[PATCH v4 0/4] power: supply: MAX17040: Add IRQ for low level and alert SOC changes

[Matheus Castello <matheus@castello.eng.br>]

This series add IRQ handler for low level SOC alert, define a devicetree
binding attribute to configure the alert level threshold and check for
changes in SOC and power supply status for send uevents.

Max17043/17044 have a pin for alert host about low level state of charge and
this alert can be configured in a threshold from 1% up to 32% of SOC.

Tested on Toradex Colibri iMX7D, with a SparkFun Lipo Fuel Gauge module
based on MAXIM MAX17043.

Thanks Krzysztof for your time reviewing it. Let me know what you think about
the fixes.

Changes since v3:
(Suggested by Krzysztof Kozlowski)
- Validate values of the maxim,alert-low-soc-level early as possible
- Clear the alert bit while handling IRQ
- Remove the "chip->alert_bit"
- Check the SOC and status at the same time on max17040_work
- Add note about the compatible of devices with ALERT feature
- Only set alert register and IRQ when compatible is max77836

Changes since v2:
(Suggested by Krzysztof Kozlowski)
- Fix ebusy exception
- Remove device_init_wakeup from probe, let wakeup-source from DT decide that
- Fix the use of "charger" to fuel-gauge on device tree description
- Clear ALRT bit while setting the SOC threshold
- Check SOC and clear ALRT bit when the SOC are above alert threshold
- Fix unnecessary uevent when SOC is an ERRNO
- Notify user space when power supply status change

(Suggested by Rob Herring)
- Fix the use of "charger" to fuel-gauge on device tree description
- Add the (%) units on the description of property
- Drop interrupt-parent
- Fix name of property to let clear that is a low level SOC alert

Changes since v1:
(Suggested by Krzysztof Kozlowski)
- Put common code from max17040_work and max17040_thread_handler in a function
- Code style fixes
- Define mask and low level threshold alert default
- Check return value from max17040_set_soc_threshold
- Set low level state of charge threshold before IRQ
- CC maintainers from drivers/mfd/max14577
- Use flags from FDT client->flags instead hard coded it
- Mention interrupts on DT Documentation
- Fix "maxim,max77836-battery" missed from DT Documentation
- Fix commit description

Matheus Castello (4):
  power: supply: max17040: Add IRQ handler for low SOC alert
  dt-bindings: power: supply: Max17040: Add low level SOC alert
    threshold
  power: supply: max17040: Config alert SOC low level threshold from FDT
  power: supply: max17040: Send uevent in SOC and status change

 .../power/supply/max17040_battery.txt         |  33 +++++
 drivers/power/supply/max17040_battery.c       | 134 +++++++++++++++++-
 2 files changed, 162 insertions(+), 5 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/power/supply/max17040_battery.txt

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2.24.0.rc2