serial: 8250: of: Load TX FIFO Threshold from DT
Initialize the tx_loadsz parameter from passed in devicetree tx-threshold parameter. The tx_loadsz is calculated as the number of bytes to fill FIFO when tx-threshold is triggered. Signed-off-by: NThor Thayer <tthayer@opensource.altera.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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