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Bastian Krause authored
Some RTCs can be equipped with a chargeable battery or supercap. Every RTC allowing this whose driver's implement it are charged by default. To disable this the trickle-diode-disable flag exists. If a driver did not support charging and some time later one wants to add that feature, there is currently no way to do it without breaking dt backwards compatibility. RTCs on boards without the trickle-diode-disable flag in their device tree would suddenly charge their battery/supercap which is a change in behavior. Change that by introducing aux-voltage-chargeable, not as a flag but as a uint32 enum allowing to set "do not charge" (0) or "charge" (1). This dt property is optional, so we can now distinguish these cases. Care must be taken to support the old behavior for device trees without aux-voltage-chargeable nonetheless to stay compatible. Signed-off-by:
Bastian Krause <bst@pengutronix.de> Signed-off-by:
Alexandre Belloni <alexandre.belloni@bootlin.com> Reviewed-by:
Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20200917183246.19446-2-bst@pengutronix.de
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