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tty: 8250_of: Use software emulated RS485 direction control

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Use software emulated RS485 direction control to provide RS485 API

Currently it is not possible to use rs485 as pointer to
rs485_config struct in struct uart_port is NULL in case we
configure the port through device tree.

Signed-off-by: Heiko Schocher <hs@denx.de>

Link: https://lore.kernel.org/r/20190913050105.1132080-1-hs@denx.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heiko Schocher 2019-09-13 07:01:05 +02:00 committed by Greg Kroah-Hartman
parent 39f8091926
commit 0c11b88883
1 changed files with 31 additions and 0 deletions
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31
drivers/tty/serial/8250/8250_of.c
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@ -48,6 +48,36 @@ static inline void tegra_serial_handle_break(struct uart_port *port)
}
#endif
static int of_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;
}
/*
* Fill a struct uart_port for a given device node
*/
@ -178,6 +208,7 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
port->flags |= UPF_SKIP_TEST;
port->dev = &ofdev->dev;
port->rs485_config = of_8250_rs485_config;
switch (type) {
case PORT_TEGRA: