Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / clk / clk-devres.c

diff --git a/kernel/drivers/clk/clk-devres.c b/kernel/drivers/clk/clk-devres.c
new file mode 100644 (file)
index 0000000..8f57154
--- /dev/null
+++ b/kernel/drivers/clk/clk-devres.c
@@ -0,0 +1,55 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/export.h>
+#include <linux/gfp.h>
+
+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);
+
+static int devm_clk_match(struct device *dev, void *res, void *data)
+{
+       struct clk **c = res;
+       if (!c || !*c) {
+               WARN_ON(!c || !*c);
+               return 0;
+       }
+       return *c == data;
+}
+
+void devm_clk_put(struct device *dev, struct clk *clk)
+{
+       int ret;
+
+       ret = devres_release(dev, devm_clk_release, devm_clk_match, clk);
+
+       WARN_ON(ret);
+}
+EXPORT_SYMBOL(devm_clk_put);