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> |
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arm | ||
arm64 | ||
filesystems | ||
video4linux | ||
CodingStyle | ||
HOWTO | ||
IRQ.txt | ||
SecurityBugs | ||
SubmittingDrivers | ||
SubmittingPatches | ||
basic_profiling.txt | ||
email-clients.txt | ||
gpio.txt | ||
io_ordering.txt | ||
magic-number.txt | ||
oops-tracing.txt | ||
sparse.txt | ||
stable_api_nonsense.txt | ||
stable_kernel_rules.txt | ||
volatile-considered-harmful.txt |