serial: omap: Request pins using pinctrl framework

Request pins using pinctrl framework. Only show a warning
on error as some boards set the pins in the bootloader
even if CONFIG_PINCTRL is enabled.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/omap-serial.c

@@ -40,6 +40,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/of.h>
 #include <linux/gpio.h>
+#include <linux/pinctrl/consumer.h>
 
 #include <plat/omap-serial.h>
 
@@ -108,6 +109,7 @@ struct uart_omap_port {
 	u32			latency;
 	u32			calc_latency;
 	struct work_struct	qos_work;
+	struct pinctrl		*pins;
 };
 
 #define to_uart_omap_port(p)	((container_of((p), struct uart_omap_port, port)))
@@ -1377,6 +1379,13 @@ static int __devinit serial_omap_probe(struct platform_device *pdev)
 		goto err_port_line;
 	}
 
+	up->pins = devm_pinctrl_get_select_default(&pdev->dev);
+	if (IS_ERR(up->pins)) {
+		dev_warn(&pdev->dev, "did not get pins for uart%i error: %li\n",
+			 up->port.line, PTR_ERR(up->pins));
+		up->pins = NULL;
+	}
+
 	sprintf(up->name, "OMAP UART%d", up->port.line);
 	up->port.mapbase = mem->start;
 	up->port.membase = devm_ioremap(&pdev->dev, mem->start,