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authorKumar Gala <galak@kernel.crashing.org>2007-10-24 11:04:22 -0500
committerKumar Gala <galak@kernel.crashing.org>2007-11-21 14:04:05 -0600
commit8d04f02f6224e6983f4812ea4da704950ec8539c (patch)
tree0e3193813d29fe82231ad618075efe257b2925f1 /libfdt/fdt_ro.c
parente93becf80d732b64aef81b23e8b6ece02c40533d (diff)
downloadu-boot-linaro-stable-8d04f02f6224e6983f4812ea4da704950ec8539c.tar.gz
Update libfdt from device tree compiler (dtc)
Update libfdt to commit 8eaf5e358366017aa2e846c5038d1aa19958314e from the device tree compiler (dtc) project. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'libfdt/fdt_ro.c')
-rw-r--r--libfdt/fdt_ro.c628
1 files changed, 396 insertions, 232 deletions
diff --git a/libfdt/fdt_ro.c b/libfdt/fdt_ro.c
index 5816c7a29..12a37d59f 100644
--- a/libfdt/fdt_ro.c
+++ b/libfdt/fdt_ro.c
@@ -2,19 +2,51 @@
* libfdt - Flat Device Tree manipulation
* Copyright (C) 2006 David Gibson, IBM Corporation.
*
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public License
- * as published by the Free Software Foundation; either version 2.1 of
- * the License, or (at your option) any later version.
+ * libfdt is dual licensed: you can use it either under the terms of
+ * the GPL, or the BSD license, at your option.
*
- * This library 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
- * Lesser General Public License for more details.
+ * a) This library 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.
*
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ * This library 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 library; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ *
+ * Alternatively,
+ *
+ * b) Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ * 2. Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "libfdt_env.h"
@@ -23,14 +55,15 @@
#include "libfdt_internal.h"
-#define CHECK_HEADER(fdt) { \
- int err; \
- if ((err = fdt_check_header(fdt)) != 0) \
- return err; \
-}
+#define CHECK_HEADER(fdt) \
+ { \
+ int err; \
+ if ((err = fdt_check_header(fdt)) != 0) \
+ return err; \
+ }
-static int offset_streq(const void *fdt, int offset,
- const char *s, int len)
+static int nodename_eq(const void *fdt, int offset,
+ const char *s, int len)
{
const char *p = fdt_offset_ptr(fdt, offset, len+1);
@@ -41,57 +74,36 @@ static int offset_streq(const void *fdt, int offset,
if (memcmp(p, s, len) != 0)
return 0;
- if (p[len] != '\0')
+ if (p[len] == '\0')
+ return 1;
+ else if (!memchr(s, '@', len) && (p[len] == '@'))
+ return 1;
+ else
return 0;
-
- return 1;
}
-/*
- * Checks if the property name matches.
- */
-static int prop_name_eq(const void *fdt, int offset, const char *name,
- struct fdt_property **prop, int *lenp)
+const char *fdt_string(const void *fdt, int stroffset)
{
- int namestroff, len;
-
- *prop = fdt_offset_ptr_typed(fdt, offset, *prop);
- if (! *prop)
- return -FDT_ERR_BADSTRUCTURE;
+ return (char *)fdt + fdt_off_dt_strings(fdt) + stroffset;
+}
- namestroff = fdt32_to_cpu((*prop)->nameoff);
- if (streq(fdt_string(fdt, namestroff), name)) {
- len = fdt32_to_cpu((*prop)->len);
- *prop = fdt_offset_ptr(fdt, offset,
- sizeof(**prop) + len);
- if (*prop) {
- if (lenp)
- *lenp = len;
- return 1;
- } else
- return -FDT_ERR_BADSTRUCTURE;
- }
+int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size)
+{
+ CHECK_HEADER(fdt);
+ *address = fdt64_to_cpu(_fdt_mem_rsv(fdt, n)->address);
+ *size = fdt64_to_cpu(_fdt_mem_rsv(fdt, n)->size);
return 0;
}
-/*
- * Return a pointer to the string at the given string offset.
