ARM: OMAP: Add a tag for preferring the STI console.

Presently we have OMAP_TAG_SERIAL_CONSOLE that wraps in to
add_preferred_console() for the serial console, this does the same
thing with OMAP_TAG_STI_CONSOLE so it's selectable who gets tty
control.
Signed-off-by: Paul Mundt <paul.mundt@nokia.com>

arch/arm/plat-omap/sti/sti-console.c

@@ -15,12 +15,13 @@
 #include <linux/tty.h>
 #include <linux/tty_driver.h>
 #include <asm/arch/sti.h>
+#include <asm/arch/board.h>
 
 #define DRV_NAME "sticon"
 
 static struct tty_driver *tty_driver;
 static DEFINE_SPINLOCK(sti_console_lock);
-static unsigned int sti_console_channel = 32;
+static unsigned int sti_console_channel;
 static int sti_line_done = -1;
 
 /*
@@ -132,6 +133,16 @@ static struct console sti_console = {
 
 static int __init sti_console_init(void)
 {
+	const struct omap_sti_console_config *info;
+
+	info = omap_get_config(OMAP_TAG_STI_CONSOLE,
+			       struct omap_sti_console_config);
+	if (info && info->enable) {
+		add_preferred_console(DRV_NAME, 0, NULL);
+
+		sti_console_channel = info->channel;
+	}
+
 	register_console(&sti_console);
 	return 0;
 }

include/asm-arm/arch-omap/board.h

@@ -21,6 +21,7 @@
 #define OMAP_TAG_LCD		0x4f05
 #define OMAP_TAG_GPIO_SWITCH	0x4f06
 #define OMAP_TAG_UART		0x4f07
+#define OMAP_TAG_STI_CONSOLE	0x4f09
 
 #define OMAP_TAG_BOOT_REASON    0x4f80
 #define OMAP_TAG_FLASH_PART	0x4f81
@@ -55,6 +56,11 @@ struct omap_serial_console_config {
 	u32 console_speed;
 };
 
+struct omap_sti_console_config {
+	unsigned enable:1;
+	u8 channel;
+};
+
 struct omap_usb_config {
 	/* Configure drivers according to the connectors on your board:
 	 *  - "A" connector (rectagular)