This patch extends dtc syntax to allow references (&label, or
&{/full/path}) directly within property definitions, rather than
inside a cell list. Such references are expanded to the full path of
the referenced node, as a string, instead of to a phandle as
references within cell lists are evaluated.
A testcase is also included.
Signed-off-by: David Gibson <[EMAIL PROTECTED]>
Index: dtc/tests/run_tests.sh
===================================================================
--- dtc.orig/tests/run_tests.sh 2007-12-05 09:48:12.000000000 +1100
+++ dtc/tests/run_tests.sh 2007-12-05 10:31:51.000000000 +1100
@@ -148,6 +148,9 @@
run_test dtc.sh -I dts -O dtb -o dtc_references_dts0.test.dtb
references_dts0.dts
run_test references dtc_references_dts0.test.dtb
+ run_test dtc.sh -I dts -O dtb -o dtc_path-references.test.dtb
path-references.dts
+ run_test path-references dtc_path-references.test.dtb
+
# Check -Odts mode preserve all dtb information
for tree in test_tree1.dtb dtc_tree1.test.dtb dtc_escapes.test.dtb ; do
run_test dtc.sh -I dtb -O dts -o odts_$tree.test.dts $tree
Index: dtc/dtc-parser.y
===================================================================
--- dtc.orig/dtc-parser.y 2007-12-05 10:18:26.000000000 +1100
+++ dtc/dtc-parser.y 2007-12-05 10:31:51.000000000 +1100
@@ -192,6 +192,10 @@
{
$$ = data_merge($1, $3);
}
+ | propdataprefix DT_REF
+ {
+ $$ = data_add_marker($1, REF_PATH, $2);
+ }
| propdata DT_LABEL
{
$$ = data_add_marker($1, LABEL, $2);
Index: dtc/dtc.h
===================================================================
--- dtc.orig/dtc.h 2007-12-05 09:02:20.000000000 +1100
+++ dtc/dtc.h 2007-12-05 10:32:26.000000000 +1100
@@ -104,6 +104,7 @@
/* Data blobs */
enum markertype {
REF_PHANDLE,
+ REF_PATH,
LABEL,
};
@@ -139,6 +140,8 @@
struct data data_copy_file(FILE *f, size_t len);
struct data data_append_data(struct data d, const void *p, int len);
+struct data data_insert_at_marker(struct data d, struct marker *m,
+ const void *p, int len);
struct data data_merge(struct data d1, struct data d2);
struct data data_append_cell(struct data d, cell_t word);
struct data data_append_re(struct data d, const struct fdt_reserve_entry *re);
Index: dtc/tests/Makefile.tests
===================================================================
--- dtc.orig/tests/Makefile.tests 2007-12-03 15:33:10.000000000 +1100
+++ dtc/tests/Makefile.tests 2007-12-05 10:31:51.000000000 +1100
@@ -9,7 +9,7 @@
sw_tree1 \
move_and_save mangle-layout \
open_pack rw_tree1 setprop del_property del_node \
- string_escapes references \
+ string_escapes references path-references \
dtbs_equal_ordered
LIB_TESTS = $(LIB_TESTS_L:%=$(TESTS_PREFIX)%)
Index: dtc/tests/path-references.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ dtc/tests/path-references.c 2007-12-05 10:31:51.000000000 +1100
@@ -0,0 +1,83 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Testcase for string references in dtc
+ * 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.
+ *
+ * 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.
