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In case backend is not ready, ie: fail to wakeup or initialization, on the returning of the I2C_SLAVE_WRITE_REQUESTED event, bus driver should aware the backend status and might auto sending NACK on the next incoming bytes for I2C master to retry. Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com> Links:https://lore.kernel.org/linux-arm-kernel/556fa9e1-c54b-8370-4de7-c2d3ec7d6906@os.amperecomputing.com/ [wsa: made some wording more precise] Signed-off-by: Wolfram Sang <wsa@kernel.org>