1 files changed, 61 insertions, 0 deletions
diff --git a/include/common/fdt_wrappers.h b/include/common/fdt_wrappers.h
new file mode 100644
index 0000000..2929fc2
--- /dev/null
+++ b/include/common/fdt_wrappers.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2018-2022, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/* Helper functions to offer easier navigation of Device Tree Blob */
+
+#ifndef FDT_WRAPPERS_H
+#define FDT_WRAPPERS_H
+
+#include <libfdt_env.h>
+
+/* Number of cells, given total length in bytes. Each cell is 4 bytes long */
+#define NCELLS(len) ((len) / 4U)
+
+int fdt_read_uint32(const void *dtb, int node, const char *prop_name,
+		    uint32_t *value);
+uint32_t fdt_read_uint32_default(const void *dtb, int node,
+				 const char *prop_name, uint32_t dflt_value);
+int fdt_read_uint64(const void *dtb, int node, const char *prop_name,
+		    uint64_t *value);
+int fdt_read_uint32_array(const void *dtb, int node, const char *prop_name,
+			  unsigned int cells, uint32_t *value);
+int fdtw_read_string(const void *dtb, int node, const char *prop,
+		char *str, size_t size);
+int fdtw_read_uuid(const void *dtb, int node, const char *prop,
+		   unsigned int length, uint8_t *uuid);
+int fdtw_write_inplace_cells(void *dtb, int node, const char *prop,
+		unsigned int cells, void *value);
+int fdtw_read_bytes(const void *dtb, int node, const char *prop,
+		unsigned int length, void *value);
+int fdtw_write_inplace_bytes(void *dtb, int node, const char *prop,
+		unsigned int length, const void *data);
+int fdt_get_reg_props_by_index(const void *dtb, int node, int index,
+			       uintptr_t *base, size_t *size);
+int fdt_get_reg_props_by_name(const void *dtb, int node, const char *name,
+			      uintptr_t *base, size_t *size);
+int fdt_get_stdout_node_offset(const void *dtb);
+
+uint64_t fdtw_translate_address(const void *dtb, int bus_node,
+				uint64_t base_address);
+
+int fdtw_for_each_cpu(const void *fdt,
+		      int (*callback)(const void *dtb, int node, uintptr_t mpidr));
+
+int fdtw_find_or_add_subnode(void *fdt, int parentoffset, const char *name);
+
+static inline uint32_t fdt_blob_size(const void *dtb)
+{
+	const uint32_t *dtb_header = dtb;
+
+	return fdt32_to_cpu(dtb_header[1]);
+}
+
+#define fdt_for_each_compatible_node(dtb, node, compatible_str)       \
+for (node = fdt_node_offset_by_compatible(dtb, -1, compatible_str);   \
+     node >= 0;                                                       \
+     node = fdt_node_offset_by_compatible(dtb, node, compatible_str))
+
+#endif /* FDT_WRAPPERS_H */