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of: dynamic: Add of_changeset_update_prop_string

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Add a helper function to add string property updates to an OF changeset.
This is similar to of_changeset_add_prop_string(), but instead of adding
the property (and failing if it exists), it will update the property.

This shall be used later in the DT hardware prober.

Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
This commit is contained in:
Chen-Yu Tsai 2024-11-06 17:33:28 +08:00 committed by Wolfram Sang
parent aaf20f870d
commit 81de291d86
2 changed files with 48 additions and 0 deletions
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44
drivers/of/dynamic.c
View File

@ -1072,3 +1072,47 @@ int of_changeset_add_prop_bool(struct of_changeset *ocs, struct device_node *np,
return of_changeset_add_prop_helper(ocs, np, &prop);
}
EXPORT_SYMBOL_GPL(of_changeset_add_prop_bool);
static int of_changeset_update_prop_helper(struct of_changeset *ocs,
struct device_node *np,
const struct property *pp)
{
struct property *new_pp;
int ret;
new_pp = __of_prop_dup(pp, GFP_KERNEL);
if (!new_pp)
return -ENOMEM;
ret = of_changeset_update_property(ocs, np, new_pp);
if (ret)
__of_prop_free(new_pp);
return ret;
}
/**
* of_changeset_update_prop_string - Add a string property update to a changeset
*
* @ocs: changeset pointer
* @np: device node pointer
* @prop_name: name of the property to be updated
* @str: pointer to null terminated string
*
* Create a string property to be updated and add it to a changeset.
*
* Return: 0 on success, a negative error value in case of an error.
*/
int of_changeset_update_prop_string(struct of_changeset *ocs,
struct device_node *np,
const char *prop_name, const char *str)
{
struct property prop = {
.name = (char *)prop_name,
.length = strlen(str) + 1,
.value = (void *)str,
};
return of_changeset_update_prop_helper(ocs, np, &prop);
}
EXPORT_SYMBOL_GPL(of_changeset_update_prop_string);

4
include/linux/of.h
View File

@ -1651,6 +1651,10 @@ static inline int of_changeset_add_prop_u32(struct of_changeset *ocs,
return of_changeset_add_prop_u32_array(ocs, np, prop_name, &val, 1);
}
int of_changeset_update_prop_string(struct of_changeset *ocs,
struct device_node *np,
const char *prop_name, const char *str);
int of_changeset_add_prop_bool(struct of_changeset *ocs, struct device_node *np,
const char *prop_name);