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Diffstat (limited to 'Documentation/devicetree/bindings/power/supply/ltc2941.txt')
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diff --git a/Documentation/devicetree/bindings/power/supply/ltc2941.txt b/Documentation/devicetree/bindings/power/supply/ltc2941.txt new file mode 100644 index 000000000..3b9ba147b --- /dev/null +++ b/Documentation/devicetree/bindings/power/supply/ltc2941.txt @@ -0,0 +1,28 @@ +binding for LTC2941, LTC2942, LTC2943 and LTC2944 battery gauges + +All chips measure battery capacity. +The LTC2942 is pin compatible with the LTC2941, it adds voltage and +temperature monitoring, and is runtime detected. LTC2943 and LTC2944 +is software compatible, uses a slightly different conversion formula +for the charge counter and adds voltage, current and temperature monitoring. + +Required properties: +- compatible: Should contain "lltc,ltc2941", "lltc,ltc2942", "lltc,ltc2943" + or "lltc,ltc2944" which also indicates the type of I2C chip attached. +- reg: The 7-bit I2C address. +- lltc,resistor-sense: The sense resistor value in milli-ohms. Can be a 32-bit + negative value when the battery has been connected to the wrong end of the + resistor. +- lltc,prescaler-exponent: The prescaler exponent as explained in the datasheet. + This determines the range and accuracy of the gauge. The value is programmed + into the chip only if it differs from the current setting. The setting is + lost when the battery is disconnected. + +Example from the Topic Miami Florida board: + + fuelgauge: ltc2943@64 { + compatible = "lltc,ltc2943"; + reg = <0x64>; + lltc,resistor-sense = <15>; + lltc,prescaler-exponent = <5>; /* 2^(2*5) = 1024 */ + }; |