[PATCH v2 1/3] lib: utils/fdt: introduce fdt_node_is_enabled()

[Jan Remeš]

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 at codasip.com>
---
 include/sbi_utils/fdt/fdt_helper.h |  2 ++
 lib/utils/fdt/fdt_helper.c         | 18 ++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/include/sbi_utils/fdt/fdt_helper.h
b/include/sbi_utils/fdt/fdt_helper.h
index 2279f96..a9c0a8a 100644
--- 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
--- 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;
-- 
2.35.1