[ARM] 5536/1: Move clk_add_alias() to arch/arm/common/clkdev.c

This can be used for other arm platforms too as discussed
on the linux-arm-kernel list.

Also check the return value with IS_ERR and return PTR_ERR
as suggested by Russell King.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 18 insertions, 0 deletions

diff --git a/arch/arm/common/clkdev.c b/arch/arm/common/clkdev.c
index 5589444ff437..f37afd9422f3 100644
--- a/arch/arm/common/clkdev.c
+++ b/arch/arm/common/clkdev.c
@@ -135,6 +135,24 @@ struct clk_lookup *clkdev_alloc(struct clk *clk, const char *con_id,
 }
 EXPORT_SYMBOL(clkdev_alloc);
 
+int clk_add_alias(const char *alias, const char *alias_dev_name, char *id,
+	struct device *dev)
+{
+	struct clk *r = clk_get(dev, id);
+	struct clk_lookup *l;
+
+	if (IS_ERR(r))
+		return PTR_ERR(r);
+
+	l = clkdev_alloc(r, alias, alias_dev_name);
+	clk_put(r);
+	if (!l)
+		return -ENODEV;
+	clkdev_add(l);
+	return 0;
+}
+EXPORT_SYMBOL(clk_add_alias);
+
 /*
  * clkdev_drop - remove a clock dynamically allocated
  */