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path: root/drivers/tty/serial/sc16is7xx.c
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Diffstat (limited to 'drivers/tty/serial/sc16is7xx.c')
-rw-r--r--drivers/tty/serial/sc16is7xx.c46
1 files changed, 34 insertions, 12 deletions
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index df9a384dfbda..468354ef7baa 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -829,16 +829,32 @@ static void sc16is7xx_set_termios(struct uart_port *port,
}
static int sc16is7xx_config_rs485(struct uart_port *port,
- struct serial_rs485 *rs485)
+ struct serial_rs485 *rs485)
{
- if (port->rs485.flags & SER_RS485_ENABLED)
- sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG,
- SC16IS7XX_EFCR_AUTO_RS485_BIT,
- SC16IS7XX_EFCR_AUTO_RS485_BIT);
- else
- sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG,
- SC16IS7XX_EFCR_AUTO_RS485_BIT,
- 0);
+ const u32 mask = SC16IS7XX_EFCR_AUTO_RS485_BIT |
+ SC16IS7XX_EFCR_RTS_INVERT_BIT;
+ u32 efcr = 0;
+
+ if (rs485->flags & SER_RS485_ENABLED) {
+ bool rts_during_rx, rts_during_tx;
+
+ rts_during_rx = rs485->flags & SER_RS485_RTS_AFTER_SEND;
+ rts_during_tx = rs485->flags & SER_RS485_RTS_ON_SEND;
+
+ efcr |= SC16IS7XX_EFCR_AUTO_RS485_BIT;
+
+ if (!rts_during_rx && rts_during_tx)
+ /* default */;
+ else if (rts_during_rx && !rts_during_tx)
+ efcr |= SC16IS7XX_EFCR_RTS_INVERT_BIT;
+ else
+ dev_err(port->dev,
+ "unsupported RTS signalling on_send:%d after_send:%d - exactly one of RS485 RTS flags should be set\n",
+ rts_during_tx, rts_during_rx);
+ }
+
+ sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG, mask, efcr);
+
port->rs485 = *rs485;
return 0;
@@ -903,9 +919,11 @@ static void sc16is7xx_shutdown(struct uart_port *port)
/* Disable all interrupts */
sc16is7xx_port_write(port, SC16IS7XX_IER_REG, 0);
/* Disable TX/RX */
- sc16is7xx_port_write(port, SC16IS7XX_EFCR_REG,
- SC16IS7XX_EFCR_RXDISABLE_BIT |
- SC16IS7XX_EFCR_TXDISABLE_BIT);
+ sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG,
+ SC16IS7XX_EFCR_RXDISABLE_BIT |
+ SC16IS7XX_EFCR_TXDISABLE_BIT,
+ SC16IS7XX_EFCR_RXDISABLE_BIT |
+ SC16IS7XX_EFCR_TXDISABLE_BIT);
sc16is7xx_power(port, 0);
}
@@ -1048,6 +1066,7 @@ static int sc16is7xx_probe(struct device *dev,
else
return PTR_ERR(s->clk);
} else {
+ clk_prepare_enable(s->clk);
freq = clk_get_rate(s->clk);
}
@@ -1120,6 +1139,9 @@ static int sc16is7xx_probe(struct device *dev,
if (!ret)
return 0;
+ for (i = 0; i < s->uart.nr; i++)
+ uart_remove_one_port(&s->uart, &s->p[i].port);
+
mutex_destroy(&s->mutex);
#ifdef CONFIG_GPIOLIB