From: Dong Aisheng <[email protected]> The api is used when user wants to get some more extended args except ones indicated by the cells_name. For example, gpio cells is 2. list = <&gpio 1 2 3 4>; If users want to get extended args including 3, 4, he can call: of_parse_phandle_with_args_ext(np, "gpios", "#gpio-cells", index, 2, &outargs);
Signed-off-by: Dong Aisheng <[email protected]> --- drivers/of/base.c | 25 ++++++++++++++++++++++++- include/linux/of.h | 5 ++++- 2 files changed, 28 insertions(+), 2 deletions(-) diff --git a/drivers/of/base.c b/drivers/of/base.c index 91c1fb4..e51ee5f 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -893,6 +893,28 @@ int of_parse_phandle_with_args(struct device_node *np, const char *list_name, const char *cells_name, int index, struct of_phandle_args *out_args) { + return of_parse_phandle_with_args_ext(np, list_name, cells_name, + index, 0, out_args); +} +EXPORT_SYMBOL(of_parse_phandle_with_args); + +/* + * of_parse_phandle_with_args_ext() - Find a node pointed by phandle in a list + * with extended args. + * @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 + * @index: index of a phandle to parse out + * @cells_ext: property name that specifies the extended args count except + * phandles' arguments count + * @out_args: optional pointer to output arguments structure (will be filled) + */ +int of_parse_phandle_with_args_ext(struct device_node *np, + const char *list_name, + const char *cells_name, int index, + unsigned int cells_ext, + struct of_phandle_args *out_args) +{ const __be32 *list, *list_end; int size, cur_index = 0; uint32_t count = 0; @@ -936,6 +958,7 @@ int of_parse_phandle_with_args(struct device_node *np, const char *list_name, * Make sure that the arguments actually fit in the * remaining property data length */ + count += cells_ext; if (list + count > list_end) { pr_err("%s: arguments longer than property\n", np->full_name); @@ -978,7 +1001,7 @@ int of_parse_phandle_with_args(struct device_node *np, const char *list_name, of_node_put(node); return -EINVAL; } -EXPORT_SYMBOL(of_parse_phandle_with_args); +EXPORT_SYMBOL(of_parse_phandle_with_args_ext); /** * prom_add_property - Add a property to a node diff --git a/include/linux/of.h b/include/linux/of.h index 2ec1083..27b4d67 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -251,7 +251,10 @@ extern struct device_node *of_parse_phandle(struct device_node *np, extern int of_parse_phandle_with_args(struct device_node *np, const char *list_name, const char *cells_name, int index, struct of_phandle_args *out_args); - +extern int of_parse_phandle_with_args_ext(struct device_node *np, + const char *list_name, const char *cells_name, int index, + unsigned int cells_ext, + struct of_phandle_args *out_args); 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); -- 1.7.0.4 _______________________________________________ devicetree-discuss mailing list [email protected] https://lists.ozlabs.org/listinfo/devicetree-discuss
