[PATCH v4 07/42] dm: core: Set up driver model for OF_PLATDATA_INST

[Simon Glass]

With this we don't need to scan and bind drivers, not even the root
device. We just need to locate the root device that was set up at build
time, then set our root in global_data to point to it.

Update the code to handle this case.

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

(no changes since v1)

 drivers/core/root.c | 42 ++++++++++++++++++++++++++++++------------
 1 file changed, 30 insertions(+), 12 deletions(-)

diff --git a/drivers/core/root.c b/drivers/core/root.c
index 3feadb77b56..3e52452cd85 100644
--- a/drivers/core/root.c
+++ b/drivers/core/root.c
@@ -129,6 +129,13 @@ void fix_devices(void)
 	}
 }
 
+static int dm_setup_inst(void)
+{
+	DM_ROOT_NON_CONST = DM_DEVICE_GET(root);
+
+	return 0;
+}
+
 int dm_init(bool of_live)
 {
 	int ret;
@@ -153,14 +160,23 @@ int dm_init(bool of_live)
 		fix_devices();
 	}
 
-	ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST);
-	if (ret)
-		return ret;
-	if (CONFIG_IS_ENABLED(OF_CONTROL))
-		dev_set_ofnode(DM_ROOT_NON_CONST, ofnode_root());
-	ret = device_probe(DM_ROOT_NON_CONST);
-	if (ret)
-		return ret;
+	if (CONFIG_IS_ENABLED(OF_PLATDATA_INST)) {
+		ret = dm_setup_inst();
+		if (ret) {
+			log_debug("dm_setup_inst() failed: %d\n", ret);
+			return ret;
+		}
+	} else {
+		ret = device_bind_by_name(NULL, false, &root_info,
+					  &DM_ROOT_NON_CONST);
+		if (ret)
+			return ret;
+		if (CONFIG_IS_ENABLED(OF_CONTROL))
+			dev_set_ofnode(DM_ROOT_NON_CONST, ofnode_root());
+		ret = device_probe(DM_ROOT_NON_CONST);
+		if (ret)
+			return ret;
+	}
 
 	return 0;
 }
@@ -351,10 +367,12 @@ int dm_init_and_scan(bool pre_reloc_only)
 		debug("dm_init() failed: %d\n", ret);
 		return ret;
 	}
-	ret = dm_scan(pre_reloc_only);
-	if (ret) {
-		log_debug("dm_scan() failed: %d\n", ret);
-		return ret;
+	if (!CONFIG_IS_ENABLED(OF_PLATDATA_INST)) {
+		ret = dm_scan(pre_reloc_only);
+		if (ret) {
+			log_debug("dm_scan() failed: %d\n", ret);
+			return ret;
+		}
 	}
 
 	return 0;
-- 
2.31.0.rc2.261.g7f71774620-goog