serial: 8250_exar: Fill in rs485_supported

[ Upstream commit 59c221f8e1269278161313048c71929c9950b2c4 ]

Add information on supported serial_rs485 features.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220606100433.13793-8-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: 0c2a5f471ce5 ("serial: 8250_exar: Set missing rs485_supported flag")
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
index 0b1976ceb01f71f865e97c0fe074b16f3fc72889..24878d5a6a0500f8afbb557147abc2e7a5130c8b 100644 (file)
--- a/drivers/tty/serial/8250/8250_exar.c
+++ b/drivers/tty/serial/8250/8250_exar.c
@@ -123,6 +123,7 @@ struct exar8250;
 
 struct exar8250_platform {
        int (*rs485_config)(struct uart_port *, struct serial_rs485 *);
+       const struct serial_rs485 *rs485_supported;
        int (*register_gpio)(struct pci_dev *, struct uart_8250_port *);
        void (*unregister_gpio)(struct uart_8250_port *);
 };
@@ -441,10 +442,15 @@ static int generic_rs485_config(struct uart_port *port,
        return 0;
 }
 
+static const struct serial_rs485 generic_rs485_supported = {
+       .flags = SER_RS485_ENABLED,
+};
+
 static const struct exar8250_platform exar8250_default_platform = {
        .register_gpio = xr17v35x_register_gpio,
        .unregister_gpio = xr17v35x_unregister_gpio,
        .rs485_config = generic_rs485_config,
+       .rs485_supported = &generic_rs485_supported,
 };
 
 static int iot2040_rs485_config(struct uart_port *port,
@@ -480,6 +486,10 @@ static int iot2040_rs485_config(struct uart_port *port,
        return generic_rs485_config(port, rs485);
 }
 
+static const struct serial_rs485 iot2040_rs485_supported = {
+       .flags = SER_RS485_ENABLED | SER_RS485_RX_DURING_TX | SER_RS485_TERMINATE_BUS,
+};
+
 static const struct property_entry iot2040_gpio_properties[] = {
        PROPERTY_ENTRY_U32("exar,first-pin", 10),
        PROPERTY_ENTRY_U32("ngpios", 1),
@@ -508,6 +518,7 @@ static int iot2040_register_gpio(struct pci_dev *pcidev,
 
 static const struct exar8250_platform iot2040_platform = {
        .rs485_config = iot2040_rs485_config,
+       .rs485_supported = &iot2040_rs485_supported,
        .register_gpio = iot2040_register_gpio,
        .unregister_gpio = xr17v35x_unregister_gpio,
 };
@@ -550,6 +561,7 @@ pci_xr17v35x_setup(struct exar8250 *priv, struct pci_dev *pcidev,
 
        port->port.uartclk = baud * 16;
        port->port.rs485_config = platform->rs485_config;
+       port->port.rs485_supported = platform->rs485_supported;
 
        /*
         * Setup the UART clock for the devices on expansion slot to