- */
-char *fdt_string(const void *fdt, int stroffset)
+int fdt_num_mem_rsv(const void *fdt)
{
- return (char *)fdt + fdt_off_dt_strings(fdt) + stroffset;
+ int i = 0;
+
+ while (fdt64_to_cpu(_fdt_mem_rsv(fdt, i)->size) != 0)
+ i++;
+ return i;
}
-/*
- * Return the node offset of the node specified by:
- * parentoffset - starting place (0 to start at the root)
- * name - name being searched for
- * namelen - length of the name: typically strlen(name)
- *
- * Notes:
- * If the start node has subnodes, the subnodes are _not_ searched for the
- * requested name.
- */
int fdt_subnode_offset_namelen(const void *fdt, int parentoffset,
const char *name, int namelen)
{
@@ -101,13 +113,13 @@ int fdt_subnode_offset_namelen(const void *fdt, int parentoffset,
CHECK_HEADER(fdt);
- tag = fdt_next_tag(fdt, parentoffset, &nextoffset, NULL);
+ tag = fdt_next_tag(fdt, parentoffset, &nextoffset);
if (tag != FDT_BEGIN_NODE)
return -FDT_ERR_BADOFFSET;
do {
offset = nextoffset;
- tag = fdt_next_tag(fdt, offset, &nextoffset, NULL);
+ tag = fdt_next_tag(fdt, offset, &nextoffset);
switch (tag) {
case FDT_END:
@@ -115,15 +127,10 @@ int fdt_subnode_offset_namelen(const void *fdt, int parentoffset,
case FDT_BEGIN_NODE:
level++;
- /*
- * If we are nested down levels, ignore the strings
- * until we get back to the proper level.
- */
if (level != 1)
continue;
-
- /* Return the offset if this is "our" string. */
- if (offset_streq(fdt, offset+FDT_TAGSIZE, name, namelen))
+ if (nodename_eq(fdt, offset+FDT_TAGSIZE, name, namelen))
+ /* Found it! */
return offset;
break;
@@ -143,20 +150,13 @@ int fdt_subnode_offset_namelen(const void *fdt, int parentoffset,
return -FDT_ERR_NOTFOUND;
}
-/*
- * See fdt_subnode_offset_namelen()
- */
int fdt_subnode_offset(const void *fdt, int parentoffset,
const char *name)
{
return fdt_subnode_offset_namelen(fdt, parentoffset, name, strlen(name));
}
-/*
- * Searches for the node corresponding to the given path and returns the
- * offset of that node.
- */
-int fdt_find_node_by_path(const void *fdt, const char *path)
+int fdt_path_offset(const void *fdt, const char *path)
{
const char *end = path + strlen(path);
const char *p = path;
@@ -164,37 +164,21 @@ int fdt_find_node_by_path(const void *fdt, const char *path)
CHECK_HEADER(fdt);
- /* Paths must be absolute */
if (*path != '/')
return -FDT_ERR_BADPATH;
- /* Handle the root path: root offset is 0 */
- if (strcmp(path, "/") == 0)
- return 0;
-
while (*p) {
const char *q;
- /* Skip path separator(s) */
while (*p == '/')
p++;
if (! *p)
- return -FDT_ERR_BADPATH;
-
- /*
- * Find the next path separator. The characters between
- * p and q are the next segment of the the path to find.
- */
+ return offset;
q = strchr(p, '/');
if (! q)
q = end;
- /*
- * Find the offset corresponding to the this path segment.
- */
offset = fdt_subnode_offset_namelen(fdt, offset, p, q-p);
-
- /* Oops, error, abort abort abort */
if (offset < 0)
return offset;
@@ -204,17 +188,37 @@ int fdt_find_node_by_path(const void *fdt, const char *path)
return offset;
}
-/*
- * Given the offset of a node and a name of a property in that node, return
- * a pointer to the property struct.
