spi: xilinx: convert to yaml

Convert SPI for Xilinx bindings documentation to YAML schemas.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210605002931.858031-1-iwamatsu@nigauri.org
Signed-off-by: Mark Brown <broonie@kernel.org>

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

@@ -0,0 +1,57 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/spi-xilinx.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Xilinx SPI controller Device Tree Bindings
+
+maintainers:
+  - Michal Simek <michal.simek@xilinx.com>
+
+allOf:
+  - $ref: "spi-controller.yaml#"
+
+properties:
+  compatible:
+    enum:
+      - xlnx,xps-spi-2.00.a
+      - xlnx,xps-spi-2.00.b
+      - xlnx,axi-quad-spi-1.00.a
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  xlnx,num-ss-bits:
+    description: Number of chip selects used.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 1
+    maximum: 32
+
+  xlnx,num-transfer-bits:
+    description: Number of bits per transfer. This will be 8 if not specified.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [8, 16, 32]
+    default: 8
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    spi0: spi@41e00000 {
+      compatible = "xlnx,xps-spi-2.00.a";
+      interrupt-parent = <&intc>;
+      interrupts = <0 31 1>;
+      reg = <0x41e00000 0x10000>;
+      xlnx,num-ss-bits = <0x1>;
+      xlnx,num-transfer-bits = <32>;
+    };
+...