of: Provide a function to request and map memory
A call to of_iomap does not request the memory region. This patch adds the
function of_io_request_and_map which requests the memory region before
mapping it.
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Suggested-by: Rob Herring <robh@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
diff --git a/include/linux/of_address.h b/include/linux/of_address.h
index c13b878..fb7b722 100644
--- a/include/linux/of_address.h
+++ b/include/linux/of_address.h
@@ -109,7 +109,12 @@
extern int of_address_to_resource(struct device_node *dev, int index,
struct resource *r);
void __iomem *of_iomap(struct device_node *node, int index);
+void __iomem *of_io_request_and_map(struct device_node *device,
+ int index, char *name);
#else
+
+#include <linux/io.h>
+
static inline int of_address_to_resource(struct device_node *dev, int index,
struct resource *r)
{
@@ -120,6 +125,12 @@
{
return NULL;
}
+
+static inline void __iomem *of_io_request_and_map(struct device_node *device,
+ int index, char *name)
+{
+ return IOMEM_ERR_PTR(-EINVAL);
+}
#endif
#if defined(CONFIG_OF_ADDRESS) && defined(CONFIG_PCI)