On Fri, Jul 31, 2026 at 09:08:25AM +0000, Xianwei Zhao via B4 Relay wrote:
> From: Xianwei Zhao <xianwei.zhao@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" property, which configure the MOSI idle output
> level.

> +  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

This looks like the standard SPI_MOSI_IDLE_{LOW,HIGH} we have in the
kernel, plus one new option.  Usually the client driver would control
this.  Why do something different here?