[PATCH 1/2] spi: dt-bindings: spi-peripheral-props: Document spi-cpha and spi-cpol

[Fabio Estevam <festevam@gmail.com>]

The 'spi-cpha' and 'spi-cpol' are commonly used SPI peripheral
properties that indicate the device clock phase and polarity.

Document these properties.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
---
 .../devicetree/bindings/spi/spi-peripheral-props.yaml  | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml b/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
index 0bb443b8decd..b2e2717f3619 100644
--- a/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
+++ b/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml
@@ -29,6 +29,16 @@ properties:
     description:
       Chip select used by the device.
 
+  spi-cpha:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      The device data is sampled on trailing (last) edge of the SPI clock.
+
+  spi-cpol:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      The device clock has a falling lead (first) edge.
+
   spi-cs-high:
     $ref: /schemas/types.yaml#/definitions/flag
     description:
-- 
2.34.1