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 74089f5e5b53b69e82d0eae0b0d075ccbd106428..605354fd60b1c5a110ecb4f4a46785a64980a211 100644 (file)
--- 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: