common/fdt_support.c

/*
 * (C) Copyright 2007
 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <stdio_dev.h>
#include <linux/ctype.h>
#include <linux/types.h>
#include <asm/global_data.h>
#include <fdt.h>
#include <libfdt.h>
#include <fdt_support.h>
#include <exports.h>

/*
 * Global data (for the gd->bd)
 */
DECLARE_GLOBAL_DATA_PTR;

/**
 * fdt_getprop_u32_default - Find a node and return it's property or a default
 *
 * @fdt: ptr to device tree
 * @path: path of node
 * @prop: property name
 * @dflt: default value if the property isn't found
 *
 * Convenience function to find a node and return it's property or a
 * default value if it doesn't exist.
 */
u32 fdt_getprop_u32_default(void *fdt, const char *path, const char *prop,
				const u32 dflt)
{
	const u32 *val;
	int off;

	off = fdt_path_offset(fdt, path);
	if (off < 0)
		return dflt;

	val = fdt_getprop(fdt, off, prop, NULL);
	if (val)
		return *val;
	else
		return dflt;
}

/**
 * fdt_find_and_setprop: Find a node and set it's property
 *
 * @fdt: ptr to device tree
 * @node: path of node
 * @prop: property name
 * @val: ptr to new value
 * @len: length of new property value
 * @create: flag to create the property if it doesn't exist
 *
 * Convenience function to directly set a property given the path to the node.
 */
int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
			 const void *val, int len, int create)
{
	int nodeoff = fdt_path_offset(fdt, node);

	if (nodeoff < 0)
		return nodeoff;

	if ((!create) && (fdt_get_property(fdt, nodeoff, prop, 0) == NULL))
		return 0; /* create flag not set; so exit quietly */

	return fdt_setprop(fdt, nodeoff, prop, val, len);
}

#ifdef CONFIG_OF_STDOUT_VIA_ALIAS

#ifdef CONFIG_SERIAL_MULTI
static void fdt_fill_multisername(char *sername, size_t maxlen)
{
	const char *outname = stdio_devices[stdout]->name;

	if (strcmp(outname, "serial") > 0)
		strncpy(sername, outname, maxlen);

	/* eserial? */
	if (strcmp(outname + 1, "serial") > 0)
		strncpy(sername, outname + 1, maxlen);
}
#else
static inline void fdt_fill_multisername(char *sername, size_t maxlen) {}
#endif /* CONFIG_SERIAL_MULTI */

static int fdt_fixup_stdout(void *fdt, int chosenoff)
{
	int err = 0;
#ifdef CONFIG_CONS_INDEX
	int node;
	char sername[9] = { 0 };
	const char *path;

	fdt_fill_multisername(sername, sizeof(sername) - 1);
	if (!sername[0])
		sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1);

	err = node = fdt_path_offset(fdt, "/aliases");
	if (node >= 0) {
		int len;
		path = fdt_getprop(fdt, node, sername, &len);
		if (path) {
			char *p = malloc(len);
			err = -FDT_ERR_NOSPACE;
			if (p) {
				memcpy(p, path, len);
				err = fdt_setprop(fdt, chosenoff,
					"linux,stdout-path", p, len);
				free(p);
			}
		} else {
			err = len;
		}
	}
#endif
	if (err < 0)
		printf("WARNING: could not set linux,stdout-path %s.\n",
				fdt_strerror(err));

	return err;
}
#endif

int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end, int force)
{
	int   nodeoffset;
	int   err, j, total;
	u32   tmp;
	const char *path;
	uint64_t addr, size;

	/* Find the "chosen" node.  */
	nodeoffset = fdt_path_offset (fdt, "/chosen");

	/* If there is no "chosen" node in the blob return */
	if (nodeoffset < 0) {
		printf("fdt_initrd: %s\n", fdt_strerror(nodeoffset));
		return nodeoffset;
	}

	/* just return if initrd_start/end aren't valid */
	if ((initrd_start == 0) || (initrd_end == 0))
		return 0;

	total = fdt_num_mem_rsv(fdt);

	/*
	 * Look for an existing entry and update it.  If we don't find
	 * the entry, we will j be the next available slot.
	 */
	for (j = 0; j < total; j++) {
		err = fdt_get_mem_rsv(fdt, j, &addr, &size);
		if (addr == initrd_start) {
			fdt_del_mem_rsv(fdt, j);
			break;
		}
	}

	err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start + 1);
	if (err < 0) {
		printf("fdt_initrd: %s\n", fdt_strerror(err));
		return err;
	}

	path = fdt_getprop(fdt, nodeoffset, "linux,initrd-start", NULL);
	if ((path == NULL) || force) {
		tmp = __cpu_to_be32(initrd_start);
		err = fdt_setprop(fdt, nodeoffset,
			"linux,initrd-start", &tmp, sizeof(tmp));
		if (err < 0) {
			printf("WARNING: "
				"could not set linux,initrd-start %s.\n",
				fdt_strerror(err));
			return err;
		}
		tmp = __cpu_to_be32(initrd_end);
		err = fdt_setprop(fdt, nodeoffset,
			"linux,initrd-end", &tmp, sizeof(tmp));
		if (err < 0) {
			printf("WARNING: could not set linux,initrd-end %s.\n",
				fdt_strerror(err));

			return err;
		}
	}

	return 0;
}

int fdt_chosen(void *fdt, int force)
{
	int   nodeoffset;
	int   err;
	char  *str;		/* used to set string properties */
	const char *path;

	err = fdt_check_header(fdt);
	if (err < 0) {
		printf("fdt_chosen: %s\n", fdt_strerror(err));
		return err;
	}

	/*
	 * Find the "chosen" node.
	 */
	nodeoffset = fdt_path_offset (fdt, "/chosen");

	/*
	 * If there is no "chosen" node in the blob, create it.
	 */
	if (nodeoffset < 0) {
		/*
		 * Create a new node "/chosen" (offset 0 is root level)
		 */
		nodeoffset = fdt_add_subnode(fdt, 0, "chosen");
		if (nodeoffset < 0) {
			printf("WARNING: could not create /chosen %s.\n",
				fdt_strerror(nodeoffset));
			return nodeoffset;
		}
	}

	/*
	 * Create /chosen properites that don't exist in the fdt.
	 * If the property exists, update it only if the "force" parameter
	 * is true.
	 */
	str = getenv("bootargs");
	if (str != NULL) {
		path = fdt_getprop(fdt, nodeoffset, "bootargs", NULL);
		if ((path == NULL) || force) {
			err = fdt_setprop(fdt, nodeoffset,
				"bootargs", str, strlen(str)+1);
			if (err < 0)
				printf("WARNING: could not set bootargs %s.\n",
					fdt_strerror(err));
		}
	}

#ifdef CONFIG_OF_STDOUT_VIA_ALIAS
	path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL);
	if ((path == NULL) || force)
		err = fdt_fixup_stdout(fdt, nodeoffset);
#endif

#ifdef OF_STDOUT_PATH
	path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL);
	if ((path == NULL) || force) {
		err = fdt_setprop(fdt, nodeoffset,
			"linux,stdout-path", OF_STDOUT_PATH, strlen(OF_STDOUT_PATH)+1);
		if (err < 0)
			printf("WARNING: could not set linux,stdout-path %s.\n",
				fdt_strerror(err));
	}
#endif

	return err;
}

void do_fixup_by_path(void *fdt, const char *path, const char *prop,
		      const void *val, int len, int create)
{
#if defined(DEBUG)
	int i;
	debug("Updating property '%s/%s' = ", path, prop);
	for (i = 0; i < len; i++)
		debug(" %.2x", *(u8*)(val+i));
	debug("\n");
#endif
	int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create);
	if (rc)
		printf("Unable to update property %s:%s, err=%s\n",
			path, prop, fdt_strerror(rc));
}

void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop,
			  u32 val, int create)
{
	val = cpu_to_fdt32(val);
	do_fixup_by_path(fdt, path, prop, &val, sizeof(val), create);
}

