[PATCH v2] dt-bindings: trivial-devices: Document spi-cpha and spi-cpol

[Fabio Estevam <festevam@xxxxxxxxx>]

There may be cases where a trivial-device needs to describe
the SPI clock polarity and phase via spi-cpol and spi-cpha
properties.

Document these properties to fix the following dt-schema warnings:

rv1108-elgin-r1.dtb: display@0: 'spi-cpha', 'spi-cpol' do not match any of the regexes: 'pinctrl-[0-9]+'

Signed-off-by: Fabio Estevam <festevam@xxxxxxxxx>
---
Changes since v1:
- Add spi-cpha and spi-cpol to trivial-devices.yaml. (Conor)

 Documentation/devicetree/bindings/trivial-devices.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/trivial-devices.yaml b/Documentation/devicetree/bindings/trivial-devices.yaml
index 75a5fad08c44..f7c11eb6e5fd 100644
--- a/Documentation/devicetree/bindings/trivial-devices.yaml
+++ b/Documentation/devicetree/bindings/trivial-devices.yaml
@@ -24,6 +24,10 @@ properties:
   interrupts:
     maxItems: 1
 
+  spi-cpha: true
+
+  spi-cpol: true
+
   spi-max-frequency: true
 
   compatible:
-- 
2.34.1