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author | Mike Looijmans <mike.looijmans@topic.nl> | 2014-10-28 08:08:04 +0100 |
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committer | Sebastian Reichel <sre@kernel.org> | 2015-01-22 03:23:22 +0100 |
commit | 24d3b15a1844e3d2c7f5b0d9c482ece98386ede1 (patch) | |
tree | 7272cddc1f9a1b8e809a987889a25127b71d5788 /Documentation/devicetree/bindings/power | |
parent | 085bc24d1553aae0d8a2b8e5b7c80c7862d0212c (diff) | |
download | op-kernel-dev-24d3b15a1844e3d2c7f5b0d9c482ece98386ede1.zip op-kernel-dev-24d3b15a1844e3d2c7f5b0d9c482ece98386ede1.tar.gz |
Add devicetree binding documentation for the LTC2941/LTC2943 driver
This adds the devicetree binding documentation for the LTC2941 and LTC2943
driver. These are I2C connected battery gas gauge ICs.
Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Diffstat (limited to 'Documentation/devicetree/bindings/power')
-rw-r--r-- | Documentation/devicetree/bindings/power/ltc2941.txt | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/power/ltc2941.txt b/Documentation/devicetree/bindings/power/ltc2941.txt new file mode 100644 index 0000000..ea42ae1 --- /dev/null +++ b/Documentation/devicetree/bindings/power/ltc2941.txt @@ -0,0 +1,27 @@ +binding for LTC2941 and LTC2943 battery gauges + +Both the LTC2941 and LTC2943 measure battery capacity. +The LTC2943 is compatible with the LTC2941, it adds voltage and +temperature monitoring, and uses a slightly different conversion +formula for the charge counter. + +Required properties: +- compatible: Should contain "ltc2941" or "ltc2943" 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 = "ltc2943"; + reg = <0x64>; + lltc,resistor-sense = <15>; + lltc,prescaler-exponent = <5>; /* 2^(2*5) = 1024 */ + }; |