serial: make serial_stub_* to static functions

Add missing static to serial_stub_puts().

Unexport serial_stub_{getc,tstc} because they are used locally.

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

drivers/serial/serial-uclass.c

@@ -212,27 +212,30 @@ void serial_stdio_init(void)
 {
 }
 
-#if defined(CONFIG_DM_STDIO) && CONFIG_IS_ENABLED(SERIAL_PRESENT)
+#if defined(CONFIG_DM_STDIO)
+
+#if CONFIG_IS_ENABLED(SERIAL_PRESENT)
 static void serial_stub_putc(struct stdio_dev *sdev, const char ch)
 {
 	_serial_putc(sdev->priv, ch);
 }
 #endif
 
-void serial_stub_puts(struct stdio_dev *sdev, const char *str)
+static void serial_stub_puts(struct stdio_dev *sdev, const char *str)
 {
 	_serial_puts(sdev->priv, str);
 }
 
-int serial_stub_getc(struct stdio_dev *sdev)
+static int serial_stub_getc(struct stdio_dev *sdev)
 {
 	return _serial_getc(sdev->priv);
 }
 
-int serial_stub_tstc(struct stdio_dev *sdev)
+static int serial_stub_tstc(struct stdio_dev *sdev)
 {
 	return _serial_tstc(sdev->priv);
 }
+#endif
 
 /**
  * on_baudrate() - Update the actual baudrate when the env var changes

drivers/serial/serial.c

@@ -273,14 +273,14 @@ static void serial_stub_puts(struct stdio_dev *sdev, const char *str)
 	dev->puts(str);
 }
 
-int serial_stub_getc(struct stdio_dev *sdev)
+static int serial_stub_getc(struct stdio_dev *sdev)
 {
 	struct serial_device *dev = sdev->priv;
 
 	return dev->getc();
 }
 
-int serial_stub_tstc(struct stdio_dev *sdev)
+static int serial_stub_tstc(struct stdio_dev *sdev)
 {
 	struct serial_device *dev = sdev->priv;
 

include/common.h

@@ -490,11 +490,6 @@ void	serial_puts   (const char *);
 int	serial_getc   (void);
 int	serial_tstc   (void);
 
-/* These versions take a stdio_dev pointer */
-struct stdio_dev;
-int serial_stub_getc(struct stdio_dev *sdev);
-int serial_stub_tstc(struct stdio_dev *sdev);
-
 /* $(CPU)/speed.c */
 int	get_clocks (void);
 ulong	get_bus_freq  (ulong);