Hi Pantelis,
Thank you for working on this again. I would really appreciate seeing
this upstream.
On Mon, Nov 04, 2013 at 04:36:13PM +0200, Pantelis Antoniou wrote:
> +Notice that all the nodes that had a label have been recorded, and that
> +phandles have been generated for them.
> +
> +This blob can be used to boot the board normally, the __symbols__ node will
> +be safely ignored both by the bootloader and the kernel (the only loss will
> +be a few bytes of memory and disk space).
> +
> +3.b) The Device Tree fragments must be compiled with the same option but they
> +must also have a tag (/plugin/) that allows undefined references to labels
> +that are not present at compilation time to be recorded so that the runtime
> +loader can fix them.
> +
> +So the bar peripheral's DTS format would be of the form:
> +
> +/plugin/; /* allow undefined label references and record them */
> +/ {
> + .... /* various properties for loader use; i.e. part id etc. */
> + fragment@0 {
> + target = <&ocp>;
> + __overlay__ {
> + /* bar peripheral */
> + bar {
> + compatible = "corp,bar";
> + ... /* various properties and child nodes */
> + }
> + };
> + };
> +};
When last looking at this patch I created the attached follow up. What
I didn't like about this patch is that we currently have to write dts
files explicitely as overlays. With the attached patch the above could
be written as:
&ocp: {
compatible = "corp,bar";
};
This is easier to write and more important a dts snippet could be either
compiled into a dtb or used as an overlay.
Sascha
8<-------------------------------------------------------------------
>From bf78934e2bfe5c220d97d52e4effdd95164e071f Mon Sep 17 00:00:00 2001
From: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Date: Thu, 8 Aug 2013 23:08:31 +0200
Subject: [PATCH] dtc: convert unresolved labels into overlay nodes
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
dtc-parser.y | 10 +++++++---
dtc.h | 3 ++-
livetree.c | 23 +++++++++++++++++++++++
3 files changed, 32 insertions(+), 4 deletions(-)
diff --git a/dtc-parser.y b/dtc-parser.y
index e444acf..db1e9f8 100644
--- a/dtc-parser.y
+++ b/dtc-parser.y
@@ -166,10 +166,14 @@ devicetree:
{
struct node *target = get_node_by_ref($1, $2);
- if (target)
+ if (target) {
merge_nodes(target, $3);
- else
- print_error("label or path, '%s', not found", $2);
+ } else {
+ if (symbol_fixup_support)
+ add_orphan_node($1, $3, $2);
+ else
+ print_error("label or path, '%s', not found", $2);
+ }
$$ = $1;
}
| devicetree DT_DEL_NODE DT_REF ';'
diff --git a/dtc.h b/dtc.h
index 8c9059b..147ab35 100644
--- a/dtc.h
+++ b/dtc.h
@@ -20,7 +20,7 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
-
+#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
@@ -232,6 +232,7 @@ 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);
struct node *merge_nodes(struct node *old_node, struct node *new_node);
+void add_orphan_node(struct node *old_node, struct node *new_node, char *ref);
void add_property(struct node *node, struct property *prop);
void delete_property_by_name(struct node *node, char *name);
diff --git a/livetree.c b/livetree.c
index b61465f..cc26fe1 100644
--- a/livetree.c
+++ b/livetree.c
@@ -216,6 +216,29 @@ struct node *merge_nodes(struct node *old_node, struct node *new_node)
return old_node;
}
+void add_orphan_node(struct node *dt, struct node *new_node, char *ref)
+{
+ struct node *ovl = xmalloc(sizeof(*ovl));
+ struct property *p;
+ struct data d = empty_data;
+ char *name;
+
+ memset(ovl, 0, sizeof(*ovl));
+
+ d = data_add_marker(d, REF_PHANDLE, ref);
+ d = data_append_integer(d, 0xdeadbeef, 32);
+
+ p = build_property("target", d);
+ add_property(ovl, p);
+
+ asprintf(&name, "fragment@%s", ref);
+ name_node(ovl, name);
+ name_node(new_node, "__overlay__");
+
+ add_child(dt, ovl);
+ add_child(ovl, new_node);
+}
+
struct node *chain_node(struct node *first, struct node *list)
{
assert(first->next_sibling == NULL);
--
1.8.4.rc3
--
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