void do_fixup_by_prop(void *fdt,
		      const char *pname, const void *pval, int plen,
		      const char *prop, const void *val, int len,
		      int create)
{
	int off;
#if defined(DEBUG)
	int i;
	debug("Updating property '%s' = ", prop);
	for (i = 0; i < len; i++)
		debug(" %.2x", *(u8*)(val+i));
	debug("\n");
#endif
	off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen);
	while (off != -FDT_ERR_NOTFOUND) {
		if (create || (fdt_get_property(fdt, off, prop, 0) != NULL))
			fdt_setprop(fdt, off, prop, val, len);
		off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen);
	}
}

void do_fixup_by_prop_u32(void *fdt,
			  const char *pname, const void *pval, int plen,
			  const char *prop, u32 val, int create)
{
	val = cpu_to_fdt32(val);
	do_fixup_by_prop(fdt, pname, pval, plen, prop, &val, 4, create);
}

void do_fixup_by_compat(void *fdt, const char *compat,
			const char *prop, const void *val, int len, int create)
{
	int off = -1;
#if defined(DEBUG)
	int i;
	debug("Updating property '%s' = ", prop);
	for (i = 0; i < len; i++)
		debug(" %.2x", *(u8*)(val+i));
	debug("\n");
#endif
	off = fdt_node_offset_by_compatible(fdt, -1, compat);
	while (off != -FDT_ERR_NOTFOUND) {
		if (create || (fdt_get_property(fdt, off, prop, 0) != NULL))
			fdt_setprop(fdt, off, prop, val, len);
		off = fdt_node_offset_by_compatible(fdt, off, compat);
	}
}

void do_fixup_by_compat_u32(void *fdt, const char *compat,
			    const char *prop, u32 val, int create)
{
	val = cpu_to_fdt32(val);
	do_fixup_by_compat(fdt, compat, prop, &val, 4, create);
}

int fdt_fixup_memory(void *blob, u64 start, u64 size)
{
	int err, nodeoffset, len = 0;
	u8 tmp[16];
	const u32 *addrcell, *sizecell;

	err = fdt_check_header(blob);
	if (err < 0) {
		printf("%s: %s\n", __FUNCTION__, fdt_strerror(err));
		return err;
	}

	/* update, or add and update /memory node */
	nodeoffset = fdt_path_offset(blob, "/memory");
	if (nodeoffset < 0) {
		nodeoffset = fdt_add_subnode(blob, 0, "memory");
		if (nodeoffset < 0)
			printf("WARNING: could not create /memory: %s.\n",
					fdt_strerror(nodeoffset));
		return nodeoffset;
	}
	err = fdt_setprop(blob, nodeoffset, "device_type", "memory",
			sizeof("memory"));
	if (err < 0) {
		printf("WARNING: could not set %s %s.\n", "device_type",
				fdt_strerror(err));
		return err;
	}

	addrcell = fdt_getprop(blob, 0, "#address-cells", NULL);
	/* use shifts and mask to ensure endianness */
	if ((addrcell) && (*addrcell == 2)) {
		tmp[0] = (start >> 56) & 0xff;
		tmp[1] = (start >> 48) & 0xff;
		tmp[2] = (start >> 40) & 0xff;
		tmp[3] = (start >> 32) & 0xff;
		tmp[4] = (start >> 24) & 0xff;
		tmp[5] = (start >> 16) & 0xff;
		tmp[6] = (start >>  8) & 0xff;
		tmp[7] = (start      ) & 0xff;
		len = 8;
	} else {
		tmp[0] = (start >> 24) & 0xff;
		tmp[1] = (start >> 16) & 0xff;
		tmp[2] = (start >>  8) & 0xff;
		tmp[3] = (start      ) & 0xff;
		len = 4;
	}

	sizecell = fdt_getprop(blob, 0, "#size-cells", NULL);
	/* use shifts and mask to ensure endianness */
	if ((sizecell) && (*sizecell == 2)) {
		tmp[0+len] = (size >> 56) & 0xff;
		tmp[1+len] = (size >> 48) & 0xff;
		tmp[2+len] = (size >> 40) & 0xff;
		tmp[3+len] = (size >> 32) & 0xff;
		tmp[4+len] = (size >> 24) & 0xff;
		tmp[5+len] = (size >> 16) & 0xff;
		tmp[6+len] = (size >>  8) & 0xff;
		tmp[7+len] = (size      ) & 0xff;
		len += 8;
	} else {
		tmp[0+len] = (size >> 24) & 0xff;
		tmp[1+len] = (size >> 16) & 0xff;
		tmp[2+len] = (size >>  8) & 0xff;
		tmp[3+len] = (size      ) & 0xff;
		len += 4;
	}

	err = fdt_setprop(blob, nodeoffset, "reg", tmp, len);
	if (err < 0) {
		printf("WARNING: could not set %s %s.\n",
				"reg", fdt_strerror(err));
		return err;
	}
	return 0;
}

void fdt_fixup_ethernet(void *fdt)
{
	int node, i, j;
	char enet[16], *tmp, *end;
	char mac[16] = "ethaddr";
	const char *path;
	unsigned char mac_addr[6];

	node = fdt_path_offset(fdt, "/aliases");
	if (node < 0)
		return;

	i = 0;
	while ((tmp = getenv(mac)) != NULL) {
		sprintf(enet, "ethernet%d", i);
		path = fdt_getprop(fdt, node, enet, NULL);
		if (!path) {
			debug("No alias for %s\n", enet);
			sprintf(mac, "eth%daddr", ++i);
			continue;
		}

		for (j = 0; j < 6; j++) {
			mac_addr[j] = tmp ? simple_strtoul(tmp, &end, 16) : 0;
			if (tmp)
				tmp = (*end) ? end+1 : end;
		}

		do_fixup_by_path(fdt, path, "mac-address", &mac_addr, 6, 0);
		do_fixup_by_path(fdt, path, "local-mac-address",
				&mac_addr, 6, 1);

		sprintf(mac, "eth%daddr", ++i);
	}
}

#ifdef CONFIG_HAS_FSL_DR_USB
void fdt_fixup_dr_usb(void *blob, bd_t *bd)
{
	char *mode;
	char *type;
	const char *compat = "fsl-usb2-dr";
	const char *prop_mode = "dr_mode";
	const char *prop_type = "phy_type";
	int node_offset;
	int err;

	mode = getenv("usb_dr_mode");
	type = getenv("usb_phy_type");
	if (!mode && !type)
		return;

	node_offset = fdt_node_offset_by_compatible(blob, 0, compat);
	if (node_offset < 0) {
		printf("WARNING: could not find compatible node %s: %s.\n",
			compat, fdt_strerror(node_offset));
		return;
	}

	if (mode) {
		err = fdt_setprop(blob, node_offset, prop_mode, mode,
				  strlen(mode) + 1);
		if (err < 0)
			printf("WARNING: could not set %s for %s: %s.\n",
			       prop_mode, compat, fdt_strerror(err));
	}

	if (type) {
		err = fdt_setprop(blob, node_offset, prop_type, type,
				  strlen(type) + 1);
		if (err < 0)
			printf("WARNING: could not set %s for %s: %s.\n",
			       prop_type, compat, fdt_strerror(err));
	}
}
#endif /* CONFIG_HAS_FSL_DR_USB */

#if defined(CONFIG_MPC83xx) || defined(CONFIG_MPC85xx)
/*
 * update crypto node properties to a specified revision of the SEC
 * called with sec_rev == 0 if not on an mpc8xxxE processor
 */
void fdt_fixup_crypto_node(void *blob, int sec_rev)
{
	const struct sec_rev_prop {
		u32 sec_rev;
		u32 num_channels;
		u32 channel_fifo_len;
		u32 exec_units_mask;
		u32 descriptor_types_mask;
	} sec_rev_prop_list [] = {
		{ 0x0200, 4, 24, 0x07e, 0x01010ebf }, /* SEC 2.0 */
		{ 0x0201, 4, 24, 0x0fe, 0x012b0ebf }, /* SEC 2.1 */
		{ 0x0202, 1, 24, 0x04c, 0x0122003f }, /* SEC 2.2 */
		{ 0x0204, 4, 24, 0x07e, 0x012b0ebf }, /* SEC 2.4 */
		{ 0x0300, 4, 24, 0x9fe, 0x03ab0ebf }, /* SEC 3.0 */
		{ 0x0303, 4, 24, 0x97c, 0x03ab0abf }, /* SEC 3.3 */
	};
	char compat_strlist[ARRAY_SIZE(sec_rev_prop_list) *
			    sizeof("fsl,secX.Y")];
	int crypto_node, sec_idx, err;
	char *p;
	u32 val;

	/* locate crypto node based on lowest common compatible */
	crypto_node = fdt_node_offset_by_compatible(blob, -1, "fsl,sec2.0");
	if (crypto_node == -FDT_ERR_NOTFOUND)
		return;

	/* delete it if not on an E-processor */
	if (crypto_node > 0 && !sec_rev) {
		fdt_del_node(blob, crypto_node);
		return;
	}

	/* else we got called for possible uprev */
	for (sec_idx = 0; sec_idx < ARRAY_SIZE(sec_rev_prop_list); sec_idx++)
		if (sec_rev_prop_list[sec_idx].sec_rev == sec_rev)
			break;

	if (sec_idx == ARRAY_SIZE(sec_rev_prop_list)) {
		puts("warning: unknown SEC revision number\n");
		return;
	}

	val = cpu_to_fdt32(sec_rev_prop_list[sec_idx].num_channels);
	err = fdt_setprop(blob, crypto_node, "fsl,num-channels", &val, 4);
	if (err < 0)
		printf("WARNING: could not set crypto property: %s\n",
		       fdt_strerror(err));

	val = cpu_to_fdt32(sec_rev_prop_list[sec_idx].descriptor_types_mask);
	err = fdt_setprop(blob, crypto_node, "fsl,descriptor-types-mask", &val, 4);
	if (err < 0)
		printf("WARNING: could not set crypto property: %s\n",
		       fdt_strerror(err));

	val = cpu_to_fdt32(sec_rev_prop_list[sec_idx].exec_units_mask);
	err = fdt_setprop(blob, crypto_node, "fsl,exec-units-mask", &val, 4);
	if (err < 0)
		printf("WARNING: could not set crypto property: %s\n",
		       fdt_strerror(err));

	val = cpu_to_fdt32(sec_rev_prop_list[sec_idx].channel_fifo_len);
	err = fdt_setprop(blob, crypto_node, "fsl,channel-fifo-len", &val, 4);
	if (err < 0)
		printf("WARNING: could not set crypto property: %s\n",
		       fdt_strerror(err));

	val = 0;
	while (sec_idx >= 0) {
		p = compat_strlist + val;
		val += sprintf(p, "fsl,sec%d.%d",
			(sec_rev_prop_list[sec_idx].sec_rev & 0xff00) >> 8,
			sec_rev_prop_list[sec_idx].sec_rev & 0x00ff) + 1;
		sec_idx--;
	}
	err = fdt_setprop(blob, crypto_node, "compatible", &compat_strlist, val);
	if (err < 0)
		printf("WARNING: could not set crypto property: %s\n",
		       fdt_strerror(err));
}
#endif /* defined(CONFIG_MPC83xx) || defined(CONFIG_MPC85xx) */

/* Resize the fdt to its actual size + a bit of padding */
int fdt_resize(void *blob)
{
	int i;
	uint64_t addr, size;
	int total, ret;
	uint actualsize;

	if (!blob)
		return 0;

	total = fdt_num_mem_rsv(blob);
	for (i = 0; i < total; i++) {
		fdt_get_mem_rsv(blob, i, &addr, &size);
		if (addr == (uint64_t)(u32)blob) {
			fdt_del_mem_rsv(blob, i);
			break;
		}
	}

	/*
	 * Calculate the actual size of the fdt
	 * plus the size needed for two fdt_add_mem_rsv, one
	 * for the fdt itself and one for a possible initrd
	 */
	actualsize = fdt_off_dt_strings(blob) +
		fdt_size_dt_strings(blob) + 2*sizeof(struct fdt_reserve_entry);

	/* Make it so the fdt ends on a page boundary */
	actualsize = ALIGN(actualsize + ((uint)blob & 0xfff), 0x1000);
	actualsize = actualsize - ((uint)blob & 0xfff);

