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