1 /* 2 * Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 /* Helper functions to offer easier navigation of Device Tree Blob */ 8 9 #ifndef FDT_WRAPPERS_H 10 #define FDT_WRAPPERS_H 11 12 /* Number of cells, given total length in bytes. Each cell is 4 bytes long */ 13 #define NCELLS(len) ((len) / 4U) 14 15 int fdt_read_uint32(const void *dtb, int node, const char *prop_name, 16 uint32_t *value); 17 uint32_t fdt_read_uint32_default(const void *dtb, int node, 18 const char *prop_name, uint32_t dflt_value); 19 int fdt_read_uint64(const void *dtb, int node, const char *prop_name, 20 uint64_t *value); 21 int fdt_read_uint32_array(const void *dtb, int node, const char *prop_name, 22 unsigned int cells, uint32_t *value); 23 int fdtw_read_string(const void *dtb, int node, const char *prop, 24 char *str, size_t size); 25 int fdtw_write_inplace_cells(void *dtb, int node, const char *prop, 26 unsigned int cells, void *value); 27 int fdtw_read_bytes(const void *dtb, int node, const char *prop, 28 unsigned int length, void *value); 29 int fdtw_write_inplace_bytes(void *dtb, int node, const char *prop, 30 unsigned int length, const void *data); 31 int fdt_get_reg_props_by_index(const void *dtb, int node, int index, 32 uintptr_t *base, size_t *size); 33 int fdt_get_reg_props_by_name(const void *dtb, int node, const char *name, 34 uintptr_t *base, size_t *size); 35 int fdt_get_stdout_node_offset(const void *dtb); 36 37 uint64_t fdtw_translate_address(const void *dtb, int bus_node, 38 uint64_t base_address); 39 40 #endif /* FDT_WRAPPERS_H */ 41