linux-kernel - Re: [PATCH v2 4/6] gpio: brcmstb: Allow GPIOs to be wakeup sources

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Message-ID: <CACRpkdYnZ9nYHPoUsmgLUtKhB2Us0c_scAYsZVJJQK2orKcpVA@mail.gmail.com>
Date:	Tue, 2 Jun 2015 15:45:01 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Gregory Fong <gregory.0xf0@...il.com>
Cc:	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	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-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 v2 4/6] gpio: brcmstb: Allow GPIOs to be wakeup sources

On Fri, May 29, 2015 at 4:14 AM, Gregory Fong <gregory.0xf0@...il.com> wrote:

> Several drivers (e.g. gpio-keys) allow for GPIOs to be configured as
> wakeup sources, and this GPIO controller supports that through a
> separate interrupt path.
>
> The de-facto standard DT property "wakeup-source" is checked, since
> that indicates whether the GPIO controller hardware can wake.  Uses
> the IRQCHIP_MASK_ON_SUSPEND irq_chip flag because UPG GIO doesn't have
> any of its own wakeup source configuration.
>
> Signed-off-by: Gregory Fong <gregory.0xf0@...il.com>

(...)
> +       if (enable)
> +               enable_irq_wake(priv->parent_wake_irq);
> +       else
> +               disable_irq_wake(priv->parent_wake_irq);
> +       return 0;

No error handling? If the code assumes these calls will
always succeed, atleast write that in a comment.

Yours,
Linus Walleij
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