linux-kernel - Re: [PATCH v13 3/3] mmc: mediatek: add support for SDIO eint wakup IRQ

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Date:   Fri, 15 Jul 2022 10:38:51 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Axe Yang <axe.yang@...iatek.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Chaotian Jing <chaotian.jing@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Cc:     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>,
        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,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        Yong Mao <yong.mao@...iatek.com>
Subject: Re: [PATCH v13 3/3] mmc: mediatek: add support for SDIO eint wakup
 IRQ

Il 23/06/22 11:04, Axe Yang ha scritto:
> Add support for eint IRQ when MSDC is used as an SDIO host. This
> feature requires SDIO device support async IRQ function. With this
> feature, SDIO host can be awakened by SDIO card in suspend state,
> without additional pin.
> 
> MSDC driver will time-share the SDIO DAT1 pin. During suspend, MSDC
> turn off clock and switch SDIO DAT1 pin to GPIO mode. And during
> resume, switch GPIO function back to DAT1 mode then turn on clock.
> 
> Some device tree property should be added or modified in MSDC node
> to support SDIO eint IRQ. Pinctrls "state_eint" is mandatory. Since
> this feature depends on asynchronous interrupts, "wakeup-source",
> "keep-power-in-suspend" and "cap-sdio-irq" flags are necessary, and
> the interrupts list should be extended(the interrupt named with
> sdio_wakeup):
>          &mmcX {
> 		...
> 		interrupt-names = "msdc", "sdio_wakeup";
> 		interrupts-extended = <...>,
>                                	      <&pio xxx IRQ_TYPE_LEVEL_LOW>;
>                  ...
>                  pinctrl-names = "default", "state_uhs", "state_eint";
>                  ...
>                  pinctrl-2 = <&mmc2_pins_eint>;
>                  ...
>                  cap-sdio-irq;
> 		keep-power-in-suspend;
> 		wakeup-source;
>                  ...
>          };
> 
> Co-developed-by: Yong Mao <yong.mao@...iatek.com>
> Signed-off-by: Yong Mao <yong.mao@...iatek.com>
> Signed-off-by: Axe Yang <axe.yang@...iatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>