dt-bindings: sram: Convert Allwinner A10 system controller to a schema

The older Allwinner SoCs have a system 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>
[robh: fixup missing 'properties']
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/sram/allwinner,sun4i-a10-system-control.yaml

+# SPDX-License-Identifier: GPL-2.0+
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sram/allwinner,sun4i-a10-system-control.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Allwinner A10 System Control Device Tree Bindings
+
+maintainers:
+  - Chen-Yu Tsai <wens@csie.org>
+  - Maxime Ripard <mripard@kernel.org>
+
+description:
+  The SRAM controller found on most Allwinner devices is represented
+  by a regular node for the SRAM controller itself, with sub-nodes
+  representing the SRAM handled by the SRAM controller.
+
+properties:
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 1
+
+  compatible:
+    oneOf:
+      - const: allwinner,sun4i-a10-sram-controller
+        deprecated: true
+      - const: allwinner,sun4i-a10-system-control
+      - const: allwinner,sun5i-a13-system-control
+      - items:
+        - const: allwinner,sun7i-a20-system-control
+        - const: allwinner,sun4i-a10-system-control
+      - const: allwinner,sun8i-a23-system-control
+      - const: allwinner,sun8i-h3-system-control
+      - const: allwinner,sun50i-a64-sram-controller
+        deprecated: true
+      - const: allwinner,sun50i-a64-system-control
+      - const: allwinner,sun50i-h5-system-control
+      - items:
+        - const: allwinner,sun50i-h6-system-control
+        - const: allwinner,sun50i-a64-system-control
+      - items:
+        - const: allwinner,suniv-f1c100s-system-control
+        - const: allwinner,sun4i-a10-system-control
+
+  reg:
+    maxItems: 1
+
+  ranges: true
+
+patternProperties:
+  "^sram@[a-z0-9]+":
+    type: object
+
+    properties:
+      compatible:
+        const: mmio-sram
+
+    patternProperties:
+      "^sram-section?@[a-f0-9]+$":
+        type: object
+
+        properties:
+          compatible:
+            oneOf:
+              - const: allwinner,sun4i-a10-sram-a3-a4
+              - const: allwinner,sun4i-a10-sram-c1
+              - const: allwinner,sun4i-a10-sram-d
+              - const: allwinner,sun50i-a64-sram-c
+              - items:
+                - const: allwinner,sun5i-a13-sram-a3-a4
+                - const: allwinner,sun4i-a10-sram-a3-a4
+              - items:
+                - const: allwinner,sun7i-a20-sram-a3-a4
+                - const: allwinner,sun4i-a10-sram-a3-a4
+              - items:
+                - const: allwinner,sun5i-a13-sram-c1
+                - const: allwinner,sun4i-a10-sram-c1
+              - items:
+                - const: allwinner,sun7i-a20-sram-c1
+                - const: allwinner,sun4i-a10-sram-c1
+              - items:
+                - const: allwinner,sun8i-a23-sram-c1
+                - const: allwinner,sun4i-a10-sram-c1
+              - items:
+                - const: allwinner,sun8i-h3-sram-c1
+                - const: allwinner,sun4i-a10-sram-c1
+              - items:
+                - const: allwinner,sun50i-a64-sram-c1
+                - const: allwinner,sun4i-a10-sram-c1
+              - items:
+                - const: allwinner,sun50i-h5-sram-c1
+                - const: allwinner,sun4i-a10-sram-c1
+              - items:
+                - const: allwinner,sun50i-h6-sram-c1
+                - const: allwinner,sun4i-a10-sram-c1
+              - items:
+                - const: allwinner,sun5i-a13-sram-d
+                - const: allwinner,sun4i-a10-sram-d
+              - items:
+                - const: allwinner,sun7i-a20-sram-d
+                - const: allwinner,sun4i-a10-sram-d
+              - items:
+                - const: allwinner,suniv-f1c100s-sram-d
+                - const: allwinner,sun4i-a10-sram-d
+              - items:
+                - const: allwinner,sun50i-h6-sram-c
+                - const: allwinner,sun50i-a64-sram-c
+
+required:
+  - "#address-cells"
+  - "#size-cells"
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    system-control@1c00000 {
+      compatible = "allwinner,sun4i-a10-system-control";
+      reg = <0x01c00000 0x30>;
+      #address-cells = <1>;
+      #size-cells = <1>;
+      ranges;
+
+      sram_a: sram@00000000 {
+        compatible = "mmio-sram";
+        reg = <0x00000000 0xc000>;
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges = <0 0x00000000 0xc000>;
+
+        emac_sram: sram-section@8000 {
+          compatible = "allwinner,sun4i-a10-sram-a3-a4";
+          reg = <0x8000 0x4000>;
+        };
+      };
+    };

