serial: s5p: Move serial registration from serial_initialize()

Move the registration of s5p_serialN_device ports from default
serial_initialize() into driver specific function called from
serial_initialize(). This slims down the serial_initialize() call
to a bare tracker of all possible serial port registration routines
in U-Boot.

The newly implemented s5p_serial_initialize() function, which is
implemented inside of the serial_s5p driver allows encapsulation
of s5p_serialN_device within the serial_s5p driver itself.

Also, remove the exports of s5p_serialN_device from include/serial.h
as they are no longer needed. This is simply because the implementation of
default_serial_console() is wrapped into the serial_s5p driver and
the default console is picked by CONFIG_SERIAL<N> macro in config file.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Tom Rini <trini@ti.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>

common/serial.c

@@ -43,6 +43,7 @@ static void serial_null(void)
 serial_initfunc(mpc8xx_serial_initialize);
 serial_initfunc(pxa_serial_initialize);
 serial_initfunc(s3c24xx_serial_initialize);
+serial_initfunc(s5p_serial_initialize);
 
 void serial_register(struct serial_device *dev)
 {
@@ -78,12 +79,7 @@ void serial_initialize(void)
 #endif /* CONFIG_SYS_NS16550_SERIAL */
 	pxa_serial_initialize();
 	s3c24xx_serial_initialize();
-#if defined(CONFIG_S5P)
-	serial_register(&s5p_serial0_device);
-	serial_register(&s5p_serial1_device);
-	serial_register(&s5p_serial2_device);
-	serial_register(&s5p_serial3_device);
-#endif
+	s5p_serial_initialize();
 #if defined(CONFIG_MPC512X)
 #if defined(CONFIG_SYS_PSC1)
 	serial_register(&serial1_device);

drivers/serial/serial_s5p.c

@@ -221,3 +221,11 @@ __weak struct serial_device *default_serial_console(void)
 #error "CONFIG_SERIAL? missing."
 #endif
 }
+
+void s5p_serial_initialize(void)
+{
+	serial_register(&s5p_serial0_device);
+	serial_register(&s5p_serial1_device);
+	serial_register(&s5p_serial2_device);
+	serial_register(&s5p_serial3_device);
+}

include/serial.h

@@ -57,13 +57,6 @@ extern struct serial_device uartlite_serial2_device;
 extern struct serial_device uartlite_serial3_device;
 #endif
 
-#if defined(CONFIG_S5P)
-extern struct serial_device s5p_serial0_device;
-extern struct serial_device s5p_serial1_device;
-extern struct serial_device s5p_serial2_device;
-extern struct serial_device s5p_serial3_device;
-#endif
-
 #if defined(CONFIG_OMAP3_ZOOM2)
 extern struct serial_device zoom2_serial_device0;
 extern struct serial_device zoom2_serial_device1;