power: supply: sbs-battery: add ability to disable charger broadcasts

In certain designs, it is possible to add a battery on a populated i2c
bus without an sbs compliant charger. In that case, the battery will
unnecessarily and sometimes undesirably master the bus trying to write
info in the charger.

It is observed in many occasion that these battery "broadcasts" are even
corrupting other ongoing master to slave communication. I.e. the
multi-master support in the battery is inadequate.

Thankfully, the CHARGER_MODE bit allows designers to disable that SBS
battery behaviour.

This needs to be done once when the battery is first seen on the bus.

Signed-off-by: Jean-Francois Dagenais <jeff.dagenais@gmail.com>
[rebased code]
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/power/supply/sbs_sbs-battery.txt b/Documentation/devicetree/bindings/power/supply/sbs_sbs-battery.txt
index fa5a8b516dbf..a5093ccef5c5 100644
--- a/Documentation/devicetree/bindings/power/supply/sbs_sbs-battery.txt
+++ b/Documentation/devicetree/bindings/power/supply/sbs_sbs-battery.txt
@@ -16,6 +16,7 @@ Optional properties :
    after an external change notification.
  - sbs,battery-detect-gpios : The gpio which signals battery detection and
    a flag specifying its polarity.
+ - sbs,disable-charger-broadcasts: for systems without sbs compliant chargers
 
 Example:
 
@@ -25,4 +26,5 @@ Example:
 		sbs,i2c-retry-count = <2>;
 		sbs,poll-retry-count = <10>;
 		sbs,battery-detect-gpios = <&gpio-controller 122 1>;
+		sbs,disable-charger-broadcasts;
 	}