dm: core: Set device tree node for root device

The root device corresponds to the root device tree node, so set this up. Also add a few notes to the documentation. Signed-off-by: Simon Glass <sjg@chromium.org>

dm: core: Set device tree node for root device
The root device corresponds to the root device tree node, so set this up. Also add a few notes to the documentation. Signed-off-by: Simon Glass <sjg@chromium.org>
Simon Glass
1 parent 040b69af72
Showing 2 changed files with 7 additions and 0 deletions Side-by-side Diff
doc/driver-model/README.txt
drivers/core/root.c
@@ -363,6 +363,10 @@
 in your ofdata_to_platdata (or probe) method to allocate the required memory,
 and you should free it in the remove method.
  
+The driver model tree is intended to mirror that of the device tree. The
+root driver is at device tree offset 0 (the root node, '/'), and its
+children are the children of the root node.
+
  
 Declaring Uclasses
 ------------------
@@ -49,6 +49,9 @@
 	ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST);
 	if (ret)
 		return ret;
+#ifdef CONFIG_OF_CONTROL
+	DM_ROOT_NON_CONST->of_offset = 0;
+#endif
 	ret = device_probe(DM_ROOT_NON_CONST);
 	if (ret)
 		return ret;
...	...	@@ -363,6 +363,10 @@
363	363	in your ofdata_to_platdata (or probe) method to allocate the required memory,
364	364	and you should free it in the remove method.
365	365
	366	+The driver model tree is intended to mirror that of the device tree. The
	367	+root driver is at device tree offset 0 (the root node, '/'), and its
	368	+children are the children of the root node.
	369	+
366	370
367	371	Declaring Uclasses
368	372	------------------
...	...	@@ -49,6 +49,9 @@
49	49	ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST);
50	50	if (ret)
51	51	return ret;
	52	+#ifdef CONFIG_OF_CONTROL
	53	+ DM_ROOT_NON_CONST->of_offset = 0;
	54	+#endif
52	55	ret = device_probe(DM_ROOT_NON_CONST);
53	56	if (ret)
54	57	return ret;