From: Frank Rowand <frank.rowand@xxxxxxxxxxxxxx>
Proof of concept patch.
Annotates input source file and line number of nodes and properties
as comments in output .dts file when --annotate flag is supplied.
A common dts source file convention is for a system .dts file
to include default SOC and/or device .dtsi files and then add
additional system specific properties or over-ride property values
from the .dtsi files. It can be a time consuming and error prone
exercise to determine exactly what nodes, properties, and property
values are in the final .dtb binary blob and where they originated.
Modify the dtc compiler to read a (possibly cpp pre-processed) .dts
file and for the output .dts annotate each node and property with
the corresponding source location.
As an example, one device tree node for the dragonboard in the
Linux kernel source tree is:
sdhci@f9824900 { /* arch/arm/boot/dts/qcom-apq8074-dragonboard.dts:14 */
compatible = "qcom,sdhci-msm-v4"; /* arch/arm/boot/dts/qcom-msm8974.dtsi:240 */
reg = <0xf9824900 0x11c 0xf9824000 0x800>; /* arch/arm/boot/dts/qcom-msm8974.dtsi:241 */
reg-names = "hc_mem", "core_mem"; /* arch/arm/boot/dts/qcom-msm8974.dtsi:242 */
interrupts = <0x0 0x7b 0x0 0x0 0x8a 0x0>; /* arch/arm/boot/dts/qcom-msm8974.dtsi:243 */
interrupt-names = "hc_irq", "pwr_irq"; /* arch/arm/boot/dts/qcom-msm8974.dtsi:244 */
clocks = <0xd 0xd8 0xd 0xd7>; /* arch/arm/boot/dts/qcom-msm8974.dtsi:245 */
clock-names = "core", "iface"; /* arch/arm/boot/dts/qcom-msm8974.dtsi:246 */
status = "ok"; /* arch/arm/boot/dts/qcom-apq8074-dragonboard.dts:17 */
bus-width = <0x8>; /* arch/arm/boot/dts/qcom-apq8074-dragonboard.dts:15 */
non-removable; /* arch/arm/boot/dts/qcom-apq8074-dragonboard.dts:16 */
}; /* arch/arm/boot/dts/qcom-apq8074-dragonboard.dts:18 */
qcom-apq8074-dragonboard.dts:
- last referenced the sdhci node
- changed the value of the "status" property from "disabled" to "ok"
- added two properties, "bus-width" and "non-removable"
qcom-msm8974.dtsi:
- initially set the value the "status" property to "disabled"
(not visible in the annotated .dts)
- provided all of the other property values
When the dtc compiler is run within the Linux kernel build system,
the path of the source files will be the full absolute path, just
as seen for gcc warnings and errors. I always trim away the path
leading up to the Linux kernel source tree by passing the kernel
build output through a sed pipe. I have done the same to the
above example to remove the excessive verbosity in the source paths.
Implementation notes:
- The source location of each node and property is saved in the
respective node or property during the parse phase because
the source location information from current_srcfile is no longer
available when the final values are written out from dt_to_source()
and the functions that it calls.
- A check is added to dtc.c to ensure that input and output format
are both device tree source. An alternate choice would be to
turn off the --annotate flag if either the input file or the
output file is not device tree source. In the alternate case,
the disabling of --annotate could be silent or a warning could
be issued.
