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The X-Powers AXP20X and AXP22X PMICs have an AC entry to supply power to the board. They have a few registers dedicated to the status of the AC power supply. This adds the DT binding documentation for the AC power supply for AXP20X and AXP22X PMICs. Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>