clocksource: sh_tmu: 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, 8 insertions, 1 deletions

diff --git a/drivers/clocksource/sh_tmu.c b/drivers/clocksource/sh_tmu.c
index 15978372c937..63557cda0a7d 100644
--- a/drivers/clocksource/sh_tmu.c
+++ b/drivers/clocksource/sh_tmu.c
@@ -472,6 +472,11 @@ static int sh_tmu_setup(struct sh_tmu_priv *p, struct platform_device *pdev)
                 ret = PTR_ERR(p->clk);
                 goto err1;
         }
+
+        ret = clk_prepare(p->clk);
+        if (ret < 0)
+                goto err2;
+
         p->cs_enabled = false;
         p->enable_count = 0;
 
@@ -479,10 +484,12 @@ static int sh_tmu_setup(struct sh_tmu_priv *p, struct platform_device *pdev)
                               cfg->clockevent_rating,
                               cfg->clocksource_rating);
         if (ret < 0)
-                goto err2;
+                goto err3;
 
         return 0;
 
+ err3:
+        clk_unprepare(p->clk);
  err2:
         clk_put(p->clk);
  err1: