Fix Regression with AXP20X for 6.13-rc1

From: Chris Morgan <[email protected]>

After performing a git bisect, I identified a commit that broke the battery and charger driver for my AXP717 PMIC. This was caused by commit e37ec3218870 ("mfd: axp20x: Allow multiple regulators").

After digging into it, it appears when mfd_add_devices was called with a platform ID of PLATFORM_DEVID_NONE, the devm_iio_channel_get() call made by the various AXP20X power drivers would not be able to generate a dev_name(dev) for some reason, and the iio_channel_get() call used in the devm_ helper would fall back to making a iio_channel_get_sys() call. After the platform ID was updated, now iio_channel_get() is no longer falling back to iio_channel_get_sys(). At least this is my limited understanding of what happened.

To fix this, I added a new devm_ helper of devm_iio_channel_get_sys() that directly calls iio_channel_get_sys(), and I updated all the affected drivers with the new routine. I then no longer experienced any issues with the drivers on my devices.

Chris Morgan (2):
iio: core: Add devm_ API for iio_channel_get_sys
power: supply: axp20x: Use devm_iio_channel_get_sys() for iio chans

 drivers/iio/inkern.c                    | 18 ++++++++++++++++++
 drivers/power/supply/axp20x_ac_power.c  |  4 ++--
 drivers/power/supply/axp20x_battery.c   | 16 ++++++++--------
 drivers/power/supply/axp20x_usb_power.c |  6 +++---
 include/linux/iio/consumer.h            | 20 ++++++++++++++++++++
 5 files changed, 51 insertions(+), 13 deletions(-)

2.43.0