Documentation: power: max77693-charger: Document exported sysfs entry

Document the settings exported by max77693 charger driver through sysfs
entries:
 - fast_charge_timer
 - top_off_threshold_current
 - top_off_timer

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>

1 files changed, 42 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-class-power b/Documentation/ABI/testing/sysfs-class-power
index 909e7602c717..369d2a2d7d3e 100644
--- a/Documentation/ABI/testing/sysfs-class-power
+++ b/Documentation/ABI/testing/sysfs-class-power
@@ -32,3 +32,45 @@ Description:
                 Valid values:
                 - 5, 6 or 7 (hours),
                 - 0: disabled.
+
+What:           /sys/class/power_supply/max77693-charger/device/fast_charge_timer
+Date:           January 2015
+KernelVersion:  3.19.0
+Contact:        Krzysztof Kozlowski <k.kozlowski@samsung.com>
+Description:
+                This entry shows and sets the maximum time the max77693
+                charger operates in fast-charge mode. When the timer expires
+                the device will terminate fast-charge mode (charging current
+                will drop to 0 A) and will trigger interrupt.
+
+                Valid values:
+                - 4 - 16 (hours), step by 2 (rounded down)
+                - 0: disabled.
+
+What:           /sys/class/power_supply/max77693-charger/device/top_off_threshold_current
+Date:           January 2015
+KernelVersion:  3.19.0
+Contact:        Krzysztof Kozlowski <k.kozlowski@samsung.com>
+Description:
+                This entry shows and sets the charging current threshold for
+                entering top-off charging mode. When charging current in fast
+                charge mode drops below this value, the charger will trigger
+                interrupt and start top-off charging mode.
+
+                Valid values:
+                - 100000 - 200000 (microamps), step by 25000 (rounded down)
+                - 200000 - 350000 (microamps), step by 50000 (rounded down)
+                - 0: disabled.
+
+What:           /sys/class/power_supply/max77693-charger/device/top_off_timer
+Date:           January 2015
+KernelVersion:  3.19.0
+Contact:        Krzysztof Kozlowski <k.kozlowski@samsung.com>
+Description:
+                This entry shows and sets the maximum time the max77693
+                charger operates in top-off charge mode. When the timer expires
+                the device will terminate top-off charge mode (charging current
+                will drop to 0 A) and will trigger interrupt.
+
+                Valid values:
+                - 0 - 70 (minutes), step by 10 (rounded down)