- */
-struct fdt_property *fdt_get_property(const void *fdt,
- int nodeoffset,
- const char *name, int *lenp)
+const char *fdt_get_name(const void *fdt, int nodeoffset, int *len)
+{
+ const struct fdt_node_header *nh;
+ int err;
+
+ if ((err = fdt_check_header(fdt)) != 0)
+ goto fail;
+
+ err = -FDT_ERR_BADOFFSET;
+ nh = fdt_offset_ptr(fdt, nodeoffset, sizeof(*nh));
+ if (!nh || (fdt32_to_cpu(nh->tag) != FDT_BEGIN_NODE))
+ goto fail;
+
+ if (len)
+ *len = strlen(nh->name);
+
+ return nh->name;
+
+ fail:
+ if (len)
+ *len = err;
+ return NULL;
+}
+
+const struct fdt_property *fdt_get_property(const void *fdt,
+ int nodeoffset,
+ const char *name, int *lenp)
{
- int level = 0;
uint32_t tag;
- struct fdt_property *prop;
+ const struct fdt_property *prop;
+ int namestroff;
int offset, nextoffset;
int err;
@@ -225,63 +229,59 @@ struct fdt_property *fdt_get_property(const void *fdt,
if (nodeoffset % FDT_TAGSIZE)
goto fail;
- tag = fdt_next_tag(fdt, nodeoffset, &nextoffset, NULL);
+ tag = fdt_next_tag(fdt, nodeoffset, &nextoffset);
if (tag != FDT_BEGIN_NODE)
goto fail;
do {
offset = nextoffset;
- tag = fdt_next_tag(fdt, offset, &nextoffset, NULL);
+ tag = fdt_next_tag(fdt, offset, &nextoffset);
switch (tag) {
case FDT_END:
err = -FDT_ERR_TRUNCATED;
goto fail;
case FDT_BEGIN_NODE:
- level++;
- break;
-
case FDT_END_NODE:
- level--;
+ case FDT_NOP:
break;
case FDT_PROP:
- /*
- * If we are nested down levels, ignore the strings
- * until we get back to the proper level.
- */
- if (level != 0)
- continue;
-
- err = prop_name_eq(fdt, offset, name, &prop, lenp);
- if (err > 0)
- return prop;
- else if (err < 0)
+ err = -FDT_ERR_BADSTRUCTURE;
+ prop = fdt_offset_ptr(fdt, offset, sizeof(*prop));
+ if (! prop)
goto fail;
- break;
+ namestroff = fdt32_to_cpu(prop->nameoff);
+ if (streq(fdt_string(fdt, namestroff), name)) {
+ /* Found it! */
+ int len = fdt32_to_cpu(prop->len);
+ prop = fdt_offset_ptr(fdt, offset,
+ sizeof(*prop)+len);
+ if (! prop)
+ goto fail;
+
+ if (lenp)
+ *lenp = len;
- case FDT_NOP:
+ return prop;
+ }
break;
default:
err = -FDT_ERR_BADSTRUCTURE;
goto fail;
}
- } while (level >= 0);
+ } while ((tag != FDT_BEGIN_NODE) && (tag != FDT_END_NODE));
err = -FDT_ERR_NOTFOUND;
-fail:
+ fail:
if (lenp)
*lenp = err;
return NULL;
}
-/*
- * Given the offset of a node and a name of a property in that node, return
- * a pointer to the property data (ONLY).
