12 Oct, 2015

1 commit

• 0ea1563bc   Typo correction for description in gpio document. ... Browse Code »

  Corrected Documentation/gpio/sysfs.txt for typos and wording.
  typos: syfs -> sysfs, manges -> manages
  wording: entry -> entries

  Signed-off-by: Sachin Pandhare
  Signed-off-by: Jonathan Corbet

  Sachin Pandhare

  2015-10-12 05:39:01 +0800  

21 Jul, 2015

1 commit

• c21cde6fe   gpio: document interaction with other subsystems ... Browse Code »

  Now I am very fed up with people reinventing kernel wheels in
  userspace "just because they can" (read, sysfs). Put in a angry
  blurb in sysfs doc and put in a new file with pointers to other
  subsystem drivers utilizing GPIOs.

  Signed-off-by: Linus Walleij

  Linus Walleij

  2015-07-21 17:39:32 +0800  

12 May, 2015

1 commit

• 166a85e44   gpio: remove gpiod_sysfs_set_active_low ... Browse Code »

  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
  Cc: Harry Wei
  Cc: Arnd Bergmann
  Cc: linux-doc@vger.kernel.org
  Cc: linux-kernel@zh-kernel.org
  Cc: linux-arch@vger.kernel.org
  Signed-off-by: Johan Hovold
  Reviewed-by: Alexandre Courbot
  Signed-off-by: Linus Walleij

  Johan Hovold

  2015-05-12 16:46:53 +0800  

25 Nov, 2013

1 commit

• fd8e198cf   Documentation: gpiolib: document new interface ... Browse Code »

  gpiolib now exports a new descriptor-based interface which deprecates
  the older integer-based one. This patch documents this new interface and
  also takes the opportunity to brush-up the GPIO documentation a little
  bit.

  The new descriptor-based interface follows the same consumer/driver
  model as many other kernel subsystems (e.g. clock, regulator), so its
  documentation has similarly been splitted into different files.

  The content of the former documentation has been reused whenever it
  made sense; however, some of its content did not apply to the new
  interface anymore and have this been removed. Likewise, new sections
  like the mapping of GPIOs to devices have been written from scratch.

  The deprecated legacy-based documentation is still available, untouched,
  under Documentation/gpio/gpio-legacy.txt.

  Signed-off-by: Alexandre Courbot
  Signed-off-by: Linus Walleij

  Alexandre Courbot

  2013-11-25 16:02:30 +0800