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authorDavid Gibson <david@gibson.dropbear.id.au>2008-01-11 14:55:05 +1100
committerGerald Van Baren <vanbaren@cideas.com>2008-03-18 21:03:45 -0400
commit9eaeb07a7185d852c7aa10735ecd4e9edf24fb5d (patch)
treec805461c3e8e3e13372e918f0dd0ced4fa4571ea
parentfdeb932b1c8a3b615463995c3452d30ee0b12a33 (diff)
libfdt: Add fdt_set_name() function
This patch adds an fdt_set_name() function to libfdt, mirroring fdt_get_name(). This is a r/w function which alters the name of a given device tree node. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
-rw-r--r--include/libfdt.h26
-rw-r--r--libfdt/fdt_rw.c24
2 files changed, 50 insertions, 0 deletions
diff --git a/include/libfdt.h b/include/libfdt.h
index 6c052368581..f634a9c8df6 100644
--- a/include/libfdt.h
+++ b/include/libfdt.h
@@ -846,6 +846,32 @@ int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size);
int fdt_del_mem_rsv(void *fdt, int n);
/**
+ * fdt_set_name - change the name of a given node
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: structure block offset of a node
+ * @name: name to give the node
+ *
+ * fdt_set_name() replaces the name (including unit address, if any)
+ * of the given node with the given string. NOTE: this function can't
+ * efficiently check if the new name is unique amongst the given
+ * node's siblings; results are undefined if this function is invoked
+ * with a name equal to one of the given node's siblings.
+ *
+ * This function may insert or delete data from the blob, and will
+ * therefore change the offsets of some existing nodes.
+ *
+ * returns:
+ * 0, on success
+ * -FDT_ERR_NOSPACE, there is insufficient free space in the blob
+ * to contain the new name
+ * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ * -FDT_ERR_BADMAGIC,
+ * -FDT_ERR_BADVERSION,
+ * -FDT_ERR_BADSTATE, standard meanings
+ */
+int fdt_set_name(void *fdt, int nodeoffset, const char *name);
+
+/**
* fdt_setprop - create or change a property
* @fdt: pointer to the device tree blob
* @nodeoffset: offset of the node whose property to change
diff --git a/libfdt/fdt_rw.c b/libfdt/fdt_rw.c
index 6673f8ec962..a1c70ff154e 100644
--- a/libfdt/fdt_rw.c
+++ b/libfdt/fdt_rw.c
@@ -252,6 +252,30 @@ static int _add_property(void *fdt, int nodeoffset, const char *name, int len,
return 0;
}
+int fdt_set_name(void *fdt, int nodeoffset, const char *name)
+{
+ char *namep;
+ int oldlen, newlen;
+ int err;
+
+ if ((err = rw_check_header(fdt)))
+ return err;
+
+ namep = (char *)fdt_get_name(fdt, nodeoffset, &oldlen);
+ if (!namep)
+ return oldlen;
+
+ newlen = strlen(name);
+
+ err = _blob_splice_struct(fdt, namep, ALIGN(oldlen+1, FDT_TAGSIZE),
+ ALIGN(newlen+1, FDT_TAGSIZE));
+ if (err)
+ return err;
+
+ memcpy(namep, name, newlen+1);
+ return 0;
+}
+
int fdt_setprop(void *fdt, int nodeoffset, const char *name,
const void *val, int len)
{