debug_uart: Adjust the declaration of debug_uart_init()

We want to be able to add other common code to this function. So change the
driver's version to have an underscore before it, just like
_debug_uart_putc(). Define debug_uart_init() to call this version.

Update all drivers to this new method.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

drivers/serial/ns16550.c

@@ -257,7 +257,7 @@ int NS16550_tstc(NS16550_t com_port)
 			(1 << CONFIG_DEBUG_UART_SHIFT), \
 		CONFIG_DEBUG_UART_SHIFT)
 
-void debug_uart_init(void)
+static inline void _debug_uart_init(void)
 {
 	struct NS16550 *com_port = (struct NS16550 *)CONFIG_DEBUG_UART_BASE;
 	int baud_divisor;

drivers/serial/serial_efi.c

@@ -107,7 +107,7 @@ static int serial_efi_pending(struct udevice *dev, bool input)
  * There is nothing to init here since the EFI console is already running by
  * the time we enter U-Boot.
  */
-void debug_uart_init(void)
+static inline void _debug_uart_init(void)
 {
 }
 

drivers/serial/serial_s5p.c

@@ -207,7 +207,7 @@ U_BOOT_DRIVER(serial_s5p) = {
 
 #include <debug_uart.h>
 
-void debug_uart_init(void)
+static inline void _debug_uart_init(void)
 {
 	struct s5p_uart *uart = (struct s5p_uart *)CONFIG_DEBUG_UART_BASE;
 

include/debug_uart.h

@@ -38,7 +38,7 @@
  * To enable the debug UART in your serial driver:
  *
  * - #include <debug_uart.h>
- * - Define debug_uart_init(), trying to avoid using the stack
+ * - Define _debug_uart_init(), trying to avoid using the stack
  * - Define _debug_uart_putc() as static inline (avoiding stack usage)
  * - Immediately afterwards, add DEBUG_UART_FUNCS to define the rest of the
  *     functionality (printch(), etc.)
@@ -132,6 +132,11 @@ void printhex8(uint value);
 	void printhex8(uint value) \
 	{ \
 		printhex(value, 8); \
-	}
+	} \
+\
+	void debug_uart_init(void) \
+	{ \
+		_debug_uart_init(); \
+	} \
 
 #endif

lib/efi/efi_stub.c

@@ -59,7 +59,7 @@ struct __packed desctab_info {
  * considering if we start needing more U-Boot functionality. Note that we
  * could then move get_codeseg32() to arch/x86/cpu/cpu.c.
  */
-void debug_uart_init(void)
+void _debug_uart_init(void)
 {
 }