diff options
| author | Johan Hovold <johan@kernel.org> | 2015-05-04 18:10:33 +0300 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2015-05-12 11:46:53 +0300 |
| commit | 166a85e44245d771bd7042f3ad72aa0e12bb53bd (patch) | |
| tree | a9fd0409715c50ff15d2314b2314b4358c754ffb /arch/parisc/include | |
| parent | 426577bd8846d67b735b3a4e8926ef00abb15297 (diff) | |
| download | linux-166a85e44245d771bd7042f3ad72aa0e12bb53bd.tar.xz | |
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>
Diffstat (limited to 'arch/parisc/include')
0 files changed, 0 insertions, 0 deletions