[PATCH] commands/of_node: add option to apply changes as fixup

["Baeuerle, Florian" <Florian.Baeuerle@allegion.com>]

Analogous to the of_property command, add an -f option to the of_node
command. This option defers the device tree modification until boot
time and thus applies the modification as a fixup on the linux device
tree.

Signed-off-by: Florian Bäuerle <florian.baeuerle@allegion.com>
---
 commands/of_node.c | 106 ++++++++++++++++++++++++++++++++-------------
 1 file changed, 75 insertions(+), 31 deletions(-)

diff --git a/commands/of_node.c b/commands/of_node.c
index 4962e5242..29cc371dd 100644
--- a/commands/of_node.c
+++ b/commands/of_node.c
@@ -32,16 +32,66 @@
 #include <init.h>
 #include <libgen.h>
 
+static int do_of_node_create_now(struct device_node *root, const char *path);
+static int do_of_node_delete_now(struct device_node *root, const char *path);
+
+static int of_fixup_node_create(struct device_node *root, void *context)
+{
+	return do_of_node_create_now(root, (const char *)context);
+}
+
+static int of_fixup_node_delete(struct device_node *root, void *context)
+{
+	return do_of_node_delete_now(root, (const char *)context);
+}
+
+static int do_of_node_create_fixup(const char *path)
+{
+	char *data = xstrdup(path);
+
+	return of_register_fixup(of_fixup_node_create, (void *)data);
+}
+
+static int do_of_node_delete_fixup(const char *path)
+{
+	char *data = xstrdup(path);
+
+	return of_register_fixup(of_fixup_node_delete, (void *)data);
+}
+
+static int do_of_node_create_now(struct device_node *root, const char *path)
+{
+	struct device_node *node = of_create_node(root, path);
+
+	if (!node)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int do_of_node_delete_now(struct device_node *root, const char *path)
+{
+	struct device_node *node = of_find_node_by_path(path);
+
+	if (!node) {
+		printf("Cannot find nodepath %s\n", path);
+		return -ENOENT;
+	}
+
+	of_delete_node(node);
+
+	return 0;
+}
+
 static int do_of_node(int argc, char *argv[])
 {
 	int opt;
 	int delete = 0;
 	int create = 0;
+	int fixup = 0;
 	char *path = NULL;
-	struct device_node *node = NULL;
-	struct device_node *root;
 
-	while ((opt = getopt(argc, argv, "cd")) > 0) {
+	while ((opt = getopt(argc, argv, "cdf")) > 0) {
 		switch (opt) {
 		case 'c':
 			create = 1;
@@ -49,6 +99,9 @@ static int do_of_node(int argc, char *argv[])
 		case 'd':
 			delete = 1;
 			break;
+		case 'f':
+			fixup = 1;
+			break;
 		default:
 			return COMMAND_ERROR_USAGE;
 		}
@@ -57,53 +110,44 @@ static int do_of_node(int argc, char *argv[])
 	if (optind == argc)
 		return COMMAND_ERROR_USAGE;
 
-	if (optind < argc) {
+	if (optind < argc)
 		path = argv[optind];
-	}
 
-	root = of_get_root_node();
-	if (!root) {
-		printf("root node not set\n");
-		return -ENOENT;
-	}
-
-	if (create) {
-		if (!path)
-			return COMMAND_ERROR_USAGE;
-
-		node = of_create_node(root, path);
-		if (!node)
-			return -EINVAL;
-
-		return 0;
-	}
-
-	if (delete) {
-		if (!path)
-			return COMMAND_ERROR_USAGE;
+	if (!path)
+		return COMMAND_ERROR_USAGE;
 
-		node = of_find_node_by_path(path);
-		if (!node) {
-			printf("Cannot find nodepath %s\n", path);
+	if (fixup) {
+		if (create)
+			return do_of_node_create_fixup(path);
+		if (delete)
+			return do_of_node_delete_fixup(path);
+	} else {
+		struct device_node *root = of_get_root_node();
+		if (!root) {
+			printf("root node not set\n");
 			return -ENOENT;
 		}
 
-		of_delete_node(node);
+		if (create)
+			return do_of_node_create_now(root, path);
+		if (delete)
+			return do_of_node_delete_now(root, path);
 	}
 
-	return 0;
+	return COMMAND_ERROR_USAGE;
 }
 
 BAREBOX_CMD_HELP_START(of_node)
 BAREBOX_CMD_HELP_TEXT("Options:")
 BAREBOX_CMD_HELP_OPT ("-c",  "create a new node")
 BAREBOX_CMD_HELP_OPT ("-d",  "delete a node")
+BAREBOX_CMD_HELP_OPT ("-f",  "create/delete as a fixup (defer the action until booting)")
 BAREBOX_CMD_HELP_END
 
 BAREBOX_CMD_START(of_node)
 	.cmd		= do_of_node,
 	BAREBOX_CMD_DESC("create/delete nodes in the device tree")
-	BAREBOX_CMD_OPTS("[-cd] NODE NAME")
+	BAREBOX_CMD_OPTS("[-cd] [-f] NODE NAME")
 	BAREBOX_CMD_GROUP(CMD_GRP_MISC)
 	BAREBOX_CMD_COMPLETE(devicetree_complete)
 	BAREBOX_CMD_HELP(cmd_of_node_help)
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