Not-signed-off-by: Frank Rowand <frank.rowand@xxxxxxxxxxxxxx>
---
dtc-parser.y | 14 ++++++++++++--
dtc.c | 9 +++++++++
dtc.h | 12 +++++++++++-
flattree.c | 2 +-
fstree.c | 2 +-
livetree.c | 40 +++++++++++++++++++++++++++++++++++++++-
treesource.c | 27 ++++++++++++++++++++++-----
7 files changed, 95 insertions(+), 11 deletions(-)
Index: b/dtc.h
===================================================================
--- a/dtc.h
+++ b/dtc.h
@@ -54,6 +54,7 @@ extern int reservenum; /* Number of mem
extern int minsize; /* Minimum blob size */
extern int padsize; /* Additional padding to blob */
extern int phandle_format; /* Use linux,phandle or phandle properties */
+extern bool annotate; /* annotate .dts with input source location */
#define PHANDLE_LEGACY 0x1
#define PHANDLE_EPAPR 0x2
@@ -126,6 +127,11 @@ bool data_is_one_string(struct data d);
#define MAX_NODENAME_LEN 31
/* Live trees */
+struct src {
+ char *name;
+ int lineno;
+};
+
struct label {
bool deleted;
char *label;
@@ -140,6 +146,7 @@ struct property {
struct property *next;
struct label *labels;
+ struct src src;
};
struct node {
@@ -158,6 +165,8 @@ struct node {
int addr_cells, size_cells;
struct label *labels;
+ struct src begin_src;
+ struct src end_src;
};
#define for_each_label_withdel(l0, l) \
@@ -189,7 +198,8 @@ struct property *build_property_delete(c
struct property *chain_property(struct property *first, struct property *list);
struct property *reverse_properties(struct property *first);
-struct node *build_node(struct property *proplist, struct node *children);
+struct src *start_node(void);
+struct node *build_node(struct src *begin_src, struct property *proplist, struct node *children);
struct node *build_node_delete(void);
struct node *name_node(struct node *node, char *name);
struct node *chain_node(struct node *first, struct node *list);
Index: b/livetree.c
===================================================================
--- a/livetree.c
+++ b/livetree.c
@@ -19,6 +19,7 @@
*/
#include "dtc.h"
+#include "srcpos.h"
/*
* Tree building functions
@@ -58,6 +59,14 @@ struct property *build_property(char *na
new->name = name;
new->val = val;
+ if (current_srcfile) {
+ new->src.name = current_srcfile->name;
+ new->src.lineno = current_srcfile->lineno;
+ } else {
+ /* adding implicit property, such as phandle */
+ new->src.name = "__builtin__";
+ new->src.lineno = 0;
+ }
return new;
}
@@ -97,7 +106,22 @@ struct property *reverse_properties(stru
return head;
}
-struct node *build_node(struct property *proplist, struct node *children)
+struct src *start_node(void)
+{
+ struct src *new = xmalloc(sizeof(*new));
+
+ if (current_srcfile) {
+ new->name = current_srcfile->name;
+ new->lineno = current_srcfile->lineno;
+ } else {
+ new->name = "__builtin__";
+ new->lineno = 0;
+ }
+
+ return new;
+}
+
+struct node *build_node(struct src *begin_src, struct property *proplist, struct node *children)
{
struct node *new = xmalloc(sizeof(*new));
struct node *child;
@@ -111,6 +135,16 @@ struct node *build_node(struct property
child->parent = new;
}
+ if (begin_src) {
+ new->begin_src = *begin_src;
+ free(begin_src);
+ }
+
+ if (current_srcfile) {
+ new->end_src.name = current_srcfile->name;
+ new->end_src.lineno = current_srcfile->lineno;
+ }
+
return new;
}
@@ -169,6 +203,7 @@ struct node *merge_nodes(struct node *ol
old_prop->val = new_prop->val;
old_prop->deleted = 0;
+ old_prop->src = new_prop->src;
free(new_prop);
new_prop = NULL;
break;
@@ -209,6 +244,9 @@ struct node *merge_nodes(struct node *ol
add_child(old_node, new_child);
}
+ old_node->begin_src = new_node->begin_src;
+ old_node->end_src = new_node->end_src;
+
/* The new node contents are now merged into the old node. Free
* the new node. */
free(new_node);
Index: b/treesource.c
===================================================================
--- a/treesource.c
+++ b/treesource.c
@@ -202,7 +202,11 @@ static void write_propval(FILE *f, struc
int i;
if (len == 0) {
- fprintf(f, ";\n");
+ if (annotate)
+ fprintf(f, "; /* %s:%d */\n",
+ prop->src.name, prop->src.lineno);
+ else