+ *
+ * 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
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "tests.h"
+#include "testdata.h"
+
+void check_ref(const void *fdt, int node, const char *checkpath)
+{
+ const char *p;
+ int len;
+
+ p = fdt_getprop(fdt, node, "ref", &len);
+ if (!p)
+ FAIL("fdt_getprop(%d, \"ref\"): %s", node, fdt_strerror(len));
+ if (!streq(p, checkpath))
+ FAIL("'ref' in node at %d has value \"%s\" instead of \"%s\"",
+ node, p, checkpath);
+
+ p = fdt_getprop(fdt, node, "lref", &len);
+ if (!p)
+ FAIL("fdt_getprop(%d, \"lref\"): %s", node, fdt_strerror(len));
+ if (!streq(p, checkpath))
+ FAIL("'lref' in node at %d has value \"%s\" instead of \"%s\"",
+ node, p, checkpath);
+}
+
+int main(int argc, char *argv[])
+{
+ void *fdt;
+ const char *p;
+ int len, multilen;
+ int n1, n2;
+
+ test_init(argc, argv);
+ fdt = load_blob_arg(argc, argv);
+
+ n1 = fdt_path_offset(fdt, "/node1");
+ if (n1 < 0)
+ FAIL("fdt_path_offset(/node1): %s", fdt_strerror(n1));
+ n2 = fdt_path_offset(fdt, "/node2");
+ if (n2 < 0)
+ FAIL("fdt_path_offset(/node2): %s", fdt_strerror(n2));
+
+ check_ref(fdt, n1, "/node2");
+ check_ref(fdt, n2, "/node1");
+
+ /* Check multiple reference */
+ multilen = strlen("/node1") + strlen("/node2") + 2;
+ p = fdt_getprop(fdt, 0, "multiref", &len);
+ if (!p)
+ FAIL("fdt_getprop(0, \"multiref\"): %s", fdt_strerror(len));
+ if (len != multilen)
+ FAIL("multiref has wrong length, %d instead of %d",
+ len, multilen);
+ if ((!streq(p, "/node1") || !streq(p + strlen("/node1") + 1, "/node2")))
+ FAIL("multiref has wrong value");
+
+ PASS();
+}
Index: dtc/tests/path-references.dts
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ dtc/tests/path-references.dts 2007-12-05 10:35:55.000000000 +1100
@@ -0,0 +1,14 @@
+/dts-v1/;
+
+/ {
+ /* Check multiple references case */
+ multiref = &n1 , &n2;
+ n1: node1 {
+ ref = &{/node2}; /* reference precedes target */
+ lref = &n2;
+ };
+ n2: node2 {
+ ref = &{/node1}; /* reference after target */
+ lref = &n1;
+ };
+};
Index: dtc/data.c
===================================================================
--- dtc.orig/data.c 2007-12-05 09:02:20.000000000 +1100
+++ dtc/data.c 2007-12-05 10:34:01.000000000 +1100
@@ -202,6 +202,21 @@
return d;
}
+struct data data_insert_at_marker(struct data d, struct marker *m,
+ const void *p, int len)
+{
+ d = data_grow_for(d, len);
+ memmove(d.val + m->offset + len, d.val + m->offset, d.len - m->offset);
+ memcpy(d.val + m->offset, p, len);
+ d.len += len;
+
+ /* Adjust all markers after the one we're inserting at */
+ m = m->next;
+ for_each_marker(m)
+ m->offset += len;
+ return d;
+}
+
struct data data_append_markers(struct data d, struct marker *m)
{
struct marker **mp = &d.markers;
Index: dtc/checks.c
===================================================================
--- dtc.orig/checks.c 2007-12-05 09:48:12.000000000 +1100
+++ dtc/checks.c 2007-12-05 10:33:50.000000000 +1100
@@ -302,11 +302,36 @@
CHECK(phandle_references, NULL, NULL, fixup_phandle_references, NULL, ERROR,
&duplicate_node_names, &explicit_phandles);
+static void fixup_path_references(struct check *c, struct node *dt,
+ struct node *node, struct property *prop)
+{
+ struct marker *m = prop->val.markers;
+ struct node *refnode;
+ char *path;
+
+ for_each_marker_of_type(m, REF_PATH) {
+ assert(m->offset <= prop->val.len);
+
+ refnode = get_node_by_ref(dt, m->ref);
+ if (!refnode) {
+ FAIL(c, "Reference to non-existent node or label
\"%s\"\n",
+ m->ref);
+ continue;
+ }
+
+ path = refnode->fullpath;
+ prop->val = data_insert_at_marker(prop->val, m, path,
+ strlen(path) + 1);
+ }
+}
+CHECK(path_references, NULL, NULL, fixup_path_references, NULL, ERROR,
+ &duplicate_node_names);
+
static struct check *check_table[] = {
&duplicate_node_names, &duplicate_property_names,
&name_is_string, &name_properties,
&explicit_phandles,
- &phandle_references,
+ &phandle_references, &path_references,
};
int check_semantics(struct node *dt, int outversion, int boot_cpuid_phys);
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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