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dt-bindings: power: supply: Add battery.txt with simple-battery binding 

Documentation of static battery characteristics that can be defined
for batteries that do not embed this data, which are required by
fuel-gauge and charger chips for proper handling of the battery.

The following properties are defined:
  voltage-min-design-microvolt
  charge-full-design-microamp-hours
  energy-full-design-microwatt-hours
  precharge-current-microamp
  charge-term-current-microamp
  constant-charge-current-max-microamp
  constant-charge-voltage-max-microamp

Property names are derived from corresponding elements in
enum power_supply_property from include/linux/power_supply.h
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/power_supply.h

Cc: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org
Signed-off-by: Matt Ranostay <matt@ranostay.consulting>
Signed-off-by: Liam Breck <kernel@networkimprov.net>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
This commit is contained in:
Liam Breck 2017-06-07 11:37:50 -07:00 committed by Sebastian Reichel
parent e470f96fe9
commit 230670479a
1 changed files with 57 additions and 0 deletions
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Documentation/devicetree/bindings/power/supply/battery.txt Normal file
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Battery Characteristics
The devicetree battery node provides static battery characteristics.
In smart batteries, these are typically stored in non-volatile memory
on a fuel gauge chip. The battery node should be used where there is
no appropriate non-volatile memory, or it is unprogrammed/incorrect.
Upstream dts files should not include battery nodes, unless the battery
represented cannot easily be replaced in the system by one of a
different type. This prevents unpredictable, potentially harmful,
behavior should a replacement that changes the battery type occur
without a corresponding update to the dtb.
Required Properties:
- compatible: Must be "simple-battery"
Optional Properties:
- voltage-min-design-microvolt: drained battery voltage
- energy-full-design-microwatt-hours: battery design energy
- charge-full-design-microamp-hours: battery design capacity
- precharge-current-microamp: current for pre-charge phase
- charge-term-current-microamp: current for charge termination phase
- constant-charge-current-max-microamp: maximum constant input current
- constant-charge-voltage-max-microvolt: maximum constant input voltage
Battery properties are named, where possible, for the corresponding
elements in enum power_supply_property, defined in
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/power_supply.h
Batteries must be referenced by chargers and/or fuel-gauges
using a phandle. The phandle's property should be named
"monitored-battery".
Example:
bat: battery {
compatible = "simple-battery";
voltage-min-design-microvolt = <3200000>;
energy-full-design-microwatt-hours = <5290000>;
charge-full-design-microamp-hours = <1430000>;
precharge-current-microamp = <256000>;
charge-term-current-microamp = <128000>;
constant-charge-current-max-microamp = <900000>;
constant-charge-voltage-max-microvolt = <4200000>;
};
charger: charger@11 {
....
monitored-battery = <&bat>;
...
};
fuel_gauge: fuel-gauge@22 {
....
monitored-battery = <&bat>;
...
};