Re: [PATCH] of: use hash based search in of_find_node_by_phandle

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On 1/26/2018 1:24 AM, Frank Rowand wrote:
On 01/25/18 02:14, Chintan Pandya wrote:
of_find_node_by_phandle() takes a lot of time finding
right node when your intended device is too right-side
in the fdt. Reason is, we search each device serially
from the fdt, starting from left-most to right-most.
Please give me a pointer to the code that is doing
this search.

-Frank
You can refer include/linux/of.h

#define for_each_of_allnodes_from(from, dn) \
        for (dn = __of_find_all_nodes(from); dn; dn = __of_find_all_nodes(dn))
#define for_each_of_allnodes(dn) for_each_of_allnodes_from(NULL, dn)

where __of_find_all_nodes() does

struct device_node *__of_find_all_nodes(struct device_node *prev)
{
        struct device_node *np;
        if (!prev) {
                np = of_root;
        } else if (prev->child) {
                np = prev->child;
        } else {
                /* Walk back up looking for a sibling, or the end of the structure */
                np = prev;
                while (np->parent && !np->sibling)
                        np = np->parent;
                np = np->sibling; /* Might be null at the end of the tree */
        }
        return np;
}

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