[PATCH 3/6] dt-bindings: mmc: fsl-imx-esdhc: add fsl,sdio-async-interrupt-enabled binding

[Ulf Hansson]

On Mon, 16 Aug 2021 at 15:00, <haibo.chen at nxp.com> wrote:
>
> From: Haibo Chen <haibo.chen at nxp.com>
>
> Add a new fsl,sdio-async-interrupt-enabled binding for sdio devices
> which enable the async interrupt function. When get this property,
> driver will avoid to use DAT[1] for hardware auto tuning check.
>
> Signed-off-by: Haibo Chen <haibo.chen at nxp.com>
> ---
>  .../devicetree/bindings/mmc/fsl-imx-esdhc.yaml         | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml
> index b5baf439fbac..8a9f1775b0e2 100644
> --- a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml
> +++ b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml
> @@ -122,6 +122,16 @@ properties:
>        - const: state_200mhz
>        - const: sleep
>
> +  fsl,sdio-async-interrupt-enabled:
> +    description: |
> +      Recommend for SDIO cards that enables SDIO async interrupt for SDR104 and SDR50
> +      operating modes. SDIO async interrupt uses DAT[1] to signal the card's interrupt.
> +      uSDHC tuning mechanism must use DAT[0] and CMD signals to avoid a possible
> +      conflict and incorrect delay line calculated by the uSDHC auto tuning mechanism.
> +      Enabling this device tree property is only recommended for layouts that are
> +      matching the SD interface length.
> +    type: boolean

We already have a common mmc property, "cap-sdio-irq", that tells
whether the controller supports SDIO irqs (which is delivered on
DAT1).

Can't you use this instead?

> +
>  required:
>    - compatible
>    - reg
> --
> 2.17.1
>

Kind regards
Uffe