[PATCH 1/2] dt-bindings: mmc: amlogic,meson-gx-mmc: add amlogic,core-phase-degrees

[Krzysztof Kozlowski]

On Sun, Oct 25, 2026 at 08:20:58PM +0100, christian.koever-draxl at student.uibk.ac.at wrote:
> From: Christian Stefan Kövér-Draxl <ckoever at outlook.de>
> 
> The controller samples with a core clock phase that is fixed at 180
> degrees in the driver. Some boards need another phase to work at high
> speed: an SD slot on an S905W2 TV box fails with CRC errors at 50 MHz
> at 180 degrees but works reliably at 270 degrees, which is also what
> the vendor kernel programs for it.
> 
> Add an optional property to describe the phase.
> 
> Signed-off-by: Christian Stefan Kövér-Draxl <ckoever at outlook.de>
> ---
>  .../devicetree/bindings/mmc/amlogic,meson-gx-mmc.yaml    | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/amlogic,meson-gx-mmc.yaml b/Documentation/devicetree/bindings/mmc/amlogic,meson-gx-mmc.yaml
> index 976f36de2091..8123375a66e0 100644
> --- a/Documentation/devicetree/bindings/mmc/amlogic,meson-gx-mmc.yaml
> +++ b/Documentation/devicetree/bindings/mmc/amlogic,meson-gx-mmc.yaml
> @@ -58,6 +58,15 @@ properties:
>    power-domains:
>      maxItems: 1
>  
> +  amlogic,core-phase-degrees:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      Phase of the controller core clock relative to the card clock. Some
> +      boards only sample reliably at high speed with a phase other than
> +      the default.
> +    enum: [0, 90, 180, 270]
> +    default: 180

Is this the same as clk-phase- properties from mmc schema?

Best regards,
Krzysztof