Convert SPI for Xilinx bindings documentation to YAML schemas.

Signed-off-by: Nobuhiro Iwamatsu <redacted>
---
 .../devicetree/bindings/spi/spi-xilinx.txt    | 23 ---------
 .../devicetree/bindings/spi/spi-xilinx.yaml   | 51 +++++++++++++++++++
 2 files changed, 51 insertions(+), 23 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/spi/spi-xilinx.txt
 create mode 100644 Documentation/devicetree/bindings/spi/spi-xilinx.yaml

diff --git a/Documentation/devicetree/bindings/spi/spi-xilinx.txt b/Documentation/devicetree/bindings/spi/spi-xilinx.txt
deleted file mode 100644
index 5f4ed3e5c9942c..00000000000000
--- a/Documentation/devicetree/bindings/spi/spi-xilinx.txt
+++ /dev/null

@@ -1,23 +0,0 @@
-Xilinx SPI controller Device Tree Bindings
--------------------------------------------------
-
-Required properties:
-- compatible		: Should be "xlnx,xps-spi-2.00.a", "xlnx,xps-spi-2.00.b" or "xlnx,axi-quad-spi-1.00.a"
-- reg			: Physical base address and size of SPI registers map.
-- interrupts		: Property with a value describing the interrupt
-			  number.
-
-Optional properties:
-- xlnx,num-ss-bits	 : Number of chip selects used.
-- xlnx,num-transfer-bits : Number of bits per transfer. This will be 8 if not specified
-
-Example:
-	axi_quad_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>;
-	};
-

diff --git a/Documentation/devicetree/bindings/spi/spi-xilinx.yaml b/Documentation/devicetree/bindings/spi/spi-xilinx.yaml
new file mode 100644
index 00000000000000..17463151b36a02
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-xilinx.yaml

@@ -0,0 +1,51 @@
+# 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:
+    oneOf:
+      - const: xlnx,xps-spi-2.00.a
+      - const: xlnx,xps-spi-2.00.b
+      - const: xlnx,axi-quad-spi-1.00.a