dm: core: Scan the live tree when setting up driver model

When starting up driver model with a live tree we need to scan the tree
for devices. Add code to handle this.

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

drivers/core/root.c

@@ -15,7 +15,10 @@
 #include <dm/device.h>
 #include <dm/device-internal.h>
 #include <dm/lists.h>
+#include <dm/of.h>
+#include <dm/of_access.h>
 #include <dm/platdata.h>
+#include <dm/read.h>
 #include <dm/root.h>
 #include <dm/uclass.h>
 #include <dm/util.h>
@@ -147,7 +150,7 @@ void fix_devices(void)
 
 #endif
 
-int dm_init(void)
+int dm_init(bool of_live)
 {
 	int ret;
 
@@ -167,7 +170,12 @@ int dm_init(void)
 	if (ret)
 		return ret;
 #if CONFIG_IS_ENABLED(OF_CONTROL)
-	DM_ROOT_NON_CONST->node = offset_to_ofnode(0);
+# if CONFIG_IS_ENABLED(OF_LIVE)
+	if (of_live)
+		DM_ROOT_NON_CONST->node = np_to_ofnode(gd->of_root);
+	else
+#endif
+		DM_ROOT_NON_CONST->node = offset_to_ofnode(0);
 #endif
 	ret = device_probe(DM_ROOT_NON_CONST);
 	if (ret)
@@ -206,6 +214,36 @@ int dm_scan_platdata(bool pre_reloc_only)
 	return ret;
 }
 
+#if CONFIG_IS_ENABLED(OF_LIVE)
+static int dm_scan_fdt_live(struct udevice *parent,
+			    const struct device_node *node_parent,
+			    bool pre_reloc_only)
+{
+	struct device_node *np;
+	int ret = 0, err;
+
+	for (np = node_parent->child; np; np = np->sibling) {
+		if (pre_reloc_only &&
+		    !of_find_property(np, "u-boot,dm-pre-reloc", NULL))
+			continue;
+		if (!of_device_is_available(np)) {
+			dm_dbg("   - ignoring disabled device\n");
+			continue;
+		}
+		err = lists_bind_fdt(parent, np_to_ofnode(np), NULL);
+		if (err && !ret) {
+			ret = err;
+			debug("%s: ret=%d\n", np->name, ret);
+		}
+	}
+
+	if (ret)
+		dm_warn("Some drivers failed to bind\n");
+
+	return ret;
+}
+#endif /* CONFIG_IS_ENABLED(OF_LIVE) */
+
 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
 /**
  * dm_scan_fdt_node() - Scan the device tree and bind drivers for a node
@@ -251,15 +289,27 @@ static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
 
 int dm_scan_fdt_dev(struct udevice *dev)
 {
-	if (dev_of_offset(dev) == -1)
+	if (!dev_of_valid(dev))
 		return 0;
 
+#if CONFIG_IS_ENABLED(OF_LIVE)
+	if (of_live_active())
+		return dm_scan_fdt_live(dev, dev_np(dev),
+				gd->flags & GD_FLG_RELOC ? false : true);
+	else
+#endif
 	return dm_scan_fdt_node(dev, gd->fdt_blob, dev_of_offset(dev),
 				gd->flags & GD_FLG_RELOC ? false : true);
 }
 
 int dm_scan_fdt(const void *blob, bool pre_reloc_only)
 {
+#if CONFIG_IS_ENABLED(OF_LIVE)
+	if (of_live_active())
+		return dm_scan_fdt_live(gd->dm_root, gd->of_root,
+					pre_reloc_only);
+	else
+#endif
 	return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only);
 }
 #endif
@@ -273,7 +323,7 @@ int dm_init_and_scan(bool pre_reloc_only)
 {
 	int ret;
 
-	ret = dm_init();
+	ret = dm_init(IS_ENABLED(CONFIG_OF_LIVE));
 	if (ret) {
 		debug("dm_init() failed: %d\n", ret);
 		return ret;

include/dm/root.h

@@ -87,9 +87,10 @@ int dm_init_and_scan(bool pre_reloc_only);
  * This function will initialize roots of driver tree and class tree.
  * This needs to be called before anything uses the DM
  *
+ * @of_live:	Enable live device tree
  * @return 0 if OK, -ve on error
  */
-int dm_init(void);
+int dm_init(bool of_live);
 
 /**
  * dm_uninit - Uninitialise Driver Model structures

test/dm/test-main.c

@@ -30,7 +30,7 @@ static int dm_test_init(struct unit_test_state *uts)
 	gd->dm_root = NULL;
 	memset(dm_testdrv_op_count, '\0', sizeof(dm_testdrv_op_count));
 
-	ut_assertok(dm_init());
+	ut_assertok(dm_init(false));
 	dms->root = dm_root();
 
 	return 0;
@@ -137,7 +137,7 @@ static int dm_test_main(const char *test_name)
 		printf("Failures: %d\n", uts->fail_count);
 
 	gd->dm_root = NULL;
-	ut_assertok(dm_init());
+	ut_assertok(dm_init(false));
 	dm_scan_platdata(false);
 	dm_scan_fdt(gd->fdt_blob, false);