linux-kernel - Re: [PATCH v4 3/4] gpio: brcmstb: support wakeup from S5 cold boot

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Message-ID: <CACRpkdaTwLHC528+p6ytPhR7POonECfU3_-EEz--nrs353UTXg@mail.gmail.com>
Date:	Thu, 13 Aug 2015 13:12:31 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Gregory Fong <gregory.0xf0@...il.com>
Cc:	Alexandre Courbot <gnurou@...il.com>,
	bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
	Brian Norris <computersforpeace@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Russell King <linux@....linux.org.uk>
Subject: Re: [PATCH v4 3/4] gpio: brcmstb: support wakeup from S5 cold boot

On Sat, Aug 1, 2015 at 3:17 AM, Gregory Fong <gregory.0xf0@...il.com> wrote:

> For wake from S5, we need to:
> - register a reboot handler
> - set wakeup capability before requesting IRQ so wakeup count is
>   incremented
> - mask all GPIO IRQs and clear any pending interrupts during driver
>   probe to since no driver will yet be registered to handle any IRQs
>   carried over from boot at that time, and it's possible that the
>   booted kernel does not request the same IRQ anyway.
>
> This means that /sys/.../power/wakeup_count is valid at boot time, and
> we can properly account for S5 wakeup stats. e.g.:
>
>   ### After waking from S5 from a GPIO key
>   # cat /sys/bus/platform/drivers/brcmstb-gpio/f04172c0.gpio/power/wakeup
>   enabled
>   # cat /sys/bus/platform/drivers/brcmstb-gpio/f04172c0.gpio/power/wakeup_count
>   1
>
> Signed-off-by: Gregory Fong <gregory.0xf0@...il.com>
> ---
> v4: rename __brcmstb_gpio_irq_set_wake() to brcmstb_gpio_priv_set_wake().

Patch applied.

Yours,
Linus Walleij
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