Merge tag 'efi-2022-07-rc1-3' of https://source.denx.de/u-boot/custodians/u-boot-efi

Pull request for efi-2022-07-rc1-3

Documentation:

* Document image size parameter of bootefi command

UEFI:

* avoid building partition support in SPL/TPL where not required
* improve integration of EFI subsystem and driver model
* restore ability to boot arbitrary blob

1 files changed, 21 insertions, 0 deletions

diff --git a/doc/develop/driver-model/design.rst b/doc/develop/driver-model/design.rst
index b0e6337030a..5f33f9fbb32 100644
--- a/doc/develop/driver-model/design.rst
+++ b/doc/develop/driver-model/design.rst
@@ -1042,6 +1042,27 @@ data structure might be worthwhile in some rare cases, once we understand
 what the bottlenecks are.
 
 
+Tag Support
+-----------
+
+It is sometimes useful for a subsystem to associate its own private
+data (or object) to a DM device, i.e. struct udevice, to support
+additional features.
+
+Tag support in driver model will give us the ability to do so dynamically
+instead of modifying "udevice" data structure. In the initial release, we
+will support two type of attributes:
+
+- a pointer with dm_tag_set_ptr(), and
+- an unsigned long with dm_tag_set_val()
+
+For example, UEFI subsystem utilizes the feature to maintain efi_disk
+objects depending on linked udevice's lifecycle.
+
+While the current implementation is quite simple, it will get evolved
+as the feature is more extensively used in U-Boot subsystems.
+
+
 Changes since v1
 ----------------