summaryrefslogtreecommitdiff
path: root/include/linux/clk.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/clk.h')
-rw-r--r--include/linux/clk.h45
1 files changed, 45 insertions, 0 deletions
diff --git a/include/linux/clk.h b/include/linux/clk.h
index c7f258a81761..8381bbfbc308 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -302,6 +302,46 @@ long clk_round_rate(struct clk *clk, unsigned long rate);
int clk_set_rate(struct clk *clk, unsigned long rate);
/**
+ * clk_has_parent - check if a clock is a possible parent for another
+ * @clk: clock source
+ * @parent: parent clock source
+ *
+ * This function can be used in drivers that need to check that a clock can be
+ * the parent of another without actually changing the parent.
+ *
+ * Returns true if @parent is a possible parent for @clk, false otherwise.
+ */
+bool clk_has_parent(struct clk *clk, struct clk *parent);
+
+/**
+ * clk_set_rate_range - set a rate range for a clock source
+ * @clk: clock source
+ * @min: desired minimum clock rate in Hz, inclusive
+ * @max: desired maximum clock rate in Hz, inclusive
+ *
+ * Returns success (0) or negative errno.
+ */
+int clk_set_rate_range(struct clk *clk, unsigned long min, unsigned long max);
+
+/**
+ * clk_set_min_rate - set a minimum clock rate for a clock source
+ * @clk: clock source
+ * @rate: desired minimum clock rate in Hz, inclusive
+ *
+ * Returns success (0) or negative errno.
+ */
+int clk_set_min_rate(struct clk *clk, unsigned long rate);
+
+/**
+ * clk_set_max_rate - set a maximum clock rate for a clock source
+ * @clk: clock source
+ * @rate: desired maximum clock rate in Hz, inclusive
+ *
+ * Returns success (0) or negative errno.
+ */
+int clk_set_max_rate(struct clk *clk, unsigned long rate);
+
+/**
* clk_set_parent - set the parent clock source for this clock
* @clk: clock source
* @parent: parent clock source
@@ -374,6 +414,11 @@ static inline long clk_round_rate(struct clk *clk, unsigned long rate)
return 0;
}
+static inline bool clk_has_parent(struct clk *clk, struct clk *parent)
+{
+ return true;
+}
+
static inline int clk_set_parent(struct clk *clk, struct clk *parent)
{
return 0;