clkdev: add possibility to get a clock based on the device name

This adds clk_get_sys to get a clock without the associated struct
device.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

diff --git a/arch/arm/common/clkdev.c b/arch/arm/common/clkdev.c
index 1037bba18329ec6f15cce8d3388cb9ea1d79748e..5589444ff4376bc88f3e37b4042cf03f000548cd 100644 (file)
--- a/arch/arm/common/clkdev.c
+++ b/arch/arm/common/clkdev.c
@@ -62,9 +62,8 @@ static struct clk *clk_find(const char *dev_id, const char *con_id)
        return clk;
 }
 
-struct clk *clk_get(struct device *dev, const char *con_id)
+struct clk *clk_get_sys(const char *dev_id, const char *con_id)
 {
-       const char *dev_id = dev ? dev_name(dev) : NULL;
        struct clk *clk;
 
        mutex_lock(&clocks_mutex);
@@ -75,6 +74,14 @@ struct clk *clk_get(struct device *dev, const char *con_id)
 
        return clk ? clk : ERR_PTR(-ENOENT);
 }
+EXPORT_SYMBOL(clk_get_sys);
+
+struct clk *clk_get(struct device *dev, const char *con_id)
+{
+       const char *dev_id = dev ? dev_name(dev) : NULL;
+
+       return clk_get_sys(dev_id, con_id);
+}
 EXPORT_SYMBOL(clk_get);
 
 void clk_put(struct clk *clk)

diff --git a/include/linux/clk.h b/include/linux/clk.h
index 778777316ea4bc3747983e2c9ed60ed5e1d321dc..1db9bbf444a302f5cf18b31257789d5daa9709a2 100644 (file)
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -125,4 +125,21 @@ int clk_set_parent(struct clk *clk, struct clk *parent);
  */
 struct clk *clk_get_parent(struct clk *clk);
 
+/**
+ * clk_get_sys - get a clock based upon the device name
+ * @dev_id: device name
+ * @con_id: connection ID
+ *
+ * Returns a struct clk corresponding to the clock producer, or
+ * valid IS_ERR() condition containing errno.  The implementation
+ * uses @dev_id and @con_id to determine the clock consumer, and
+ * thereby the clock producer. In contrast to clk_get() this function
+ * takes the device name instead of the device itself for identification.
+ *
+ * Drivers must assume that the clock source is not enabled.
+ *
+ * clk_get_sys should not be called from within interrupt context.
+ */
+struct clk *clk_get_sys(const char *dev_id, const char *con_id);
+
 #endif