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

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Date:   Thu, 1 Mar 2018 17:06:47 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     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@...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 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.

Yours,
Linus Walleij