spi: dt-bindings: add nxp,lpc3220-spi.yaml

Add lpc3220 spi controller binding doc to fix below CHECK_DTBS warning:
  arch/arm/boot/dts/nxp/lpc/lpc3250-ea3250.dtb: /ahb/apb/spi@20088000: failed to match any schema with compatible: ['nxp,lpc3220-spi']

Signed-off-by: Frank Li <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: nxpfrankli

Documentation/devicetree/bindings/spi/nxp,lpc3220-spi.yaml

@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/nxp,lpc3220-spi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP LPC3220 SPI controller
+
+maintainers:
+  - Frank Li <[email protected]>
+
+properties:
+  compatible:
+    enum:
+      - nxp,lpc3220-spi
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+allOf:
+  - $ref: spi-controller.yaml#
+
+unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+examples:
+  - |
+    #include <dt-bindings/clock/lpc32xx-clock.h>
+
+    spi@20088000 {
+        compatible = "nxp,lpc3220-spi";
+        reg = <0x20088000 0x1000>;
+        clocks = <&clk LPC32XX_CLK_SPI1>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+    };
+