[PATCH v2 0/12] Discover and probe dependencies

[Tomeu Vizoso <tomeu.vizoso@collabora.com>]

Hi,

this is version 2 of a series that probes devices in dependency order so
as to avoid deferred probes. While deferred probing is a powerful
solution that makes sure that you eventually get a working system at the
end of the boot, can make it very time consuming to find out why a
device didn't probe and can also introduce big delays in when a device
actually probes by sending it to the end of the deferred queue.

So far I have only tested on a Tegra124 Chromebook.

Thanks,

Tomeu

Changes in v2:
- Instead of delaying all probes until late_initcall, only delay matches
  of platform devices that have a firmware node attached.
- Allow bindings implementations register a function instead of using
  class callbacks, as not only subsystems implement firmware bindings.
- Move strends to string.h
- Document that consumers of backlight devices can use the 'backlight'
  property to hold a phandle to the backlight device.
- Allocate the list of dependencies and pass it to the function that
  fills it.

Tomeu Vizoso (12):
  device: property: delay device-driver matches
  device: property: find dependencies of a firmware node
  string: Introduce strends()
  gpio: register dependency parser for firmware nodes
  gpu: host1x: register dependency parser for firmware nodes
  backlight: Document consumers of backlight nodes
  backlight: register dependency parser for firmware nodes
  USB: EHCI: register dependency parser for firmware nodes
  regulator: register dependency parser for firmware nodes
  pwm: register dependency parser for firmware nodes
  ASoC: tegra: register dependency parser for firmware nodes
  driver-core: probe dependencies before probing

 .../bindings/video/backlight/backlight.txt         |  22 ++++
 drivers/base/dd.c                                  | 139 +++++++++++++++++++++
 drivers/base/property.c                            | 120 ++++++++++++++++++
 drivers/gpio/gpiolib.c                             |  54 ++++++++
 drivers/gpu/host1x/dev.c                           |  26 ++++
 drivers/pwm/core.c                                 |  28 +++++
 drivers/regulator/core.c                           |  27 ++++
 drivers/usb/host/ehci-tegra.c                      |  16 +++
 drivers/video/backlight/backlight.c                |  16 +++
 include/linux/fwnode.h                             |   5 +
 include/linux/property.h                           |  12 ++
 include/linux/string.h                             |  13 ++
 sound/soc/tegra/tegra_max98090.c                   |  42 ++++++-
 13 files changed, 519 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/video/backlight/backlight.txt

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2.4.1