diff mbox series

[v3,09/19] dm: tag: add some document

Message ID 20220308113657.221101-10-takahiro.akashi@linaro.org
State Superseded
Headers show
Series efi_loader: more tightly integrate UEFI disks to driver model | expand

Commit Message

AKASHI Takahiro March 8, 2022, 11:36 a.m. UTC 
Some basic stuff about tag support is explained under
doc/devlop/driver-model.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
---
 doc/develop/driver-model/design.rst | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
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Patch

diff --git a/doc/develop/driver-model/design.rst b/doc/develop/driver-model/design.rst
index b0e6337030a1..3e88dc40e6fd 100644
--- a/doc/develop/driver-model/design.rst
+++ b/doc/develop/driver-model/design.rst
@@ -1042,6 +1042,26 @@  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
 ----------------