IIO: 1st set of new device support, features and cleanup for 6.10

The Analog Device team (Paul Cercueil and Nuno Sa) have been working on
improving high speed device handling. They have had some support in their
own tree for many years, so it is great to see them bring it to upstream.
Some of that is seen here, with the first output device using the
IIO dmaengine infrastructure and a new DAC backend FPGA IP driver.
This makes use of a new set of interfaces to allow backend and
front end driver communication in a fashion that in theory at least
allows for a single driver for a given ADC / DAC independent of
the IP to which is being used to deal with the data bus and DMA aspects
of working with these devices. It is early days for this new
generic way of handling split devices, but as it's kernel internals only
we can merrily change anything about it as a wider diversity of devices
show up and we get a better feel for what works.

Alongside the usual set of new drivers and features we have
the automatic cleanup of fwnode_handle_put() which didn't quite make
it in last cycle. The equivalent DT version was merged by Rob Herring
via the DT binding tree and one patch using that in IIO can also be
found in this pull request. Rob has been making extensive use of that
infrastructure in the DT core which is good to see and provides more
evidence this basic approach is useful.

In some cases, the IIO driver was converted over from DT only to
using the generic firmware description handling of property.h
including using the new macros. The general preference for IIO
is to use this more generic handling where possible - a bunch of other
drivers have been converted this cycle as well.

New device support
==================

adi,ad7173
- New driver supporting AD7172-2, AD7172-4 AD7173-9, AD7175-2, AD7175-8,
  AD7176-2 and AD7177-2 ADCs.
- Follow up fix for an accidental use of logic not instead of bitwise.

adi,ad7944
- New driver supporting AD7944, AD7985 and AD7986 pin compatible ADCs.
- Later patch added use of new spi_optimize_message() to reduce overheads
  of setting up a reused message.
- Additional changes later in series reduced code duplication.

adi,ad9739a RF DAC
- New driver for this 14-bit 2.5 GSPS DAC via an LVDS interface.

adi,axi-dac
- Support for this FPGA IP used to send data to high performance DACs over
  an interface such as JESD204B/C or parallel interfaces.  Used in
  conjunction with a DAC driver. The initial user is the ad9739a.
  The dmaengine-buffer needed various changes to make it bidirectional.

avago,apds9306
- New driver for this ambient light sensor.
- Fix much later in this pull for an off by 1 error.

New device IDs
==============

For these at most an ID and a instance of chip specific data was needed.
Always nice to see manufacturers sticking to an existing software interface
for new parts.

allwinner,sun20i
- Add support for h616.
invensense,mpu6050
- Add support for ICM42688
maxim,max30102
- Add compatible for MAX30101
ti,dac5571
- Add compatible for DAC081C081

General
=======

fwnode_handle
- Support for cleanup.h based __free(fwnode_handle)
- Loop macro using this for looping over child nodes without needing to
  call fwnode_handle_put() in ever early exit from the loop.
- Used in:
  * adi,ad3552r
  * adi,ad4130
  * adi,ad5770r
  * adi,ad74413r
  * adi,ad7173
  * adi,adfm2000
  * linear,ltc2688
  * linear,ltc2983
  * maxim,max11410
  * microchip,pac1934
  * qcom,spmi-adc
  * renesas,rz2gl
  * st,ab8500
  * st,stm32 (Fix for failure to set return value precedes this patch,
    providing an example of why enabling direct returns makes bugs
    less likely)
- Conversions to fwnode also using the cleanup logic
  * adi,ad7124
  * adi,ad7292
  * freescale,fsl-imx25-gcq

- Other conversions to fwnode where the new cleanup handling isn't useful
  * adi,ad7192
  * avia,hx711
  * freescale,mma8452
  * nxp,fxls8962af
  * st,spear
  * ti,twl4030

Features
========

adi,adxl345
- Support SPI_3WIRE mode.

adi,ad9944
- Support 3-wire mode, note this isn't normal 3-wire SPI (unlike the
  adxl345 change above), but rather   a wiring scheme where the SPI
  chip select is used to trigger conversions rather than using a
  separate pin.
- Add some device specific documentation, mostly around the various wiring
  schemes.

invensense,mpu6050
- Add Wake on Motion support as an IIO event and as a wake-up source.

linear,ltc2983
- Add vdd-supply.

ti,hdc3020
- Add power management using trigger on demand mode and adding suspend and
  resume handling.
- Use reset GPIO if available.

Cleanup and fixes
================

iio core
- Use the various autocleanup and lock guards from cleanup.h to simplify
  the IIO core.
- Don't set the pointer used for iio_priv() if it is zero sized as that
  points beyond the end of the allocation. No driver actually uses it
  in that case but good to clean this up.

various drivers
- Drop unnecessary casts of other pointer types to void *

docs
- Add missing ABI entry for in_temp_input.

adi,adx345
- General cleanup prior to adding spi-3wire mode.

adi,axi-adc
- Be more flexible and allow minor version changes as these are expected
  to be backwards compatible.

avago,apds9300/9600
- Merge near identical bindings. The drivers are quite different, but
  the bindings can be shared. The apds9306 binding introduced in this
  series uses this shared binding doc as well.
- Add missing vdd-supply
- Update binding to use IRQ_TYPE_LEVEL_LOW instead of 8.

bosch,bmp280
- Organize headers

freescale,fxl-imx25-gcq
- Use devm_ for remaining probe() time setup allowing dropping
  of specific error handling and remove() functions.

infineon,dps310
- Fix handling of negative temperatures
- Bring style of other similar calls inline with the form needed
  for temperatures
- Ensure error handling of regmap calls is consistent within the driver.
- Simplify scale reading logic.

invensense,mpu6050
- Flip logic in binding to exclude devices without i2c-gate instead
  of opting in.  The list is expected to be much shorter as all recent
  devices support this feature.

honeywell,hsc030pa
- Use spi_read() instead of opening coding.

renesas,rcar
- Use device_for_each_child_of_node_scoped() to remove need to manually
  release. Left over from series the rest of which went in during 6.9.

st,ab8500
- Fix naming of function parameters in kernel-doc
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