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of: Warn when of_property_read_bool() is used on non-boolean properties

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The use of of_property_read_bool() for non-boolean properties is
deprecated. The primary use of it was to test property presence, but
that has been replaced in favor of of_property_present(). With those
uses now fixed, add a warning to discourage new ones.

Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20250109-dt-type-warnings-v1-2-0150e32e716c@kernel.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
This commit is contained in:
Rob Herring (Arm) 2025-01-09 13:42:06 -06:00
parent bb3914101f
commit c141ecc3ce
2 changed files with 33 additions and 18 deletions
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26
drivers/of/property.c
View file

@ -31,6 +31,32 @@
#include "of_private.h"
/**
* of_property_read_bool - Find 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 boolean property in a device node. Usage on non-boolean
* property types is deprecated.
*
* Return: true if the property exists false otherwise.
*/
bool of_property_read_bool(const struct device_node *np, const char *propname)
{
struct property *prop = of_find_property(np, propname, NULL);
/*
* Boolean properties should not have a value. Testing for property
* presence should either use of_property_present() or just read the
* property value and check the returned error code.
*/
if (prop && prop->length)
pr_warn("%pOF: Read of boolean property '%s' with a value.\n", np, propname);
return prop ? true : false;
}
EXPORT_SYMBOL(of_property_read_bool);
/**
* of_graph_is_present() - check graph's presence
* @node: pointer to device_node containing graph port

25
include/linux/of.h
View file

@ -311,6 +311,7 @@ extern struct device_node *of_find_node_with_property(
extern struct property *of_find_property(const struct device_node *np,
const char *name,
int *lenp);
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_u32_index(const struct device_node *np,
@ -615,6 +616,12 @@ static inline struct device_node *of_find_compatible_node(
return NULL;
}
static inline bool of_property_read_bool(const struct device_node *np,
const char *propname)
{
return false;
}
static inline int of_property_count_elems_of_size(const struct device_node *np,
const char *propname, int elem_size)
{
@ -1242,24 +1249,6 @@ static inline int of_property_read_string_index(const struct device_node *np,
return rc < 0 ? rc : 0;
}
/**
* of_property_read_bool - Find 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 boolean property in a device node. Usage on non-boolean
* property types is deprecated.
*
* Return: true if the property exists false otherwise.
*/
static inline bool of_property_read_bool(const struct device_node *np,
const char *propname)
{
const struct property *prop = of_find_property(np, propname, NULL);
return prop ? true : false;
}
/**
* of_property_present - Test if a property is present in a node
* @np: device node to search for the property.