diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index fa99b0063158743c06d3220f00dfd8c8e1669250..9c8624d9c803a669c6bf5aecfcaacd8bb1724504 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -62,12 +62,6 @@ struct sci_port {
 	/* Platform configuration */
 	struct plat_sci_port	*cfg;
 
-	/* Port enable callback */
-	void			(*enable)(struct uart_port *port);
-
-	/* Port disable callback */
-	void			(*disable)(struct uart_port *port);
-
 	/* Break timer */
 	struct timer_list	break_timer;
 	int			break_flag;
@@ -366,6 +360,29 @@ static int sci_probe_regmap(struct plat_sci_port *cfg)
 	return 0;
 }
 
+static void sci_port_enable(struct sci_port *sci_port)
+{
+	if (!sci_port->port.dev)
+		return;
+
+	pm_runtime_get_sync(sci_port->port.dev);
+
+	clk_enable(sci_port->iclk);
+	sci_port->port.uartclk = clk_get_rate(sci_port->iclk);
+	clk_enable(sci_port->fclk);
+}
+
+static void sci_port_disable(struct sci_port *sci_port)
+{
+	if (!sci_port->port.dev)
+		return;
+
+	clk_disable(sci_port->fclk);
+	clk_disable(sci_port->iclk);
+
+	pm_runtime_put_sync(sci_port->port.dev);
+}
+
 #if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
 
 #ifdef CONFIG_CONSOLE_POLL
@@ -651,8 +668,7 @@ static void sci_break_timer(unsigned long data)
 {
 	struct sci_port *port = (struct sci_port *)data;
 
-	if (port->enable)
-		port->enable(&port->port);
+	sci_port_enable(port);
 
 	if (sci_rxd_in(&port->port) == 0) {
 		port->break_flag = 1;
@@ -664,8 +680,7 @@ static void sci_break_timer(unsigned long data)
 	} else
 		port->break_flag = 0;
 
-	if (port->disable)
-		port->disable(&port->port);
+	sci_port_disable(port);
 }
 
 static int sci_handle_errors(struct uart_port *port)
@@ -939,27 +954,6 @@ static int sci_notifier(struct notifier_block *self,
 	return NOTIFY_OK;
 }
 
-static void sci_clk_enable(struct uart_port *port)
-{
-	struct sci_port *sci_port = to_sci_port(port);
-
-	pm_runtime_get_sync(port->dev);
-
-	clk_enable(sci_port->iclk);
-	sci_port->port.uartclk = clk_get_rate(sci_port->iclk);
-	clk_enable(sci_port->fclk);
-}
-
-static void sci_clk_disable(struct uart_port *port)
-{
-	struct sci_port *sci_port = to_sci_port(port);
-
-	clk_disable(sci_port->fclk);
-	clk_disable(sci_port->iclk);
-
-	pm_runtime_put_sync(port->dev);
-}
-
 static int sci_request_irq(struct sci_port *port)
 {
 	int i;
@@ -1537,8 +1531,7 @@ static int sci_startup(struct uart_port *port)
 
 	dev_dbg(port->dev, "%s(%d)\n", __func__, port->line);
 
-	if (s->enable)
-		s->enable(port);
+	sci_port_enable(s);
 
 	ret = sci_request_irq(s);
 	if (unlikely(ret < 0))
@@ -1564,8 +1557,7 @@ static void sci_shutdown(struct uart_port *port)
 	sci_free_dma(port);
 	sci_free_irq(s);
 
-	if (s->disable)
-		s->disable(port);
+	sci_port_disable(s);
 }
 
 static unsigned int sci_scbrr_calc(unsigned int algo_id, unsigned int bps,
@@ -1612,8 +1604,7 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
 	if (likely(baud && port->uartclk))
 		t = sci_scbrr_calc(s->cfg->scbrr_algo_id, baud, port->uartclk);
 
-	if (s->enable)
-		s->enable(port);
+	sci_port_enable(s);
 
 	do {
 		status = sci_in(port, SCxSR);
@@ -1683,8 +1674,7 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
 	if ((termios->c_cflag & CREAD) != 0)
 		sci_start_rx(port);
 
-	if (s->disable)
-		s->disable(port);
+	sci_port_disable(s);
 }
 
 static const char *sci_type(struct uart_port *port)
@@ -1870,8 +1860,6 @@ static int __devinit sci_init_single(struct platform_device *dev,
 		if (IS_ERR(sci_port->fclk))
 			sci_port->fclk = NULL;
 
-		sci_port->enable = sci_clk_enable;
-		sci_port->disable = sci_clk_disable;
 		port->dev = &dev->dev;
 
 		pm_runtime_enable(&dev->dev);
@@ -1950,8 +1938,7 @@ static void serial_console_write(struct console *co, const char *s,
 	struct uart_port *port = &sci_port->port;
 	unsigned short bits;
 
-	if (sci_port->enable)
-		sci_port->enable(port);
+	sci_port_enable(sci_port);
 
 	uart_console_write(port, s, count, serial_console_putchar);
 
@@ -1960,8 +1947,7 @@ static void serial_console_write(struct console *co, const char *s,
 	while ((sci_in(port, SCxSR) & bits) != bits)
 		cpu_relax();
 
-	if (sci_port->disable)
-		sci_port->disable(port);
+	sci_port_disable(sci_port);
 }
 
 static int __devinit serial_console_setup(struct console *co, char *options)
@@ -1993,8 +1979,7 @@ static int __devinit serial_console_setup(struct console *co, char *options)
 	if (unlikely(ret != 0))
 		return ret;
 
-	if (sci_port->enable)
-		sci_port->enable(port);
+	sci_port_enable(sci_port);
 
 	if (options)
 		uart_parse_options(options, &baud, &parity, &bits, &flow);