From: Patrice Chotard patrice.chotard@st.com
This function is usefull to get phandle number contained in a property list. For example, this allows to allocate the right amount of memory to keep clock's reference contained into the "clocks" property.
To implement it, either of_count_phandle_with_args() or fdtdec_parse_phandle_with_args() are used respectively for live tree and flat tree. By passing index = -1, these 2 functions returns the number of phandle contained into the property list.
Signed-off-by: Patrice Chotard patrice.chotard@st.com Reviewed-by: Simon Glass sjg@chromium.org --- v9: _ none v8: _ none v7: _ add ofnode_count_phandle_with_args() which returns the phandle number contained into a property list.
drivers/core/of_access.c | 7 +++++++ drivers/core/ofnode.c | 12 ++++++++++++ include/dm/of_access.h | 18 ++++++++++++++++++ include/dm/ofnode.h | 17 +++++++++++++++++ 4 files changed, 54 insertions(+)
diff --git a/drivers/core/of_access.c b/drivers/core/of_access.c index 93a6560..76d5996 100644 --- a/drivers/core/of_access.c +++ b/drivers/core/of_access.c @@ -641,6 +641,13 @@ int of_parse_phandle_with_args(const struct device_node *np, index, out_args); }
+int of_count_phandle_with_args(const struct device_node *np, + const char *list_name, const char *cells_name) +{ + return __of_parse_phandle_with_args(np, list_name, cells_name, 0, + -1, NULL); +} + static void of_alias_add(struct alias_prop *ap, struct device_node *np, int id, const char *stem, int stem_len) { diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c index ac312d6..02bc5d2 100644 --- a/drivers/core/ofnode.c +++ b/drivers/core/ofnode.c @@ -307,6 +307,18 @@ int ofnode_parse_phandle_with_args(ofnode node, const char *list_name, return 0; }
+int ofnode_count_phandle_with_args(ofnode node, const char *list_name, + const char *cells_name) +{ + if (ofnode_is_np(node)) + return of_count_phandle_with_args(ofnode_to_np(node), + list_name, cells_name); + else + return fdtdec_parse_phandle_with_args(gd->fdt_blob, + ofnode_to_offset(node), list_name, cells_name, + 0, -1, NULL); +} + ofnode ofnode_path(const char *path) { if (of_live_active()) diff --git a/include/dm/of_access.h b/include/dm/of_access.h index 142f0f4..5be29b1 100644 --- a/include/dm/of_access.h +++ b/include/dm/of_access.h @@ -315,6 +315,24 @@ int of_parse_phandle_with_args(const struct device_node *np, int index, struct of_phandle_args *out_args);
/** + * of_count_phandle_with_args() - Count the number of phandle in a list + * + * @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 + * @return number of phandle found, -ENOENT if + * @list_name does not exist, -EINVAL if a phandle was not found, + * @cells_name could not be found, the arguments were truncated or there + * were too many arguments. + * + * Returns number of phandle found on success, on error returns appropriate + * errno value. + * + */ +int of_count_phandle_with_args(const struct device_node *np, + const char *list_name, const char *cells_name); + +/** * of_alias_scan() - Scan all properties of the 'aliases' node * * The function scans all the properties of the 'aliases' node and populates diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h index 149622a..3f2cfbb 100644 --- a/include/dm/ofnode.h +++ b/include/dm/ofnode.h @@ -423,6 +423,23 @@ int ofnode_parse_phandle_with_args(ofnode node, const char *list_name, struct ofnode_phandle_args *out_args);
/** + * ofnode_count_phandle_with_args() - Count number of phandle in a list + * + * This function is useful to count phandles into a list. + * Returns number of phandle on success, on error returns appropriate + * errno value. + * + * @node: device tree node containing a list + * @list_name: property name that contains a list + * @cells_name: property name that specifies phandles' arguments count + * @return number of phandle on success, -ENOENT if @list_name does not + * exist, -EINVAL if a phandle was not found, @cells_name could not + * be found. + */ +int ofnode_count_phandle_with_args(ofnode node, const char *list_name, + const char *cells_name); + +/** * ofnode_path() - find a node by full path * * @path: Full path to node, e.g. "/bus/spi@1"