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This is the bulk of GPIO changes for the v4.20 series:

Core changes:

- A patch series from Hans Verkuil to make it possible to
  enable/disable IRQs on a GPIO line at runtime and drive GPIO
  lines as output without having to put/get them from scratch.
  The irqchip callbacks have been improved so that they can
  use only the fastpatch callbacks to enable/disable irqs
  like any normal irqchip, especially the gpiod_lock_as_irq()
  has been improved to be callable in fastpath context.
  A bunch of rework had to be done to achieve this but it is
  a big win since I never liked to restrict this to slowpath.
  The only call requireing slowpath was try_module_get() and
  this is kept at the .request_resources() slowpath callback.
  In the GPIO CEC driver this is a big win sine a single
  line is used for both outgoing and incoming traffic, and
  this needs to use IRQs for incoming traffic while actively
  driving the line for outgoing traffic.

- Janusz Krzysztofik improved the GPIO array API to pass a
  "cookie" (struct gpio_array) and a bitmap for setting or
  getting multiple GPIO lines at once. This improvement
  orginated in a specific need to speed up an OMAP1 driver and
  has led to a much better API and real performance gains
  when the state of the array can be used to bypass a lot
  of checks and code when we want things to go really fast.
  The previous code would minimize the number of calls
  down to the driver callbacks assuming the CPU speed was
  orders of magnitude faster than the I/O latency, but this
  assumption was wrong on several platforms: what we needed
  to do was to profile and improve the speed on the hot
  path of the array functions and this change is now
  completed.

- Clean out the painful and hard to grasp BNF experiments
  from the device tree bindings. Future approaches are looking
  into using JSON schema for this purpose. (Rob Herring
  is floating a patch series.)

New drivers:

- The RCAR driver now supports r8a774a1 (RZ/G2M).

- Synopsys GPIO via CREGs driver.

Major improvements:

- Modernization of the EP93xx driver to use irqdomain and
  other contemporary concepts.

- The ingenic driver has been merged into the Ingenic pin
  control driver and removed from the GPIO subsystem.

- Debounce support in the ftgpio010 driver.

regulator: Regulator updates for next release

The biggest chunk of the regulator changes for this release outside of
the new drivers is the conversion of the fixed regulator to use the GPIO
descriptor API, there's a small addition to the GPIO API plus a bunch of
updates to board files to implement it.  This is some really welcome
work from Linus Walleij that's had a bunch of review and has been
sitting in -next for a while so I'm fairly happy there's no major
issues.

 - Helpers for overlapping linear ranges.
 - Display opmode and consumer requested load in the regualtor_summary
   file in debugfs, plus a fix there.
 - Support for the fun and entertaining power off mechanism that the
   pfuze100 hardware implements.
 - Conversion of the fixed regulator API to use GPIO descriptors,
   including pulling in a bunch of patches to a bunch of board files.
 - New drivers for Cirrus Logic Lochnagar, Qualcomm PMS405, Rohm
   BD71847, ST PMIC1, and TI LM363x devices.

ASoC: Updates for v5.0/v4.20

As ever there's a lot of small and driver specific changes going on
here, but we do also have some relatively large changes in the core
thanks to the hard work of Charles and Morimoto-san:

 - More component transitions from Morimoto-san, I think we're about
   finished with this.  Thanks for all the hard work!
 - Morimoto-san also added a bunch of for_each_foo macros
 - A bunch of cleanups and fixes for DAPM from Charles.
 - MCLK support for several different devices, including CS42L51, STM32
   SAI, and MAX98373.
 - Support for Allwinner A64 CODEC analog, Intel boards with DA7219 and
   MAX98927, Meson AXG PDM inputs, Nuvoton NAU8822, Renesas R8A7744 and
   TI PCM3060.

This is the 4.19 release

This is the 3.16.60 stable release

This is the 4.4.162 stable release

This is the 4.9.135 stable release

This is the 4.14.78 stable release

This is the 4.18.16 stable release

ACPI updates for 4.20-rc1

 - Fix ACPICA issues related to the handling of module-level AML
   and make the ACPI initialization code parse ECDT before loading
   the definition block tables (Erik Schmauss).

 - Update ACPICA to upstream revision 20181003 including fixes
   related to the ill-defined "generic serial bus" and the handling
   of the _REG object (Bob Moore).

 - Fix some issues with system-wide suspend/resume on Intel BYT/CHT
   related to the handling of I2C controllers in the ACPI LPSS driver
   for Intel SoCs (Hans de Goede).