	/* Change the fdt header to reflect the correct size */
	fdt_set_totalsize(blob, actualsize);

	/* Add the new reservation */
	ret = fdt_add_mem_rsv(blob, (uint)blob, actualsize);
	if (ret < 0)
		return ret;

	return actualsize;
}

#ifdef CONFIG_PCI
#define CONFIG_SYS_PCI_NR_INBOUND_WIN 4

#define FDT_PCI_PREFETCH	(0x40000000)
#define FDT_PCI_MEM32		(0x02000000)
#define FDT_PCI_IO		(0x01000000)
#define FDT_PCI_MEM64		(0x03000000)

int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose) {

	int addrcell, sizecell, len, r;
	u32 *dma_range;
	/* sized based on pci addr cells, size-cells, & address-cells */
	u32 dma_ranges[(3 + 2 + 2) * CONFIG_SYS_PCI_NR_INBOUND_WIN];

	addrcell = fdt_getprop_u32_default(blob, "/", "#address-cells", 1);
	sizecell = fdt_getprop_u32_default(blob, "/", "#size-cells", 1);

	dma_range = &dma_ranges[0];
	for (r = 0; r < hose->region_count; r++) {
		u64 bus_start, phys_start, size;

		/* skip if !PCI_REGION_SYS_MEMORY */
		if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY))
			continue;

		bus_start = (u64)hose->regions[r].bus_start;
		phys_start = (u64)hose->regions[r].phys_start;
		size = (u64)hose->regions[r].size;

		dma_range[0] = 0;
		if (size >= 0x100000000ull)
			dma_range[0] |= FDT_PCI_MEM64;
		else
			dma_range[0] |= FDT_PCI_MEM32;
		if (hose->regions[r].flags & PCI_REGION_PREFETCH)
			dma_range[0] |= FDT_PCI_PREFETCH;
#ifdef CONFIG_SYS_PCI_64BIT
		dma_range[1] = bus_start >> 32;
#else
		dma_range[1] = 0;
#endif
		dma_range[2] = bus_start & 0xffffffff;

		if (addrcell == 2) {
			dma_range[3] = phys_start >> 32;
			dma_range[4] = phys_start & 0xffffffff;
		} else {
			dma_range[3] = phys_start & 0xffffffff;
		}

		if (sizecell == 2) {
			dma_range[3 + addrcell + 0] = size >> 32;
			dma_range[3 + addrcell + 1] = size & 0xffffffff;
		} else {
			dma_range[3 + addrcell + 0] = size & 0xffffffff;
		}

		dma_range += (3 + addrcell + sizecell);
	}

	len = dma_range - &dma_ranges[0];
	if (len)
		fdt_setprop(blob, phb_off, "dma-ranges", &dma_ranges[0], len*4);

	return 0;
}
#endif

#ifdef CONFIG_FDT_FIXUP_NOR_FLASH_SIZE
/*
 * This function can be used to update the size in the "reg" property
 * of the NOR FLASH device nodes. This is necessary for boards with
 * non-fixed NOR FLASH sizes.
 */
int fdt_fixup_nor_flash_size(void *blob, int cs, u32 size)
{
	char compat[][16] = { "cfi-flash", "jedec-flash" };
	int off;
	int len;
	struct fdt_property *prop;
	u32 *reg;
	int i;

	for (i = 0; i < 2; i++) {
		off = fdt_node_offset_by_compatible(blob, -1, compat[i]);
		while (off != -FDT_ERR_NOTFOUND) {
			/*
			 * Found one compatible node, now check if this one
			 * has the correct CS
			 */
			prop = fdt_get_property_w(blob, off, "reg", &len);
			if (prop) {
				reg = (u32 *)&prop->data[0];
				if (reg[0] == cs) {
					reg[2] = size;
					fdt_setprop(blob, off, "reg", reg,
						    3 * sizeof(u32));

					return 0;
				}
			}

			/* Move to next compatible node */
			off = fdt_node_offset_by_compatible(blob, off,
							    compat[i]);
		}
	}

	return -1;
}
#endif