linux-kernel - [PATCH] clk: provide public clk_is

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Message-Id: <1380881310-24345-1-git-send-email-sebastian.hesselbarth@gmail.com>
Date:	Fri,  4 Oct 2013 12:08:30 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	Mike Turquette <mturquette@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Grant Likely <grant.likely@...aro.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] clk: provide public clk_is_enabled function

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.hesselbarth@...il.com>
---
Cc: Mike Turquette <mturquette@...aro.org>
Cc: Russell King <linux@....linux.org.uk>
Cc: Jason Cooper <jason@...edaemon.net>
Cc: Andrew Lunn <andrew@...n.ch>
Cc: Grant Likely <grant.likely@...aro.org>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.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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