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serial: 8250: of: Load TX FIFO Threshold from DT

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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>
This commit is contained in:
Thor Thayer 2016-09-22 14:56:15 -05:00 committed by Greg Kroah-Hartman
parent 51311eaacd
commit ffea043965
1 changed files with 7 additions and 0 deletions
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7
drivers/tty/serial/8250/8250_of.c
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@ -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;