Merge tag 'for-v6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply

Pull power supply and reset updates from Sebastian Reichel:
  "Power-supply core:
   - documentation fixes

  power-supply drivers:
   - add BD71828 charger driver
   - add Richtek RT9756 driver
   - max77705: add adaptive input current support
   - max77705: add support for multiple devices
   - misc small fixes

  reset drivers:
   - add spacemit-p1 poweroff/reboot driver"

* tag 'for-v6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply:
  Revert "power: supply: qcom_battmgr: support disabling charge control"
  Documentation: power: rt9756: Document exported sysfs entries
  power: supply: rt9756: Add Richtek RT9756 smart cap divider charger
  dt-bindings: power: supply: Add Richtek RT9756 smart cap divider charger
  driver: reset: spacemit-p1: add driver for poweroff/reboot
  power: supply: apm_power: only unset own apm_get_power_status
  power: supply: use ktime_divns() to avoid 64-bit division
  docs: power: clean up power_supply_class.rst
  power: supply: qcom_battmgr: support disabling charge control
  power: supply: qcom_battmgr: clamp charge control thresholds
  power: supply: wm831x: Check wm831x_set_bits() return value
  power: supply: rt9467: Prevent using uninitialized local variable in rt9467_set_value_from_ranges()
  power: supply: rt9467: Return error on failure in rt9467_set_value_from_ranges()
  power: supply: max17040: Check iio_read_channel_processed() return code
  power: supply: cw2015: Check devm_delayed_work_autocancel() return code
  power: supply: rt5033_charger: Fix device node reference leaks
  power: supply: max77705: Fix potential IRQ chip conflict when probing two devices
  power: supply: max77705_charger: implement aicl feature
  MAINTAINERS: Add entry for BD71828 charger
  power: supply: Add bd718(15/28/78) charger driver

3 files changed, 144 insertions, 42 deletions

diff --git a/Documentation/ABI/testing/sysfs-class-power-rt9756 b/Documentation/ABI/testing/sysfs-class-power-rt9756
new file mode 100644
index 000000000000..c4d6c2b4715d
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-power-rt9756
@@ -0,0 +1,30 @@
+What:		/sys/class/power_supply/rt9756-*/watchdog_timer
+Date:		Dec 2025
+KernelVersion:	6.19
+Contact:	ChiYuan Huang <cy_huang@richtek.com>
+Description:
+		This entry shows and sets the watchdog timer when rt9756 charger
+		operates in charging mode. When the timer expires, the device
+		will disable the charging. To prevent the timer expires, any
+		host communication can make the timer restarted.
+
+		Access: Read, Write
+
+		Valid values:
+		- 500, 1000, 5000, 30000, 40000, 80000, 128000 or 255000 (milliseconds),
+		- 0: disabled
+
+What:		/sys/class/power_supply/rt9756-*/operation_mode
+Date:		Dec 2025
+KernelVersion:	6.19
+Contact:	ChiYuan Huang <cy_huang@richtek.com>
+Description:
+		This entry shows and set the operation mode when rt9756 charger
+		operates in charging phase. If 'bypass' mode is used, internal
+		path will connect vbus directly to vbat. Else, default 'div2'
+		mode for the switch-cap charging.
+
+		Access: Read, Write
+
+		Valid values:
+		- 'bypass' or 'div2'
diff --git a/Documentation/devicetree/bindings/power/supply/richtek,rt9756.yaml b/Documentation/devicetree/bindings/power/supply/richtek,rt9756.yaml
new file mode 100644
index 000000000000..a88bf6cd1927
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/supply/richtek,rt9756.yaml
@@ -0,0 +1,72 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/power/supply/richtek,rt9756.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Richtek RT9756 Smart Cap Divider Charger
+
+maintainers:
+  - ChiYuan Huang <cy_huang@richtek.com>
+
+description: |
+  The RT9756/RT9757 is a high efficiency and high charge current charger.
+
+  The efficiency is up to 98.2% when VBAT = 4V, IBAT = 2A in DIV2 mode and 99.1%
+  when VBAT=4V, IBAT=1A in bypass mode. The maximum charger current is up to 8A
+  in DIV2 mode and 5A in bypass mode. The device integrates smart cap divider
+  topology, direct charging mode, external over-voltage protection control, an
+  input reverse blocking NFET and 2-way regulation, a dual phase charge pump
+  core, 8-Channel high speed ADCs and USB BC 1.2 detection.
+
+  RT9770 is almost the same with RT9756/57, only BC 1.2 detection function is
+  removed to shrink the die size.
+
+allOf:
+  - $ref: power-supply.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - richtek,rt9756
+          - richtek,rt9770
+      - items:
+          - enum:
+              - richtek,rt9757
+          - const: richtek,rt9756
+
+  reg:
+    maxItems: 1
+
+  wakeup-source: true
+
+  interrupts:
+    maxItems: 1
+
+  shunt-resistor-micro-ohms:
+    description: Battery current sense resistor mounted.
+    default: 2000
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      charger@6f {
+        compatible = "richtek,rt9756";
+        reg = <0x6f>;
+        wakeup-source;
+        interrupts-extended = <&gpio_intc 32 IRQ_TYPE_EDGE_FALLING>;
+        shunt-resistor-micro-ohms = <5000>;
+      };
+    };
diff --git a/Documentation/power/power_supply_class.rst b/Documentation/power/power_supply_class.rst
index da8e275a14ff..6d11f8c594a0 100644
--- a/Documentation/power/power_supply_class.rst
+++ b/Documentation/power/power_supply_class.rst
@@ -7,35 +7,35 @@ Synopsis
 Power supply class used to represent battery, UPS, AC or DC power supply
 properties to user-space.
 
