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Add the necessary documentation for SD2405AL.
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Tóth János <gomba007@gmail.com>
Link: https://lore.kernel.org/r/20240830-rtc-sd2405al-v7-2-2f7102621b1d@gmail.com

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>