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-rw-r--r--Documentation/power_supply_class.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/power_supply_class.txt b/Documentation/power_supply_class.txt
index a032c316b3b..a8686e5a685 100644
--- a/Documentation/power_supply_class.txt
+++ b/Documentation/power_supply_class.txt
@@ -87,6 +87,10 @@ batteries use voltage for very approximated calculation of capacity.
Battery driver also can use this attribute just to inform userspace
about maximal and minimal voltage thresholds of a given battery.
+VOLTAGE_MAX, VOLTAGE_MIN - same as _DESIGN voltage values except that
+these ones should be used if hardware could only guess (measure and
+retain) the thresholds of a given power supply.
+
CHARGE_FULL_DESIGN, CHARGE_EMPTY_DESIGN - design charge values, when
battery considered full/empty.