[PATCH v6 00/11] Support for Samsung S2MU005 PMIC and its sub-devices

[Kaustabh Chakraborty <kauschluss@disroot.org>]

S2MU005 is an MFD chip manufactured by Samsung Electronics. This is
found in various devices manufactured by Samsung and others, including
all Exynos 7870 devices. It is known to have the following features:

1. Two LED channels with adjustable brightness for use as a torch, or a
   flash strobe.
2. An RGB LED with 8-bit channels. Usually programmed as a notification
   indicator.
3. An MUIC, which works with USB micro-B (and USB-C?). For the micro-B
   variant though, it measures the ID-GND resistance using an internal
   ADC.
4. A charger device, which reports if charger is online, voltage,
   resistance, etc.

This patch series implements a lot of these features. Naturally, this
series touches upon a lot of subsystems. The 'parent' is the MFD driver,
so the subsystems have some form of dependency to the MFD driver, so
they are not separable.

Here are the subsystems corresponding to the patch numbers:
dt-bindings - 01, 02, 03
mfd         - 03, 04, 05, 06
led         - 01, 07, 08, 09
extcon      - 02, 10
power       - 11

Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>
---
Changes in v6:
- Fix build, UAF, and functional errors with
  CONFIG_V4L2_FLASH_LED_CLASS=m (Lee Jones)
- Remove (ret < 0) wherever redundant (Lee Jones)
- Remove extra conditionals for supporting multiple variants (Lee Jones)
- Fix OOB condition in initailizing flash LED channels (Lee Jones)
- declare i inside for, like: for (int i = 0; ...) (Lee Jones)
- Rewrite and simplify closest timing function for clarity (Lee Jones)
- Link to v5: https://lore.kernel.org/r/20260424-s2mu005-pmic-v5-0-fcbc9da5a004@disroot.org

Changes in v5:
- Drop port property from charger dt binding (Krzysztof Kozlowski)
- Create separate dt binding for S2MU005 MFD (Krzysztof Kozlowski)
- Move RGB LED and charger schema to parent schema (Rob Herring)
- Fix error of using invalid revision mask
- Link to v4: https://lore.kernel.org/r/20260414-s2mu005-pmic-v4-0-7fe7480577e6@disroot.org

Changes in v4:
- Use OF graph to connect charger with MUIC in device tree
- Move DMA coherent mask to all MFD PMICs (André Draszik)
- Modify pointer names for flash/RGB drivers (Lee Jones)
- Use 100-char line wrap for flash/RGB drivers (Lee Jones)
- Revamp LED device initialization in flash driver (Lee Jones)
- Add proper USB 2.0 support in charger driver (Łukasz Lebiedziński)
- Link to v3: https://lore.kernel.org/r/20260225-s2mu005-pmic-v3-0-b4afee947603@disroot.org

Changes in v3:
- Remove "extcon" text from dt-bindings documentation (Rob Herring)
- Add connector for MUIC node
- Fix dt binding errors reported by robh's bot
- Fix kernel test robot const errors 
- Remove FIELD_PREP() values in register header file (André Draszik)
- Add max_register, volatile_reg, cache_type (André Draszik)
- Redo [v2 07/12] to NOT store the PMIC revision (André Draszik)
- Add a commit to fix DMA coherent mask in I2C PMICs
- Implement various flow changes in flash LED driver (André Draszik)
- Use device_for_each_child_node_scoped() (André Draszik)
- Fix CFI panic in devm_add_action_or_reset()
- Link to v2: https://lore.kernel.org/r/20260126-s2mu005-pmic-v2-0-78f1a75f547a@disroot.org

Changes in v2:
- Drop [v1 06/13], instead use regmap_irq_chip::get_irq_regs() 
- Remove references to driver in devicetree commits (Conor Dooley)
- Propagate errors of sec_pmic_store_rev() (André Draszik)
- Fix documentation language errors (Randy Dunlap)
- Link to v1: https://lore.kernel.org/r/20251114-s2mu005-pmic-v1-0-9e3184d3a0c9@disroot.org