-It defines core set of attributes, which should be applicable to (almost)
+It defines a core set of attributes which should be applicable to (almost)
 every power supply out there. Attributes are available via sysfs and uevent
 interfaces.
 
-Each attribute has well defined meaning, up to unit of measure used. While
+Each attribute has a well-defined meaning, up to the unit of measure used. While
 the attributes provided are believed to be universally applicable to any
 power supply, specific monitoring hardware may not be able to provide them
 all, so any of them may be skipped.
 
-Power supply class is extensible, and allows to define drivers own attributes.
-The core attribute set is subject to the standard Linux evolution (i.e.
-if it will be found that some attribute is applicable to many power supply
-types or their drivers, it can be added to the core set).
+The power supply class is extensible and allows drivers to define their own
+attributes.  The core attribute set is subject to the standard Linux evolution
+(i.e., if some attribute is found to be applicable to many power
+supply types or their drivers, it can be added to the core set).
 
-It also integrates with LED framework, for the purpose of providing
+It also integrates with the LED framework, for the purpose of providing
 typically expected feedback of battery charging/fully charged status and
 AC/USB power supply online status. (Note that specific details of the
 indication (including whether to use it at all) are fully controllable by
-user and/or specific machine defaults, per design principles of LED
-framework).
+user and/or specific machine defaults, per design principles of the LED
+framework.)
 
