Aliases are used to provide U-Boot's numbering of devices, such as:
aliases {
spi0 = /spi@1233;
}
spi@1233 {
...
}
This tells us that the SPI controller at 1233 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 s...@chromium.org
---
Changes in v3: None
Changes in v2: None
include/fdtdec.h | 18 ++
lib/fdtdec.c | 46 ++
2 files changed, 64 insertions(+)
diff --git a/include/fdtdec.h b/include/fdtdec.h
index d4284bb..f96b0d3 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -347,6 +347,24 @@ 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 basenum 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
*
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 17d7969..3f3ed4e 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -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
@@ -321,6 +323,50 @@ 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)
{
/*
--
2.0.0.526.g5318336
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