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

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Date:   Fri, 2 Mar 2018 09:44:46 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.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>,
        "open list:GPIO SUBSYSTEM" <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

On Fri, Mar 2, 2018 at 9:20 AM, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> On Thu, Mar 1, 2018 at 5:06 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>
>>> ---
>>> v3:
>>
>> Patch applied for v4.16 fixes.
>
> Are you aware this conflicts with commit 51750fb167a05468 ("gpio: gpio-rcar:
> Support S2RAM") in gpio/for-next?

No but I guess I will become aware.

I have not yet mixed the fixes and devel branches for next.

> You can find the resolution in
> https://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git/tree/drivers/gpio/gpio-rcar.c?h=renesas-drivers-2018-02-28-v4.16-rc3

Thanks!

Yours,
Linus Walleij