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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: Srinivas Kandagatla <srinivas.kandagatla@oss.qualcomm.com>
Reviewed-by: Rob 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: Vinod Koul <vkoul@kernel.org>
master
Srinivas Kandagatla 2025-09-12 09:32:19 +01:00 committed by Vinod Koul
parent 3a86608788
commit 18223eecec
2 changed files with 42 additions and 0 deletions
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33
drivers/of/property.c
View File

@ -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.
*

9
include/linux/of.h
View File

@ -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)
{