serial: uartps: Add support for cts-override
Having flow is configurable. Add support for the same by
checking for cts-override.
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 74089f5..605354f 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -193,6 +193,7 @@ struct cdns_uart {
int id;
struct notifier_block clk_rate_change_nb;
u32 quirks;
+ bool cts_override;
};
struct cdns_platform_data {
u32 quirks;
@@ -1000,6 +1001,11 @@ static void cdns_uart_config_port(struct uart_port *port, int flags)
*/
static unsigned int cdns_uart_get_mctrl(struct uart_port *port)
{
+ struct cdns_uart *cdns_uart_data = port->private_data;
+
+ if (cdns_uart_data->cts_override)
+ return 0;
+
return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
}
@@ -1007,6 +1013,10 @@ static void cdns_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
u32 val;
u32 mode_reg;
+ struct cdns_uart *cdns_uart_data = port->private_data;
+
+ if (cdns_uart_data->cts_override)
+ return;
val = readl(port->membase + CDNS_UART_MODEMCR);
mode_reg = readl(port->membase + CDNS_UART_MR);
@@ -1665,6 +1675,8 @@ static int cdns_uart_probe(struct platform_device *pdev)
console_port = NULL;
#endif
+ cdns_uart_data->cts_override = of_property_read_bool(pdev->dev.of_node,
+ "cts-override");
return 0;
err_out_pm_disable:
