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device property: Add helpers to count items in an array 

The usual pattern to allocate the necessary space for an array of properties is
to count them first by calling:

  count = device_property_read_uXX_array(dev, propname, NULL, 0);
  if (count < 0)
	return count;

Introduce helpers device_property_count_uXX() to count items by supplying hard
coded last two parameters to device_property_readXX_array().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Andy Shevchenko 2019-06-13 19:59:51 +03:00 committed by Rafael J. Wysocki
parent be6dc3291e
commit 33ee09cd59
1 changed files with 44 additions and 0 deletions
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44
include/linux/property.h
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@ -148,6 +148,26 @@ static inline int device_property_read_u64(struct device *dev,
return device_property_read_u64_array(dev, propname, val, 1);
}
static inline int device_property_count_u8(struct device *dev, const char *propname)
{
return device_property_read_u8_array(dev, propname, NULL, 0);
}
static inline int device_property_count_u16(struct device *dev, const char *propname)
{
return device_property_read_u16_array(dev, propname, NULL, 0);
}
static inline int device_property_count_u32(struct device *dev, const char *propname)
{
return device_property_read_u32_array(dev, propname, NULL, 0);
}
static inline int device_property_count_u64(struct device *dev, const char *propname)
{
return device_property_read_u64_array(dev, propname, NULL, 0);
}
static inline bool fwnode_property_read_bool(const struct fwnode_handle *fwnode,
const char *propname)
{
@ -178,6 +198,30 @@ static inline int fwnode_property_read_u64(const struct fwnode_handle *fwnode,
return fwnode_property_read_u64_array(fwnode, propname, val, 1);
}
static inline int fwnode_property_count_u8(const struct fwnode_handle *fwnode,
const char *propname)
{
return fwnode_property_read_u8_array(fwnode, propname, NULL, 0);
}
static inline int fwnode_property_count_u16(const struct fwnode_handle *fwnode,
const char *propname)
{
return fwnode_property_read_u16_array(fwnode, propname, NULL, 0);
}
static inline int fwnode_property_count_u32(const struct fwnode_handle *fwnode,
const char *propname)
{
return fwnode_property_read_u32_array(fwnode, propname, NULL, 0);
}
static inline int fwnode_property_count_u64(const struct fwnode_handle *fwnode,
const char *propname)
{
return fwnode_property_read_u64_array(fwnode, propname, NULL, 0);
}
/**
* struct property_entry - "Built-in" device property representation.
* @name: Name of the property.