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Subject[PATCH v4 5/6] of: add of_parse_phandle_with_args_ext function
Date
From: Dong Aisheng <dong.aisheng@linaro.org>

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 <dong.aisheng@linaro.org>
---
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



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