BUS_CSI>,
+                 <&ccu CLK_CSI1_SCLK>,
+                 <&ccu CLK_DRAM_CSI>;
+        clock-names = "bus",
+                      "mod",
+                      "ram";
+        resets = <&ccu RST_BUS_CSI>;
+
+        port {
+            /* Parallel bus endpoint */
+            csi1_ep: endpoint {
+                remote-endpoint = <&adv7611_ep>;
+                bus-width = <16>;
+
+                /*
+                 * If hsync-active/vsync-active are missing,
+                 * embedded BT.656 sync is used.
+                 */
+                 hsync-active = <0>; /* Active low */
+                 vsync-active = <0>; /* Active low */
+                 pclk-sample = <1>;  /* Rising */
+            };
+        };
+    };
+
+...

Documentation/devicetree/bindings/media/sun6i-csi.txt

-Allwinner V3s Camera Sensor Interface
--------------------------------------
-
-Allwinner V3s SoC features a CSI module(CSI1) with parallel interface.
-
-Required properties:
-  - compatible: value must be one of:
-    * "allwinner,sun6i-a31-csi"
-    * "allwinner,sun8i-a83t-csi"
-    * "allwinner,sun8i-h3-csi"
-    * "allwinner,sun8i-v3s-csi"
-    * "allwinner,sun50i-a64-csi"
-  - reg: base address and size of the memory-mapped region.
-  - interrupts: interrupt associated to this IP
-  - clocks: phandles to the clocks feeding the CSI
-    * bus: the CSI interface clock
-    * mod: the CSI module clock
-    * ram: the CSI DRAM clock
-  - clock-names: the clock names mentioned above
-  - resets: phandles to the reset line driving the CSI
-
-The CSI node should contain one 'port' child node with one child 'endpoint'
-node, according to the bindings defined in
-Documentation/devicetree/bindings/media/video-interfaces.txt.
-
-Endpoint node properties for CSI
----------------------------------
-See the video-interfaces.txt for a detailed description of these properties.
-- remote-endpoint	: (required) a phandle to the bus receiver's endpoint
-			   node
-- bus-width:		: (required) must be 8, 10, 12 or 16
-- pclk-sample		: (optional) (default: sample on falling edge)
-- hsync-active		: (required; parallel-only)
-- vsync-active		: (required; parallel-only)
-
-Example:
-
-csi1: csi@1cb4000 {
-	compatible = "allwinner,sun8i-v3s-csi";
-	reg = <0x01cb4000 0x1000>;
-	interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
-	clocks = <&ccu CLK_BUS_CSI>,
-		 <&ccu CLK_CSI1_SCLK>,
-		 <&ccu CLK_DRAM_CSI>;
-	clock-names = "bus", "mod", "ram";
-	resets = <&ccu RST_BUS_CSI>;
-
-	port {
-		/* Parallel bus endpoint */
-		csi1_ep: endpoint {
-			remote-endpoint = <&adv7611_ep>;
-			bus-width = <16>;
-
-			/* If hsync-active/vsync-active are missing,
-			   embedded BT.656 sync is used */
-			hsync-active = <0>; /* Active low */
-			vsync-active = <0>; /* Active low */
-			pclk-sample = <1>;  /* Rising */
-		};
-	};
-};