lib: utils/fdt: introduce fdt_node_is_enabled()

If an FDT node contains a "status" property and this property is not
"ok" or "okay", this node should be ignored. Introduce a function that
checks this.

Signed-off-by: Jan Remes <jan.remes@codasip.com>
Reviewed-by: Xiang W <wxjstz@126.com>
Reviewed-by: Anup Patel <anup@brainfault.org>

include/sbi_utils/fdt/fdt_helper.h

@@ -48,6 +48,8 @@ int fdt_parse_phandle_with_args(void *fdt, int nodeoff,
 int fdt_get_node_addr_size(void *fdt, int node, int index,
 			   uint64_t *addr, uint64_t *size);
 
+bool fdt_node_is_enabled(void *fdt, int nodeoff);
+
 int fdt_parse_hart_id(void *fdt, int cpu_offset, u32 *hartid);
 
 int fdt_parse_max_hart_id(void *fdt, u32 *max_hartid);

lib/utils/fdt/fdt_helper.c

@@ -216,6 +216,24 @@ int fdt_get_node_addr_size(void *fdt, int node, int index,
 	return 0;
 }
 
+bool fdt_node_is_enabled(void *fdt, int nodeoff)
+{
+	int len;
+	const void *prop;
+
+	prop = fdt_getprop(fdt, nodeoff, "status", &len);
+	if (!prop)
+		return true;
+
+	if (!strncmp(prop, "okay", strlen("okay")))
+		return true;
+
+	if (!strncmp(prop, "ok", strlen("ok")))
+		return true;
+
+	return false;
+}
+
 int fdt_parse_hart_id(void *fdt, int cpu_offset, u32 *hartid)
 {
 	int len;