RS485: fix inconsistencies in the meaning of some variables
The crisv10.c and the atmel_serial.c serial drivers intepret the fields of the
serial_rs485 structure in a different way.
In particular, crisv10.c uses SER_RS485_RTS_AFTER_SEND and
SER_RS485_RTS_ON_SEND for the voltage of the RTS pin; atmel_serial.c,
instead, uses these values to know if a delay must be set before and
after sending. This patch makes the usage of these variables consistent
across all drivers and fixes the Documentation as well.
From now on, SER_RS485_RTS_AFTER_SEND and SER_RS485_RTS_ON_SEND will be
used to set the voltage of the RTS pin (as in the crisv10.c driver); the
delay will be understood by looking only at the value of
delay_rts_before_send and delay_rts_after_send.
Signed-off-by: Claudio Scordino <claudio@evidence.eu.com>
Signed-off-by: Darron Black <darron@griffin.net>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 4a0f86f..4c823f3 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -228,7 +228,7 @@
if (rs485conf->flags & SER_RS485_ENABLED) {
dev_dbg(port->dev, "Setting UART to RS485\n");
atmel_port->tx_done_mask = ATMEL_US_TXEMPTY;
- if (rs485conf->flags & SER_RS485_RTS_AFTER_SEND)
+ if ((rs485conf->delay_rts_after_send) > 0)
UART_PUT_TTGR(port, rs485conf->delay_rts_after_send);
mode |= ATMEL_US_USMODE_RS485;
} else {
@@ -304,7 +304,7 @@
if (atmel_port->rs485.flags & SER_RS485_ENABLED) {
dev_dbg(port->dev, "Setting UART to RS485\n");
- if (atmel_port->rs485.flags & SER_RS485_RTS_AFTER_SEND)
+ if ((atmel_port->rs485.delay_rts_after_send) > 0)
UART_PUT_TTGR(port,
atmel_port->rs485.delay_rts_after_send);
mode |= ATMEL_US_USMODE_RS485;
@@ -1228,7 +1228,7 @@
if (atmel_port->rs485.flags & SER_RS485_ENABLED) {
dev_dbg(port->dev, "Setting UART to RS485\n");
- if (atmel_port->rs485.flags & SER_RS485_RTS_AFTER_SEND)
+ if ((atmel_port->rs485.delay_rts_after_send) > 0)
UART_PUT_TTGR(port,
atmel_port->rs485.delay_rts_after_send);
mode |= ATMEL_US_USMODE_RS485;
@@ -1447,16 +1447,6 @@
rs485conf->delay_rts_after_send = rs485_delay[1];
rs485conf->flags = 0;
- if (rs485conf->delay_rts_before_send == 0 &&
- rs485conf->delay_rts_after_send == 0) {
- rs485conf->flags |= SER_RS485_RTS_ON_SEND;
- } else {
- if (rs485conf->delay_rts_before_send)
- rs485conf->flags |= SER_RS485_RTS_BEFORE_SEND;
- if (rs485conf->delay_rts_after_send)
- rs485conf->flags |= SER_RS485_RTS_AFTER_SEND;
- }
-
if (of_get_property(np, "rs485-rx-during-tx", NULL))
rs485conf->flags |= SER_RS485_RX_DURING_TX;