Hi Simon,
A nit
On Mon, 5 Jan 2015 20:05:26 -0700 Simon Glass sjg@chromium.org wrote:
For GPIOs and other functions we want to look up a phandle and then decode a list of arguments for that phandle. Each phandle can have a different number of arguments, specified by a property in the target node. This is the "#gpio-cells" property for GPIOs.
Add a function to provide this feature, taken modified from Linux 3.18.
Signed-off-by: Simon Glass sjg@chromium.org
include/fdtdec.h | 53 ++++++++++++++++++++++++ lib/fdtdec.c | 124 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 177 insertions(+)
diff --git a/include/fdtdec.h b/include/fdtdec.h index 5effa24..629e072 100644 --- a/include/fdtdec.h +++ b/include/fdtdec.h @@ -133,6 +133,59 @@ enum fdt_compat_id { COMPAT_COUNT, };
+#define MAX_PHANDLE_ARGS 16 +struct fdtdec_phandle_args {
- int node;
- int args_count;
- uint32_t args[MAX_PHANDLE_ARGS];
+};
+/**
- fdtdec_parse_phandle_with_args() - Find a node pointed by phandle in a list
- This function is useful to parse lists of phandles and their arguments.
- Example:
- phandle1: node1 {
- #list-cells = <2>;
- }
- phandle2: node2 {
- #list-cells = <1>;
- }
- node3 {
- list = <&phandle1 1 2 &phandle2 3>;
- }
- To get a device_node of the `node2' node you may call this:
- fdtdec_parse_phandle_with_args(blob, node3, "list", "#list-cells", 0, 1,
&args);
- (This function is a modified version of of_parse_phandle_with_args() from
- Linux 3.18)
I think this is a modified version of __of_parse_phandle_with_args()
Best Regards Masahiro Yamada