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a930e52875
use function pointer can avoid define atmel_use_pdc_tx/rx everywhere. (*prepare_rx/tx)() is in setup transfer stage. (*schedule_rx/tx)() is in tasklet schedule stage. (*release_rx/tx)() is used when shutdown the transfer. Signed-off-by: Elen Song <elen.song@atmel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>