clk: Extend struct clk to provide information regarding clock rate

This commit extends the struct clk to provide information regarding the
clock rate.
As a result the clock tree traversal is performed at most once, and further
reads are using the cached value.

Signed-off-by: Lukasz Majewski <lukma@denx.de>

diff --git a/include/clk.h b/include/clk.h
index a909b71f1ae442d9544d619b4b56bc5026f0c8ae..d7b937ca7bb1af60c3fe99a329fa18f67c59f9fa 100644 (file)
--- a/include/clk.h
+++ b/include/clk.h
@@ -40,6 +40,7 @@ struct udevice;
  * other clock APIs to identify which clock signal to operate upon.
  *
  * @dev: The device which implements the clock signal.
+ * @rate: The clock rate (in HZ).
  * @id: The clock signal ID within the provider.
  * @data: An optional data field for scenarios where a single integer ID is not
  *       sufficient. If used, it can be populated through an .of_xlate op and
@@ -55,6 +56,7 @@ struct udevice;
  */
 struct clk {
        struct udevice *dev;
+       long long rate; /* in HZ */
        /*
         * Written by of_xlate. In the future, we might add more fields here.
         */