To determine if a clk has been previously enabled, provide a public
clk_is_enabled function. This is especially helpful to check the state
of clk-gate without actually changing the state of the gate.
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselba...@gmail.com>
---
Cc: Mike Turquette <mturque...@linaro.org>
Cc: Russell King <li...@arm.linux.org.uk>
Cc: Jason Cooper <ja...@lakedaemon.net>
Cc: Andrew Lunn <and...@lunn.ch>
Cc: Grant Likely <grant.lik...@linaro.org>
Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org>
Cc: Jason Gunthorpe <jguntho...@obsidianresearch.com>
Cc: Ezequiel Garcia <ezequiel.gar...@free-electrons.com>
Cc: linux-arm-ker...@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
---
drivers/clk/clk.c | 18 ++++++++++++++++++
include/linux/clk.h | 13 +++++++++++++
2 files changed, 31 insertions(+)
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index a004769..26698d3 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -929,6 +929,24 @@ int clk_enable(struct clk *clk)
EXPORT_SYMBOL_GPL(clk_enable);
/**
+ * clk_is_enabled - return the enabled state of a clk
+ * @clk: the clk whose enabled state gets returned
+ *
+ * Returns true if the clock is enabled, false otherwise.
+ */
+bool clk_is_enabled(struct clk *clk)
+{
+ bool is_en;
+
+ clk_prepare_lock();
+ is_en = __clk_is_enabled(clk);
+ clk_prepare_unlock();
+
+ return is_en;
+}
+EXPORT_SYMBOL_GPL(clk_is_enabled);
+
+/**
* __clk_round_rate - round the given rate for a clk
* @clk: round the rate of this clock
* @rate: the rate which is to be rounded
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 9a6d045..8cbf2f7 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -187,6 +187,14 @@ int clk_enable(struct clk *clk);
void clk_disable(struct clk *clk);
/**
+ * clk_is_enabled - return the enabled state of a clk
+ * @clk: the clk whose enabled state gets returned
+ *
+ * Returns true if the clock is enabled, false otherwise.
+ */
+bool clk_is_enabled(struct clk *clk);
+
+/**
* clk_get_rate - obtain the current clock rate (in Hz) for a clock source.
* This is only valid once the clock source has been enabled.
* @clk: clock source
@@ -299,6 +307,11 @@ static inline int clk_enable(struct clk *clk)
static inline void clk_disable(struct clk *clk) {}
+static inline bool clk_is_enabled(struct clk *clk)
+{
+ return false;
+}
+
static inline unsigned long clk_get_rate(struct clk *clk)
{
return 0;
--
1.7.10.4
--
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