linux-kernel - Re: [PATCH v3 3/3] gpio: rcar: Use wakeup

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Message-ID: <CAMuHMdXXvwREAZwaeb6heN296OJKOugzR9oD9_M4x6dBc7A69g@mail.gmail.com>
Date:   Thu, 22 Feb 2018 15:44:37 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-gpio@...r.kernel.org,
        Linux PM list <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH v3 3/3] gpio: rcar: Use wakeup_path i.s.o. explicit clock handling

Hi Linus,

On Thu, Feb 22, 2018 at 3:23 PM, Linus Walleij <linus.walleij@...aro.org> wrote:
> On Mon, Feb 12, 2018 at 2:55 PM, Geert Uytterhoeven
> <geert+renesas@...der.be> wrote:
>
>> Since commit ab82fa7da4dce5c7 ("gpio: rcar: Prevent module clock disable
>> when wake-up is enabled"), when a GPIO is used for wakeup, the GPIO
>> block's module clock (if exists) is manually kept running during system
>> suspend, to make sure the device stays active.
>>
>> However, this explicit clock handling is merely a workaround for a
>> failure to properly communicate wakeup information to the device core.
>>
>> Instead, set the device's power.wakeup_path field, to indicate this
>> device is part of the wakeup path.  Depending on the PM Domain's
>> active_wakeup configuration, the genpd core code will keep the device
>> enabled (and the clock running) during system suspend when needed.
>> This allows for the removal of all explicit clock handling code from the
>> driver.
>>
>> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
>
> Acked-by: Linus Walleij <linus.walleij@...aro.org>
>
> Can I apply this and only this patch to GPIO?

Yes please.

> Should it be applied for fixes, next?

No, as it depends on infrastructure (device_set_wakeup_path()) and fixes
(various "Keep wakeup sources active during system suspend") in v4.16-rc1.

Thanks!

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds