lib/libfdt/fdt_addresses.c

/*
 * libfdt - Flat Device Tree manipulation
 * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au>
 * SPDX-License-Identifier:	GPL-2.0+ BSD-2-Clause
 */
#include <libfdt_env.h>

#ifndef USE_HOSTCC
#include <fdt.h>
#include <libfdt.h>
#else
#include "fdt_host.h"
#endif

#include "libfdt_internal.h"

int fdt_address_cells(const void *fdt, int nodeoffset)
{
	const fdt32_t *ac;
	int val;
	int len;

	ac = fdt_getprop(fdt, nodeoffset, "#address-cells", &len);
	if (!ac)
		return 2;

	if (len != sizeof(*ac))
		return -FDT_ERR_BADNCELLS;

	val = fdt32_to_cpu(*ac);
	if ((val <= 0) || (val > FDT_MAX_NCELLS))
		return -FDT_ERR_BADNCELLS;

	return val;
}

int fdt_size_cells(const void *fdt, int nodeoffset)
{
	const fdt32_t *sc;
	int val;
	int len;

	sc = fdt_getprop(fdt, nodeoffset, "#size-cells", &len);
	if (!sc)
		return 2;

	if (len != sizeof(*sc))
		return -FDT_ERR_BADNCELLS;

	val = fdt32_to_cpu(*sc);
	if ((val < 0) || (val > FDT_MAX_NCELLS))
		return -FDT_ERR_BADNCELLS;

	return val;
}