[PATCH 1/3] spi: dt-bindings: amlogic: spisg: Document A9-specific properties
From: Xianwei Zhao via B4 Relay
Date: Fri Jul 17 2026 - 03:51:57 EST
From: Xianwei Zhao <xianwei.zhao@xxxxxxxxxxx>
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@xxxxxxxxxxx>
---
.../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@xxxxxxxxxxx>
- Sunny Luo <sunny.luo@xxxxxxxxxxx>
-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