serial: 8250_dwlib: Fill in rs485_supported

Add information on supported serial_rs485 features. When the driver is
using em485, take advantage of serial8250_em485_supported.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220606100433.13793-7-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/8250/8250_dwlib.c b/drivers/tty/serial/8250/8250_dwlib.c
index fbabfdd8c7b8f086445fc4b2ec73aa9f81c2154a..120b29519d7430c2e0b75cd7ca3196b35d4cd35a 100644 (file)
--- a/drivers/tty/serial/8250/8250_dwlib.c
+++ b/drivers/tty/serial/8250/8250_dwlib.c
@@ -149,6 +149,11 @@ static bool dw8250_detect_rs485_hw(struct uart_port *p)
        return reg;
 }
 
+static const struct serial_rs485 dw8250_rs485_supported = {
+       .flags = SER_RS485_ENABLED | SER_RS485_RX_DURING_TX | SER_RS485_RTS_ON_SEND |
+                SER_RS485_RTS_AFTER_SEND,
+};
+
 void dw8250_setup_port(struct uart_port *p)
 {
        struct dw8250_port_data *pd = p->private_data;
@@ -159,8 +164,10 @@ void dw8250_setup_port(struct uart_port *p)
        pd->hw_rs485_support = dw8250_detect_rs485_hw(p);
        if (pd->hw_rs485_support) {
                p->rs485_config = dw8250_rs485_config;
+               p->rs485_supported = &dw8250_rs485_supported;
        } else {
                p->rs485_config = serial8250_em485_config;
+               p->rs485_supported = &serial8250_em485_supported;
                up->rs485_start_tx = serial8250_em485_start_tx;
                up->rs485_stop_tx = serial8250_em485_stop_tx;
        }