lib: utils/fdt: Add fdt_parse_phandle_with_args() API

The libfdt project does not have a generic API to parse phandle
with args from a DT node so we add fdt_parse_phandle_with_args()
for this purpose. This new API will be useful to FDT based drivers.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/include/sbi_utils/fdt/fdt_helper.h b/include/sbi_utils/fdt/fdt_helper.h
index 871f9b9..55b9382 100644
--- a/include/sbi_utils/fdt/fdt_helper.h
+++ b/include/sbi_utils/fdt/fdt_helper.h
@@ -17,6 +17,13 @@ struct fdt_match {
 	void *data;
 };
 
+#define FDT_MAX_PHANDLE_ARGS 16
+struct fdt_phandle_args {
+	int node_offset;
+	int args_count;
+	u32 args[FDT_MAX_PHANDLE_ARGS];
+};
+
 struct platform_uart_data {
 	unsigned long addr;
 	unsigned long freq;
@@ -32,6 +39,10 @@ int fdt_find_match(void *fdt, int startoff,
 		   const struct fdt_match *match_table,
 		   const struct fdt_match **out_match);
 
+int fdt_parse_phandle_with_args(void *fdt, int nodeoff,
+				const char *prop, const char *cells_prop,
+				int index, struct fdt_phandle_args *out_args);
+
 int fdt_get_node_addr_size(void *fdt, int node, unsigned long *addr,
 			   unsigned long *size);