[PATCH v2 00/10] hwmon: Add Qualcomm SPMI BCL driver

[Manaf Meethalavalappu Pallikunhi]

This series introduces support for the Qualcomm SPMI PMIC Battery Current
Limiting (BCL) hardware monitor present in various Qualcomm PMICs.

The BCL hardware ensures robust battery protection by monitoring battery
conditions in real time and triggering interrupts when predefined
thresholds are crossed. These alerts allow the system to respond
proactively, preventing battery degradation and preserving system
reliability under adverse power conditions.

The driver integrates with the standard hwmon subsystem, exposing battery
measurements and configurable alarm thresholds. This design enables
seamless integration with existing system monitoring tools and thermal
management frameworks.

Key features:
- Battery/system under voltage and over current monitoring support
- Real-time voltage and current readings support
- Configurable threshold-based alarms (warning and critical levels)
- Interrupt-driven notifications for threshold violations
- Automatic threshold management with polling-based recovery
- Hardware-specific scaling factors and threshold representations

Voltage and current monitoring can be independently enabled/disabled
by firmware, and the driver automatically detects the enabled features
at probe time.

Signed-off-by: Manaf Meethalavalappu Pallikunhi <manaf.pallikunhi@xxxxxxxxxxxxxxxx>
---
Changes in v2:
- Reworked the binding from the generic qcom,bcl-hwmon.yaml schema to a
  PMIC-specific qcom,pm7250b-bcl.yaml schema using exact compatible strings.(Krzysztof)
- Dropped the DT-configured overcurrent-thresholds-milliamp property.(Konrad)
- Renamed interrupt names from "bcl-max-min"/"bcl-critical" to
  "max-min"/"critical".(Krzysztof)
- Limited the binding and driver match table to the supported PMICs:
  PM7250B, PM8350C, PM8550, PMH0101, PMIH0108, SMB2360 and SMB2370.(Daniel)
- Folded qcom-bcl-hwmon.h into qcom-bcl-hwmon.c and removed the
  macro-generated alarm mapping helpers.(Krzysztof/Bjorn/Daniel)
- Reworked the driver around per-PMIC register descriptors instead of
  generic BCL generation/mode descriptors.(Krzysztof/Bjorn)
- Added support for 16-bit voltage/current input registers and
  SMB2360/SMB2370 2S/3S battery configuration based scaling.
- Build hwmon channel information dynamically from hardware enable state
  instead of registering static voltage/current channel sets.(Daniel)
- Improved alarm IRQ handling with per-alarm locking, wake state tracking,
  shutdown guards, and explicit delayed-work cleanup.
- Switched probe/error paths to dev_err_probe() and tightened BCL enable,
  regmap-field, and hwmon registration handling.
- Link to v1: https://lore.kernel.org/r/20260206-qcom-bcl-hwmon-v1-0-7b426f0b77a1@xxxxxxxxxxxxxxxx

---
Manaf Meethalavalappu Pallikunhi (10):
      dt-bindings: hwmon: Describe Qualcomm BCL hardware
      hwmon: Add Qualcomm PMIC BCL driver
      arm64: dts: qcom: pm7250b: Enable BCL sensor node
      arm64: dts: qcom: hamoa-pmic: Enable BCL sensor node
      arm64: dts: qcom: pm8350c: Enable BCL sensor node
      arm64: dts: qcom: pmh0101: Enable BCL sensor node
      arm64: dts: qcom: pm8550: Enable BCL sensor node
      arm64: dts: qcom: pmih0108-kaanapali: Enable BCL sensor node
      arm64: dts: qcom: pmih0108: Enable BCL sensor node
      arm64: dts: qcom: smb2370: Enable BCL sensor node

 .../bindings/hwmon/qcom,pm7250b-bcl.yaml           |   64 +
 .../devicetree/bindings/mfd/qcom,spmi-pmic.yaml    |    4 +
 MAINTAINERS                                        |    8 +
 arch/arm64/boot/dts/qcom/hamoa-pmics.dtsi          |    9 +
 arch/arm64/boot/dts/qcom/pm7250b.dtsi              |    9 +
 arch/arm64/boot/dts/qcom/pm8350c.dtsi              |   10 +
 arch/arm64/boot/dts/qcom/pm8550.dtsi               |    9 +
 arch/arm64/boot/dts/qcom/pmh0101.dtsi              |    9 +
 arch/arm64/boot/dts/qcom/pmih0108-kaanapali.dtsi   |    9 +
 arch/arm64/boot/dts/qcom/pmih0108.dtsi             |    9 +
 arch/arm64/boot/dts/qcom/smb2370.dtsi              |    9 +
 drivers/hwmon/Kconfig                              |   11 +
 drivers/hwmon/Makefile                             |    1 +
 drivers/hwmon/qcom-bcl-hwmon.c                     | 1443 ++++++++++++++++++++
 14 files changed, 1604 insertions(+)
---
base-commit: 3fe08b9796f36ef437ab9328e7dd1e5ff2d66603
change-id: 20260720-qcom-bcl-hwmon-6d602c195eab

Best regards,
-- 
Manaf Meethalavalappu Pallikunhi <manaf.pallikunhi@xxxxxxxxxxxxxxxx>