[PATCH 1/3] spi: dt-bindings: amlogic: spisg: Document A9-specific properties

[Xianwei Zhao via B4 Relay]

From: Xianwei Zhao <xianwei.zhao at amlogic.com>

Document the Amlogic A9 SPISG controller and its additional
Device Tree properties.

Add the "amlogic,a9-spisg" compatible string and define the
A9-specific "amlogic,mo-idle-output" and "amlogic,word-gap"
properties, which configure the MOSI idle output level and
the inter-word gap, respectively.

Signed-off-by: Xianwei Zhao <xianwei.zhao at amlogic.com>
---
 .../devicetree/bindings/spi/amlogic,a4-spisg.yaml  | 36 +++++++++++++++++++---
 1 file changed, 32 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/spi/amlogic,a4-spisg.yaml b/Documentation/devicetree/bindings/spi/amlogic,a4-spisg.yaml
index 9bfb8089f7ea..7efdc748d566 100644
--- a/Documentation/devicetree/bindings/spi/amlogic,a4-spisg.yaml
+++ b/Documentation/devicetree/bindings/spi/amlogic,a4-spisg.yaml
@@ -11,12 +11,11 @@ maintainers:
   - Xianwei Zhao <xianwei.zhao at amlogic.com>
   - Sunny Luo <sunny.luo at amlogic.com>
 
-allOf:
-  - $ref: spi-controller.yaml#
-
 properties:
   compatible:
-    const: amlogic,a4-spisg
+    enum:
+      - amlogic,a4-spisg
+      - amlogic,a9-spisg
 
   reg:
     maxItems: 1
@@ -42,6 +41,35 @@ required:
   - clocks
   - clock-names
 
+allOf:
+  - $ref: spi-controller.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - amlogic,a9-spisg
+    then:
+      properties:
+        amlogic,mo-idle-output:
+          description: |
+            Controls the MOSI output level when the controller is idle.
+
+            0 - Drive MOSI low
+            1 - Drive MOSI high
+            2 - Follow the last transmitted bit
+          $ref: /schemas/types.yaml#/definitions/uint32
+          enum: [0, 1, 2]
+          default: 0
+
+        amlogic,word-gap:
+          description: |
+            Number of idle clock cycles inserted between consecutive SPI
+            words.
+          $ref: /schemas/types.yaml#/definitions/uint32
+          enum: [0, 1, 2, 3]
+          default: 1
+
 unevaluatedProperties: false
 
 examples:

-- 
2.52.0