From: Tom Rini <trini@konsulko.com>
Date: Thu, 10 Mar 2022 13:28:40 +0000 (-0500)
Subject: Merge branch '2022-03-09-events-subsystem' into next
X-Git-Tag: v2022.07~124^2~19
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=cb83a7a0c360d58a3a9bf2ba3828e576eafecb91;hp=abe5d1184f276a0789365316061a14834dbc8dc4;p=platform%2Fkernel%2Fu-boot.git

Merge branch '2022-03-09-events-subsystem' into next

To quote the author:
It is a common need in U-Boot to have one subsystem notify another
when something happens. An example is reading a partition table when a
new block device is set up.

It is also common to add weak functions and 'hook' functions to modify
how U-Boot works. See for example ft_board_setup() and the like.

U-Boot would benefit from a generic mechanism to handle these cases,
with the ability to hook into various 'events' in a
subsystem-independent and transparent way.

This series provides a way to create and dispatch events, with a way of
registering a 'spy' which watches for events of different types. This
allows 'hook' functions to be created in a generic way.

It also includes a script to list the hooks in an image, which is a bit
easier to debug than weak functions, as well as an 'event' command to
do the same from within U-Boot.

These 'static' events can be used to replace hooks like misc_init_f(),
for example. Also included is basic support for 'dynamic' events, where
a spy can be registered at runtime. The need for this is still being
figured out.
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