serial: sh-sci: Fix module clock refcounting.

This adds the enable/disable hooks for the port clock to sh-sci.

Signed-off-by: dmitry pervushin <dimka@nomadgs.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 9 insertions, 3 deletions

diff --git a/drivers/serial/sh-sci.c b/drivers/serial/sh-sci.c
index 0a34fa9e0733..e5cf57f482cf 100644
--- a/drivers/serial/sh-sci.c
+++ b/drivers/serial/sh-sci.c
@@ -77,6 +77,9 @@ struct sci_port {
         /* Break timer */
         struct timer_list       break_timer;
         int                     break_flag;
+
+        /* Port clock */
+        struct clk              *clk;
 };
 
 #ifdef CONFIG_SH_KGDB
@@ -955,6 +958,8 @@ static int sci_startup(struct uart_port *port)
         if (s->enable)
                 s->enable(port);
 
+        s->clk = clk_get(NULL, "module_clk");
+
         sci_request_irq(s);
         sci_start_tx(port);
         sci_start_rx(port, 1);
@@ -972,6 +977,9 @@ static void sci_shutdown(struct uart_port *port)
 
         if (s->disable)
                 s->disable(port);
+
+        clk_put(s->clk);
+        s->clk = NULL;
 }
 
 static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
@@ -990,9 +998,7 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
                 default:
                 {
 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
-                        struct clk *clk = clk_get(NULL, "module_clk");
-                        t = SCBRR_VALUE(baud, clk_get_rate(clk));
-                        clk_put(clk);
+                        t = SCBRR_VALUE(baud, clk_get_rate(s->clk));
 #else
                         t = SCBRR_VALUE(baud);
 #endif