[PATCH v5 0/2] power: supply: max17042: cleanup and more features

[Dzmitry Sankouski]

Fuelgauge blocks often are incorporated in bigger chip,
which may use only 1 line for interrupts. Shared-irq
handles that case by requesting irq as shared.

Maxim PMICs may include fuel gauge with additional features, which is
out of single Linux power supply driver scope.

For example, in max77705 PMIC fuelgauge has additional registers,
like IIN_REG, VSYS_REG, ISYS_REG. Those needed to measure PMIC input
current, system voltage and current respectively. Those measurements
cannot be bound to any of fuelgauge properties.

The solution here add and option to use max17042 driver as a MFD
sub device, thus allowing any additional functionality be implemented as
another sub device. This will help to reduce code duplication in MFD
fuel gauge drivers.

Make max17042 interrupt shared, and add platform driver
version.

Signed-off-by: Dzmitry Sankouski <dsankouski@xxxxxxxxx>
---
Changes in v5:
- platform version: use parent device of_node as current device.
  This is because mfd driver matches fuel gauge node, and max17042
  platform variant is intended to match a mfd subdevice.
- fix platform version issues.
- Link to v4: https://lore.kernel.org/r/20241108-b4-max17042-v4-0-87c6d99b3d3d@xxxxxxxxx

Changes in v4:
- review fixes.
- Link to v3: https://lore.kernel.org/r/20241118-b4-max17042-v3-0-9bcaeda42a06@xxxxxxxxx

Changes in v3:
- pass dev pointer to probe
- Link to v2: https://lore.kernel.org/r/20241108-b4-max17042-v2-0-f058f7a16bab@xxxxxxxxx

Changes in v2:
- drop NACKed commits
- make shared interrupts unconditionally
- rework descriptions
- add platform driver version
- Link to v1: https://lore.kernel.org/r/20241109-b4-max17042-v1-0-9e2b07e54e76@xxxxxxxxx

---
Dzmitry Sankouski (2):
      power: supply: max17042: make interrupt shared
      power: supply: max17042: add platform driver variant

 drivers/power/supply/max17042_battery.c | 200 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----------------------------------------------------------
 1 file changed, 142 insertions(+), 58 deletions(-)
---
base-commit: 8155b4ef3466f0e289e8fcc9e6e62f3f4dceeac2
change-id: 20241108-b4-max17042-9306fc75afae

Best regards,
-- 
Dzmitry Sankouski <dsankouski@xxxxxxxxx>