linux-kernel - Re: [PATCH 1/4] pinctrl: baytrail: Relax GPIO request rules

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Message-ID: <CACRpkdYiC6cgkQ3x4TrZiuisF+nKu-xtwXLnJfy8Ev-g-gaR_Q@mail.gmail.com>
Date:	Fri, 6 Mar 2015 12:20:19 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Hans Holmberg <hans.holmberg@...el.com>,
	Benjamin Adler <benadler@....net>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] pinctrl: baytrail: Relax GPIO request rules

On Mon, Feb 23, 2015 at 1:53 PM, Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:

> Zotac ZBOX PI320, a Baytrail based mini-PC, has power button connected to a
> GPIO pin and it is exposed to the operating system as Windows 8 button
> array. This is implemented in Linux as a driver using gpio_keys.
>
> However, BIOS on this particula machine forgot to mux the pin to be a GPIO
> instead of native function, which results following message to be seen on
> the console:
>
>  byt_gpio INT33FC:02: pin 16 cannot be used as GPIO.
>
> This causes power button to not work as the driver was not able to request
> the GPIO it needs.
>
> So instead of completely preventing this we allow turning the pin as GPIO
> but issue warning that something might be wrong.
>
> Reported-by: Benjamin Adler <benadler@....net>
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>

Patch applied for fixes.

Yours,
Linus Walleij
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