dev: add platform bus and devicetree support

Change-Id: Ief8e159b25d4fc4859c7116da6ff22c15bd3fff0
Type: feature
Signed-off-by: Damjan Marion <damarion@cisco.com>

1 files changed, 72 insertions, 0 deletions

diff --git a/src/vppinfra/devicetree.h b/src/vppinfra/devicetree.h
new file mode 100644
index 00000000000..21c2e0f7006
--- /dev/null
+++ b/src/vppinfra/devicetree.h
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: Apache-2.0
+ * Copyright (c) 2024 Cisco Systems, Inc.
+ */
+
+#ifndef CLIB_DEVICETREE_H_
+#define CLIB_DEVICETREE_H_
+
+#include <vppinfra/clib.h>
+#include <vlib/vlib.h>
+
+#ifdef __linux
+#define CLIB_DT_LINUX_PREFIX "/sys/firmware/devicetree/base"
+#endif
+
+typedef struct
+{
+  char name[32];
+  u32 size;
+  u8 data[];
+} clib_dt_property_t;
+
+typedef struct clib_dt_main clib_dt_main_t;
+
+typedef struct clib_dt_node
+{
+  u8 *path;
+  struct clib_dt_node *parent;
+  struct clib_dt_node *prev;
+  struct clib_dt_node *next;
+  struct clib_dt_node **child_nodes;
+  u8 depth;
+  clib_dt_property_t *name;
+  clib_dt_property_t **properties;
+  clib_dt_main_t *dt_main;
+} clib_dt_node_t;
+
+typedef struct clib_dt_main
+{
+  clib_dt_node_t **nodes;
+  clib_dt_node_t *root;
+  uword *node_by_path;
+  uword *node_by_phandle;
+} clib_dt_main_t;
+
+clib_dt_node_t *clib_dt_get_node_with_path (clib_dt_main_t *dm, char *fmt,
+					    ...);
+clib_dt_property_t *clib_dt_get_node_property_by_name (clib_dt_node_t *,
+						       char *);
+int clib_dt_node_is_compatible (clib_dt_node_t *, char *);
+clib_dt_node_t *clib_dt_dereference_node (clib_dt_node_t *, char *);
+#ifdef __linux
+clib_error_t *clib_dt_read_from_sysfs (clib_dt_main_t *dm);
+#endif
+
+format_function_t format_clib_dt_desc;
+format_function_t format_clib_dt_property_data;
+
+static_always_inline int
+clib_dt_proprerty_is_u32 (clib_dt_property_t *p)
+{
+  if (p == 0 || p->size != 4)
+    return 0;
+  return 1;
+}
+
+static_always_inline u32
+clib_dt_proprerty_get_u32 (clib_dt_property_t *p)
+{
+  return clib_net_to_host_u32 (*(u32u *) p->data);
+}
+
+#endif /* CLIB_DEVICETREE_H_ */