[PATCH v8 0/6] Introduce MAX77759 charger driver

[Amit Sunil Dhamne via B4 Relay]

MAX77759 PMIC is used in Pixel 6 and 6 Pro (Oriole/Raven) boards.
One of the functions of the MAX77759 PMIC is a battery charger. This
patchset introduces a driver for this function. One of the unique
features of this charger driver is that it works with a USB input where
the Type-C controller is TCPCI based.

Changes to the board files will follow soon once this patchset is reviewed.

For reference to the MAX77759 MFD based patchset (present in upstream):
https://lore.kernel.org/all/20250509-max77759-mfd-v10-0-962ac15ee3ef@xxxxxxxxxx/

Dependency list for patches (directionality indicates depends on):
[6] -> [5] -> [4] & [3]

Signed-off-by: Amit Sunil Dhamne <amitsd@xxxxxxxxxx>
---
Changes in v8:
- Add an newline char at the end of dev_* prints. (André Draszik)
- Return PTR_ERR() instead of -EPROBE_DEFER when devm_power_supply_register()
  fails in max77759 charger probe. (André Draszik)
- Link to v7: https://lore.kernel.org/r/20260218-max77759-charger-v7-0-e8d907ce69c5@xxxxxxxxxx

Changes in v7:
- Add register relock for protected registers in fail path. (André Draszik)
- Switch to usage of scoped_guard instead of guard. (LKP test bot)
- Link to v6: https://lore.kernel.org/r/20260214-max77759-charger-v6-0-28c09bda74b4@xxxxxxxxxx

Changes in v6:
-  Linear Range usage (André Draszik):
  - Dedicate individual arrays for inlim, chgcc & chg_cv_prm to simplify
    code.
  - Use numerical values instead of macros for linear_range array init.
  - Remove macros defining current and voltage limits due to above.
  - Didn't use Reviewed-by tag for Patch 3 due to the above.
  - Add new linear_ranges api to leverage it for obtaining selector
    values.
  - Improve voltage and current getters and setters functions by leveraging
    existing and new linear_ranges API.
- IRQ related changes (André Draszik)
  - Dedicated names for individual irqs.
  - Refactor irq handlers.
  - Ratelimit prints
- Retry mechanism (André Draszik):
  - Initialize error retry counter to 0 when psy work is scheduled on a
    new notifier event.
  - Protect the counter using a lock.
  - Add appropriate prints.
- Link to v5: https://lore.kernel.org/r/20260203-max77759-charger-v5-0-b50395376a5f@xxxxxxxxxx

Changes in v5:
- Use linear_range library instead of reinventing it. (André Draszik)
  - This requires a selector_max value so modified mfd/max77759.h to
    include it for CHGCC and CHG_ILIM.
  - Removed "reviewed-by" for Patch 3 (mfd) due to above
- Use asnyc probe type. (André Draszik)
- Retry mechanism for psy_work. (André Draszik)
- Minor nits (André Draszik):
  - Use named initializers for instantiating structs.
  - Use static qualifier for `psy_name` variable.
  - Refactor if-else ladder to remove else handling if return in prior
    "if" loop.
  - Remove redundant `unlikely`.
- Link to v4: https://lore.kernel.org/r/20260121-max77759-charger-v4-0-694234c8ded1@xxxxxxxxxx

Changes in v4:
- Removed a stray tabspace in mfd/max77759.h. (André Draszik)
- Fixed the following issues in Patch 4/5 (André Draszik):
  - Re-order Kconfig entry
  - Refactored to not use global variable
  - Use of clamp() to clamp values instead of duplicating logic
  - Return IRQ_NONE for unhandled irqs or error conditions
  - Remove debug messages in irq handler
  - Refactor code to use dev_err_probe in *_init_irqhandler()
  - Remove unneeded irq_flags
  - Check return values of regmap ops
  - Other nits like newlines, not using greedy init, using print stmnts
- Link to v3: https://lore.kernel.org/r/20251227-max77759-charger-v3-0-54e664f5ca92@xxxxxxxxxx

Changes in v3:
- Had incorrectly folded the charger sub-device with the pmic parent.
  Corrected it. (Krzysztof Kozlowski)
- Link to v2: https://lore.kernel.org/r/20251218-max77759-charger-v2-0-2b259980a686@xxxxxxxxxx

Changes in v2:
- Fold charger binding in maxim,max77759-charger.yaml to its parent
  node. (Krzysztof Kozlowski)
- Renamed regulator supplier & consumer. (Krzysztof Kozlowski & Heikki
  Krogerus)
- Removed explicit setting of irq trigger types in max77759 driver.
  (André Draszik & Krzysztof Kozlowski)
- Complete bit definitions for IRQ registers. (André Draszik)
- Consolidate all bit definitions for charger IP in mfd/max77759.h.
  (André Draszik)
- Modify the handling of charger IRQs such that regmap IRQ chip handles
  masking, de-mux and acking of interrupts. (André Draszik)
- Remove unused macro definitions relating to Charger modes in tcpci
  maxim driver (André Draszik)
- Add dependency on Regulator class in Kconfig definition for max77759
  chg. (Kernel Test Robot)
- Link to v1: https://lore.kernel.org/r/20251123-max77759-charger-v1-0-6b2e4b8f7f54@xxxxxxxxxx

---
Amit Sunil Dhamne (6):
      dt-bindings: mfd: maxim,max77759: reference power-supply schema and add regulator property
      dt-bindings: usb: maxim,max33359: Add supply property for vbus
      mfd: max77759: add register bitmasks and modify irq configs for charger
      lib/linear_ranges: Add linear_range_get_selector_high_array
      power: supply: max77759: add charger driver
      usb: typec: tcpm/tcpci_maxim: deprecate WAR for setting charger mode

 .../devicetree/bindings/mfd/maxim,max77759.yaml    |  16 +-
 .../devicetree/bindings/usb/maxim,max33359.yaml    |   4 +
 MAINTAINERS                                        |   6 +
 drivers/mfd/max77759.c                             |  91 ++-
 drivers/power/supply/Kconfig                       |  11 +
 drivers/power/supply/Makefile                      |   1 +
 drivers/power/supply/max77759_charger.c            | 774 +++++++++++++++++++++
 drivers/usb/typec/tcpm/tcpci_maxim.h               |   1 +
 drivers/usb/typec/tcpm/tcpci_maxim_core.c          |  54 +-
 include/linux/linear_range.h                       |   3 +
 include/linux/mfd/max77759.h                       | 176 ++++-
 lib/linear_ranges.c                                |  36 +
 12 files changed, 1114 insertions(+), 59 deletions(-)
---
base-commit: 8bf22c33e7a172fbc72464f4cc484d23a6b412ba
change-id: 20251105-max77759-charger-852b626d661a

Best regards,
-- 
Amit Sunil Dhamne <amitsd@xxxxxxxxxx>