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/lltc,ltc294x.yaml#
5 $schema: http://devicetree.org/meta-schemas/co 5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6 6
7 title: LTC2941, LTC2942, LTC2943 and LTC2944 b 7 title: LTC2941, LTC2942, LTC2943 and LTC2944 battery fuel gauges
8 8
9 description: | 9 description: |
10 All chips measure battery capacity. 10 All chips measure battery capacity.
11 The LTC2942 is pin compatible with the LTC29 11 The LTC2942 is pin compatible with the LTC2941, it adds voltage and
12 temperature monitoring, and is runtime detec 12 temperature monitoring, and is runtime detected. LTC2943 and LTC2944
13 are software compatible, uses a slightly dif 13 are software compatible, uses a slightly different conversion formula
14 for the charge counter and adds voltage, cur 14 for the charge counter and adds voltage, current and temperature monitoring.
15 15
16 maintainers: 16 maintainers:
17 - Sebastian Reichel <sre@kernel.org> 17 - Sebastian Reichel <sre@kernel.org>
18 18
19 allOf: 19 allOf:
20 - $ref: power-supply.yaml# 20 - $ref: power-supply.yaml#
21 21
22 properties: 22 properties:
23 compatible: 23 compatible:
24 enum: 24 enum:
25 - lltc,ltc2941 25 - lltc,ltc2941
26 - lltc,ltc2942 26 - lltc,ltc2942
27 - lltc,ltc2943 27 - lltc,ltc2943
28 - lltc,ltc2944 28 - lltc,ltc2944
29 29
30 reg: 30 reg:
31 maxItems: 1 31 maxItems: 1
32 32
33 lltc,resistor-sense: 33 lltc,resistor-sense:
34 $ref: /schemas/types.yaml#/definitions/int 34 $ref: /schemas/types.yaml#/definitions/int32
35 description: | 35 description: |
36 Sense resistor value in milli-ohms. 36 Sense resistor value in milli-ohms.
37 Can be negative value when the battery h 37 Can be negative value when the battery has been connected to the wrong end of the resistor.
38 38
39 lltc,prescaler-exponent: 39 lltc,prescaler-exponent:
40 $ref: /schemas/types.yaml#/definitions/uin 40 $ref: /schemas/types.yaml#/definitions/uint32
41 description: | 41 description: |
42 The prescaler exponent as explained in t 42 The prescaler exponent as explained in the datasheet.
43 This determines the range and accuracy o 43 This determines the range and accuracy of the gauge.
44 The value is programmed into the chip on 44 The value is programmed into the chip only if it differs from the current setting.
45 The setting is lost when the battery is 45 The setting is lost when the battery is disconnected.
46 46
47 required: 47 required:
48 - compatible 48 - compatible
49 - reg 49 - reg
50 - lltc,resistor-sense 50 - lltc,resistor-sense
51 - lltc,prescaler-exponent 51 - lltc,prescaler-exponent
52 52
53 additionalProperties: false 53 additionalProperties: false
54 54
55 examples: 55 examples:
56 - | 56 - |
57 i2c { 57 i2c {
58 #address-cells = <1>; 58 #address-cells = <1>;
59 #size-cells = <0>; 59 #size-cells = <0>;
60 battery@64 { 60 battery@64 {
61 compatible = "lltc,ltc2943"; 61 compatible = "lltc,ltc2943";
62 reg = <0x64>; 62 reg = <0x64>;
63 lltc,resistor-sense = <15>; 63 lltc,resistor-sense = <15>;
64 lltc,prescaler-exponent = <5>; /* 2^(2 64 lltc,prescaler-exponent = <5>; /* 2^(2*5) = 1024 */
65 }; 65 };
66 }; 66 };
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