Commit 471dec80 authored by Dan Murphy's avatar Dan Murphy Committed by Sebastian Reichel
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dt-bindings: power: Convert battery.txt to battery.yaml 



Convert the battery.txt file to yaml and fix up the examples.

Signed-off-by: default avatarDan Murphy <dmurphy@ti.com>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
[Fixed the regex for ocv-capacity-table and the DT example for it]
Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
parent 466bf931

Documentation/devicetree/bindings/power/supply/battery.txt

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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.

The contents of this file has been moved to battery.yaml



Please note that not all charger drivers respect all of the properties.
 


Required Properties:

 - compatible: Must be "simple-battery"



Optional Properties:

 - over-voltage-threshold-microvolt: battery over-voltage limit

 - re-charge-voltage-microvolt: limit to automatically start charging again

 - voltage-min-design-microvolt: drained battery voltage

 - voltage-max-design-microvolt: fully charged battery voltage

 - energy-full-design-microwatt-hours: battery design energy

 - charge-full-design-microamp-hours: battery design capacity

 - trickle-charge-current-microamp: current for trickle-charge phase

 - precharge-current-microamp: current for pre-charge phase

 - precharge-upper-limit-microvolt: limit when to change to constant charging

 - 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

 - factory-internal-resistance-micro-ohms: battery factory internal resistance

 - ocv-capacity-table-0: An array providing the open circuit voltage (OCV)

   of the battery and corresponding battery capacity percent, which is used

   to look up battery capacity according to current OCV value. And the open

   circuit voltage unit is microvolt.

 - ocv-capacity-table-1: Same as ocv-capacity-table-0

 ......

 - ocv-capacity-table-n: Same as ocv-capacity-table-0

 - ocv-capacity-celsius: An array containing the temperature in degree Celsius,

   for each of the battery capacity lookup table. The first temperature value

   specifies the OCV table 0, and the second temperature value specifies the

   OCV table 1, and so on.

 - resistance-temp-table: An array providing the temperature in degree Celsius

   and corresponding battery internal resistance percent, which is used to look

   up the resistance percent according to current temperature to get a accurate

   batterty internal resistance in different temperatures.



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>;

		voltage-max-design-microvolt = <4200000>;

		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>;

		factory-internal-resistance-micro-ohms = <250000>;

		ocv-capacity-celsius = <(-10) 0 10>;

		ocv-capacity-table-0 = <4185000 100>, <4113000 95>, <4066000 90>, ...;

		ocv-capacity-table-1 = <4200000 100>, <4185000 95>, <4113000 90>, ...;

		ocv-capacity-table-2 = <4250000 100>, <4200000 95>, <4185000 90>, ...;

		resistance-temp-table = <20 100>, <10 90>, <0 80>, <(-10) 60>;

	};



	charger: charger@11 {

		....

		monitored-battery = <&bat>;

		...

	};



	fuel_gauge: fuel-gauge@22 {

		....

		monitored-battery = <&bat>;

		...

	};

Documentation/devicetree/bindings/power/supply/battery.yaml

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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)

%YAML 1.2

---

$id: http://devicetree.org/schemas/power/supply/battery.yaml#

$schema: http://devicetree.org/meta-schemas/core.yaml#



title: Battery Characteristics



maintainers:

  - Sebastian Reichel <sre@kernel.org>



description: |

  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.



  Battery properties are named, where possible, for the corresponding elements

  in enum power_supply_property, defined in 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".



properties:

  compatible:

    const: simple-battery



  over-voltage-threshold-microvolt:

    description: battery over-voltage limit



  re-charge-voltage-microvolt:

    description: limit to automatically start charging again



  voltage-min-design-microvolt:

    description: drained battery voltage



  voltage-max-design-microvolt:

    description: fully charged battery voltage



  energy-full-design-microwatt-hours:

    description: battery design energy



  charge-full-design-microamp-hours:

    description: battery design capacity



  trickle-charge-current-microamp:

    description: current for trickle-charge phase



  precharge-current-microamp:

    description: current for pre-charge phase



  precharge-upper-limit-microvolt:

    description: limit when to change to constant charging



  charge-term-current-microamp:

    description: current for charge termination phase



  constant-charge-current-max-microamp:

    description: maximum constant input current



  constant-charge-voltage-max-microvolt:

    description: maximum constant input voltage



  factory-internal-resistance-micro-ohms:

    description: battery factory internal resistance



  resistance-temp-table:

    description: |

      An array providing the temperature in degree Celsius

      and corresponding battery internal resistance percent, which is used to

      look up the resistance percent according to current temperature to get an

      accurate batterty internal resistance in different temperatures.



  ocv-capacity-celsius:

    description: |

      An array containing the temperature in degree Celsius,

      for each of the battery capacity lookup table.



required:

  - compatible



patternProperties:

  '^ocv-capacity-table-[0-9]+$':

    $ref: /schemas/types.yaml#/definitions/uint32-matrix

    description: |

      An array providing the open circuit voltage (OCV)

      of the battery and corresponding battery capacity percent, which is used

      to look up battery capacity according to current OCV value. And the open

      circuit voltage unit is microvolt.

    maxItems: 100

    items:

      items:

        - description: open circuit voltage (OCV) in microvolts

        - description: battery capacity percent

          maximum: 100



additionalProperties: false



examples:

  - |

    power {

      #address-cells = <1>;

      #size-cells = <0>;



      battery: battery {

        compatible = "simple-battery";

        over-voltage-threshold-microvolt = <4500000>;

        re-charge-voltage-microvolt = <250000>;

        voltage-min-design-microvolt = <3200000>;

        voltage-max-design-microvolt = <4200000>;

        energy-full-design-microwatt-hours = <5290000>;

        charge-full-design-microamp-hours = <1430000>;

        precharge-current-microamp = <256000>;

        precharge-upper-limit-microvolt = <2500000>;

        charge-term-current-microamp = <128000>;

        constant-charge-current-max-microamp = <900000>;

        constant-charge-voltage-max-microvolt = <4200000>;

        factory-internal-resistance-micro-ohms = <250000>;

        ocv-capacity-celsius = <(-10) 0 10>;

        /* table for -10 degree Celsius */

        ocv-capacity-table-0 = <4185000 100>, <4113000 95>, <4066000 90>;

        /* table for 0 degree Celsius */

        ocv-capacity-table-1 = <4200000 100>, <4185000 95>, <4113000 90>;

        /* table for 10 degree Celsius */

        ocv-capacity-table-2 = <4250000 100>, <4200000 95>, <4185000 90>;

        resistance-temp-table = <20 100>, <10 90>, <0 80>, <(-10) 60>;

      };



      charger@11 {

        reg = <0x11>;

        monitored-battery = <&battery>;

      };



      fuel-gauge@22 {

        reg = <0x22>;

        monitored-battery = <&battery>;

      };

    };

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