[PATCH 4/7] dt-bindings: spi: stm32: add bindings regarding stm32h7 spi slave

[Valentin Caron <valentin.caron@foss.st.com>]

From: Alain Volmat <alain.volmat@foss.st.com>

Update the spi-stm32 binding yaml regarding to the SPI slave support.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
Signed-off-by: Valentin Caron <valentin.caron@foss.st.com>
---
 Documentation/devicetree/bindings/spi/st,stm32-spi.yaml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml b/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
index c599eb359d56..1d26fa2658c5 100644
--- a/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
+++ b/Documentation/devicetree/bindings/spi/st,stm32-spi.yaml
@@ -27,6 +27,7 @@ allOf:
     then:
       properties:
         st,spi-midi-ns: false
+        spi-slave: false
 
 properties:
   "#address-cells": true
@@ -62,6 +63,13 @@ properties:
       - const: rx
       - const: tx
 
+  cs-gpios:
+    description:
+      In case of spi-slave not defined, cs-gpios behave as defined in
+      spi-controller.yaml.
+      In case of spi-slave defined, if <0>, indicate that SS should be
+      detected via the dedicated HW pin
+
 patternProperties:
   "^[a-zA-Z][a-zA-Z0-9,+\\-._]{0,63}@[0-9a-f]+$":
     type: object
-- 
2.25.1