linux-kernel - [PATCH 0/4] hwmon: Add Qualcomm PMIC BCL hardware monitor driver

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Message-Id: <20260206-qcom-bcl-hwmon-v1-0-7b426f0b77a1@oss.qualcomm.com>
Date: Fri, 06 Feb 2026 02:44:04 +0530
From: Manaf Meethalavalappu Pallikunhi <manaf.pallikunhi@....qualcomm.com>
To: Guenter Roeck <linux@...ck-us.net>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, amit.kucheria@....qualcomm.com,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Gaurav Kohli <gaurav.kohli@....qualcomm.com>
Cc: linux-hwmon@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Manaf Meethalavalappu Pallikunhi <manaf.pallikunhi@....qualcomm.com>
Subject: [PATCH 0/4] hwmon: Add Qualcomm PMIC BCL hardware monitor driver

Add support for Qualcomm PMIC Battery Current Limiting (BCL) hardware
monitor driver. The BCL peripheral is present in Qualcomm PMICs and
provides real-time monitoring battery overcurrent and under voltage
conditions.

Hardware Overview:
The BCL hardware monitors battery voltage and current through dedicated
channels with configurable thresholds. It supports different alarm
levels with independent interrupt lines:
- Level 0 (LVL0): Maximum/Minimum threshold - mapped to hwmon min/max
- Level 1 (LVL1): Critical threshold - mapped to hwmon lcrit/crit

There are 3 modes of BCL hardware
- BMX -  Both under voltage and over current monitor support
- CORE - Only under voltage monitor support
- WB -   Both under voltage and over current monitor support. It also
         supports current comparator for current monitor

The hardware uses different threshold representation schemes:
- Raw ADC values for Level 0 voltage thresholds
- Indexed values for Level 1 voltage thresholds
- Raw ADC values with variant-specific scaling for current thresholds
- Indexed value for current threshold for BCL WB modes.

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@....qualcomm.com>
---
Manaf Meethalavalappu Pallikunhi (4):
      dt-bindings: hwmon: Add qcom,bcl-hwmon yaml bindings
      hwmon: Add Qualcomm PMIC BCL hardware monitor driver
      arm64: dts: qcom: pm7250b: Enable Qualcomm BCL device
      arm64: dts: qcom: pm8350c: Enable Qualcomm BCL device

 .../devicetree/bindings/hwmon/qcom,bcl-hwmon.yaml  | 128 +++
 MAINTAINERS                                        |   9 +
 arch/arm64/boot/dts/qcom/pm7250b.dtsi              |  10 +
 arch/arm64/boot/dts/qcom/pm8350c.dtsi              |   9 +
 drivers/hwmon/Kconfig                              |   9 +
 drivers/hwmon/Makefile                             |   1 +
 drivers/hwmon/qcom-bcl-hwmon.c                     | 982 +++++++++++++++++++++
 drivers/hwmon/qcom-bcl-hwmon.h                     | 311 +++++++
 8 files changed, 1459 insertions(+)
---
base-commit: 0f8a890c4524d6e4013ff225e70de2aed7e6d726
change-id: 20260206-qcom-bcl-hwmon-149ce73d9440

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