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# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/power/supply/gpio-charger.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: simple battery chargers only communicating through GPIOs
maintainers:
- Sebastian Reichel <sre@kernel.org>
description:
This binding is for all chargers, which are working more or less
autonomously, only providing some status GPIOs and possibly some
GPIOs for limited control over the charging process.
properties:
compatible:
const: gpio-charger
charger-type:
enum:
- unknown
- battery
- ups
- mains
- usb-sdp # USB standard downstream port
- usb-dcp # USB dedicated charging port
- usb-cdp # USB charging downstream port
- usb-aca # USB accessory charger adapter
description:
Type of the charger, e.g. "mains" for a wall charger.
gpios:
maxItems: 1
description: GPIO indicating the charger presence
charge-status-gpios:
maxItems: 1
description: GPIO indicating the charging status
charge-current-limit-gpios:
minItems: 1
maxItems: 32
description: GPIOs used for current limiting
charge-current-limit-mapping:
description: List of tuples with current in uA and a GPIO bitmap (in
this order). The tuples must be provided in descending order of the
current limit.
$ref: /schemas/types.yaml#/definitions/uint32-matrix
items:
items:
- description:
Current limit in uA
- description:
Encoded GPIO setting. Bit 0 represents last GPIO from the
charge-current-limit-gpios property. Bit 1 second to last
GPIO and so on.
required:
- compatible
anyOf:
- required:
- gpios
- required:
- charge-status-gpios
- required:
- charge-current-limit-gpios
dependencies:
charge-current-limit-gpios: [ charge-current-limit-mapping ]
charge-current-limit-mapping: [ charge-current-limit-gpios ]
additionalProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
charger {
compatible = "gpio-charger";
charger-type = "usb-sdp";
gpios = <&gpd 28 GPIO_ACTIVE_LOW>;
charge-status-gpios = <&gpc 27 GPIO_ACTIVE_LOW>;
charge-current-limit-gpios = <&gpioA 11 GPIO_ACTIVE_HIGH>,
<&gpioA 12 GPIO_ACTIVE_HIGH>;
charge-current-limit-mapping = <2500000 0x00>, // 2.5 A => both GPIOs low
<700000 0x01>, // 700 mA => GPIO A.12 high
<0 0x02>; // 0 mA => GPIO A.11 high
};
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