Documentation/devicetree/bindings/sram/sunxi-sram.txt

-Allwinnner SoC SRAM controllers
------------------------------------------------------
-
-The SRAM controller found on most Allwinner devices is represented by
-a regular node for the SRAM controller itself, with sub-nodes
-reprensenting the SRAM handled by the SRAM controller.
-
-Controller Node
----------------
-
-Required properties:
-- compatible : should be:
-    - "allwinner,sun4i-a10-sram-controller" (deprecated)
-    - "allwinner,sun4i-a10-system-control"
-    - "allwinner,sun5i-a13-system-control"
-    - "allwinner,sun7i-a20-system-control", "allwinner,sun4i-a10-system-control"
-    - "allwinner,sun8i-a23-system-control"
-    - "allwinner,sun8i-h3-system-control"
-    - "allwinner,sun50i-a64-sram-controller" (deprecated)
-    - "allwinner,sun50i-a64-system-control"
-    - "allwinner,sun50i-h5-system-control"
-    - "allwinner,sun50i-h6-system-control", "allwinner,sun50i-a64-system-control"
-    - "allwinner,suniv-f1c100s-system-control", "allwinner,sun4i-a10-system-control"
-- reg : sram controller register offset + length
-
-SRAM nodes
-----------
-
-Each SRAM is described using the mmio-sram bindings documented in
-Documentation/devicetree/bindings/sram/sram.txt
-
-Each SRAM will have SRAM sections that are going to be handled by the
-SRAM controller as subnodes. These sections are represented following
-once again the representation described in the mmio-sram binding.
-
-The valid sections compatible for A10 are:
-    - allwinner,sun4i-a10-sram-a3-a4
-    - allwinner,sun4i-a10-sram-c1
-    - allwinner,sun4i-a10-sram-d
-
-The valid sections compatible for A13 are:
-    - allwinner,sun5i-a13-sram-a3-a4, allwinner,sun4i-a10-sram-a3-a4
-    - allwinner,sun5i-a13-sram-c1, allwinner,sun4i-a10-sram-c1
-    - allwinner,sun5i-a13-sram-d, allwinner,sun4i-a10-sram-d
-
-The valid sections compatible for A20 are:
-    - allwinner,sun7i-a20-sram-a3-a4, allwinner,sun4i-a10-sram-a3-a4
-    - allwinner,sun7i-a20-sram-c1, allwinner,sun4i-a10-sram-c1
-    - allwinner,sun7i-a20-sram-d, allwinner,sun4i-a10-sram-d
-
-The valid sections compatible for A23/A33 are:
-    - allwinner,sun8i-a23-sram-c1, allwinner,sun4i-a10-sram-c1
-
-The valid sections compatible for H3 are:
-    - allwinner,sun8i-h3-sram-c1, allwinner,sun4i-a10-sram-c1
-
-The valid sections compatible for A64 are:
-    - allwinner,sun50i-a64-sram-c
-    - allwinner,sun50i-a64-sram-c1, allwinner,sun4i-a10-sram-c1
-
-The valid sections compatible for H5 are:
-    - allwinner,sun50i-h5-sram-c1, allwinner,sun4i-a10-sram-c1
-
-The valid sections compatible for H6 are:
-    - allwinner,sun50i-h6-sram-c, allwinner,sun50i-a64-sram-c
-    - allwinner,sun50i-h6-sram-c1, allwinner,sun4i-a10-sram-c1
-
-The valid sections compatible for F1C100s are:
-    - allwinner,suniv-f1c100s-sram-d, allwinner,sun4i-a10-sram-d
-
-Devices using SRAM sections
----------------------------
-
-Some devices need to request to the SRAM controller to map an SRAM for
-their exclusive use.
-
-The relationship between such a device and an SRAM section is
-expressed through the allwinner,sram property, that will take a
-phandle and an argument.
-
-This valid values for this argument are:
-  - 0: CPU
-  - 1: Device
-
-Example
--------
-system-control@1c00000 {
-	compatible = "allwinner,sun4i-a10-system-control";
-	reg = <0x01c00000 0x30>;
-	#address-cells = <1>;
-	#size-cells = <1>;
-	ranges;
-
-	sram_a: sram@00000000 {
-		compatible = "mmio-sram";
-		reg = <0x00000000 0xc000>;
-		#address-cells = <1>;
-		#size-cells = <1>;
-		ranges = <0 0x00000000 0xc000>;
-
-		emac_sram: sram-section@8000 {
-			compatible = "allwinner,sun4i-a10-sram-a3-a4";
-			reg = <0x8000 0x4000>;
-		};
-	};
-};
-
-emac: ethernet@1c0b000 {
-	compatible = "allwinner,sun4i-a10-emac";
-	...
-
-	allwinner,sram = <&emac_sram 1>;
-};