 - Modify the ACPI namespace scanning code to enumerate INT33FE HID
   devices as platform devices with I2C resources to avoid device
   enumeration problems on boards with Dollar Cove or Whiskey Cove
   Intel PMICs (Hans de Goede).

 - Prevent ACPICA from using ktime_get() during early resume from
   system-wide suspend before resuming the timekeeping which generally
   is unsafe and triggers a warning from the timekeeping code (Bart
   Van Assche).

 - Add low-level real time clock support to the ACPI Time and Aalarm
   Device (TAD) driver (Rafael Wysocki).

 - Fix the ACPI SBS driver to avoid GPE storms on MacBook Pro and
   Oopses when removing modules (Ronald Tschalär).

 - Fix the ACPI PPTT parsing code to handle architecturally unknown
   cache types properly (Jeffrey Hugo).

 - Fix initialization issue in the ACPI processor driver (Dou Liyang).

 - Clean up the code in several places (Andy Shevchenko, Bartlomiej
   Zolnierkiewicz, David Arcari, zhong jiang).

Power management updates for 4.20-rc1

 - Backport hibernation bug fixes from x86-64 to x86-32 and
   consolidate hibernation handling on x86 to allow 32-bit
   systems to work in all of the cases in which 64-bit ones
   work (Zhimin Gu, Chen Yu).

 - Fix hibernation documentation (Vladimir D. Seleznev).

 - Update the menu cpuidle governor to fix a couple of issues
   with it, make it more efficient in some cases and clean it
   up (Rafael Wysocki).

 - Rework the cpuidle polling state implementation to make it
   more efficient (Rafael Wysocki).

 - Clean up the cpuidle core somewhat (Fieah Lim).

 - Fix the cpufreq conservative governor to take policy limits
   into account properly in some cases (Rafael Wysocki).

 - Add support for retrieving guaranteed performance information
   to the ACPI CPPC library and make the intel_pstate driver use
   it to expose the CPU base frequency via sysfs on systems with
   the hardware-managed P-states (HWP) feature enabled (Srinivas
   Pandruvada).

 - Fix clang warning in the CPPC cpufreq driver (Nathan Chancellor).

 - Get rid of device_node.name printing from cpufreq (Rob Herring).

 - Remove unnecessary unlikely() from the cpufreq core (Igor Stoppa).

 - Add support for the r8a7744 SoC to the cpufreq-dt driver (Biju Das).

 - Update the dt-platdev cpufreq driver to allow RK3399 to have
   separate tunables per cluster (Dmitry Torokhov).

 - Fix the dma_alloc_coherent() usage in the tegra186 cpufreq driver
   (Christoph Hellwig).

 - Make the imx6q cpufreq driver read OCOTP through nvmem for
   imx6ul/imx6ull (Anson Huang).

 - Fix several bugs in the operating performance points (OPP)
   framework and make it more stable (Viresh Kumar, Dave Gerlach).

 - Update the devfreq subsystem to take changes in the APIs used
   by into account, fix some issues with it and make it stop
   print device_node.name directly (Bjorn Andersson, Enric Balletbo
   i Serra, Matthias Kaehlcke, Rob Herring, Vincent Donnefort, zhong
   jiang).

 - Prepare the generic power domains (genpd) framework for dealing
   with domains containing CPUs (Ulf Hansson).

 - Prevent sysfs attributes representing low-power S0 residency
   counters from being exposed if low-power S0 support is not
   indicated in ACPI FADT (Rajneesh Bhardwaj).

 - Get rid of custom CPU features macros for Intel CPUs from the
   intel_idle and RAPL drivers (Andy Shevchenko).

 - Update the tasks freezer to list tasks that refused to freeze
   and caused a system transition to a sleep state to be aborted
   (Todd Brandt).

 - Update the pm-graph set of tools to v5.2 (Todd Brandt).

 - Fix some issues in the cpupower utility (Anders Roxell, Prarit
   Bhargava).

This is the 4.18.15 stable release

This is the 4.14.77 stable release

This is the 4.9.134 stable release

This is the 4.19-rc8 release

wireless-drivers-next patches for 4.20

Third set of patches for 4.20. Most notable is finalising ath10k
wcn3990 support, all components should be implemented now.

Major changes:

ath10k

* support NET_DETECT WoWLAN feature

* wcn3990 basic functionality now working after we got QMI support

mt76

* mt76x0e improvements (should be usable now)

* more mt76x0/mt76x2 unification work

brcmsmac

* fix a problem on AP mode with clients using power save mode

iwlwifi

* support for a new scan type: fast balance

This is the 4.18.14 stable release

This is the 4.14.76 stable release

This is the 4.9.133 stable release

This is the 4.4.161 stable release