[U-Boot] [RFC PATCH v2 09/13] dm: Cast away the const-ness of the global_data pointer

[Simon Glass]

In a very few cases we need to adjust the driver model root device, such as
when setting it up at initialisation. Add a macro to make this easier.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v3:
- Fix typo in commit subject

Changes in v2:
- Add new patch to deal with const-ness of the global_data pointer

 drivers/core/root.c          | 6 +++---
 drivers/core/uclass.c        | 2 +-
 include/dm/device-internal.h | 4 ++++
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/core/root.c b/drivers/core/root.c
index 88d2f45..4427b81 100644
--- a/drivers/core/root.c
+++ b/drivers/core/root.c
@@ -43,9 +43,9 @@ int dm_init(void)
 		dm_warn("Virtual root driver already exists!\n");
 		return -EINVAL;
 	}
-	INIT_LIST_HEAD(&gd->uclass_root);
+	INIT_LIST_HEAD(&DM_UCLASS_ROOT());
 
-	ret = device_bind_by_name(NULL, &root_info, &gd->dm_root);
+	ret = device_bind_by_name(NULL, &root_info, &DM_ROOT());
 	if (ret)
 		return ret;
 
@@ -56,7 +56,7 @@ int dm_scan_platdata(void)
 {
 	int ret;
 
-	ret = lists_bind_drivers(gd->dm_root);
+	ret = lists_bind_drivers(DM_ROOT());
 	if (ret == -ENOENT) {
 		dm_warn("Some drivers were not found\n");
 		ret = 0;
diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c
index 4df5a8b..afb5fdc 100644
--- a/drivers/core/uclass.c
+++ b/drivers/core/uclass.c
@@ -75,7 +75,7 @@ static int uclass_add(enum uclass_id id, struct uclass **ucp)
 	uc->uc_drv = uc_drv;
 	INIT_LIST_HEAD(&uc->sibling_node);
 	INIT_LIST_HEAD(&uc->dev_head);
-	list_add(&uc->sibling_node, &gd->uclass_root);
+	list_add(&uc->sibling_node, &DM_UCLASS_ROOT());
 
 	if (uc_drv->init) {
 		ret = uc_drv->init(uc);
diff --git a/include/dm/device-internal.h b/include/dm/device-internal.h
index c026e8e..e95b7a9 100644
--- a/include/dm/device-internal.h
+++ b/include/dm/device-internal.h
@@ -84,4 +84,8 @@ int device_remove(struct device *dev);
  */
 int device_unbind(struct device *dev);
 
+/* Cast away any volatile pointer */
+#define DM_ROOT()		(((gd_t *)gd)->dm_root)
+#define DM_UCLASS_ROOT()		(((gd_t *)gd)->uclass_root)
+
 #endif
-- 
1.9.1.423.g4596e3a