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The RTC module contains a kicker mechanism to prevent any spurious writes from changing the register values. To set the time, you must first unlock the TC registers, update them and then lock. Signed-off-by: Dario Binacchi <dariobin@libero.it> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Link: https://lore.kernel.org/r/20210602203805.11494-6-dariobin@libero.it