dt-bindings: ufs: cdns,ufshc: convert to dtschema

Convert the Cadence Universal Flash Storage (UFS) Controlle to DT schema
format.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220306111125.116455-4-krzysztof.kozlowski@canonical.com

Documentation/devicetree/bindings/ufs/cdns,ufshc.txt

@@ -1,32 +0,0 @@
-* Cadence Universal Flash Storage (UFS) Controller
-
-UFS nodes are defined to describe on-chip UFS host controllers.
-Each UFS controller instance should have its own node.
-Please see the ufshcd-pltfrm.txt for a list of all available properties.
-
-Required properties:
-- compatible	: Compatible list, contains one of the following controllers:
-			"cdns,ufshc" - Generic CDNS HCI,
-			"cdns,ufshc-m31-16nm" - CDNS UFS HC + M31 16nm PHY
-		  complemented with the JEDEC version:
-			"jedec,ufs-2.0"
-
-- reg		: Address and length of the UFS register set.
-- interrupts	: One interrupt mapping.
-- freq-table-hz	: Clock frequency table.
-		  See the ufshcd-pltfrm.txt for details.
-- clocks	: List of phandle and clock specifier pairs.
-- clock-names	: List of clock input name strings sorted in the same
-		  order as the clocks property. "core_clk" is mandatory.
-		  Depending on a type of a PHY,
-		  the "phy_clk" clock can also be added, if needed.
-
-Example:
-	ufs@fd030000 {
-		compatible = "cdns,ufshc", "jedec,ufs-2.0";
-		reg = <0xfd030000 0x10000>;
-		interrupts = <0 1 IRQ_TYPE_LEVEL_HIGH>;
-		freq-table-hz = <0 0>, <0 0>;
-		clocks = <&ufs_core_clk>, <&ufs_phy_clk>;
-		clock-names = "core_clk", "phy_clk";
-	};

Documentation/devicetree/bindings/ufs/cdns,ufshc.yaml

@@ -0,0 +1,68 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/ufs/cdns,ufshc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cadence Universal Flash Storage (UFS) Controller
+
+maintainers:
+  - Jan Kotas <jank@cadence.com>
+
+# Select only our matches, not all jedec,ufs-2.0
+select:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - cdns,ufshc
+          - cdns,ufshc-m31-16nm
+  required:
+    - compatible
+
+allOf:
+  - $ref: ufs-common.yaml
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - cdns,ufshc
+            # CDNS UFS HC + M31 16nm PHY
+          - cdns,ufshc-m31-16nm
+      - const: jedec,ufs-2.0
+
+  clocks:
+    minItems: 1
+    maxItems: 3
+
+  clock-names:
+    minItems: 1
+    items:
+      - const: core_clk
+      - const: phy_clk
+      - const: ref_clk
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - clocks
+  - clock-names
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    ufs@fd030000 {
+        compatible = "cdns,ufshc", "jedec,ufs-2.0";
+        reg = <0xfd030000 0x10000>;
+        interrupts = <GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>;
+        freq-table-hz = <0 0>, <0 0>;
+        clocks = <&ufs_core_clk>, <&ufs_phy_clk>;
+        clock-names = "core_clk", "phy_clk";
+    };

Documentation/devicetree/bindings/ufs/ti,j721e-ufs.yaml

@@ -47,11 +47,10 @@ required:
 
 patternProperties:
   "^ufs@[0-9a-f]+$":
-    type: object
+    $ref: cdns,ufshc.yaml
     description: |
-      Cadence UFS controller node must be the child node. Refer
-      Documentation/devicetree/bindings/ufs/cdns,ufshc.txt for binding
-      documentation of child node
+      Cadence UFS controller node must be the child node.
+    unevaluatedProperties: false
 
 additionalProperties: false