tty: 8250_omap: Use software emulated RS485 direction control
Use software emulated RS485 direction control to provide RS485 API existed in omap_serial driver. Note that 8250_omap issues interrupt on shift register empty which is single prerequesite for using software emulated RS485. Signed-off-by: Matwey V. Kornilov <matwey@sai.msu.ru> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
e490c9144c
commit
344cee2470
|
@ -697,6 +697,36 @@ static void omap_8250_throttle(struct uart_port *port)
|
|||
pm_runtime_put_autosuspend(port->dev);
|
||||
}
|
||||
|
||||
static int omap_8250_rs485_config(struct uart_port *port,
|
||||
struct serial_rs485 *rs485)
|
||||
{
|
||||
struct uart_8250_port *up = up_to_u8250p(port);
|
||||
|
||||
/* Clamp the delays to [0, 100ms] */
|
||||
rs485->delay_rts_before_send = min(rs485->delay_rts_before_send, 100U);
|
||||
rs485->delay_rts_after_send = min(rs485->delay_rts_after_send, 100U);
|
||||
|
||||
port->rs485 = *rs485;
|
||||
|
||||
/*
|
||||
* Both serial8250_em485_init and serial8250_em485_destroy
|
||||
* are idempotent
|
||||
*/
|
||||
if (rs485->flags & SER_RS485_ENABLED) {
|
||||
int ret = serial8250_em485_init(up);
|
||||
|
||||
if (ret) {
|
||||
rs485->flags &= ~SER_RS485_ENABLED;
|
||||
port->rs485.flags &= ~SER_RS485_ENABLED;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
serial8250_em485_destroy(up);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void omap_8250_unthrottle(struct uart_port *port)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
@ -1146,6 +1176,7 @@ static int omap8250_probe(struct platform_device *pdev)
|
|||
up.port.shutdown = omap_8250_shutdown;
|
||||
up.port.throttle = omap_8250_throttle;
|
||||
up.port.unthrottle = omap_8250_unthrottle;
|
||||
up.port.rs485_config = omap_8250_rs485_config;
|
||||
|
||||
if (pdev->dev.of_node) {
|
||||
const struct of_device_id *id;
|
||||
|
|
Loading…
Reference in a new issue