This is the bulk of GPIO changes for the v4.15 kernel cycle:

CORE:
- Fix the semantics of raw GPIO to actually be raw. No
  inversion semantics as before, but also no open draining,
  and allow the raw operations to affect lines used for
  interrupts as the caller supposedly knows what they are
  doing if they are getting the big hammer.

- Rewrote the __inner_function() notation calls to names that
  make more sense. I just find this kind of code disturbing.

- Drop the .irq_base() field from the gpiochip since now all
  IRQs are mapped dynamically. This is nice.

- Support for .get_multiple() in the core driver API. This
  allows us to read several GPIO lines with a single
  register read. This has high value for some usecases: it
  can be used to create oscilloscopes and signal analyzers
  and other things that rely on reading several lines at
  exactly the same instant. Also a generally nice
  optimization. This uses the new assign_bit() macro from
  the bitops lib that was ACKed by Andrew Morton and
  is implemented for two drivers, one of them being the
  generic MMIO driver so everyone using that will be able
  to benefit from this.

- Do not allow requests of Open Drain and Open Source
  setting of a GPIO line simultaneously. If the hardware
  actually supports enabling both at the same time the
  electrical result would be disastrous.

- A new interrupt chip core helper. This will be helpful
  to deal with "banked" GPIOs, which means GPIO controllers
  with several logical blocks of GPIO inside them. This
  is several gpiochips per device in the device model, in
  contrast to the case when there is a 1-to-1 relationship
  between a device and a gpiochip.

NEW DRIVERS:

- Maxim MAX3191x industrial serializer, a very interesting
  piece of professional I/O hardware.

- Uniphier GPIO driver. This is the GPIO block from the
  recent Socionext (ex Fujitsu and Panasonic) platform.

- Tegra 186 driver. This is based on the new banked GPIO
  infrastructure.

OTHER IMPROVEMENTS:

- Some documentation improvements.

- Wakeup support for the DesignWare DWAPB GPIO controller.

- Reset line support on the DesignWare DWAPB GPIO controller.

- Several non-critical bug fixes and improvements for the
  Broadcom BRCMSTB driver.

- Misc non-critical bug fixes like exotic errorpaths, removal
  of dead code etc.

- Explicit comments on fall-through switch() statements.
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gpio: tegra186: Remove tegra186_gpio_lock_class

This is no longer required after commit 959bc7b22bd2
("gpio: Automatically add lockdep keys")

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
1 file changed