linux-kernel - Re: [PATCH] gpio: mxc: add power management support

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Message-ID: <CACRpkdaKQ_Lg=t3DLsvXQNLwi=BYugqNGyssEM9Hn2Ss5r-kQw@mail.gmail.com>
Date:   Fri, 13 Jul 2018 09:11:58 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Anson Huang <Anson.Huang@....com>,
        Fabio Estevam <fabio.estevam@....com>,
        Bartosz Golaszewski <brgl@...ev.pl>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        NXP Linux Team <Linux-imx@....com>
Subject: Re: [PATCH] gpio: mxc: add power management support

On Tue, Jul 10, 2018 at 9:53 AM Anson Huang <Anson.Huang@....com> wrote:

> GPIO registers could lose context on some i.MX SoCs,
> like on i.MX7D, when enter LPSR mode, the whole SoC
> will be powered off except LPSR domain, GPIO banks
> will lose context in this case, need to restore
> the context after resume from LPSR mode.
>
> This patch adds GPIO save/restore for those necessary
> registers, and put the save/restore operations in noirq
> suspend/resume phase, since GPIO is fundamental module
> which could be used by other peripherals' resume phase.
>
> Signed-off-by: Anson Huang <Anson.Huang@....com>

Hoping for some review on this before applying...
Fabio? Bartosz?

Yours,
Linus Walleij