of: add functions to count number of elements in a property (ad54a0cf) · Commits · 戴 / test

drivers/of/base.c

+32 −0

Original line number	Original line	Diff line number	Diff line
	@@ -885,6 +885,38 @@ struct device_node *of_find_node_by_phandle(phandle handle)
	}		}
	EXPORT_SYMBOL(of_find_node_by_phandle);		EXPORT_SYMBOL(of_find_node_by_phandle);

			/**
			* of_property_count_elems_of_size - Count the number of elements in a property
			*
			* @np: device node from which the property value is to be read.
			* @propname: name of the property to be searched.
			* @elem_size: size of the individual element
			*
			* Search for a property in a device node and count the number of elements of
			* size elem_size in it. Returns number of elements on sucess, -EINVAL if the
			* property does not exist or its length does not match a multiple of elem_size
			* and -ENODATA if the property does not have a value.
			*/
			int of_property_count_elems_of_size(const struct device_node *np,
			const char *propname, int elem_size)
			{
			struct property *prop = of_find_property(np, propname, NULL);

			if (!prop)
			return -EINVAL;
			if (!prop->value)
			return -ENODATA;

			if (prop->length % elem_size != 0) {
			pr_err("size of %s in node %s is not a multiple of %d\n",
			propname, np->full_name, elem_size);
			return -EINVAL;
			}

			return prop->length / elem_size;
			}
			EXPORT_SYMBOL_GPL(of_property_count_elems_of_size);

	/**		/**
	* of_find_property_value_of_size		* of_find_property_value_of_size
	*		*

include/linux/of.h

+76 −0

Original line number	Original line	Diff line number	Diff line
	@@ -250,6 +250,8 @@ extern struct device_node *of_find_node_with_property(
	extern struct property of_find_property(const struct device_node np,		extern struct property of_find_property(const struct device_node np,
	const char *name,		const char *name,
	int *lenp);		int *lenp);
			extern int of_property_count_elems_of_size(const struct device_node *np,
			const char *propname, int elem_size);
	extern int of_property_read_u32_index(const struct device_node *np,		extern int of_property_read_u32_index(const struct device_node *np,
	const char *propname,		const char *propname,
	u32 index, u32 *out_value);		u32 index, u32 *out_value);
	@@ -431,6 +433,12 @@ static inline struct device_node *of_find_compatible_node(
	return NULL;		return NULL;
	}		}

			static inline int of_property_count_elems_of_size(const struct device_node *np,
			const char *propname, int elem_size)
			{
			return -ENOSYS;
			}

	static inline int of_property_read_u32_index(const struct device_node *np,		static inline int of_property_read_u32_index(const struct device_node *np,
	const char propname, u32 index, u32 out_value)		const char propname, u32 index, u32 out_value)
	{		{
	@@ -569,6 +577,74 @@ extern int of_node_to_nid(struct device_node *np);
	static inline int of_node_to_nid(struct device_node *device) { return 0; }		static inline int of_node_to_nid(struct device_node *device) { return 0; }
	#endif		#endif

			/**
			* of_property_count_u8_elems - Count the number of u8 elements in a property
			*
			* @np: device node from which the property value is to be read.
			* @propname: name of the property to be searched.
			*
			* Search for a property in a device node and count the number of u8 elements
			* in it. Returns number of elements on sucess, -EINVAL if the property does
			* not exist or its length does not match a multiple of u8 and -ENODATA if the
			* property does not have a value.
			*/
			static inline int of_property_count_u8_elems(const struct device_node *np,
			const char *propname)
			{
			return of_property_count_elems_of_size(np, propname, sizeof(u8));
			}

			/**
			* of_property_count_u16_elems - Count the number of u16 elements in a property
			*
			* @np: device node from which the property value is to be read.
			* @propname: name of the property to be searched.
			*
			* Search for a property in a device node and count the number of u16 elements
			* in it. Returns number of elements on sucess, -EINVAL if the property does
			* not exist or its length does not match a multiple of u16 and -ENODATA if the
			* property does not have a value.
			*/
			static inline int of_property_count_u16_elems(const struct device_node *np,
			const char *propname)
			{
			return of_property_count_elems_of_size(np, propname, sizeof(u16));
			}

			/**
			* of_property_count_u32_elems - Count the number of u32 elements in a property
			*
			* @np: device node from which the property value is to be read.
			* @propname: name of the property to be searched.
			*
			* Search for a property in a device node and count the number of u32 elements
			* in it. Returns number of elements on sucess, -EINVAL if the property does
			* not exist or its length does not match a multiple of u32 and -ENODATA if the
			* property does not have a value.
			*/
			static inline int of_property_count_u32_elems(const struct device_node *np,
			const char *propname)
			{
			return of_property_count_elems_of_size(np, propname, sizeof(u32));
			}

			/**
			* of_property_count_u64_elems - Count the number of u64 elements in a property
			*
			* @np: device node from which the property value is to be read.
			* @propname: name of the property to be searched.
			*
			* Search for a property in a device node and count the number of u64 elements
			* in it. Returns number of elements on sucess, -EINVAL if the property does
			* not exist or its length does not match a multiple of u64 and -ENODATA if the
			* property does not have a value.
			*/
			static inline int of_property_count_u64_elems(const struct device_node *np,
			const char *propname)
			{
			return of_property_count_elems_of_size(np, propname, sizeof(u64));
			}

	/**		/**
	* of_property_read_bool - Findfrom a property		* of_property_read_bool - Findfrom a property
	* @np: device node from which the property value is to be read.		* @np: device node from which the property value is to be read.

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