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| author | Thor Thayer <tthayer@opensource.altera.com> | 2016-09-22 21:56:15 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-27 12:55:49 +0200 |
| commit | ffea043965e4634617485b4d313d6c0099d817f0 (patch) | |
| tree | ec0b2c3bea4bc880dbbd26c5bf40fca4a460c429 /drivers/tty | |
| parent | Documentation: dt: serial: Add TX FIFO threshold parameter (diff) | |
| download | linux-ffea043965e4634617485b4d313d6c0099d817f0.tar.xz linux-ffea043965e4634617485b4d313d6c0099d817f0.zip | |
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: Thor Thayer <tthayer@opensource.altera.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/8250/8250_of.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c index 38963d7bcf84..7a8b5fc81a19 100644 --- a/drivers/tty/serial/8250/8250_of.c +++ b/drivers/tty/serial/8250/8250_of.c @@ -195,6 +195,7 @@ static int of_platform_serial_probe(struct platform_device *ofdev) switch (port_type) { case PORT_8250 ... PORT_MAX_8250: { + u32 tx_threshold; struct uart_8250_port port8250; memset(&port8250, 0, sizeof(port8250)); port8250.port = port; @@ -202,6 +203,12 @@ static int of_platform_serial_probe(struct platform_device *ofdev) if (port.fifosize) port8250.capabilities = UART_CAP_FIFO; + /* Check for TX FIFO threshold & set tx_loadsz */ + if ((of_property_read_u32(ofdev->dev.of_node, "tx-threshold", + &tx_threshold) == 0) && + (tx_threshold < port.fifosize)) + port8250.tx_loadsz = port.fifosize - tx_threshold; + if (of_property_read_bool(ofdev->dev.of_node, "auto-flow-control")) port8250.capabilities |= UART_CAP_AFE; |