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Diffstat (limited to 'arch/arm/mach-mxs/clock.c')
-rw-r--r--arch/arm/mach-mxs/clock.c33
1 files changed, 23 insertions, 10 deletions
diff --git a/arch/arm/mach-mxs/clock.c b/arch/arm/mach-mxs/clock.c
index a7093c88e6a..97a6f4acc6c 100644
--- a/arch/arm/mach-mxs/clock.c
+++ b/arch/arm/mach-mxs/clock.c
@@ -74,10 +74,15 @@ static int __clk_enable(struct clk *clk)
return 0;
}
-/* This function increments the reference count on the clock and enables the
- * clock if not already enabled. The parent clock tree is recursively enabled
+/*
+ * The clk_enable/clk_disable could be called by drivers in atomic context,
+ * so they should not really hold mutex. Instead, clk_prepare/clk_unprepare
+ * can hold a mutex, as the pair will only be called in non-atomic context.
+ * Before migrating to common clk framework, we can have __clk_enable and
+ * __clk_disable called in clk_prepare/clk_unprepare with mutex held and
+ * leave clk_enable/clk_disable as the dummy functions.
*/
-int clk_enable(struct clk *clk)
+int clk_prepare(struct clk *clk)
{
int ret = 0;
@@ -90,13 +95,9 @@ int clk_enable(struct clk *clk)
return ret;
}
-EXPORT_SYMBOL(clk_enable);
+EXPORT_SYMBOL(clk_prepare);
-/* This function decrements the reference count on the clock and disables
- * the clock when reference count is 0. The parent clock tree is
- * recursively disabled
- */
-void clk_disable(struct clk *clk)
+void clk_unprepare(struct clk *clk)
{
if (clk == NULL || IS_ERR(clk))
return;
@@ -105,6 +106,18 @@ void clk_disable(struct clk *clk)
__clk_disable(clk);
mutex_unlock(&clocks_mutex);
}
+EXPORT_SYMBOL(clk_unprepare);
+
+int clk_enable(struct clk *clk)
+{
+ return 0;
+}
+EXPORT_SYMBOL(clk_enable);
+
+void clk_disable(struct clk *clk)
+{
+ /* nothing to do */
+}
EXPORT_SYMBOL(clk_disable);
/* Retrieve the *current* clock rate. If the clock itself
@@ -166,7 +179,7 @@ int clk_set_parent(struct clk *clk, struct clk *parent)
return ret;
if (clk->usecount)
- clk_enable(parent);
+ clk_prepare_enable(parent);
mutex_lock(&clocks_mutex);
ret = clk->set_parent(clk, parent);