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authorPatrice Chotard <patrice.chotard@st.com>2017-07-18 11:57:08 +0200
committerMarek Vasut <marex@denx.de>2017-07-28 23:34:08 +0200
commit642346ae269c3c5c54cf7e15c426c42f4df031da (patch)
tree2ca4b749f8fe2965314dcde27c388c7eb4ce5ff2 /include/dm/of_access.h
parent82a8a669b4f7159f1f3c3251c2fcb36965896290 (diff)
dm: core: add ofnode_count_phandle_with_args()
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. Add also the dev_count_phandle_with_args() based on ofnode_count_phandle_with_args() Signed-off-by: Patrice Chotard <patrice.chotard@st.com> Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include/dm/of_access.h')
-rw-r--r--include/dm/of_access.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/dm/of_access.h b/include/dm/of_access.h
index c5ea391aec..c49d287dd6 100644
--- a/include/dm/of_access.h
+++ b/include/dm/of_access.h
@@ -353,6 +353,24 @@ 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