dm: Tidy up some header file comments

Fix up the style of a few comments and add/clarify a few others.

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

include/dm/device.h

@@ -124,7 +124,7 @@ struct udevice_id {
  * This is typically only useful for device-tree-aware drivers (those with
  * an of_match), since drivers which use platdata will have the data
  * provided in the U_BOOT_DEVICE() instantiation.
- * ops: Driver-specific operations. This is typically a list of function
+ * @ops: Driver-specific operations. This is typically a list of function
  * pointers defined by the driver, to implement driver functions required by
  * the uclass.
  * @flags: driver flags - see DM_FLAGS_...

include/dm/platdata.h

@@ -11,6 +11,12 @@
 #ifndef _DM_PLATDATA_H
 #define _DM_PLATDATA_H
 
+/**
+ * struct driver_info - Information required to instantiate a device
+ *
+ * @name:	Device name
+ * @platdata:	Driver-specific platform data
+ */
 struct driver_info {
 	const char *name;
 	const void *platdata;

include/dm/root.h

@@ -35,7 +35,8 @@ int dm_scan_platdata(bool pre_reloc_only);
 /**
  * dm_scan_fdt() - Scan the device tree and bind drivers
  *
- * This scans the device tree and creates a driver for each node
+ * This scans the device tree and creates a driver for each node. Only
+ * the top-level subnodes are examined.
  *
  * @blob: Pointer to device tree blob
  * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC

include/dm/uclass-id.h

@@ -19,7 +19,7 @@ enum uclass_id {
 	UCLASS_TEST_FDT,
 
 	/* U-Boot uclasses start here */
-	UCLASS_GPIO,
+	UCLASS_GPIO,		/* Bank of general-purpose I/O pins */
 
 	UCLASS_COUNT,
 	UCLASS_INVALID = -1,

include/dm/uclass.h

@@ -98,7 +98,7 @@ int uclass_get(enum uclass_id key, struct uclass **ucp);
  *
  * The device is probed to activate it ready for use.
  *
- * id: ID to look up
+ * @id: ID to look up
  * @index: Device number within that uclass (0=first)
  * @devp: Returns pointer to device (there is only one per for each ID)
  * @return 0 if OK, -ve on error