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Subject[PATCH v2 1/2] dt-bindings: power: supply: Document max17040 extensions
Date
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@gmail.com>
---
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

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