dm: Provide a function to scan child FDT nodes

At present only root nodes in the device tree are scanned for devices.
But some devices can have children. For example a SPI bus may have
several children for each of its chip selects.

Add a function which scans subnodes and binds devices for each one. This
can be used for the root node scan also, so change it.

A device can call this function in its bind() or probe() methods to bind
its children.

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

include/dm/root.h

@@ -45,6 +45,22 @@ int dm_scan_platdata(bool pre_reloc_only);
  */
 int dm_scan_fdt(const void *blob, bool pre_reloc_only);
 
+/**
+ * dm_scan_fdt_node() - Scan the device tree and bind drivers for a node
+ *
+ * This scans the subnodes of a device tree node and and creates a driver
+ * for each one.
+ *
+ * @parent: Parent device for the devices that will be created
+ * @blob: Pointer to device tree blob
+ * @offset: Offset of node to scan
+ * @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_scan_fdt_node(struct udevice *parent, const void *blob, int offset,
+		     bool pre_reloc_only);
+
 /**
  * dm_init_and_scan() - Initialise Driver Model structures and scan for devices
  *

include/dm/test.h

@@ -155,6 +155,15 @@ int testfdt_ping(struct udevice *dev, int pingval, int *pingret);
 int dm_check_operations(struct dm_test_state *dms, struct udevice *dev,
 			uint32_t base, struct dm_test_priv *priv);
 
+/**
+ * dm_check_devices() - check the devices respond to operations correctly
+ *
+ * @dms: Overall test state
+ * @num_devices: Number of test devices to check
+ * @return 0 if OK, -ve on error
+ */
+int dm_check_devices(struct dm_test_state *dms, int num_devices);
+
 /**
  * dm_test_main() - Run all the tests
  *

include/dm/uclass-id.h

@@ -17,6 +17,7 @@ enum uclass_id {
 	UCLASS_DEMO,
 	UCLASS_TEST,
 	UCLASS_TEST_FDT,
+	UCLASS_TEST_BUS,
 
 	/* U-Boot uclasses start here */
 	UCLASS_GPIO,		/* Bank of general-purpose I/O pins */