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>

diff --git a/include/sbi_utils/fdt/fdt_helper.h b/include/sbi_utils/fdt/fdt_helper.h
index 2279f96..a9c0a8a 100644 (file)
--- a/include/sbi_utils/fdt/fdt_helper.h
+++ b/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);

diff --git a/lib/utils/fdt/fdt_helper.c b/lib/utils/fdt/fdt_helper.c
index 9a35969..3b45ae8 100644 (file)
--- a/lib/utils/fdt/fdt_helper.c
+++ b/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;