docs: ABI: charge_control_end_threshold may not support all values

Some laptops (for example Toshiba Satellite Z830) only supports some fixed
values. Allow for this and document the expected behaviour in such cases.

Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Arvid Norlander <lkml@vorpal.se>
Link: https://lore.kernel.org/r/20220902180037.1728546-4-lkml@vorpal.se
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/Documentation/ABI/testing/sysfs-class-power b/Documentation/ABI/testing/sysfs-class-power
index a9ce63cfbe87c79c98bc34718d79817bbeb5645d..e434fc523291d85b10503c45d394032d7359d086 100644 (file)
--- a/Documentation/ABI/testing/sysfs-class-power
+++ b/Documentation/ABI/testing/sysfs-class-power
@@ -364,7 +364,10 @@ Date:              April 2019
 Contact:       linux-pm@vger.kernel.org
 Description:
                Represents a battery percentage level, above which charging will
-               stop.
+               stop. Not all hardware is capable of setting this to an arbitrary
+               percentage. Drivers will round written values to the nearest
+               supported value. Reading back the value will show the actual
+               threshold set by the driver.
 
                Access: Read, Write