- */
-void *fdt_getprop(const void *fdt, int nodeoffset,
+const void *fdt_getprop(const void *fdt, int nodeoffset,
const char *name, int *lenp)
{
const struct fdt_property *prop;
@@ -290,130 +290,294 @@ void *fdt_getprop(const void *fdt, int nodeoffset,
if (! prop)
return NULL;
- return (void *)prop->data;
+ return prop->data;
}
+uint32_t fdt_get_phandle(const void *fdt, int nodeoffset)
+{
+ const uint32_t *php;
+ int len;
-uint32_t fdt_next_tag(const void *fdt, int offset, int *nextoffset, char **namep)
+ php = fdt_getprop(fdt, nodeoffset, "linux,phandle", &len);
+ if (!php || (len != sizeof(*php)))
+ return 0;
+
+ return fdt32_to_cpu(*php);
+}
+
+int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen)
{
- const uint32_t *tagp, *lenp;
uint32_t tag;
- const char *p;
-
- if (offset % FDT_TAGSIZE)
- return -1;
-
- tagp = fdt_offset_ptr(fdt, offset, FDT_TAGSIZE);
- if (! tagp)
- return FDT_END; /* premature end */
- tag = fdt32_to_cpu(*tagp);
- offset += FDT_TAGSIZE;
-
- switch (tag) {
- case FDT_BEGIN_NODE:
- if(namep)
- *namep = fdt_offset_ptr(fdt, offset, 1);
-
- /* skip name */
- do {
- p = fdt_offset_ptr(fdt, offset++, 1);
- } while (p && (*p != '\0'));
- if (! p)
- return FDT_END;
- break;
- case FDT_PROP:
- lenp = fdt_offset_ptr(fdt, offset, sizeof(*lenp));
- if (! lenp)
- return FDT_END;
- /*
- * Get the property and set the namep to the name.
- */
- if(namep) {
- struct fdt_property *prop;
-
- prop = fdt_offset_ptr_typed(fdt, offset - FDT_TAGSIZE, prop);
- if (! prop)
- return -FDT_ERR_BADSTRUCTURE;
- *namep = fdt_string(fdt, fdt32_to_cpu(prop->nameoff));
+ int p = 0, overflow = 0;
+ int offset, nextoffset, namelen;
+ const char *name;
+
+ CHECK_HEADER(fdt);
+
+ tag = fdt_next_tag(fdt, 0, &nextoffset);
+ if (tag != FDT_BEGIN_NODE)
+ return -FDT_ERR_BADSTRUCTURE;
+
+ if (buflen < 2)
+ return -FDT_ERR_NOSPACE;
+ buf[0] = '/';
+ p = 1;
+
+ while (nextoffset <= nodeoffset) {
+ offset = nextoffset;
+ tag = fdt_next_tag(fdt, offset, &nextoffset);
+ switch (tag) {
+ case FDT_END:
+ return -FDT_ERR_BADOFFSET;
+
+ case FDT_BEGIN_NODE:
+ name = fdt_get_name(fdt, offset, &namelen);
+ if (!name)
+ return namelen;
+ if (overflow || ((p + namelen + 1) > buflen)) {
+ overflow++;
+ break;
+ }
+ memcpy(buf + p, name, namelen);
+ p += namelen;
+ buf[p++] = '/';
+ break;
+
+ case FDT_END_NODE:
+ if (overflow) {
+ overflow--;
+ break;
+ }
+ do {
+ p--;
+ } while (buf[p-1] != '/');
+ break;
+
+ case FDT_PROP:
+ case FDT_NOP:
+ break;
+
+ default:
+ return -FDT_ERR_BADSTRUCTURE;
}
- /* skip name offset, length and value */
- offset += 2*FDT_TAGSIZE + fdt32_to_cpu(*lenp);
- break;
}
- if (nextoffset)
- *nextoffset = ALIGN(offset, FDT_TAGSIZE);
+ if (overflow)
+ return -FDT_ERR_NOSPACE;
- return tag;
+ if (p > 1) /* special case so that root path is "/", not "" */
+ p--;
+ buf[p] = '\0';
+ return p;
}
-/*
- * Return the number of used reserve map entries and total slots available.
