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