[PATCH v8 1/3] dt-bindings: mmc: mtk-sd: extend interrupts and pinctrls properties

[Rob Herring]

On Mon, Mar 21, 2022 at 07:51:32PM +0800, Axe Yang wrote:
> Extend interrupts and pinctrls for SDIO wakeup interrupt feature.
> This feature allow SDIO devices alarm asynchronous interrupt to host
> even when host stop providing clock to SDIO card. An extra wakeup
> interrupt and pinctrl states for SDIO DAT1 pin state switching are
> required in this scenario.
> 
> Signed-off-by: Axe Yang <axe.yang at mediatek.com>
> ---
>  .../devicetree/bindings/mmc/mtk-sd.yaml       | 23 ++++++++++++++++++-
>  1 file changed, 22 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/mtk-sd.yaml b/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
> index 297ada03e3de..f57774535a1d 100644
> --- a/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
> +++ b/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
> @@ -69,12 +69,23 @@ properties:
>        - const: ahb_cg
>  
>    interrupts:
> -    maxItems: 1
> +    description:
> +      Should at least contain MSDC GIC interrupt. To support SDIO in-band wakeup, an extended
> +      interrupt is required and be configured as wakeup source irq.
> +    minItems: 1
> +    maxItems: 2
>  
>    pinctrl-names:
> +    description:
> +      Should at least contain default and state_uhs. To support SDIO in-band wakeup, dat1 pin
> +      will be switched between GPIO mode and SDIO DAT1 mode, state_eint and state_dat1 are
> +      mandatory in this scenarios.
> +    minItems: 2
>      items:
>        - const: default
>        - const: state_uhs
> +      - const: state_eint
> +      - const: state_dat1
>  
>    pinctrl-0:
>      description:
> @@ -86,6 +97,16 @@ properties:
>        should contain uhs mode pin ctrl.
>      maxItems: 1
>  
> +  pinctrl-2:
> +    description:
> +      should switch dat1 pin to GPIO mode.
> +    maxItems: 1
> +
> +  pinctrl-3:
> +    description:
> +      should switch SDIO dat1 pin from GPIO mode back to SDIO mode.

How is this different than pinctrl-0?

> +    maxItems: 1
> +
>    assigned-clocks:
>      description:
>        PLL of the source clock.
> -- 
> 2.25.1
> 
>