linux-kernel - Re: [PATCH v2 08/23] gpio: remove gpiod_sysfs_set_active

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Message-ID: <CACRpkdaWs7P2iBn8uUhtaPBNFfaqNcyPM6h=Wr3pmWcc8HBPfA@mail.gmail.com>
Date:	Tue, 12 May 2015 10:27:03 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Johan Hovold <johan@...nel.org>
Cc:	Alexandre Courbot <gnurou@...il.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jonathan Corbet <corbet@....net>,
	Harry Wei <harryxiyou@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	linux-kernel@...kernel.org,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
Subject: Re: [PATCH v2 08/23] gpio: remove gpiod_sysfs_set_active_low

On Mon, May 4, 2015 at 5:10 PM, Johan Hovold <johan@...nel.org> wrote:

> Remove gpiod_sysfs_set_active_low (and gpio_sysfs_set_active_low) which
> allowed code to change the polarity of a gpio line even after it had
> been exported through sysfs.
>
> Drivers should not care, and generally does not know, about gpio-line
> polarity which is a hardware feature that needs to be described by
> firmware.
>
> It is currently possible to define gpio-line polarity in device-tree and
> acpi firmware or using platform data. Userspace can also change the
> polarity through sysfs.
>
> Note that drivers using the legacy gpio interface could still use
> GPIOF_ACTIVE_LOW to change the polarity before exporting the gpio.
>
> There are no in-kernel users of this interface.
>
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Harry Wei <harryxiyou@...il.com>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: linux-doc@...r.kernel.org
> Cc: linux-kernel@...kernel.org
> Cc: linux-arch@...r.kernel.org
> Signed-off-by: Johan Hovold <johan@...nel.org>

GOOD RIDDANCE.

Patch applied.

Yours,
Linus Walleij
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