[PATCH v7 0/6] add support for pf1550 PMIC MFD-based drivers

Samuel Kayode via B4 Relay
2025-06-12T14:59:20Z

This series adds support for pf1550 PMIC. It provides the core mfd driver and a
set of three sub-drivers for the regulator, power supply and input subsystems.

Patch 1 adds the DT binding document for the PMIC. Patches 2-5 adds the
pertinent drivers. Last patch adds a MAINTAINERS entry for the drivers.

The patches 3-5 depend on the mfd driver provided in patch 2.

Changes since v1:
- DT bindings for all devices included
- Add onkey driver
- Add driver for the regulators
- Ensure charger is activated as some variants have it off by default
- Update mfd and charger driver per feedback from eballetbo@gmail.com
- Add myself as maintainer for these drivers
- Link to v1: https://lore.kernel.org/1523974819-8711-1-git-send-email-abel.vesa@nxp.com/

Changes since v2:
- Rebase on recent mainline kernel v6.15
- Single yaml file containing dt bindings for all pf1550 devices
- irq mapping done in MFD driver as suggested by Dmitry Torokhov
- Drop unnecessary includes in drivers
- Replace dev_err with dev_err_probe in probe method of drivers
- Drop compatible string from drivers of the sub-devices
- Remove dependency on OF from drivers of the sub-devices
- onkey: move driver from input/keyboard into input/misc
- onkey: remove dependency on OF
- onkey: use onkey virqs instead of central irq
- onkey: fix integer overflow for regmap_write when unmasking
interrupts during pf1550_onkey_resume
- charger: add support for monitored-battery which is used in setting
a constant voltage for the charger.
- Address other feedback from Dmitry Torokhov and Krzysztof Kozlowski
- Link to v2: https://lore.kernel.org/cover.1747409892.git.samuel.kayode@savoirfairelinux.com/

Changes since v3:
- Update manufacturer from Freescale to NXP in compatible,
dt-binding and Kconfigs
- Use C++ style comments for SPDX license in .c code
- Add portions copyright to source code
- irqs are defined as struct resource in mfd cell such that
platform_get_irq is used in the sub-devices
- Make struct pf1550_dev of type const in sub-device driver
- irq variable dropped from sub-device driver struct
- EXPORT_SYMBOL of global pf1550_read_otp function for use in
regulator driver
- Drop unneeded info in driver_data when defining device table id
- regulator: validate ramp_delay
- regulator: report overcurrent and over temperature events
- onkey: drop unnecessary keycode variable
- onkey: change wakeup variable to type bool
- onkey: replace (error < 0) with error in if statement when possible
- onkey: use pm_sleep_ptr when defining driver.pm
- charger: finish handling of some interrupts in threaded irq handler
- Link to v3: https://lore.kernel.org/20250527-pf1550-v3-0-45f69453cd51@savoirfairelinux.com/

Changes since v4:
- Use top level interrupt to minimize number of registers checked on
each interrupt
- Fix bad offset for temperature interrupts of regulator irq chip
- Address Krzysztof's comments for dt-binding
- regulator: add comments to clarify difference in its interrupts
- regulator: issue warn event for _LS interrupt and error event for
_HS interrupt
- regulator: validate maximum and minimum ramp_delay
- charger: drop lock in battery and charger delayed_work
- charger: more conservative locking for vbus delayed_work
- charger: apply lock when setting power_supply type during register
intialization
- Link to v4: https://lore.kernel.org/r/20250603-pf1550-v4-0-bfdf51ee59cc@savoirfairelinux.com

Changes since v5:
- Ensure lowercase when assigning hex values
- Add imx@lists.linux.dev to relevant mailing list in MAINTAINERS file
- Use GENMASK macro
- Drop unused chips variable
- Read the OTP in the mfd driver probe for new dvs_enb variable
- Hardcode IRQ flags in pf1550_add_child function
- charger: drop the mutex entirely
- charger: reverse christmas tree style local variable definition in
probe
- Link to v5: https://lore.kernel.org/r/20250610-pf1550-v5-0-ed0d9e3aaac7@savoirfairelinux.com

Changes since v6:
- Use reverse christmas tree order
- Drop 0 in table id's driver data
- charger: store virq to avoid reinvoking platform_get_irq in ISR
- Link to v6: https://lore.kernel.org/r/20250611-pf1550-v6-0-34f2ddfe045e@savoirfairelinux.com

Signed-off-by: Samuel Kayode <samuel.kayode@savoirfairelinux.com>
---
Samuel Kayode (6):
dt-bindings: mfd: add pf1550
mfd: pf1550: add core mfd driver
regulator: pf1550: add support for regulator
input: pf1550: add onkey support
power: supply: pf1550: add battery charger support
MAINTAINERS: add an entry for pf1550 mfd driver

.../devicetree/bindings/mfd/nxp,pf1550.yaml | 137 +++++
MAINTAINERS | 11 +
drivers/input/misc/Kconfig | 11 +
drivers/input/misc/Makefile | 1 +
drivers/input/misc/pf1550-onkey.c | 183 ++++++
drivers/mfd/Kconfig | 14 +
drivers/mfd/Makefile | 2 +
drivers/mfd/pf1550.c | 339 +++++++++++
drivers/power/supply/Kconfig | 11 +
drivers/power/supply/Makefile | 1 +
drivers/power/supply/pf1550-charger.c | 632 +++++++++++++++++++++
drivers/regulator/Kconfig | 9 +
drivers/regulator/Makefile | 1 +
drivers/regulator/pf1550-regulator.c | 362 ++++++++++++
include/linux/mfd/pf1550.h | 254 +++++++++
15 files changed, 1968 insertions(+)
---
base-commit: 0a4b866d08c6adaea2f4592d31edac6deeb4dcbd
change-id: 20250527-pf1550-d401f0d07b80

Best regards,
--
Samuel Kayode <samuel.kayode@savoirfairelinux.com>