clocksource: sh_mtu2: Add clk_prepare/unprepare support

Prepare the clock at probe time, as there is no other appropriate place
in the driver where we're allowed to sleep.

Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/clocksource/sh_mtu2.c b/drivers/clocksource/sh_mtu2.c
index e6cfb328eb2e..3cf12834681e 100644
--- a/drivers/clocksource/sh_mtu2.c
+++ b/drivers/clocksource/sh_mtu2.c
@@ -313,13 +313,18 @@ static int sh_mtu2_setup(struct sh_mtu2_priv *p, struct platform_device *pdev)
                 goto err1;
         }
 
+        ret = clk_prepare(p->clk);
+        if (ret < 0)
+                goto err2;
+
         ret = sh_mtu2_register(p, (char *)dev_name(&p->pdev->dev),
                                cfg->clockevent_rating);
         if (ret < 0)
-                goto err2;
+                goto err3;
 
         return 0;
-
+ err3:
+        clk_unprepare(p->clk);
  err2:
         clk_put(p->clk);
  err1: