net: ipa: introduce ipa_clock_rate()

Create a new function that returns the current rate of the IPA core
clock.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ipa/ipa_clock.c

@@ -256,6 +256,12 @@ void ipa_clock_put(struct ipa *ipa)
 	mutex_unlock(&clock->mutex);
 }
 
+/* Return the current IPA core clock rate */
+u32 ipa_clock_rate(struct ipa *ipa)
+{
+	return ipa->clock ? (u32)clk_get_rate(ipa->clock->core) : 0;
+}
+
 /* Initialize IPA clocking */
 struct ipa_clock *ipa_clock_init(struct device *dev)
 {

drivers/net/ipa/ipa_clock.h

@@ -10,6 +10,14 @@ struct device;
 
 struct ipa;
 
+/**
+ * ipa_clock_rate() - Return the current IPA core clock rate
+ * @ipa:	IPA structure
+ *
+ * Return: The current clock rate (in Hz), or 0.
+ */
+u32 ipa_clock_rate(struct ipa *ipa);
+
 /**
  * ipa_clock_init() - Initialize IPA clocking
  * @dev:	IPA device