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of: provide of_machine_read_compatible()

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Provide a helper function allowing users to read the compatible string
of the machine, hiding the access to the root node.

Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260223-soc-of-root-v2-1-b45da45903c8@oss.qualcomm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bartosz Golaszewski 2026-02-23 14:37:16 +01:00 committed by Greg Kroah-Hartman
parent 2de27980e1
commit 59621105ff
2 changed files with 23 additions and 0 deletions
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15
drivers/of/base.c
View File

@ -434,6 +434,21 @@ bool of_machine_compatible_match(const char *const *compats)
}
EXPORT_SYMBOL(of_machine_compatible_match);
/**
* of_machine_read_compatible - Get the compatible string of this machine
* @compatible: address at which the address of the compatible string will be
* stored
* @index: index of the compatible entry in the list
*
* Returns:
* 0 on success, negative error number on failure.
*/
int of_machine_read_compatible(const char **compatible, unsigned int index)
{
return of_property_read_string_index(of_root, "compatible", index, compatible);
}
EXPORT_SYMBOL_GPL(of_machine_read_compatible);
/**
* of_machine_device_match - Test root of device tree against a of_device_id array
* @matches: NULL terminated array of of_device_id match structures to search in

8
include/linux/of.h
View File

@ -426,6 +426,8 @@ static inline bool of_machine_is_compatible(const char *compat)
return of_machine_compatible_match(compats);
}
int of_machine_read_compatible(const char **compatible, unsigned int index);
extern int of_add_property(struct device_node *np, struct property *prop);
extern int of_remove_property(struct device_node *np, struct property *prop);
extern int of_update_property(struct device_node *np, struct property *newprop);
@ -851,6 +853,12 @@ static inline int of_machine_is_compatible(const char *compat)
return 0;
}
static inline int of_machine_read_compatible(const char **compatible,
unsigned int index)
{
return -ENOSYS;
}
static inline int of_add_property(struct device_node *np, struct property *prop)
{
return 0;