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Subject[PATCH v2 2/4] mfd: max77620: add documentation for backup battery charging
Adding documentation for 3 new backup battery charging dts
- maxim,backup-battery-charging-current
- maxim,backup-battery-charging-voltage
- maxim,backup-battery-output-resister

Signed-off-by: Mark Zhang <>
.../devicetree/bindings/mfd/max77620.txt | 20 +++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/Documentation/devicetree/bindings/mfd/max77620.txt b/Documentation/devicetree/bindings/mfd/max77620.txt
index 9c16d51cc15b..484b17e4fba5 100644
--- a/Documentation/devicetree/bindings/mfd/max77620.txt
+++ b/Documentation/devicetree/bindings/mfd/max77620.txt
@@ -122,6 +122,26 @@ For DT binding details of different sub modules like GPIO, pincontrol,
regulator, power, please refer respective device-tree binding document
under their respective sub-system directories.

+Backup Battery:
+This sub-node configure charging backup battery of the device. Device has
+support of charging the backup battery. The subnode name is "backup-battery".
+The property for backup-battery child nodes as:
+Presence of this child node will enable the backup battery charging.
+Optional properties:
+ -maxim,backup-battery-charging-current: Charging current setting.
+ The device supports 50/100/200/400/600/800uA.
+ If this property is unavailable then it will
+ charge with 50uA.
+ -maxim,backup-battery-charging-voltage: Charging Voltage Limit Setting.
+ Device supports 2500000/3000000/3300000/350000uV.
+ Default will be set to 2500mV. The voltage will be roundoff
+ to nearest lower side if other than above is configured.
+ -maxim,backup-battery-output-resister: Output resistor on Ohm.
+ Device supports 100/1000/3000/6000 Ohms.
+ Default will be set to 1000 Ohm.
#include <dt-bindings/mfd/max77620.h>
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