serial: sc16is7xx: Fill in rs485_supported

Add information on supported serial_rs485 features.

This driver does not support delay_rts_after_send but the pre-existing
behavior is to return -EINVAL if delay_rts_after_send is non-zero. In
contrast, other drivers that do not support delay_rts_after_send either
zero delay_rts_after_send or do not care (leave the inaccurate value).
As changing this would cause userspace visible impact, the change is
not attempted here. But perhaps it should be still tried (maybe nobody
finds that kind of API oddity significant)?

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220606100433.13793-21-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 8472bf70477ce2fcfaa289031249ce7857ffd6b3..b3162dfe97b1e7ddf04a72a025b72dc967c15302 100644 (file)
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -1354,6 +1354,12 @@ static int sc16is7xx_gpio_direction_output(struct gpio_chip *chip,
 }
 #endif
 
+static const struct serial_rs485 sc16is7xx_rs485_supported = {
+       .flags = SER_RS485_ENABLED | SER_RS485_RTS_AFTER_SEND,
+       .delay_rts_before_send = 1,
+       .delay_rts_after_send = 1,      /* Not supported but keep returning -EINVAL */
+};
+
 static int sc16is7xx_probe(struct device *dev,
                           const struct sc16is7xx_devtype *devtype,
                           struct regmap *regmap, int irq)
@@ -1456,6 +1462,7 @@ static int sc16is7xx_probe(struct device *dev,
                s->p[i].port.iotype     = UPIO_PORT;
                s->p[i].port.uartclk    = freq;
                s->p[i].port.rs485_config = sc16is7xx_config_rs485;
+               s->p[i].port.rs485_supported = &sc16is7xx_rs485_supported;
                s->p[i].port.ops        = &sc16is7xx_ops;
                s->p[i].old_mctrl       = 0;
                s->p[i].port.line       = sc16is7xx_alloc_line();