[2/2] power: supply: ltc2941-battery-gauge: Add support for LTC2942

Commit Message

Ladislav Michl June 12, 2017, 6:07 p.m. UTC

On Mon, Jun 12, 2017 at 06:29:54PM +0200, Mike Looijmans wrote:
> On 12-6-2017 17:04, Ladislav Michl wrote:
> > LTC2942 is pin compatible with LTC2941 providing additional
> > informations about battery voltage and temperature. It can
> > be runtime detected using bit A7 in the Status register.
> 
> Runtime detection is always nice. I'd suggest adding "ltc2942" to the device
> name list, since having to specify "ltc2941" when the chip is in fact an
> "ltc2942" looks a bit strange.

It is not that strange after the one who would otherwise blindly type ltc2942
reads the datasheet ;-)

> Again, no strong preference, whatever the maintainers think is best is fine
> with me also.

What about adding something like this?

Patch

diff --git a/Documentation/devicetree/bindings/power/supply/ltc2941.txt b/Documentation/devicetree/bindings/power/supply/ltc2941.txt
index a9d7aa60558b..0d065d54d294 100644
--- a/Documentation/devicetree/bindings/power/supply/ltc2941.txt
+++ b/Documentation/devicetree/bindings/power/supply/ltc2941.txt
@@ -1,9 +1,10 @@ 
-binding for LTC2941 and LTC2943 battery gauges
+binding for LTC2941, LTC2942 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.
+All chips measure battery capacity.
+The LTC2942 is pin compatible with the LTC2941, it adds voltage and
+temperature monitoring, and is runtime detected. LTC2943 is software
+compatible, uses a slightly different conversion formula for the
+charge counter and adds voltage, current and temperature monitoring.
 
 Required properties:
 - compatible: Should contain "lltc,ltc2941" or "lltc,ltc2943" which also