- */
-int fdt_num_reservemap(void *fdt, int *used, int *total)
+int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset,
+ int supernodedepth, int *nodedepth)
+{
+ int level = -1;
+ uint32_t tag;
+ int offset, nextoffset = 0;
+ int supernodeoffset = -FDT_ERR_INTERNAL;
+
+ CHECK_HEADER(fdt);
+
+ if (supernodedepth < 0)
+ return -FDT_ERR_NOTFOUND;
+
+ do {
+ offset = nextoffset;
+ tag = fdt_next_tag(fdt, offset, &nextoffset);
+ switch (tag) {
+ case FDT_END:
+ return -FDT_ERR_BADOFFSET;
+
+ case FDT_BEGIN_NODE:
+ level++;
+ if (level == supernodedepth)
+ supernodeoffset = offset;
+ break;
+
+ case FDT_END_NODE:
+ level--;
+ break;
+
+ case FDT_PROP:
+ case FDT_NOP:
+ break;
+
+ default:
+ return -FDT_ERR_BADSTRUCTURE;
+ }
+ } while (offset < nodeoffset);
+
+ if (nodedepth)
+ *nodedepth = level;
+
+ if (supernodedepth > level)
+ return -FDT_ERR_NOTFOUND;
+ return supernodeoffset;
+}
+
+int fdt_node_depth(const void *fdt, int nodeoffset)
{
- struct fdt_reserve_entry *re;
- int start;
- int end;
- int err = fdt_check_header(fdt);
-
- if (err != 0)
- return err;
-
- start = fdt_off_mem_rsvmap(fdt);
-
- /*
- * Convention is that the reserve map is before the dt_struct,
- * but it does not have to be.
- */
- end = fdt_totalsize(fdt);
- if (end > fdt_off_dt_struct(fdt))
- end = fdt_off_dt_struct(fdt);
- if (end > fdt_off_dt_strings(fdt))
- end = fdt_off_dt_strings(fdt);
-
- /*
- * Since the reserved area list is zero terminated, you get one fewer.
- */
- if (total)
- *total = ((end - start) / sizeof(struct fdt_reserve_entry)) - 1;
-
- if (used) {
- *used = 0;
- while (start < end) {
- re = (struct fdt_reserve_entry *)(fdt + start);
- if (re->size == 0)
- return 0; /* zero size terminates the list */
-
- *used += 1;
- start += sizeof(struct fdt_reserve_entry);
+ int nodedepth;
+ int err;
+
+ err = fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, &nodedepth);
+ if (err)
+ return (err < 0) ? err : -FDT_ERR_INTERNAL;
+ return nodedepth;
+}
+
+int fdt_parent_offset(const void *fdt, int nodeoffset)
+{
+ int nodedepth = fdt_node_depth(fdt, nodeoffset);
+
+ if (nodedepth < 0)
+ return nodedepth;
+ return fdt_supernode_atdepth_offset(fdt, nodeoffset,
+ nodedepth - 1, NULL);
+}
+
+int fdt_node_offset_by_prop_value(const void *fdt, int startoffset,
+ const char *propname,
+ const void *propval, int proplen)
+{
+ uint32_t tag;
+ int offset, nextoffset;
+ const void *val;
+ int len;
+
+ CHECK_HEADER(fdt);
+
+ if (startoffset >= 0) {
+ tag = fdt_next_tag(fdt, startoffset, &nextoffset);
+ if (tag != FDT_BEGIN_NODE)
+ return -FDT_ERR_BADOFFSET;
+ } else {
+ nextoffset = 0;
+ }
+
+ /* FIXME: The algorithm here is pretty horrible: we scan each
+ * property of a node in fdt_getprop(), then if that didn't
+ * find what we want, we scan over them again making our way
+ * to the next node. Still it's the easiest to implement
+ * approach; performance can come later. */
+ do {
+ offset = nextoffset;
+ tag = fdt_next_tag(fdt, offset, &nextoffset);
+
+ switch (tag) {
+ case FDT_BEGIN_NODE:
+ val = fdt_getprop(fdt, offset, propname, &len);
+ if (val
+ && (len == proplen)
+ && (memcmp(val, propval, len) == 0))
+ return offset;
+ break;
+
+ case FDT_PROP:
+ case FDT_END:
+ case FDT_END_NODE:
+ case FDT_NOP:
+ break;
+
+ default:
+ return -FDT_ERR_BADSTRUCTURE;
}
- /*
- * If we get here, there was no zero size termination.
