Add an equivalent of of_count_phandle_with_args() for fixed argument sets, to pair with of_parse_phandle_with_fixed_args().
The existing of_count_phandle_with_args() is modified to be a private function that handles both cases and the public functions are trivial wrappers round that. Signed-off-by: Richard Fitzgerald <[email protected]> Reviewed-by: Rob Herring <[email protected]> --- drivers/of/base.c | 73 +++++++++++++++++++++++++++++++--------------- include/linux/of.h | 9 ++++++ 2 files changed, 59 insertions(+), 23 deletions(-) diff --git a/drivers/of/base.c b/drivers/of/base.c index 161a23631472..c5ff2524bf40 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -1720,34 +1720,22 @@ int of_parse_phandle_with_fixed_args(const struct device_node *np, } EXPORT_SYMBOL(of_parse_phandle_with_fixed_args); -/** - * of_count_phandle_with_args() - Find the number of phandles references in a property - * @np: pointer to a device tree node containing a list - * @list_name: property name that contains a list - * @cells_name: property name that specifies phandles' arguments count - * - * Returns the number of phandle + argument tuples within a property. It - * is a typical pattern to encode a list of phandle and variable - * arguments into a single property. The number of arguments is encoded - * by a property in the phandle-target node. For example, a gpios - * property would contain a list of GPIO specifies consisting of a - * phandle and 1 or more arguments. The number of arguments are - * determined by the #gpio-cells property in the node pointed to by the - * phandle. - */ -int of_count_phandle_with_args(const struct device_node *np, const char *list_name, - const char *cells_name) +static int __of_count_phandle_with_args(const struct device_node *np, + const char *list_name, + const char *cells_name, + int cells_count) { struct of_phandle_iterator it; int rc, cur_index = 0; /* - * If cells_name is NULL we assume a cell count of 0. This makes - * counting the phandles trivial as each 32bit word in the list is a - * phandle and no arguments are to consider. So we don't iterate through - * the list but just use the length to determine the phandle count. + * If cells_count < 0 and cells_name is NULL we assume a cell count + * of 0. A zero cell count makes counting the phandles trivial as each + * 32bit word in the list is a phandle and no arguments are to consider. + * So we don't iterate through the list but just use the length to + * determine the phandle count. */ - if (!cells_name) { + if ((cells_count < 0 && !cells_name) || cells_count == 0) { const __be32 *list; int size; @@ -1758,7 +1746,7 @@ int of_count_phandle_with_args(const struct device_node *np, const char *list_na return size / sizeof(*list); } - rc = of_phandle_iterator_init(&it, np, list_name, cells_name, -1); + rc = of_phandle_iterator_init(&it, np, list_name, cells_name, cells_count); if (rc) return rc; @@ -1770,8 +1758,47 @@ int of_count_phandle_with_args(const struct device_node *np, const char *list_na return cur_index; } + +/** + * of_count_phandle_with_args() - Find the number of phandles references in a property + * @np: pointer to a device tree node containing a list + * @list_name: property name that contains a list + * @cells_name: property name that specifies phandles' arguments count + * + * Returns the number of phandle + argument tuples within a property. It + * is a typical pattern to encode a list of phandle and variable + * arguments into a single property. The number of arguments is encoded + * by a property in the phandle-target node. For example, a gpios + * property would contain a list of GPIO specifies consisting of a + * phandle and 1 or more arguments. The number of arguments are + * determined by the #gpio-cells property in the node pointed to by the + * phandle. + */ +int of_count_phandle_with_args(const struct device_node *np, const char *list_name, + const char *cells_name) +{ + return __of_count_phandle_with_args(np, list_name, cells_name, -1); +} EXPORT_SYMBOL(of_count_phandle_with_args); +/** + * of_count_phandle_with_fixed_args() - Find the number of phandles references in a property + * @np: pointer to a device tree node containing a list + * @list_name: property name that contains a list + * @cell_count: number of argument cells following the phandle + * + * Returns the number of phandle + argument tuples within a property. It + * is a typical pattern to encode a list of phandle and variable + * arguments into a single property. + */ +int of_count_phandle_with_fixed_args(const struct device_node *np, + const char *list_name, + int cells_count) +{ + return __of_count_phandle_with_args(np, list_name, NULL, cells_count); +} +EXPORT_SYMBOL(of_count_phandle_with_fixed_args); + /** * __of_add_property - Add a property to a node without lock operations */ diff --git a/include/linux/of.h b/include/linux/of.h index 5d51891cbf1a..2f28da56ec9b 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -377,6 +377,8 @@ extern int of_parse_phandle_with_fixed_args(const struct device_node *np, struct of_phandle_args *out_args); extern int of_count_phandle_with_args(const struct device_node *np, const char *list_name, const char *cells_name); +extern int of_count_phandle_with_fixed_args(const struct device_node *np, + const char *list_name, int cells_count); /* phandle iterator functions */ extern int of_phandle_iterator_init(struct of_phandle_iterator *it, @@ -886,6 +888,13 @@ static inline int of_count_phandle_with_args(struct device_node *np, return -ENOSYS; } +static inline int of_count_phandle_with_fixed_args(const struct device_node *np, + const char *list_name, + int cells_count) +{ + return -ENOSYS; +} + static inline int of_phandle_iterator_init(struct of_phandle_iterator *it, const struct device_node *np, const char *list_name, -- 2.20.1