 
 Attributes/properties
 ~~~~~~~~~~~~~~~~~~~~~
-Power supply class has predefined set of attributes, this eliminates code
-duplication across drivers. Power supply class insist on reusing its
+The power supply class has a predefined set of attributes. This eliminates code
+duplication across drivers. The power supply class insists on reusing its
 predefined attributes *and* their units.
 
-So, userspace gets predictable set of attributes and their units for any
+So, userspace gets a predictable set of attributes and their units for any
 kind of power supply, and can process/present them to a user in consistent
 manner. Results for different power supplies and machines are also directly
 comparable.
@@ -61,7 +61,7 @@ Attributes/properties detailed
 |               **Charge/Energy/Capacity - how to not confuse**            |
 +--------------------------------------------------------------------------+
 | **Because both "charge" (µAh) and "energy" (µWh) represents "capacity"   |
-| of battery, this class distinguish these terms. Don't mix them!**        |
+| of battery, this class distinguishes these terms. Don't mix them!**      |
 |                                                                          |
 | - `CHARGE_*`                                                             |
 |	attributes represents capacity in µAh only.                        |
@@ -81,7 +81,7 @@ _NOW
 
 STATUS
   this attribute represents operating status (charging, full,
-  discharging (i.e. powering a load), etc.). This corresponds to
+  discharging (i.e., powering a load), etc.). This corresponds to
   `BATTERY_STATUS_*` values, as defined in battery.h.
 
 CHARGE_TYPE
@@ -92,10 +92,10 @@ CHARGE_TYPE
 
 AUTHENTIC
   indicates the power supply (battery or charger) connected
-  to the platform is authentic(1) or non authentic(0).
+  to the platform is authentic(1) or non-authentic(0).
 
 HEALTH
-  represents health of the battery, values corresponds to
+  represents health of the battery. Values corresponds to
   POWER_SUPPLY_HEALTH_*, defined in battery.h.
 
 VOLTAGE_OCV
@@ -103,11 +103,11 @@ VOLTAGE_OCV
 
 VOLTAGE_MAX_DESIGN, VOLTAGE_MIN_DESIGN
   design values for maximal and minimal power supply voltages.
-  Maximal/minimal means values of voltages when battery considered
+  Maximal/minimal means values of voltages when battery is considered
   "full"/"empty" at normal conditions. Yes, there is no direct relation
   between voltage and battery capacity, but some dumb
   batteries use voltage for very approximated calculation of capacity.
-  Battery driver also can use this attribute just to inform userspace
+  A battery driver also can use this attribute just to inform userspace
   about maximal and minimal voltage thresholds of a given battery.
 
 VOLTAGE_MAX, VOLTAGE_MIN
@@ -122,16 +122,16 @@ CURRENT_BOOT
   Reports the current measured during boot
 
 CHARGE_FULL_DESIGN, CHARGE_EMPTY_DESIGN
-  design charge values, when battery considered full/empty.
+  design charge values, when battery is considered full/empty.
 
 ENERGY_FULL_DESIGN, ENERGY_EMPTY_DESIGN
   same as above but for energy.
 
 CHARGE_FULL, CHARGE_EMPTY
-  These attributes means "last remembered value of charge when battery
-  became full/empty". It also could mean "value of charge when battery
+  These attributes mean "last remembered value of charge when battery
+  became full/empty". They also could mean "value of charge when battery is
   considered full/empty at given conditions (temperature, age)".
-  I.e. these attributes represents real thresholds, not design values.
+  I.e., these attributes represents real thresholds, not design values.
 
 ENERGY_FULL, ENERGY_EMPTY
   same as above but for energy.
@@ -153,12 +153,12 @@ CHARGE_TERM_CURRENT
 CONSTANT_CHARGE_CURRENT
   constant charge current programmed by charger.
 
-
 CONSTANT_CHARGE_CURRENT_MAX
   maximum charge current supported by the power supply object.
 
 CONSTANT_CHARGE_VOLTAGE
   constant charge voltage programmed by charger.
+
 CONSTANT_CHARGE_VOLTAGE_MAX
   maximum charge voltage supported by the power supply object.
 
@@ -208,10 +208,10 @@ TEMP_MAX
 
 TIME_TO_EMPTY
   seconds left for battery to be considered empty
-  (i.e. while battery powers a load)
+  (i.e., while battery powers a load)
 TIME_TO_FULL
   seconds left for battery to be considered full
-  (i.e. while battery is charging)
+  (i.e., while battery is charging)
 
 
 Battery <-> external power supply interaction
@@ -220,13 +220,13 @@ Often power supplies are acting as supplies and supplicants at the same
 time. Batteries are good example. So, batteries usually care if they're
 externally powered or not.
 
-For that case, power supply class implements notification mechanism for
+For that case, the power supply class implements a notification mechanism for
 batteries.
 
-External power supply (AC) lists supplicants (batteries) names in
+An external power supply (AC) lists supplicants (batteries) names in
 "supplied_to" struct member, and each power_supply_changed() call
-issued by external power supply will notify supplicants via
-external_power_changed callback.
+issued by an external power supply will notify supplicants via
+the external_power_changed callback.
 
 
 Devicetree battery characteristics
@@ -241,14 +241,14 @@ battery node have names corresponding to elements in enum power_supply_property,
 for naming consistency between sysfs attributes and battery node properties.
 
 
-QA
-~~
+Q&A
+~~~
 
 Q:
    Where is POWER_SUPPLY_PROP_XYZ attribute?
 A:
-   If you cannot find attribute suitable for your driver needs, feel free
-   to add it and send patch along with your driver.
+   If you cannot find an attribute suitable for your driver needs, feel free
+   to add it and send a patch along with your driver.
 
    The attributes available currently are the ones currently provided by the
    drivers written.
@@ -258,18 +258,18 @@ A:
 
 
 Q:
-   I have some very specific attribute (e.g. battery color), should I add
+   I have some very specific attribute (e.g., battery color). Should I add
    this attribute to standard ones?
 A:
    Most likely, no. Such attribute can be placed in the driver itself, if
-   it is useful. Of course, if the attribute in question applicable to
-   large set of batteries, provided by many drivers, and/or comes from
+   it is useful. Of course, if the attribute in question is applicable to
+   a large set of batteries, provided by many drivers, and/or comes from
    some general battery specification/standard, it may be a candidate to
    be added to the core attribute set.
 
 
 Q:
-   Suppose, my battery monitoring chip/firmware does not provides capacity
+   Suppose my battery monitoring chip/firmware does not provide capacity
    in percents, but provides charge_{now,full,empty}. Should I calculate
    percentage capacity manually, inside the driver, and register CAPACITY
    attribute? The same question about time_to_empty/time_to_full.
@@ -278,11 +278,11 @@ A:
    directly measurable by the specific hardware available.
 
    Inferring not available properties using some heuristics or mathematical
-   model is not subject of work for a battery driver. Such functionality
+   model is not a subject of work for a battery driver. Such functionality
    should be factored out, and in fact, apm_power, the driver to serve
-   legacy APM API on top of power supply class, uses a simple heuristic of
+   legacy APM API on top of the power supply class, uses a simple heuristic of
    approximating remaining battery capacity based on its charge, current,
-   voltage and so on. But full-fledged battery model is likely not subject
-   for kernel at all, as it would require floating point calculation to deal
-   with things like differential equations and Kalman filters. This is
+   voltage and so on. But a full-fledged battery model is likely not a subject
+   for the kernel at all, as it would require floating point calculations to
+   deal with things like differential equations and Kalman filters. This is
    better be handled by batteryd/libbattery, yet to be written.