[PATCH 4/4] spi: mt7621: Document devicetree bindings for spi bus

[Stefan Roese <sr@xxxxxxx>]

This patch documents the devicetree bindings for the MT7621 SPI device
driver.

Signed-off-by: Stefan Roese <sr@xxxxxxx>
Cc: Rob Herring <robh@xxxxxxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: NeilBrown <neil@xxxxxxxxxx>
Cc: Sankalp Negi <sankalpnegi2310@xxxxxxxxx>
Cc: Chuanhong Guo <gch981213@xxxxxxxxx>
Cc: John Crispin <john@xxxxxxxxxxx>
---
 .../devicetree/bindings/spi/spi-mt7621.txt    | 26 +++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/spi-mt7621.txt

diff --git a/Documentation/devicetree/bindings/spi/spi-mt7621.txt b/Documentation/devicetree/bindings/spi/spi-mt7621.txt
new file mode 100644
index 000000000000..d5baec0fa56e
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-mt7621.txt
@@ -0,0 +1,26 @@
+Binding for MTK SPI controller (MT7621 MIPS)
+
+Required properties:
+- compatible: Should be one of the following:
+  - "ralink,mt7621-spi": for mt7621/mt7628/mt7688 platforms
+- #address-cells: should be 1.
+- #size-cells: should be 0.
+- reg: Address and length of the register set for the device
+- resets: phandle to the reset controller asserting this device in
+          reset
+  See ../reset/reset.txt for details.
+
+Optional properties:
+- cs-gpios: see spi-bus.txt.
+
+Example:
+
+- SoC Specific Portion:
+spi0: spi@b00 {
+	compatible = "ralink,mt7621-spi";
+	reg = <0xb00 0x100>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+	resets = <&rstctrl 18>;
+	reset-names = "spi";
+};
-- 
2.20.1