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Filename : of_pdt.h
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/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Definitions for building a device tree by calling into the
 * Open Firmware PROM.
 *
 * Copyright (C) 2010  Andres Salomon <dilinger@queued.net>
 */

#ifndef _LINUX_OF_PDT_H
#define _LINUX_OF_PDT_H

/* overridable operations for calling into the PROM */
struct of_pdt_ops {
	/*
	 * buf should be 32 bytes; return 0 on success.
	 * If prev is NULL, the first property will be returned.
	 */
	int (*nextprop)(phandle node, char *prev, char *buf);

	/* for both functions, return proplen on success; -1 on error */
	int (*getproplen)(phandle node, const char *prop);
	int (*getproperty)(phandle node, const char *prop, char *buf,
			int bufsize);

	/* phandles are 0 if no child or sibling exists */
	phandle (*getchild)(phandle parent);
	phandle (*getsibling)(phandle node);

	/* return 0 on success; fill in 'len' with number of bytes in path */
	int (*pkg2path)(phandle node, char *buf, const int buflen, int *len);
};

extern void *prom_early_alloc(unsigned long size);

/* for building the device tree */
extern void of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops);

#endif /* _LINUX_OF_PDT_H */