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This is the bulk of GPIO changes for the v4.9 series:

Subsystem improvements:

- Do away with the last users of the obsolete Kconfig options
  ARCH_REQUIRE_GPIOLIB and ARCH_WANT_OPTIONAL_GPIOLIB (the latter
  always sounded like an item on a wishlist to Santa Claus to
  me). We can now select GPIOLIB and be done with it, for all
  archs. After some struggle it even work on UM. Not that it has
  GPIO, but if it wants to, it can select the library.

- Continued efforts to make drivers properly either tristate or
  bool.

- Introduce a warning for drivers assigning default triggers to
  their irqchip lines when probed from device tree, so we find and
  fix these ambigous drivers. It is agreed that in the OF config
  path, the device tree defines trigger characteristics.

- The same warning, mutatis mutandis, for ACPI-probed GPIO
  irqchips.

- We introduce the ability to mark certain IRQ lines as "unusable"
  as they can be taken by BIOS/firmware, unrouted in silicon and
  generally nasty if you use them, and such things. This is
  put to good use in the STMPE driver and also in the Cherryview
  pin control driver.

- A new "mockup" virtual GPIO device that can be used for testing.
  The plan is to add unit tests under tools/* for exercising this
  device and verify that the kernel code paths are working as they
  should.

- Make memory-mapped I/O-drivers depend on HAS_IOMEM. This was
  implicit all the time, but when people started building UM
  with allyesconfig or allmodconfig it exploded in their face.

- Move some stray bits of device tree and ACPI HW description
  callbacks down into their respective implementation silo. These
  were causing issues when compiling on !HAS_IOMEM as well, so
  now eventually UM compiles the GPIOLIB library if it wants to.

New drivers:

- New driver for the Aspeed GPIO front-end companion to the
  pin controller merged through the pin control tree.

- New driver for the LP873x PMIC GPIO portions.

- New driver for Technologic Systems' I2C FPGA GPIO such as
  TS4900, TS-7970, TS-7990 and TS-4100.

- New driver for the Broadcom BCM63xx series including BCM6338
  and BCM6345.

- New driver for the Intel WhiskeyCove PMIC GPIO.

- New driver for the Allwinner AXP209 PMIC GPIO portions.

- New driver for Diamond Systems 48 line GPIO-MM, another of
  these port-mapped I/O expansion cards.

- Support the STMicroelectronics STMPE1600 variant in the STMPE
  driver.

Driver improvements:

- The STMPE driver now supports rising/falling edge detection
  properly for IRQs.

- The PCA954x will now fetch and enable its VCC regulator properly.

- Major rework of the PCA953x driver with the goal of eventually
  switching it over to use regmap and thus modernize it even more.

- Switch the IOP driver to use the generic MMIO GPIO library.

- Move the ages old HTC EGPIO (extended GPIO) GPIO expander driver
  over to this subsystem from MFD, achieveing some separation of
  concerns.

This is the 3.12.64 stable release

Linux 4.8

This is the 4.4.23 stable release

This is the 4.7.6 stable release

drm fixes for final 4.8, udl, amdgpu/radeon and nouveau

Immutable branch to move the HTC EGPIO expande from MFD to GPIO

Linux 4.8-rc8

This is the 4.7.5 stable release

This is the 4.4.22 stable release

media fixes for v4.8-rc8

Allwinner sun4i DRM fixes for 4.9

A few fixes for the sun4i drm driver that range, including some fixes that
might prevent multiple planes from working depending on the sequence where
they are enabled.

Allwinner DT changes for 4.9, late edition

Here is a bunch of late changes for the 4.9 merge window, mostly:
  - Added a bunch of touchscreens nodes to tablets
  - Added support for the AXP806 PMIC found in the A80 boards
  - Enabled a few pinmux options for the H3

wireless-drivers fixes for 4.8

iwlwifi

* fix to prevent firmware crash when sending off-channel frames

exynos and one stable ABI fix

- refactor the sseu code (Imre)
- refine guc dmesg output (Dave Gordon)
- more vgpu work
- more skl wm fixes (Lyude)
- refactor dpll code in prep for upfront link training (Jim Bride et al)
- consolidate all platform feature checks into intel_device_info (Carlos Santa)
- refactor elsp/execlist submission as prep for re-submission after hang
  recovery and eventually scheduling (Chris Wilson)
- allow synchronous gpu reset handling, to remove tricky/impossible/fragile
  error recovery code (Chris Wilson)
- prep work for nonblocking (execlist) submission, using fences to track
  depencies and drive elsp submission (Chris Wilson)
- partial error recover/resubmission of non-guilty batches after hangs (Chris Wilson)
- full dma-buf implicit fencing support (Chris Wilson)
- dp link training fixes (Jim, Dhinkaran, Navare, ...)
- obey dp branch device pixel rate/bpc/clock limits (Mika Kahola), needed for
  many vga dongles
- bunch of small cleanups and polish all over, as usual

Linux 4.8-rc7

Linux 3.18.42

Linux 4.1.33

drm fixes for 4.8-rc6

i915, vc4 and atmel.