From: Stephen Warren <swar...@nvidia.com>
This is identical to of_parse_phandle_with_args(), except that the
number of argument cells is fixed, rather than being parsed out of the
node referenced by each phandle.
Signed-off-by: Stephen Warren <swar...@nvidia.com>
---
drivers/of/base.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++--------
include/linux/of.h | 10 ++++++++
2 files changed, 68 insertions(+), 9 deletions(-)
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 23e7073..ad799d9 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1106,7 +1106,8 @@ EXPORT_SYMBOL(of_parse_phandle);
static int __of_parse_phandle_with_args(const struct device_node *np,
const char *list_name,
- const char *cells_name, int index,
+ const char *cells_name,
+ int cells_count, int index,
struct of_phandle_args *out_args)
{
const __be32 *list, *list_end;
@@ -1142,12 +1143,17 @@ static int __of_parse_phandle_with_args(const struct
device_node *np,
np->full_name);
goto err;
}
- if (of_property_read_u32(node, cells_name, &count)) {
- pr_err("%s: could not get %s for %s\n",
- np->full_name, cells_name,
- node->full_name);
- goto err;
- }
+
+ if (cells_name) {
+ if (of_property_read_u32(node, cells_name,
+ &count)) {
+ pr_err("%s: could not get %s for %s\n",
+ np->full_name, cells_name,
+ node->full_name);
+ goto err;
+ }
+ } else
+ count = cells_count;
/*
* Make sure that the arguments actually fit in the
@@ -1244,11 +1250,53 @@ int of_parse_phandle_with_args(const struct device_node
*np, const char *list_na
{
if (index < 0)
return -EINVAL;
- return __of_parse_phandle_with_args(np, list_name, cells_name, index,
out_args);
+ return __of_parse_phandle_with_args(np, list_name, cells_name, 0,
+ index, out_args);
}
EXPORT_SYMBOL(of_parse_phandle_with_args);
/**
+ * of_parse_phandle_with_fixed_args() - Find a node pointed by phandle in a
list
+ * @np: pointer to a device tree node containing a list
+ * @list_name: property name that contains a list
+ * @cells_count: number of argument cells following the phandle
+ * @index: index of a phandle to parse out
+ * @out_args: optional pointer to output arguments structure (will be filled)
+ *
+ * This function is useful to parse lists of phandles and their arguments.
+ * Returns 0 on success and fills out_args, on error returns appropriate
+ * errno value.
+ *
+ * Caller is responsible to call of_node_put() on the returned out_args->node
+ * pointer.
+ *
+ * Example:
+ *
+ * phandle1: node1 {
+ * }
+ *
+ * phandle2: node2 {
+ * }
+ *
+ * node3 {
+ * list = <&phandle1 0 2 &phandle2 2 3>;
+ * }
+ *
+ * To get a device_node of the `node2' node you may call this:
+ * of_parse_phandle_with_fixed_args(node3, "list", 2, 1, &args);
+ */
+int of_parse_phandle_with_fixed_args(const struct device_node *np,
+ const char *list_name, int cells_count,
+ int index, struct of_phandle_args *out_args)
+{
+ if (index < 0)
+ return -EINVAL;
+ return __of_parse_phandle_with_args(np, list_name, NULL, cells_count,
+ index, out_args);
+}
+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
@@ -1266,7 +1314,8 @@ EXPORT_SYMBOL(of_parse_phandle_with_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, -1,
NULL);
+ return __of_parse_phandle_with_args(np, list_name, cells_name, 0, -1,
+ NULL);
}
EXPORT_SYMBOL(of_count_phandle_with_args);
diff --git a/include/linux/of.h b/include/linux/of.h
index 1fd08ca..0c457f5 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -280,6 +280,9 @@ extern struct device_node *of_parse_phandle(const struct
device_node *np,
extern int of_parse_phandle_with_args(const 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_fixed_args(const struct device_node *np,
+ const char *list_name, int cells_count, int index,
+ 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);
@@ -488,6 +491,13 @@ static inline int of_parse_phandle_with_args(struct
device_node *np,
return -ENOSYS;
}
+static inline int of_parse_phandle_with_fixed_args(const struct device_node
*np,
+ const char *list_name, int cells_count, int index,
+ struct of_phandle_args *out_args)
+{
+ return -ENOSYS;
+}
+
static inline int of_count_phandle_with_args(struct device_node *np,
const char *list_name,
const char *cells_name)
--
1.8.1.5
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