[00/18] Add functionality to ipu3-cio2 driver allowing software_node connections to sensors on platforms designed for Windows

Hello all

Previous version:

https://lore.kernel.org/linux-media/20201019225903.14276-1-djrscally@gmail.com/

This series aims to add support for webcams on laptops with ACPI tables
designed for use with CIO2 on Windows. There are two main parts; the
first is extending the ipu3-cio2 driver to allow for patching the
firmware via software_nodes if endpoints aren't defined by ACPI. Patch #13
deals directly with that, all preceding patches are either supplemental
changes or incidental fixes along the way.

The second main part is a way to handle the unusual definition of resource
destined for the sensors in these ACPI tables; regulators and GPIO lines
that are supposed to be consumed by the sensor are lumped in the _CRS of
a dummy ACPI device upon which the sensor is dependent. Patch 18 defines a
new driver to handle those dummy devices and map the resources to the
sensor instead. 14-17 are supporting changes for that driver.

Changelogs mostly in the individual patches, but a broad summary:

	- Altered fwnode_device_is_available() to return true if the
	fwnode_handle doesn't implement that operation.
	- Altered fwnode_graph_get_endpoint_by_id() to parse secondary
	if no endpoint found on primary.
	- Enforce parent->child ordering of software_nodes on registration
	- Added a function to get the next ACPI device with matching _HID,
	plus an iterator macro
	- Altered cio2-bridge.c to store the bridge struct (and basically
	everything else) in heap, plus removed the requirement to delay
	ipu3-cio2 probe until after the i2c devices were instantiated. 
	Also now ensured we handle multiple sensors with the same _HID.
	- Added a function to get devices _dependent_ on a given ACPI dev,
	according to their _DEP entries.
	- Added a function to explicitly construct the name of an I2C dev
	created from an ACPI dev.
	- Added a driver to handle the dummy ACPI devices discussed above.

Comments very welcome!

Dan Scally (1):
  i2c: i2c-core-base: Use the new i2c_acpi_dev_name() in
    i2c_set_dev_name()

Daniel Scally (16):
  property: Return true in fwnode_device_is_available for node types
    that do not implement this operation
  property: Add support for calling fwnode_graph_get_endpoint_by_id()
    for fwnode->secondary
  software_node: Fix failure to put() and get() references to children
    in software_node_get_next_child()
  software_node: Enforce parent before child ordering of nodes array for
    software_node_register_nodes()
  software_node: Alter software_node_unregister_nodes() to unregister
    the array in reverse order
  software_node: amend software_node_unregister_node_group() to perform
    unregistration of array in reverse order to be consistent with
    software_node_unregister_nodes()
  lib/test_printf.c: Use helper function to unwind array of
    software_nodes
  ipu3-cio2: Add T: entry to MAINTAINERS
  ipu3-cio2: Rename ipu3-cio2.c to allow module to be built from
    multiple source files retaining ipu3-cio2 name
  media: v4l2-core: v4l2-async: Check possible match in match_fwnode
    based on sd->fwnode->secondary
  acpi: Add acpi_dev_get_next_match_dev() and macro to iterate through
    acpi_devices matching a given _HID
  ipu3-cio2: Add functionality allowing software_node connections to
    sensors on platforms designed for Windows
  acpi: utils: Add function to fetch dependent acpi_devices
  i2c: i2c-core-acpi: Add i2c_acpi_dev_name()
  gpio: gpiolib-acpi: Export acpi_get_gpiod()
  ipu3: Add driver for dummy INT3472 ACPI device

Heikki Krogerus (1):
  software_node: Add support for fwnode_graph*() family of functions

 MAINTAINERS                                   |   9 +
 drivers/acpi/utils.c                          |  98 ++++-
 drivers/base/property.c                       |   9 +
 drivers/base/swnode.c                         | 157 +++++++-
 drivers/gpio/gpiolib-acpi.c                   |   3 +-
 drivers/i2c/i2c-core-acpi.c                   |  14 +
 drivers/i2c/i2c-core-base.c                   |   2 +-
 drivers/media/pci/intel/ipu3/Kconfig          |  32 ++
 drivers/media/pci/intel/ipu3/Makefile         |   4 +
 drivers/media/pci/intel/ipu3/cio2-bridge.c    | 260 ++++++++++++
 drivers/media/pci/intel/ipu3/cio2-bridge.h    | 108 +++++
 drivers/media/pci/intel/ipu3/int3472.c        | 381 ++++++++++++++++++
 drivers/media/pci/intel/ipu3/int3472.h        |  96 +++++
 .../ipu3/{ipu3-cio2.c => ipu3-cio2-main.c}    |  27 ++
 drivers/media/pci/intel/ipu3/ipu3-cio2.h      |   6 +
 drivers/media/v4l2-core/v4l2-async.c          |   8 +
 include/acpi/acpi_bus.h                       |   9 +
 include/linux/acpi.h                          |   5 +
 include/linux/i2c.h                           |   5 +
 lib/test_printf.c                             |   4 +-
 20 files changed, 1213 insertions(+), 24 deletions(-)
 create mode 100644 drivers/media/pci/intel/ipu3/cio2-bridge.c
 create mode 100644 drivers/media/pci/intel/ipu3/cio2-bridge.h
 create mode 100644 drivers/media/pci/intel/ipu3/int3472.c
 create mode 100644 drivers/media/pci/intel/ipu3/int3472.h
 rename drivers/media/pci/intel/ipu3/{ipu3-cio2.c => ipu3-cio2-main.c} (98%)