- */
- return -FDT_ERR_BADLAYOUT;
+ } while (tag != FDT_END);
+
+ return -FDT_ERR_NOTFOUND;
+}
+
+int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle)
+{
+ if ((phandle == 0) || (phandle == -1))
+ return -FDT_ERR_BADPHANDLE;
+ phandle = cpu_to_fdt32(phandle);
+ return fdt_node_offset_by_prop_value(fdt, -1, "linux,phandle",
+ &phandle, sizeof(phandle));
+}
+
+int _stringlist_contains(const void *strlist, int listlen, const char *str)
+{
+ int len = strlen(str);
+ const void *p;
+
+ while (listlen >= len) {
+ if (memcmp(str, strlist, len+1) == 0)
+ return 1;
+ p = memchr(strlist, '\0', listlen);
+ if (!p)
+ return 0; /* malformed strlist.. */
+ listlen -= (p-strlist) + 1;
+ strlist = p + 1;
}
return 0;
}
-/*
- * Return the nth reserve map entry.
- */
-int fdt_get_reservemap(void *fdt, int n, struct fdt_reserve_entry *re)
+int fdt_node_check_compatible(const void *fdt, int nodeoffset,
+ const char *compatible)
{
- int used;
- int total;
- int err;
+ const void *prop;
+ int len;
- err = fdt_num_reservemap(fdt, &used, &total);
- if (err != 0)
- return err;
+ prop = fdt_getprop(fdt, nodeoffset, "compatible", &len);
+ if (!prop)
+ return len;
+ if (_stringlist_contains(prop, len, compatible))
+ return 0;
+ else
+ return 1;
+}
- if (n >= total)
- return -FDT_ERR_NOSPACE;
- if (re) {
- *re = *(struct fdt_reserve_entry *)
- _fdt_offset_ptr(fdt, n * sizeof(struct fdt_reserve_entry));
+int fdt_node_offset_by_compatible(const void *fdt, int startoffset,
+ const char *compatible)
+{
+ uint32_t tag;
+ int offset, nextoffset;
+ int err;
+
+ CHECK_HEADER(fdt);
+
+ if (startoffset >= 0) {
+ tag = fdt_next_tag(fdt, startoffset, &nextoffset);
+ if (tag != FDT_BEGIN_NODE)
+ return -FDT_ERR_BADOFFSET;
+ } else {
+ nextoffset = 0;
}
- return 0;
+
+ /* FIXME: The algorithm here is pretty horrible: we scan each
+ * property of a node in fdt_node_check_compatible(), then if
+ * that didn't find what we want, we scan over them again
+ * making our way to the next node. Still it's the easiest to
+ * implement approach; performance can come later. */
+ do {
+ offset = nextoffset;
+ tag = fdt_next_tag(fdt, offset, &nextoffset);
+
+ switch (tag) {
+ case FDT_BEGIN_NODE:
+ err = fdt_node_check_compatible(fdt, offset,
+ compatible);
+ if ((err < 0)
+ && (err != -FDT_ERR_NOTFOUND))
+ return err;
+ else if (err == 0)
+ return offset;
+ break;
+
+ case FDT_PROP:
+ case FDT_END:
+ case FDT_END_NODE:
+ case FDT_NOP:
+ break;
+
+ default:
+ return -FDT_ERR_BADSTRUCTURE;
+ }
+ } while (tag != FDT_END);
+
+ return -FDT_ERR_NOTFOUND;
}