Maxim max17040 is a fuel gauge from a larger family utilising the Model Gauge technology. Document all different compatible strings that the max17040 driver recognizes. Some devices in the wild report double the capacity. The maxim,double-soc (from State-Of-Charge) property fixes that. Complete device reset might lead to very inaccurate readings. Specify maxim,skip-reset to avoid that. To compensate for the battery chemistry and operating conditions the chips support a compensation value. Specify one or two byte compensation via the maxim,rcomp byte array. Signed-off-by: Iskren Chernev <iskren.chernev@xxxxxxxxx> --- v1: https://lkml.org/lkml/2020/6/8/682 Changes in v2: - add maxim,skip-reset - remove 2 byte rcomp from example, the specified compat string supports 1 byte rcomp .../power/supply/max17040_battery.txt | 24 ++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/power/supply/max17040_battery.txt b/Documentation/devicetree/bindings/power/supply/max17040_battery.txt index 4e0186b8380fa..3ee91c295027f 100644 --- a/Documentation/devicetree/bindings/power/supply/max17040_battery.txt +++ b/Documentation/devicetree/bindings/power/supply/max17040_battery.txt @@ -2,7 +2,9 @@ max17040_battery ~~~~~~~~~~~~~~~~ Required properties : - - compatible : "maxim,max17040" or "maxim,max77836-battery" + - compatible : "maxim,max17040", "maxim,max17041", "maxim,max17043", + "maxim,max17044", "maxim,max17048", "maxim,max17049", + "maxim,max17058", "maxim,max17059" or "maxim,max77836-battery" - reg: i2c slave address Optional properties : @@ -11,6 +13,18 @@ Optional properties : generated. Can be configured from 1 up to 32 (%). If skipped the power up default value of 4 (%) will be used. +- maxim,double-soc : Certain devices return double the capacity. + Specify this boolean property to divide the + reported value in 2 and thus normalize it. + SOC == State of Charge == Capacity. +- maxim,skip-reset : Do not reset device on driver initialization. + Some devices report extremely inaccurately after + a hard reset. +- maxim,rcomp : A value to compensate readings for various + battery chemistries and operating temperatures. + max17040,41 have 2 byte rcomp, default to + 0x97 0x00. All other devices have one byte + rcomp, default to 0x97. - interrupts : Interrupt line see Documentation/devicetree/ bindings/interrupt-controller/interrupts.txt - wakeup-source : This device has wakeup capabilities. Use this @@ -31,3 +45,11 @@ Example: interrupts = <2 IRQ_TYPE_EDGE_FALLING>; wakeup-source; }; + + battery-fuel-gauge@36 { + compatible = "maxim,max17048"; + reg = <0x36>; + maxim,rcomp = /bits/ 8 <0x97>; + maxim,alert-low-soc-level = <10>; + maxim,double-soc; + }; base-commit: 1713116fa907cc7290020f0d8632ec646d2936f8 -- 2.27.0
