linux-kernel - [PATCH v2 6/9] serial: sc16is7xx: add support for rs485 RTS delays in microseconds

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Date:   Thu, 21 Feb 2019 18:17:55 +0100
From:   Martin Kepplinger <martin.kepplinger@...zinger.com>
To:     <gregkh@...uxfoundation.org>, <robh+dt@...nel.org>,
        <mark.rutland@....com>, <jslaby@...e.com>, <corbet@....net>,
        <richard.genoud@...il.com>, <nicolas.ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>, <ludovic.desroches@...rochip.com>,
        <mcoquelin.stm32@...il.com>, <alexandre.torgue@...com>,
        <linux-serial@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>
CC:     <linux-kernel@...r.kernel.org>,
        Martin Kepplinger <martin.kepplinger@...zinger.com>
Subject: [PATCH v2 6/9] serial: sc16is7xx: add support for rs485 RTS delays in microseconds

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

Signed-off-by: Martin Kepplinger <martin.kepplinger@...zinger.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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