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of: Move phandle walking to of_phandle_iterator_next()

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Move the code to walk over the phandles out of the loop in
__of_parse_phandle_with_args() to a separate function that
just works with the iterator handle: of_phandle_iterator_next().

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Joerg Roedel 2016-04-04 17:49:18 +02:00 committed by Rob Herring
parent 74e1fbb137
commit cd209b412c
2 changed files with 81 additions and 56 deletions
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130
drivers/of/base.c
View file

@ -1465,6 +1465,75 @@ int of_phandle_iterator_init(struct of_phandle_iterator *it,
return 0;
}
int of_phandle_iterator_next(struct of_phandle_iterator *it)
{
uint32_t count = 0;
if (it->node) {
of_node_put(it->node);
it->node = NULL;
}
if (!it->cur || it->phandle_end >= it->list_end)
return -ENOENT;
it->cur = it->phandle_end;
/* If phandle is 0, then it is an empty entry with no arguments. */
it->phandle = be32_to_cpup(it->cur++);
if (it->phandle) {
/*
* Find the provider node and parse the #*-cells property to
* determine the argument length.
*/
it->node = of_find_node_by_phandle(it->phandle);
if (it->cells_name) {
if (!it->node) {
pr_err("%s: could not find phandle\n",
it->parent->full_name);
goto err;
}
if (of_property_read_u32(it->node, it->cells_name,
&count)) {
pr_err("%s: could not get %s for %s\n",
it->parent->full_name,
it->cells_name,
it->node->full_name);
goto err;
}
} else {
count = it->cell_count;
}
/*
* Make sure that the arguments actually fit in the remaining
* property data length
*/
if (it->cur + count > it->list_end) {
pr_err("%s: arguments longer than property\n",
it->parent->full_name);
goto err;
}
}
it->phandle_end = it->cur + count;
it->cur_count = count;
return 0;
err:
if (it->node) {
of_node_put(it->node);
it->node = NULL;
}
return -EINVAL;
}
static int __of_parse_phandle_with_args(const struct device_node *np,
const char *list_name,
const char *cells_name,
@ -1480,59 +1549,9 @@ static int __of_parse_phandle_with_args(const struct device_node *np,
return rc;
/* Loop over the phandles until all the requested entry is found */
while (it.cur < it.list_end) {
rc = -EINVAL;
it.cur_count = 0;
while ((rc = of_phandle_iterator_next(&it)) == 0) {
/*
* If phandle is 0, then it is an empty entry with no
* arguments. Skip forward to the next entry.
*/
it.phandle = be32_to_cpup(it.cur++);
if (it.phandle) {
/*
* Find the provider node and parse the #*-cells
* 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.
*/
if (it.cells_name || cur_index == index) {
it.node = of_find_node_by_phandle(it.phandle);
if (!it.node) {
pr_err("%s: could not find phandle\n",
it.parent->full_name);
goto err;
}
}
if (it.cells_name) {
if (of_property_read_u32(it.node, it.cells_name,
&it.cur_count)) {
pr_err("%s: could not get %s for %s\n",
it.parent->full_name, it.cells_name,
it.node->full_name);
goto err;
}
} else {
it.cur_count = it.cell_count;
}
/*
* Make sure that the arguments actually fit in the
* remaining property data length
*/
if (it.cur + it.cur_count > it.list_end) {
pr_err("%s: arguments longer than property\n",
it.parent->full_name);
goto err;
}
}
/*
* All of the error cases above bail out of the loop, so at
* All of the error cases bail out of the loop, so at
* this point, the parsing is successful. If the requested
* index matches, then fill the out_args structure and return,
* or return -ENOENT for an empty entry.
@ -1558,9 +1577,6 @@ static int __of_parse_phandle_with_args(const struct device_node *np,
return 0;
}
of_node_put(it.node);
it.node = NULL;
it.cur += it.cur_count;
cur_index++;
}
@ -1570,7 +1586,9 @@ static int __of_parse_phandle_with_args(const struct device_node *np,
* -EINVAL : parsing error on data
* [1..n] : Number of phandle (count mode; when index = -1)
*/
rc = index < 0 ? cur_index : -ENOENT;
if (rc == -ENOENT && index < 0)
rc = cur_index;
err:
if (it.node)
of_node_put(it.node);

7
include/linux/of.h
View file

@ -358,6 +358,8 @@ extern int of_phandle_iterator_init(struct of_phandle_iterator *it,
const char *cells_name,
int cell_count);
extern int of_phandle_iterator_next(struct of_phandle_iterator *it);
extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
extern int of_alias_get_id(struct device_node *np, const char *stem);
extern int of_alias_get_highest_id(const char *stem);
@ -641,6 +643,11 @@ static inline int of_phandle_iterator_init(struct of_phandle_iterator *it,
return -ENOSYS;
}
static inline int of_phandle_iterator_next(struct of_phandle_iterator *it)
{
return -ENOSYS;
}
static inline int of_alias_get_id(struct device_node *np, const char *stem)
{
return -ENOSYS;