SIFIVE_RX_FIFO_DEPTH  138 drivers/tty/serial/sifive.c #if (SIFIVE_TX_FIFO_DEPTH != SIFIVE_RX_FIFO_DEPTH)
SIFIVE_RX_FIFO_DEPTH  441 drivers/tty/serial/sifive.c 	for (c = SIFIVE_RX_FIFO_DEPTH; c > 0; --c) {