clk: Add devm_clk_get()
Add a resource managed clk_get() to simplify clock usage in
drivers. This allows driver authors to "get and forget" about
their clocks by automatically calling clk_put() when the driver
is detached. This also encourages clock consumers to use the
clk_get() API correctly by passing in a struct device as an
argument.
Change-Id: I1ed53cd3c26c0390fa30cd3c3dca14bcdd59939f
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
index 6db161f..fdff32e 100644
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -83,6 +83,31 @@
}
EXPORT_SYMBOL(clk_get);
+static void devm_clk_release(struct device *dev, void *res)
+{
+ clk_put(*(struct clk **)res);
+}
+
+struct clk *devm_clk_get(struct device *dev, const char *id)
+{
+ struct clk **ptr, *clk;
+
+ ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ clk = clk_get(dev, id);
+ if (!IS_ERR(clk)) {
+ *ptr = clk;
+ devres_add(dev, ptr);
+ } else {
+ devres_free(ptr);
+ }
+
+ return clk;
+}
+EXPORT_SYMBOL(devm_clk_get);
+
void clk_put(struct clk *clk)
{
__clk_put(clk);