Unverified Commit fd958299 authored by Ernest Van Hoecke's avatar Ernest Van Hoecke Committed by Mark Brown
Browse files

of: Add of_property_read_u16_index 



There is an of_property_read_u32_index and of_property_read_u64_index.
This patch adds a similar helper for u16.

Signed-off-by: default avatarErnest Van Hoecke <ernest.vanhoecke@toradex.com>
Signed-off-by: default avatarFrancesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: default avatarRob Herring (Arm) <robh@kernel.org>
Reviewed-by: default avatarCharles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20250319142059.46692-2-francesco@dolcini.it


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 4701f33a

drivers/of/property.c

+33 −0
Original line number Diff line number Diff line
@@ -147,6 +147,39 @@ static void *of_find_property_value_of_size(const struct device_node *np, 
	return prop->value;

}



/**

 * of_property_read_u16_index - Find and read a u16 from a multi-value property.

 *

 * @np:		device node from which the property value is to be read.

 * @propname:	name of the property to be searched.

 * @index:	index of the u16 in the list of values

 * @out_value:	pointer to return value, modified only if no error.

 *

 * Search for a property in a device node and read nth 16-bit value from

 * it.

 *

 * Return: 0 on success, -EINVAL if the property does not exist,

 * -ENODATA if property does not have a value, and -EOVERFLOW if the

 * property data isn't large enough.

 *

 * The out_value is modified only if a valid u16 value can be decoded.

 */

int of_property_read_u16_index(const struct device_node *np,

				       const char *propname,

				       u32 index, u16 *out_value)

{

	const u16 *val = of_find_property_value_of_size(np, propname,

					((index + 1) * sizeof(*out_value)),

					0, NULL);



	if (IS_ERR(val))

		return PTR_ERR(val);



	*out_value = be16_to_cpup(((__be16 *)val) + index);

	return 0;

}

EXPORT_SYMBOL_GPL(of_property_read_u16_index);



/**

 * of_property_read_u32_index - Find and read a u32 from a multi-value property.

 *

include/linux/of.h

+9 −0
Original line number Diff line number Diff line
@@ -314,6 +314,9 @@ extern struct property *of_find_property(const struct device_node *np, 
extern bool of_property_read_bool(const struct device_node *np, const char *propname);

extern int of_property_count_elems_of_size(const struct device_node *np,

				const char *propname, int elem_size);

extern int of_property_read_u16_index(const struct device_node *np,

				       const char *propname,

				       u32 index, u16 *out_value);

extern int of_property_read_u32_index(const struct device_node *np,

				       const char *propname,

				       u32 index, u32 *out_value);
@@ -627,6 +630,12 @@ static inline int of_property_count_elems_of_size(const struct device_node *np, 
	return -ENOSYS;

}



static inline int of_property_read_u16_index(const struct device_node *np,

			const char *propname, u32 index, u16 *out_value)

{

	return -ENOSYS;

}



static inline int of_property_read_u32_index(const struct device_node *np,

			const char *propname, u32 index, u32 *out_value)

{