Commit Graph

4 Commits

Author SHA1 Message Date
Johan Hovold 166a85e442 gpio: remove gpiod_sysfs_set_active_low
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@lwn.net>
Cc: Harry Wei <harryxiyou@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@zh-kernel.org
Cc: linux-arch@vger.kernel.org
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2015-05-12 10:46:53 +02:00
Chen Baozi f4c5405064 gpio: update gpio Chinese documentation
Since the GENERIC_GPIO has been removed and the documentation of it
has been modified, this patch updates the corresponding documentation of
gpio in Chinese.

Signed-off-by: Chen Baozi <baozich@gmail.com>
Acked-by: Alexandre Courbot <acourbot@nvidia.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
2013-04-16 18:47:22 +09:00
Tekkaman Ninja 1980a347a7 Documentation: Fixes some translation error in Documentation/zh_CN/gpio.txt
Fixes some translation error in Documentation/zh_CN/gpio.txt
The modification is based on Dong Aisheng <b29396@freescale.com>'s
corrections:
    1.Two "OUTPUT" is incorrectly translated as "输入";
    2.five improvement of translation;
    3.Delete a redundant paragraph,

Signed-off-by: Fu Wei <tekkamanninja@gmail.com>
Acked-by: Harry Wei <harryxiyou@gmail.com>
Acked-by: Dong Aisheng <b29396@freescale.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-09-26 13:12:32 -07:00
Ninja Tekkaman 6e2187bf59 Chinese translation of Documentation/gpio.txt
This is a Chinese translated version of Documentation/gpio.txt

Signed-off-by: Fu Wei <tekkamanninja@gmail.com>
Acked-by: Harry Wei <harryxiyou@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-09-04 16:04:59 -07:00