From 24d3b15a1844e3d2c7f5b0d9c482ece98386ede1 Mon Sep 17 00:00:00 2001 From: Mike Looijmans Date: Tue, 28 Oct 2014 08:08:04 +0100 Subject: [PATCH] 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 Signed-off-by: Sebastian Reichel --- .../devicetree/bindings/power/ltc2941.txt | 27 +++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 Documentation/devicetree/bindings/power/ltc2941.txt diff --git a/Documentation/devicetree/bindings/power/ltc2941.txt b/Documentation/devicetree/bindings/power/ltc2941.txt new file mode 100644 index 000000000000..ea42ae12d924 --- /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 */ + }; -- 2.34.1