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of: call __of_parse_phandle_with_args from of_parse_phandle

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The simplest case of __of_parse_phandle_with_args() now implements the
semantics of of_parse_phandle(). Rewrite of_parse_phandle() to call
__of_parse_phandle_with_args() rather than open-coding the simple case.

Optimize __of_parse_phandle_with_args() so that it doesn't call
of_find_node_by_phandle() except when it's strictly needed. This avoids
introducing too much overhead when replacing of_parse_phandle().

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
This commit is contained in:
Stephen Warren 2013-08-14 15:27:11 -06:00 committed by Grant Likely
parent 035fd94822
commit 91d9942c28
1 changed files with 20 additions and 11 deletions
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31
drivers/of/base.c
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@ -1111,13 +1111,20 @@ static int __of_parse_phandle_with_args(const struct device_node *np,
if (phandle) {
/*
* Find the provider node and parse the #*-cells
* property to determine the argument length
* property to determine the argument length.
*
* This is not needed if the cell count is hard-coded
* (i.e. cells_name not set, but cell_count is set),
* except when we're going to return the found node
* below.
*/
node = of_find_node_by_phandle(phandle);
if (!node) {
pr_err("%s: could not find phandle\n",
np->full_name);
goto err;
if (cells_name || cur_index == index) {
node = of_find_node_by_phandle(phandle);
if (!node) {
pr_err("%s: could not find phandle\n",
np->full_name);
goto err;
}
}
if (cells_name) {
@ -1202,14 +1209,16 @@ static int __of_parse_phandle_with_args(const struct device_node *np,
struct device_node *of_parse_phandle(const struct device_node *np,
const char *phandle_name, int index)
{
const __be32 *phandle;
int size;
struct of_phandle_args args;
phandle = of_get_property(np, phandle_name, &size);
if ((!phandle) || (size < sizeof(*phandle) * (index + 1)))
if (index < 0)
return NULL;
return of_find_node_by_phandle(be32_to_cpup(phandle + index));
if (__of_parse_phandle_with_args(np, phandle_name, NULL, 0,
index, &args))
return NULL;
return args.np;
}
EXPORT_SYMBOL(of_parse_phandle);