ofnode: add ofnode_by_prop_value()

Adds ofnode_by_prop_value() to search for nodes with a given property
and value, an ofnode version of fdt_node_offset_by_prop_value().

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Jens Wiklander 2018-08-20 11:09:58 +02:00 committed by Simon Glass
parent 427ddd8420
commit 61fba0faba
4 changed files with 71 additions and 0 deletions

View File

@ -376,6 +376,33 @@ struct device_node *of_find_compatible_node(struct device_node *from,
return np;
}
static int of_device_has_prop_value(const struct device_node *device,
const char *propname, const void *propval,
int proplen)
{
struct property *prop = of_find_property(device, propname, NULL);
if (!prop || !prop->value || prop->length != proplen)
return 0;
return !memcmp(prop->value, propval, proplen);
}
struct device_node *of_find_node_by_prop_value(struct device_node *from,
const char *propname,
const void *propval, int proplen)
{
struct device_node *np;
for_each_of_allnodes_from(from, np) {
if (of_device_has_prop_value(np, propname, propval, proplen) &&
of_node_get(np))
break;
}
of_node_put(from);
return np;
}
struct device_node *of_find_node_by_phandle(phandle handle)
{
struct device_node *np;

View File

@ -777,3 +777,17 @@ ofnode ofnode_by_compatible(ofnode from, const char *compat)
gd->fdt_blob, ofnode_to_offset(from), compat));
}
}
ofnode ofnode_by_prop_value(ofnode from, const char *propname,
const void *propval, int proplen)
{
if (of_live_active()) {
return np_to_ofnode(of_find_node_by_prop_value(
(struct device_node *)ofnode_to_np(from), propname,
propval, proplen));
} else {
return offset_to_ofnode(fdt_node_offset_by_prop_value(
gd->fdt_blob, ofnode_to_offset(from),
propname, propval, proplen));
}
}

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@ -193,6 +193,22 @@ static inline struct device_node *of_find_node_by_path(const char *path)
struct device_node *of_find_compatible_node(struct device_node *from,
const char *type, const char *compatible);
/**
* of_find_node_by_prop_value() - find a node with a given property value
*
* Find a node based on a property value.
* @from: Node to start searching from or NULL. the node you pass will not be
* searched, only the next one will; typically, you pass what the previous
* call returned.
* @propname: property name to check
* @propval: property value to search for
* @proplen: length of the value in propval
* @return node pointer or NULL if not found
*/
struct device_node *of_find_node_by_prop_value(struct device_node *from,
const char *propname,
const void *propval,
int proplen);
/**
* of_find_node_by_phandle() - Find a node given a phandle
*

View File

@ -702,6 +702,20 @@ int ofnode_read_resource_byname(ofnode node, const char *name,
*/
ofnode ofnode_by_compatible(ofnode from, const char *compat);
/**
* ofnode_by_prop_value() - Find the next node with given property value
*
* Find the next node after @from that has a @propname with a value
* @propval and a length @proplen.
*
* @from: ofnode to start from (use ofnode_null() to start at the
* beginning) @propname: property name to check @propval: property value to
* search for @proplen: length of the value in propval @return ofnode
* found, or ofnode_null() if none
*/
ofnode ofnode_by_prop_value(ofnode from, const char *propname,
const void *propval, int proplen);
/**
* ofnode_for_each_subnode() - iterate over all subnodes of a parent
*