serial: clps711x: Add support for N_IRDA line discipline

This patch replace custom handling of IrDA feature with N_IRDA
line discipline, so IrDA mode can be used with irtty driver.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 12 insertions, 9 deletions

diff --git a/Documentation/devicetree/bindings/serial/cirrus,clps711x-uart.txt b/Documentation/devicetree/bindings/serial/cirrus,clps711x-uart.txt
index 8bbdd21ed6ac..12f3cf834deb 100644
--- a/Documentation/devicetree/bindings/serial/cirrus,clps711x-uart.txt
+++ b/Documentation/devicetree/bindings/serial/cirrus,clps711x-uart.txt
@@ -9,7 +9,6 @@ Required properties:
 
 Optional properties:
 - uart-use-ms: Indicate the UART has modem signal (DCD, DSR, CTS).
-- uart-use-irda: Indicate the UART use IRDA mode.
 
 Note: Each UART port should have an alias correctly numbered
 in "aliases" node.
diff --git a/drivers/tty/serial/clps711x.c b/drivers/tty/serial/clps711x.c
index 4f59f1cb9116..5a931f97aa7c 100644
--- a/drivers/tty/serial/clps711x.c
+++ b/drivers/tty/serial/clps711x.c
@@ -232,6 +232,16 @@ static void uart_clps711x_break_ctl(struct uart_port *port, int break_state)
         writel_relaxed(ubrlcr, port->membase + UBRLCR_OFFSET);
 }
 
+static void uart_clps711x_set_ldisc(struct uart_port *port, int ld)
+{
+        if (!port->line) {
+                struct clps711x_port *s = dev_get_drvdata(port->dev);
+
+                regmap_update_bits(s->syscon, SYSCON_OFFSET, SYSCON1_SIREN,
+                                   (ld == N_IRDA) ? SYSCON1_SIREN : 0);
+        }
+}
+
 static int uart_clps711x_startup(struct uart_port *port)
 {
         struct clps711x_port *s = dev_get_drvdata(port->dev);
@@ -342,6 +352,7 @@ static const struct uart_ops uart_clps711x_ops = {
         .stop_rx        = uart_clps711x_nop_void,
         .enable_ms      = uart_clps711x_nop_void,
         .break_ctl      = uart_clps711x_break_ctl,
+        .set_ldisc      = uart_clps711x_set_ldisc,
         .startup        = uart_clps711x_startup,
         .shutdown       = uart_clps711x_shutdown,
         .set_termios    = uart_clps711x_set_termios,
@@ -482,15 +493,8 @@ static int uart_clps711x_probe(struct platform_device *pdev)
                 if (IS_ERR(s->syscon))
                         return PTR_ERR(s->syscon);
 
-                if (!index) {
-                        bool use_irda;
-
+                if (!index)
                         s->use_ms = of_property_read_bool(np, "uart-use-ms");
-                        use_irda = of_property_read_bool(np, "uart-use-irda");
-                        regmap_update_bits(s->syscon, SYSCON_OFFSET,
-                                           SYSCON1_SIREN,
-                                           use_irda ? SYSCON1_SIREN : 0);
-                }
         }
 
         s->port.line            = index;