1e5674e1fSSoby Mathew /* 2e5674e1fSSoby Mathew * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved. 3e5674e1fSSoby Mathew * 4e5674e1fSSoby Mathew * SPDX-License-Identifier: BSD-3-Clause 5e5674e1fSSoby Mathew */ 6e5674e1fSSoby Mathew 7e5674e1fSSoby Mathew /* Helper functions to offer easier navigation of Device Tree Blob */ 8e5674e1fSSoby Mathew 9e5674e1fSSoby Mathew #ifndef __FDT_WRAPPERS__ 10e5674e1fSSoby Mathew #define __FDT_WRAPPERS__ 11e5674e1fSSoby Mathew 12e5674e1fSSoby Mathew /* Number of cells, given total length in bytes. Each cell is 4 bytes long */ 1381542c00SAntonio Nino Diaz #define NCELLS(len) ((len) / 4U) 14e5674e1fSSoby Mathew 15e5674e1fSSoby Mathew int fdtw_read_cells(const void *dtb, int node, const char *prop, 16e5674e1fSSoby Mathew unsigned int cells, void *value); 17*73f1ac6cSAntonio Nino Diaz int fdtw_read_array(const void *dtb, int node, const char *prop, 18*73f1ac6cSAntonio Nino Diaz unsigned int cells, void *value); 1927473620SAntonio Nino Diaz int fdtw_read_string(const void *dtb, int node, const char *prop, 2027473620SAntonio Nino Diaz char *str, size_t size); 21e5674e1fSSoby Mathew int fdtw_write_inplace_cells(void *dtb, int node, const char *prop, 22e5674e1fSSoby Mathew unsigned int cells, void *value); 2327473620SAntonio Nino Diaz 24e5674e1fSSoby Mathew #endif /* __FDT_WRAPPERS__ */ 25