Merge tag 'rdma-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland...

[firefly-linux-kernel-4.4.55.git] / include / linux / clk.h

diff --git a/include/linux/clk.h b/include/linux/clk.h
index c7f258a81761d22b1b204654d3582af55044915a..8381bbfbc3085bcde157c02ea7234826f757a1e8 100644 (file)
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -301,6 +301,46 @@ 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
@@ -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;