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fdtget: Add -l to list the subnodes of a node 

This option lists the subnodes of each node given as a parameter, one
subnode per line.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Simon Glass 2012-03-06 16:41:46 -08:00 committed by Jon Loeliger
parent 30eb201ada
commit 16c99ee8e3
1 changed files with 84 additions and 12 deletions
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96
fdtget.c
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@ -37,6 +37,7 @@
enum display_mode {
MODE_SHOW_VALUE, /* show values for node properties */
MODE_LIST_PROPS, /* list the properties for a node */
MODE_LIST_SUBNODES, /* list the subnodes of a node */
};
/* Holds information which controls our output and options */
@ -136,6 +137,61 @@ static int list_properties(const void *blob, int node)
} while (1);
}
#define MAX_LEVEL 32 /* how deeply nested we will go */
/**
* List all subnodes in a node, one per line
*
* @param blob FDT blob
* @param node Node to display
* @return 0 if ok, or FDT_ERR... if not.
*/
static int list_subnodes(const void *blob, int node)
{
int nextoffset; /* next node offset from libfdt */
uint32_t tag; /* current tag */
int level = 0; /* keep track of nesting level */
const char *pathp;
int depth = 1; /* the assumed depth of this node */
while (level >= 0) {
tag = fdt_next_tag(blob, node, &nextoffset);
switch (tag) {
case FDT_BEGIN_NODE:
pathp = fdt_get_name(blob, node, NULL);
if (level <= depth) {
if (pathp == NULL)
pathp = "/* NULL pointer error */";
if (*pathp == '\0')
pathp = "/"; /* root is nameless */
if (level == 1)
puts(pathp);
}
level++;
if (level >= MAX_LEVEL) {
printf("Nested too deep, aborting.\n");
return 1;
}
break;
case FDT_END_NODE:
level--;
if (level == 0)
level = -1; /* exit the loop */
break;
case FDT_END:
return 1;
case FDT_PROP:
break;
default:
if (level <= depth)
printf("Unknown tag 0x%08X\n", tag);
return 1;
}
node = nextoffset;
}
return 0;
}
/**
* Show the data for a given node (and perhaps property) according to the
* display option provided.
@ -152,20 +208,30 @@ static int show_data_for_item(const void *blob, struct display_info *disp,
const void *value = NULL;
int len, err = 0;
if (disp->mode == MODE_LIST_PROPS)
return list_properties(blob, node);
switch (disp->mode) {
case MODE_LIST_PROPS:
err = list_properties(blob, node);
break;
assert(property);
value = fdt_getprop(blob, node, property, &len);
if (value) {
if (show_data(disp, value, len))
case MODE_LIST_SUBNODES:
err = list_subnodes(blob, node);
break;
default:
assert(property);
value = fdt_getprop(blob, node, property, &len);
if (value) {
if (show_data(disp, value, len))
err = -1;
else
printf("\n");
} else {
report_error(property, len);
err = -1;
else
printf("\n");
} else {
report_error(property, len);
err = -1;
}
break;
}
return err;
}
@ -213,6 +279,7 @@ static const char *usage_msg =
"Options:\n"
"\t-t <type>\tType of data\n"
"\t-p\t\tList properties for each node\n"
"\t-l\t\tList subnodes for each node\n"
"\t-h\t\tPrint this help\n\n"
USAGE_TYPE_MSG;
@ -236,7 +303,7 @@ int main(int argc, char *argv[])
disp.size = -1;
disp.mode = MODE_SHOW_VALUE;
for (;;) {
int c = getopt(argc, argv, "hpt:");
int c = getopt(argc, argv, "hlpt:");
if (c == -1)
break;
@ -255,6 +322,11 @@ int main(int argc, char *argv[])
disp.mode = MODE_LIST_PROPS;
args_per_step = 1;
break;
case 'l':
disp.mode = MODE_LIST_SUBNODES;
args_per_step = 1;
break;
}
}