+ fprintf(f, ";\n");
return;
}
@@ -230,7 +234,10 @@ static void write_propval(FILE *f, struc
write_propval_bytes(f, prop->val);
}
- fprintf(f, ";\n");
+ if (annotate)
+ fprintf(f, "; /* %s:%d */\n", prop->src.name, prop->src.lineno);
+ else
+ fprintf(f, ";\n");
}
static void write_tree_source_node(FILE *f, struct node *tree, int level)
@@ -242,10 +249,16 @@ static void write_tree_source_node(FILE
write_prefix(f, level);
for_each_label(tree->labels, l)
fprintf(f, "%s: ", l->label);
+
if (tree->name && (*tree->name))
- fprintf(f, "%s {\n", tree->name);
+ fprintf(f, "%s {", tree->name);
else
- fprintf(f, "/ {\n");
+ fprintf(f, "/ {");
+ if (annotate) {
+ fprintf(f, " /* %s:%d */\n",
+ tree->begin_src.name, tree->begin_src.lineno);
+ } else
+ fprintf(f, "\n");
for_each_property(tree, prop) {
write_prefix(f, level+1);
@@ -259,7 +272,11 @@ static void write_tree_source_node(FILE
write_tree_source_node(f, child, level+1);
}
write_prefix(f, level);
- fprintf(f, "};\n");
+ if (annotate)
+ fprintf(f, "}; /* %s:%d */\n",
+ tree->end_src.name, tree->end_src.lineno);
+ else
+ fprintf(f, "};\n");
}
Index: b/dtc.c
===================================================================
--- a/dtc.c
+++ b/dtc.c
@@ -29,6 +29,7 @@ int reservenum; /* Number of memory res
int minsize; /* Minimum blob size */
int padsize; /* Additional padding to blob */
int phandle_format = PHANDLE_BOTH; /* Use linux,phandle or phandle properties */
+bool annotate = false; /* annotate .dts with input source location */
static void fill_fullpaths(struct node *tree, const char *prefix)
{
@@ -71,6 +72,7 @@ static struct option const usage_long_op
{"error", a_argument, NULL, 'E'},
{"help", no_argument, NULL, 'h'},
{"version", no_argument, NULL, 'v'},
+ {"annotate", no_argument, NULL, 'a'},
{NULL, no_argument, NULL, 0x0},
};
static const char * const usage_opts_help[] = {
@@ -101,6 +103,7 @@ static const char * const usage_opts_hel
"\n\tEnable/disable errors (prefix with \"no-\")",
"\n\tPrint this help and exit",
"\n\tPrint version and exit",
+ "\n\tAnnotate output .dts with input source file and line",
NULL,
};
@@ -125,6 +128,9 @@ int main(int argc, char *argv[])
while ((opt = util_getopt_long()) != EOF) {
switch (opt) {
+ case 'a':
+ annotate = true;
+ break;
case 'I':
inform = optarg;
break;
@@ -213,6 +219,9 @@ int main(int argc, char *argv[])
fprintf(depfile, "%s:", outname);
}
+ if (annotate && (!streq(inform, "dts") || !streq(outform, "dts")))
+ die("--annotate requires -I dts -O dts\n");
+
if (streq(inform, "dts"))
bi = dt_from_source(arg);
else if (streq(inform, "fs"))
Index: b/dtc-parser.y
===================================================================
--- a/dtc-parser.y
+++ b/dtc-parser.y
@@ -48,6 +48,7 @@ extern bool treesource_error;
struct property *prop;
struct property *proplist;
+ struct src *src;
struct node *node;
struct node *nodelist;
struct reserve_info *re;
@@ -78,6 +79,7 @@ extern bool treesource_error;
%type <prop> propdef
%type <proplist> proplist
+%type <src> openbrace
%type <node> devicetree
%type <node> nodedef
%type <node> subnode
@@ -177,12 +179,20 @@ devicetree:
;
nodedef:
- '{' proplist subnodes '}' ';'
+ openbrace proplist subnodes '}' ';'
{
- $$ = build_node($2, $3);
+ $$ = build_node($1, $2, $3);
}
;
+openbrace:
+ '{'
+ {
+ $$ = start_node();
+ }
+ ;
+
+
proplist:
/* empty */
{
Index: b/flattree.c
===================================================================
--- a/flattree.c
+++ b/flattree.c
@@ -748,7 +748,7 @@ static struct node *unflatten_tree(struc
char *flatname;
uint32_t val;
- node = build_node(NULL, NULL);
+ node = build_node(NULL, NULL, NULL);
flatname = flat_read_string(dtbuf);
Index: b/fstree.c
===================================================================
--- a/fstree.c
+++ b/fstree.c
@@ -34,7 +34,7 @@ static struct node *read_fstree(const ch
if (!d)
die("Couldn't opendir() \"%s\": %s\n", dirname, strerror(errno));
- tree = build_node(NULL, NULL);
+ tree = build_node(NULL, NULL, NULL);
while ((de = readdir(d)) != NULL) {
char *tmpname;
--
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