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

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Message-ID: <YjkKURNzg8JPbXcg@robh.at.kernel.org>
Date:   Mon, 21 Mar 2022 18:29:21 -0500
From:   Rob Herring <robh@...nel.org>
To:     Axe Yang <axe.yang@...iatek.com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Chaotian Jing <chaotian.jing@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Satya Tangirala <satyat@...gle.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Lucas Stach <dev@...xeye.de>,
        Eric Biggers <ebiggers@...gle.com>,
        Andrew Jeffery <andrew@...id.au>,
        Stephen Boyd <swboyd@...omium.org>,
        Kiwoong Kim <kwmad.kim@...sung.com>,
        Yue Hu <huyue2@...ong.com>, Tian Tao <tiantao6@...ilicon.com>,
        angelogioacchino.delregno@...labora.com, linux-mmc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v8 1/3] dt-bindings: mmc: mtk-sd: extend interrupts and
 pinctrls properties

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@...iatek.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
> 
>