linux-kernel - Re: [PATCH v5] pinctrl: mediatek: add EINT support to virtual GPIOs

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Date:   Fri, 4 Jan 2019 02:26:46 -0800
From:   Sean Wang <sean.wang@...nel.org>
To:     Chuanjia Liu (柳传嘉) 
        <chuanjia.liu@...iatek.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-mediatek@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        youlin.pei@...iatek.com,
        Eddie Huang (黃智傑) 
        <eddie.huang@...iatek.com>, Zhiyong Tao <zhiyong.tao@...iatek.com>,
        hailong.fan@...iatek.com
Subject: Re: [PATCH v5] pinctrl: mediatek: add EINT support to virtual GPIOs

On Wed, Jan 2, 2019 at 7:38 PM <chuanjia.liu@...iatek.com> wrote:
>
> From: "chuanjia.liu" <Chuanjia.Liu@...iatek.com>
>
> Virtual gpio only used inside SOC and not being exported to outside SOC.
> Some modules use virtual gpio as eint and doesn't need SMT.
> So this patch add EINT support to virtual GPIOs.
>
> Signed-off-by: chuanjia.liu <Chuanjia.Liu@...iatek.com>

Acked-by: Sean Wang <sean.wang@...nel.org>

BTW, if you were worried about a patch is lost, you could use RESEND
in the tag is fine.

> ---
> change note:
> v5: This patch is the same as v4,re-upload due to
>       mail permissions issues
> ---
>  drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> index 4a9e0d4c2bbc..b1c368455d30 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
> @@ -290,7 +290,13 @@ static int mtk_xt_set_gpio_as_eint(void *data, unsigned long eint_n)
>                 return err;
>
>         err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT, MTK_ENABLE);
> -       if (err)
> +       /* SMT is supposed to be supported by every real GPIO and doesn't
> +        * support virtual GPIOs, so the extra condition err != -ENOTSUPP
> +        * is just for adding EINT support to these virtual GPIOs. It should
> +        * add an extra flag in the pin descriptor when more pins with
> +        * distinctive characteristic come out.
> +        */
> +       if (err && err != -ENOTSUPP)
>                 return err;
>
>         return 0;
> --
> 2.19.1
>