| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | # SPDX-License-Identifier: GPL-2.0 |
| 2 | %YAML 1.2 |
| 3 | --- |
| 4 | $id: http://devicetree.org/schemas/power/supply/gpio-charger.yaml# |
| 5 | $schema: http://devicetree.org/meta-schemas/core.yaml# |
| 6 | |
| 7 | title: simple battery chargers only communicating through GPIOs |
| 8 | |
| 9 | maintainers: |
| 10 | - Sebastian Reichel <sre@kernel.org> |
| 11 | |
| 12 | description: |
| 13 | This binding is for all chargers, which are working more or less |
| 14 | autonomously, only providing some status GPIOs and possibly some |
| 15 | GPIOs for limited control over the charging process. |
| 16 | |
| 17 | properties: |
| 18 | compatible: |
| 19 | const: gpio-charger |
| 20 | |
| 21 | charger-type: |
| 22 | enum: |
| 23 | - unknown |
| 24 | - battery |
| 25 | - ups |
| 26 | - mains |
| 27 | - usb-sdp # USB standard downstream port |
| 28 | - usb-dcp # USB dedicated charging port |
| 29 | - usb-cdp # USB charging downstream port |
| 30 | - usb-aca # USB accessory charger adapter |
| 31 | description: |
| 32 | Type of the charger, e.g. "mains" for a wall charger. |
| 33 | |
| 34 | gpios: |
| 35 | maxItems: 1 |
| 36 | description: GPIO indicating the charger presence |
| 37 | |
| 38 | charge-status-gpios: |
| 39 | maxItems: 1 |
| 40 | description: GPIO indicating the charging status |
| 41 | |
| 42 | charge-current-limit-gpios: |
| 43 | minItems: 1 |
| 44 | maxItems: 32 |
| 45 | description: GPIOs used for current limiting |
| 46 | |
| 47 | charge-current-limit-mapping: |
| 48 | description: List of tuples with current in uA and a GPIO bitmap (in |
| 49 | this order). The tuples must be provided in descending order of the |
| 50 | current limit. |
| 51 | $ref: /schemas/types.yaml#/definitions/uint32-matrix |
| 52 | items: |
| 53 | items: |
| 54 | - description: |
| 55 | Current limit in uA |
| 56 | - description: |
| 57 | Encoded GPIO setting. Bit 0 represents last GPIO from the |
| 58 | charge-current-limit-gpios property. Bit 1 second to last |
| 59 | GPIO and so on. |
| 60 | |
| 61 | required: |
| 62 | - compatible |
| 63 | |
| 64 | anyOf: |
| 65 | - required: |
| 66 | - gpios |
| 67 | - required: |
| 68 | - charge-status-gpios |
| 69 | - required: |
| 70 | - charge-current-limit-gpios |
| 71 | |
| 72 | dependencies: |
| 73 | charge-current-limit-gpios: [ charge-current-limit-mapping ] |
| 74 | charge-current-limit-mapping: [ charge-current-limit-gpios ] |
| 75 | |
| 76 | additionalProperties: false |
| 77 | |
| 78 | examples: |
| 79 | - | |
| 80 | #include <dt-bindings/gpio/gpio.h> |
| 81 | |
| 82 | charger { |
| 83 | compatible = "gpio-charger"; |
| 84 | charger-type = "usb-sdp"; |
| 85 | |
| 86 | gpios = <&gpd 28 GPIO_ACTIVE_LOW>; |
| 87 | charge-status-gpios = <&gpc 27 GPIO_ACTIVE_LOW>; |
| 88 | |
| 89 | charge-current-limit-gpios = <&gpioA 11 GPIO_ACTIVE_HIGH>, |
| 90 | <&gpioA 12 GPIO_ACTIVE_HIGH>; |
| 91 | charge-current-limit-mapping = <2500000 0x00>, // 2.5 A => both GPIOs low |
| 92 | <700000 0x01>, // 700 mA => GPIO A.12 high |
| 93 | <0 0x02>; // 0 mA => GPIO A.11 high |
| 94 | }; |