To: Lee Jones <lee@kernel.org>
To: Pavel Machek <pavel@kernel.org>
To: Rob Herring <robh@kernel.org>
To: Krzysztof Kozlowski <krzk+dt@kernel.org>
To: Conor Dooley <conor+dt@kernel.org>
To: Kaustabh Chakraborty <kauschluss@disroot.org>
To: MyungJoo Ham <myungjoo.ham@samsung.com>
To: Chanwoo Choi <cw00.choi@samsung.com>
To: Krzysztof Kozlowski <krzk@kernel.org>
To: André Draszik <andre.draszik@linaro.org>
To: Nam Tran <trannamatk@gmail.com>
To: Jonathan Corbet <corbet@lwn.net>
To: Shuah Khan <skhan@linuxfoundation.org>
To: Sebastian Reichel <sre@kernel.org>
Cc: linux-leds@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-doc@vger.kernel.org
Cc: linux-pm@vger.kernel.org

---
Kaustabh Chakraborty (11):
      dt-bindings: leds: document Samsung S2M series PMIC flash LED device
      dt-bindings: extcon: document Samsung S2M series PMIC extcon device
      dt-bindings: mfd: add documentation for S2MU005 PMIC
      mfd: sec: add support for S2MU005 PMIC
      mfd: sec: set DMA coherent mask
      mfd: sec: resolve PMIC revision in S2MU005
      leds: flash: add support for Samsung S2M series PMIC flash LED device
      leds: rgb: add support for Samsung S2M series PMIC RGB LED device
      Documentation: leds: document pattern behavior of Samsung S2M series PMIC RGB LEDs
      extcon: add support for Samsung S2M series PMIC extcon devices
      power: supply: add support for Samsung S2M series PMIC charger device

 .../bindings/extcon/samsung,s2mu005-muic.yaml      |  40 ++
 .../bindings/leds/samsung,s2mu005-flash.yaml       |  52 +++
 .../bindings/mfd/samsung,s2mu005-pmic.yaml         | 120 ++++++
 Documentation/leds/index.rst                       |   1 +
 Documentation/leds/leds-s2m-rgb.rst                |  60 +++
 drivers/extcon/Kconfig                             |  10 +
 drivers/extcon/Makefile                            |   1 +
 drivers/extcon/extcon-s2m.c                        | 345 +++++++++++++++++
 drivers/leds/flash/Kconfig                         |  12 +
 drivers/leds/flash/Makefile                        |   1 +
 drivers/leds/flash/leds-s2m-flash.c                | 352 +++++++++++++++++
 drivers/leds/rgb/Kconfig                           |  11 +
 drivers/leds/rgb/Makefile                          |   1 +
 drivers/leds/rgb/leds-s2m-rgb.c                    | 416 +++++++++++++++++++++
 drivers/mfd/sec-common.c                           |  37 +-
 drivers/mfd/sec-i2c.c                              |  29 ++
 drivers/mfd/sec-irq.c                              |  74 ++++
 drivers/power/supply/Kconfig                       |  11 +
 drivers/power/supply/Makefile                      |   1 +
 drivers/power/supply/s2m-charger.c                 | 299 +++++++++++++++
 include/linux/mfd/samsung/core.h                   |   1 +
 include/linux/mfd/samsung/irq.h                    |  66 ++++
 include/linux/mfd/samsung/s2mu005.h                | 332 ++++++++++++++++
 23 files changed, 2266 insertions(+), 6 deletions(-)
---
base-commit: e98d21c170b01ddef366f023bbfcf6b31509fa83
change-id: 20251112-s2mu005-pmic-0c67fa6bac3c

Best regards,
--  
Kaustabh Chakraborty <kauschluss@disroot.org>