/* Return the next sibling of this node or 0. */
static phandle_t
ofw_fdt_peer(ofw_t ofw, phandle_t node)
{
int depth, offset;
if (node == 0) {
/* Find root node */
offset = fdt_path_offset(fdtp, "/");
return (fdt_offset_phandle(offset));
}
offset = fdt_phandle_offset(node);
if (offset < 0)
return (0);
for (depth = 1, offset = fdt_next_node(fdtp, offset, &depth);
offset >= 0;
offset = fdt_next_node(fdtp, offset, &depth)) {
if (depth < 0)
return (0);
if (depth == 1)
return (fdt_offset_phandle(offset));
}
return (0);
}
/* Return a package handle for the specified device. */
static phandle_t
ofw_fdt_finddevice(ofw_t ofw, const char *device)
{
int offset;
offset = fdt_path_offset(fdtp, device);
return (fdt_offset_phandle(offset));
}
/* Return the parent of this node or 0. */
static phandle_t
ofw_fdt_parent(ofw_t ofw, phandle_t node)
{
int offset, paroffset;
offset = fdt_phandle_offset(node);
if (offset < 0)
return (0);
paroffset = fdt_parent_offset(fdtp, offset);
return (fdt_offset_phandle(paroffset));
}
/* Return the package handle that corresponds to an instance handle. */
static phandle_t
ofw_fdt_instance_to_package(ofw_t ofw, ihandle_t instance)
{
int offset;
/*
* Note: FDT does not have the notion of instances, but we somewhat
* abuse the semantics and let treat as 'instance' the internal
* 'phandle' prop, so that ofw I/F consumers have a uniform way of
* translation between internal representation (which appear in some
* contexts as property values) and effective phandles.
*/
offset = fdt_node_offset_by_phandle(fdtp, instance);
if (offset < 0)
return (-1);
return (fdt_offset_phandle(offset));
}
/* Return the first child of this node or 0. */
static phandle_t
ofw_fdt_child(ofw_t ofw, phandle_t node)
{
int depth, offset;
offset = fdt_phandle_offset(node);
if (offset < 0)
return (0);
for (depth = 0, offset = fdt_next_node(fdtp, offset, &depth);
(offset >= 0) && (depth > 0);
offset = fdt_next_node(fdtp, offset, &depth)) {
if (depth < 0)
return (0);
if (depth == 1)
return (fdt_offset_phandle(offset));
}
return (0);
}
