spi: convert Cadence SPI bindings to YAML

Convert spi for Cadence SPI bindings documentation to YAML.
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210605003811.858676-1-iwamatsu@nigauri.orgSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/spi/spi-cadence.txt

-Cadence SPI controller Device Tree Bindings
--------------------------------------------
-
-Required properties:
-- compatible		: Should be "cdns,spi-r1p6" or "xlnx,zynq-spi-r1p6".
-- reg			: Physical base address and size of SPI registers map.
-- interrupts		: Property with a value describing the interrupt
-			  number.
-- clock-names		: List of input clock names - "ref_clk", "pclk"
-			  (See clock bindings for details).
-- clocks		: Clock phandles (see clock bindings for details).
-
-Optional properties:
-- num-cs		: Number of chip selects used.
-			  If a decoder is used, this will be the number of
-			  chip selects after the decoder.
-- is-decoded-cs		: Flag to indicate whether decoder is used or not.
-
-Example:
-
-	spi@e0007000 {
-		compatible = "xlnx,zynq-spi-r1p6";
-		clock-names = "ref_clk", "pclk";
-		clocks = <&clkc 26>, <&clkc 35>;
-		interrupt-parent = <&intc>;
-		interrupts = <0 49 4>;
-		num-cs = <4>;
-		is-decoded-cs = <0>;
-		reg = <0xe0007000 0x1000>;
-	} ;

Documentation/devicetree/bindings/spi/spi-cadence.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/spi-cadence.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cadence SPI controller Device Tree Bindings
+
+maintainers:
+  - Michal Simek <michal.simek@xilinx.com>
+
+allOf:
+  - $ref: "spi-controller.yaml#"
+
+properties:
+  compatible:
+    enum:
+      - cdns,spi-r1p6
+      - xlnx,zynq-spi-r1p6
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: ref_clk
+      - const: pclk
+
+  clocks:
+    maxItems: 2
+
+  num-cs:
+    description: |
+      Number of chip selects used. If a decoder is used,
+      this will be the number of chip selects after the
+      decoder.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 1
+    maximum: 4
+    default: 4
+
+  is-decoded-cs:
+    description: |
+      Flag to indicate whether decoder is used or not.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [ 0, 1 ]
+    default: 0
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    spi@e0007000 {
+      compatible = "xlnx,zynq-spi-r1p6";
+      clock-names = "ref_clk", "pclk";
+      clocks = <&clkc 26>, <&clkc 35>;
+      interrupt-parent = <&intc>;
+      interrupts = <0 49 4>;
+      num-cs = <4>;
+      is-decoded-cs = <0>;
+      reg = <0xe0007000 0x1000>;
+    };
+...