Commit 18223eec authored by Srinivas Kandagatla's avatar Srinivas Kandagatla Committed by Vinod Koul
Browse files

of: base: Add of_property_read_u8_index 



Add support for of_property_read_u8_index(), simillar to others
u16 and u32 variants. Having this helper makes the code more tidy in
isome cases, specially when we are parsing multiple of these into
data structures.

Signed-off-by: default avatarSrinivas Kandagatla <srinivas.kandagatla@oss.qualcomm.com>
Reviewed-by: default avatarRob Herring (Arm) <robh@kernel.org>
Tested-by: Alexey Klimov <alexey.klimov@linaro.org> # sm8550
Link: https://patch.msgid.link/20250912083225.228778-2-srinivas.kandagatla@oss.qualcomm.com


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent 3a866087

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_u8_index - Find and read a u8 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 u8 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 8-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 u8 value can be decoded.

 */

int of_property_read_u8_index(const struct device_node *np,

				       const char *propname,

				       u32 index, u8 *out_value)

{

	const u8 *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 = val[index];

	return 0;

}

EXPORT_SYMBOL_GPL(of_property_read_u8_index);



/**

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

 *

include/linux/of.h

+9 −0
Original line number Diff line number Diff line
@@ -316,6 +316,9 @@ 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_u8_index(const struct device_node *np,

				       const char *propname,

				       u32 index, u8 *out_value);

extern int of_property_read_u16_index(const struct device_node *np,

				       const char *propname,

				       u32 index, u16 *out_value);
@@ -646,6 +649,12 @@ static inline int of_property_count_elems_of_size(const struct device_node *np, 
	return -ENOSYS;

}



static inline int of_property_read_u8_index(const struct device_node *np,

			const char *propname, u32 index, u8 *out_value)

{

	return -ENOSYS;

}



static inline int of_property_read_u16_index(const struct device_node *np,

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

{