Introduce of_address_count() helper to count the IO resources
instead of open-coding it.
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
---
drivers/of/address.c | 11 +++++++++++
include/linux/of_address.h | 7 +++++++
2 files changed, 18 insertions(+)
diff --git a/drivers/of/address.c b/drivers/of/address.c
index 96f0a12e507c..e32846a9a8d5 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -848,6 +848,17 @@ int of_address_to_resource(struct device_node *dev, int index,
}
EXPORT_SYMBOL_GPL(of_address_to_resource);
+int of_address_count(struct device_node *np)
+{
+ struct resource res;
+ int count = 0;
+
+ while (of_address_to_resource(np, count, &res) == 0)
+ count++;
+
+ return count;
+}
+
/**
* of_iomap - Maps the memory mapped IO for a given device_node
* @np: the device whose io range will be mapped
diff --git a/include/linux/of_address.h b/include/linux/of_address.h
index 45598dbec269..63027e8f3397 100644
--- a/include/linux/of_address.h
+++ b/include/linux/of_address.h
@@ -43,6 +43,7 @@ extern u64 of_translate_dma_address(struct device_node *dev,
extern u64 of_translate_address(struct device_node *np, const __be32 *addr);
extern int of_address_to_resource(struct device_node *dev, int index,
struct resource *r);
+extern int of_address_count(struct device_node *np);
extern void __iomem *of_iomap(struct device_node *device, int index);
void __iomem *of_io_request_and_map(struct device_node *device,
int index, const char *name);
@@ -127,6 +128,7 @@ static inline bool of_dma_is_coherent(struct device_node *np)
#ifdef CONFIG_OF
extern int of_address_to_resource(struct device_node *dev, int index,
struct resource *r);
+extern int of_address_count(struct device_node *np);
void __iomem *of_iomap(struct device_node *node, int index);
#else
static inline int of_address_to_resource(struct device_node *dev, int index,
@@ -139,6 +141,11 @@ static inline void __iomem *of_iomap(struct device_node *device, int index)
{
return NULL;
}
+
+static inline int of_address_count(struct device_node *np)
+{
+ return 0;
+}
#endif
#define of_range_parser_init of_pci_range_parser_init
--
2.25.1
