[PATCH v3 5/5] serial: 8250_dw: add em485 support

Heiko Stuebner
2020-05-17T21:56:40Z

From: Giulio Benetti <giulio.benetti@micronovasrl.com>

Need to use rs485 transceiver so let's use existing em485 485 emulation
layer on top of 8250.

Add rs485_config callback to port and uses the standard em485 start and
stop helpers.

Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
[moved to use newly added start/stop helpers]
Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
---
drivers/tty/serial/8250/8250_dw.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 51a7d3b19b39..36d364268a45 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -415,6 +415,9 @@ static int dw8250_probe(struct platform_device *pdev)
p->serial_out = dw8250_serial_out;
p->set_ldisc = dw8250_set_ldisc;
p->set_termios = dw8250_set_termios;
+ p->rs485_config = serial8250_em485_config;
+ up->rs485_start_tx = serial8250_em485_start_tx;
+ up->rs485_stop_tx = serial8250_em485_stop_tx;

p->membase = devm_ioremap(dev, regs->start, resource_size(regs));
if (!p->membase)
--
2.25.1