dm: Support driver model prior to relocation

Initialise devices marked 'pre-reloc' and make them available prior to
relocation. Note that this requires pre-reloc malloc() to be available.

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

2 files changed, 15 insertions, 1 deletions

diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h
index f6a2a2068a..edde9d7dd0 100644
--- a/include/asm-generic/global_data.h
+++ b/include/asm-generic/global_data.h
@@ -65,7 +65,8 @@ typedef struct global_data {
 	struct global_data *new_gd;	/* relocated global data */
 
 #ifdef CONFIG_DM
-	struct udevice	*dm_root;/* Root instance for Driver Model */
+	struct udevice	*dm_root;	/* Root instance for Driver Model */
+	struct udevice	*dm_root_f;	/* Pre-relocation root instance */
 	struct list_head uclass_root;	/* Head of core tree */
 #endif
 
diff --git a/include/dm/root.h b/include/dm/root.h
index d37b452eef..09f9303774 100644
--- a/include/dm/root.h
+++ b/include/dm/root.h
@@ -45,6 +45,19 @@ int dm_scan_platdata(bool pre_reloc_only);
 int dm_scan_fdt(const void *blob, bool pre_reloc_only);
 
 /**
+ * dm_init_and_scan() - Initialise Driver Model structures and scan for devices
+ *
+ * This function initialises the roots of the driver tree and uclass trees,
+ * then scans and binds available devices from platform data and the FDT.
+ * This calls dm_init() to set up Driver Model structures.
+ *
+ * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
+ * flag. If false bind all drivers.
+ * @return 0 if OK, -ve on error
+ */
+int dm_init_and_scan(bool pre_reloc_only);
+
+/**
  * dm_init() - Initialise Driver Model structures
  *
  * This function will initialize roots of driver tree and class tree.