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fdt: Add a function to get the alias sequence of a node

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Aliases are used to provide U-Boot's numbering of devices, such as:

aliases {
	spi0 = "/spi@12330000";
}

spi@12330000 {
	...
}

This tells us that the SPI controller at 12330000 is considered to be the
first SPI controller (SPI 0). So we have a numbering for the SPI node.

Add a function that returns the numbering for a node assume that it exists
in the list of aliases.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2014-07-23 06:55:09 -06:00
parent 9ca296a1b0
commit 5c33c9fdbb
2 changed files with 64 additions and 0 deletions
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18
include/fdtdec.h
View File

@ -345,6 +345,24 @@ int fdtdec_find_aliases_for_id(const void *blob, const char *name,
int fdtdec_add_aliases_for_id(const void *blob, const char *name,
enum fdt_compat_id id, int *node_list, int maxcount);
/**
* Get the alias sequence number of a node
*
* This works out whether a node is pointed to by an alias, and if so, the
* sequence number of that alias. Aliases are of the form <base><num> where
* <num> is the sequence number. For example spi2 would be sequence number
* 2.
*
* @param blob Device tree blob (if NULL, then error is returned)
* @param base Base name for alias (before the underscore)
* @param node Node to look up
* @param seqp This is set to the sequence number if one is found,
* but otherwise the value is left alone
* @return 0 if a sequence was found, -ve if not
*/
int fdtdec_get_alias_seq(const void *blob, const char *base, int node,
int *seqp);
/*
* Get the name for a compatible ID
*

46
lib/fdtdec.c
View File

@ -5,9 +5,11 @@
#ifndef USE_HOSTCC
#include <common.h>
#include <errno.h>
#include <serial.h>
#include <libfdt.h>
#include <fdtdec.h>
#include <linux/ctype.h>
#include <asm/gpio.h>
@ -319,6 +321,50 @@ int fdtdec_add_aliases_for_id(const void *blob, const char *name,
return num_found;
}
int fdtdec_get_alias_seq(const void *blob, const char *base, int offset,
int *seqp)
{
int base_len = strlen(base);
const char *find_name;
int find_namelen;
int prop_offset;
int aliases;
find_name = fdt_get_name(blob, offset, &find_namelen);
debug("Looking for '%s' at %d, name %s\n", base, offset, find_name);
aliases = fdt_path_offset(blob, "/aliases");
for (prop_offset = fdt_first_property_offset(blob, aliases);
prop_offset > 0;
prop_offset = fdt_next_property_offset(blob, prop_offset)) {
const char *prop;
const char *name;
const char *slash;
const char *p;
int len;
prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len);
debug(" - %s, %s\n", name, prop);
if (len < find_namelen || *prop != '/' || prop[len - 1] ||
strncmp(name, base, base_len))
continue;
slash = strrchr(prop, '/');
if (strcmp(slash + 1, find_name))
continue;
for (p = name; *p; p++) {
if (isdigit(*p)) {
*seqp = simple_strtoul(p, NULL, 10);
debug("Found seq %d\n", *seqp);
return 0;
}
}
}
debug("Not found\n");
return -ENOENT;
}
int fdtdec_check_fdt(void)
{
/*