Hi, On Thu, Jun 18, 2020 at 01:13:39PM +0300, Iskren Chernev wrote: > 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. Can this be derived from the compatible? > +- maxim,skip-reset : Do not reset device on driver initialization. > + Some devices report extremely inaccurately after > + a hard reset. Same question. -- Sebastian > +- 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 >
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