watchdog: sp805_wdt: Add clk_{un}prepare support

clk_{un}prepare() routines are required for required on some platforms to run
part of clk enable/disable() routines from contexts that can schedule.

This patch adds support for these routines in sp805 driver.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/watchdog/sp805_wdt.c b/drivers/watchdog/sp805_wdt.c
index 18d4bcfd1bfc..afcd13676542 100644
--- a/drivers/watchdog/sp805_wdt.c
+++ b/drivers/watchdog/sp805_wdt.c
@@ -130,9 +130,16 @@ static int wdt_config(struct watchdog_device *wdd, bool ping)
         int ret;
 
         if (!ping) {
+                ret = clk_prepare(wdt->clk);
+                if (ret) {
+                        dev_err(&wdt->adev->dev, "clock prepare fail");
+                        return ret;
+                }
+
                 ret = clk_enable(wdt->clk);
                 if (ret) {
                         dev_err(&wdt->adev->dev, "clock enable fail");
+                        clk_unprepare(wdt->clk);
                         return ret;
                 }
         }
@@ -184,6 +191,7 @@ static int wdt_disable(struct watchdog_device *wdd)
         spin_unlock(&wdt->lock);
 
         clk_disable(wdt->clk);
+        clk_unprepare(wdt->clk);
 
         return 0;
 }