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sound fixes for 4.21-rc1 (or whatever the next)

Among a few HD-audio fixes, the only significant one is the
regression fix on some machines like Dell XPS due to the default
binding changes.  We ended up reverting the whole since the fix for
ASoC HD-audio driver won't be available immediately.

Device properties framework fixes for 4.21-rc1

Fix two potential NULL pointer dereferences found by Coverity in
the software nodes code introduced recently (Colin Ian King).

Make some drm headers self-contained with includes and forward declarations

This is the 4.9.148 stable release

This is the 4.14.91 stable release

This is the 4.19.13 stable release

Devicetree updates for v4.21:

- Initial support for DT bindings using json-schema language. This is
  the start of converting DT bindings from free-form text to a
  structured format.

- Reworking of initrd address initialization. This moves to using the
  phys address instead of virt addr in the DT parsing code. This rework
  was motivated by CONFIG_DEV_BLK_INITRD causing unnecessary rebuilding
  of lots of files.

- Fix stale phandle entries in phandle cache

- DT overlay validation improvements. This exposed several memory leak
  bugs which have been fixed.

- Use node name and device_type helper functions in DT code

- Last remaining conversions to using %pOFn printk specifier instead of
  device_node.name directly

- Create new common RTC binding doc and move all trivial RTC devices out
  of trivial-devices.txt.

- New bindings for Freescale MAG3110 magnetometer, Cadence Sierra PHY,
  and Xen shared memory

- Update dtc to upstream version v1.4.7-57-gf267e674d145

This is the bulk of GPIO changes for the v4.21 kernel series:

Core changes:

- Some core changes are already in outside of this pull
  request as they came through the regulator tree, most
  notably devm_gpiod_unhinge() that removes devres refcount
  management from a GPIO descriptor. This is needed in
  subsystems such as regulators where the regulator core
  need to take over the reference counting and lifecycle
  management for a GPIO descriptor.

- We dropped devm_gpiochip_remove() and devm_gpio_chip_match()
  as nothing needs it. We can bring it back if need be.

- Add a global TODO so people see where we are going. This
  helps setting the direction now that we are two GPIO
  maintainers.

- Handle the MMC CD/WP properties in the device tree core.
  (The bulk of patches activating this code is already
  merged through the MMC/SD tree.)

- Augment gpiochip_request_own_desc() to pass a flag so
  we as gpiochips can request lines as active low or open
  drain etc even from ourselves.

New drivers:

- New driver for Cadence GPIO blocks.

- New driver for Atmel SAMA5D2 PIOBU GPIO lines.

Driver improvements:

- A major refactoring of the PCA953x driver - this driver has
  been around for ages, and is now modernized to reduce code
  duplication that has stacked up and is using regmap to read
  write and cache registers.

- Intel drivers are now maintained in a separate tree and
  start with a round of cleanups and unifications.

regulator: Updates for v4.20

This has been a very busy release for the core, some fixes, one large new
feature and a big bit of refactoring to update the GPIO API:

 - Support for coupled regulators from Dmitry Osipenko based on a prior
   attempt by Maciej Purski, allowing us to handle situations where the
   voltages on two regulators can't be too far apart from each other.
 - Conversion of the GPIO support in both drivers and the core to use
   GPIO descriptors rather than numbers, part of the overall project to
   remove GPIO numbers.
 - Support for standby mode suspend states from Andrei Stefanescu.
 - New drivers for Allwinner AXP209, Cirrus Logic Lochnagar and
   Microchip MPC16502.

Linux 4.20

This is the 4.19.12 stable release

This is the 4.14.90 stable release

This is the 4.9.147 stable release

This is the 4.4.169 stable release

This is the 3.18.131 stable release

Device properties framework updates for 4.21-rc1

 - Introduce "software nodes", analogous to the DT and ACPI firmware
   nodes except that they can be created by kernel code, in order to
   complement fwnodes representing real firmware nodes when they are
   incomplete (for example missing device properties) and to supply
   the primary fwnode when the firmware lacks hardware description
   for a device completely, and replace the "property_set" struct
   fwnode_handle type with software nodes (Heikki Krogerus).

 - Clean up the just introduced software nodes support and fix a commet
   in the graph-handling code (Colin Ian King, Marco Felsch).

ACPI updates for 4.21-rc1

 - Update the ACPICA code in the kernel to the 20181213 upstream
   revision including:
   * New Windows _OSI strings (Bob Moore, Jung-uk Kim).
   * Buffers-to-string conversions update (Bob Moore).
   * Removal of support for expressions in package elements (Bob
     Moore).
   * New option to display method/object evaluation in debug output
     (Bob Moore).
   * Compiler improvements (Bob Moore, Erik Schmauss).
   * Minor debugger fix (Erik Schmauss).
   * Disassembler improvement (Erik Schmauss).
   * Assorted cleanups (Bob Moore, Colin Ian King, Erik Schmauss).

 - Add support for a new OEM _OSI string to indicate special handling
   of secondary graphics adapters on some systems (Alex Hung).

 - Make it possible to build the ACPI subystem without PCI support
   (Sinan Kaya).

 - Make the SPCR table handling regard baud rate 0 in accordance with
   the specification of it and make the DSDT override code support
   DSDT code names generated by recent ACPICA (Andy Shevchenko, Wang
   Dongsheng, Nathan Chancellor).

 - Add clock frequency for Hisilicon Hip08 SPI controller to the ACPI
   driver for AMD SoCs (APD) (Jay Fang).

 - Fix the PM handling during device init in the ACPI driver for
   Intel SoCs (LPSS) (Hans de Goede).

 - Avoid double panic()s by clearing the APEI GHES block_status
   before panic() (Lenny Szubowicz).

 - Clean up a function invocation in the ACPI core and get rid of
   some code duplication by using the DEFINE_SHOW_ATTRIBUTE macro
   in the APEI support code (Alexey Dobriyan, Yangtao Li).

Power management updates for 4.21-rc1

 - Add sysadmin documentation for cpuidle (Rafael Wysocki).

 - Make it possible to specify a cpuidle governor from kernel
   command line, add new cpuidle state sysfs attributes for
   governor evaluation, and improve the "polling" idle state
   handling (Rafael Wysocki).

 - Fix the handling of the "required-opps" DT property in the
   operating performance points (OPP) framework, improve the
   integration of it with the generic power domains (genpd)
   framework, improve the handling of performance states in
   them and clean up the idle states vs performance states
   separation in genpd (Viresh Kumar, Ulf Hansson).

 - Add a cpufreq driver called "qcom-hw" for Qualcomm SoCs using
   a hardware engine to control CPU frequency transitions along
   with DT bindings for it (Taniya Das).

 - Fix an intel_pstate driver issue related to CPU offline and
   update the documentation of it (Srinivas Pandruvada).

 - Clean up the imx6q cpufreq driver (Anson Huang).

 - Add SPDX license IDs to cpufreq schedutil governor files (Daniel
   Lezcano).

 - Switch over the runtime PM framework to using high-res timers
   for device autosuspend to allow the control of it to be more
   precise (Vincent Guittot).

 - Disable non-wakeup ACPI GPEs during suspend-to-idle so that they
   don't prevent the system from reaching the target low-power state
   and simplify the suspend-to-idle handling on ACPI platforms
   without full Low-Power S0 Idle (LPS0) support (Rafael Wysocki).

 - Add system-wide suspend and resume support to the devfreq
   framework (Lukasz Luba).

 - Clean up the SmartReflex adaptive voltage scaling (AVS) driver and
   add an SPDX license ID to it (Nishanth Menon, Uwe Kleine-König,
   Thomas Meyer).

 - Get rid of code duplication by using the DEFINE_SHOW_ATTRIBUTE
   macro in some places, fix some DT node refcount leaks, and do
   some other janitorial cleanups (Yangtao Li).

 - Update the cpupower, intel_pstate_tracer and turbosat utilities
   (Abhishek Goel, Doug Smythies, Len Brown).

GPIO fixes for v4.20:
- ACPI IRQ request deferral
- OMAP: revert deferred wakeup quirk
- MAX7301: fix DMA safe memory handling
- MVEBU: selective probe failure on missing clk

wireless-drivers-next patches for 4.21

Last set of patches for 4.21. mt76 is still in very active development
and having some refactoring as well as new features. But also other
drivers got few new features and fixes.

Major changes:

ath10k

* add amsdu support for QCA6174 monitor mode

* report tx rate using the new ieee80211_tx_rate_update() API

* wcn3990 support is not experimental anymore

iwlwifi

* support for FW version 43 for 9000 and 22000 series

brcmfmac

* add support for CYW43012 SDIO chipset

* add the raw 4354 PCIe device ID for unprogrammed Cypress boards

mwifiex

* add NL80211_STA_INFO_RX_BITRATE support

mt76

* use the same firmware for mt76x2e and mt76x2u

* mt76x0e survey support

* more unification between mt76x2 and mt76x0

* mt76x0e AP mode support

* mt76x0e DFS support

* rework and fix tx status handling for mt76x0 and mt76x2