[PATCH 6/9] serial: sc16is7xx: add support for rs485 RTS delays in microseconds

[Martin Kepplinger]

Read struct serial_rs485's flag SER_RS485_DELAY_IN_USEC and apply the delay
accordingly.

Signed-off-by: Martin Kepplinger <martin.kepplin...@ginzinger.com>
---
 drivers/tty/serial/sc16is7xx.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 635178cf3eed..b0e00b9fb177 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -743,7 +743,13 @@ static void sc16is7xx_tx_proc(struct kthread_work *ws)
        struct uart_port *port = &(to_sc16is7xx_one(ws, tx_work)->port);
 
        if ((port->rs485.flags & SER_RS485_ENABLED) &&
-           (port->rs485.delay_rts_before_send > 0))
+           (port->rs485.delay_rts_before_send > 0) &&
+           (port->rs485.flags & SER_RS485_DELAY_IN_USEC))
+               usleep_range(port->rs485.delay_rts_before_send,
+                            port->rs485.delay_rts_before_send);
+       else if ((port->rs485.flags & SER_RS485_ENABLED) &&
+                (port->rs485.delay_rts_before_send > 0) &&
+                !(port->rs485.flags & SER_RS485_DELAY_IN_USEC))
                msleep(port->rs485.delay_rts_before_send);
 
        sc16is7xx_handle_tx(port);
-- 
2.20.1

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