Re: [PATCH -next 1/2] of/address: introduce of_address_count() helper

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Hi,

On 2022/10/1 5:56, Rob Herring wrote:
On Fri, Sep 30, 2022 at 05:08:44PM +0800, Yang Yingliang wrote:
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;
+}
EXPORT?

However, I'd just make this always inline instead.

+
  /**
   * 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);
I'm pretty sure Sparc build is going to break. Sparc has its own
implementation of of_address_to_resource().
Sorry for late replying.

I will make of_address_count() inline in of_address.h in v2, so it will compatible with
Sparc.

Thanks,
Yang
  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


.



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