From: Stephen Warren <swarren@wwwdotorg.org>
To: u-boot@lists.denx.de
Subject: [U-Boot] reset uclass rename?
Date: Wed, 11 May 2016 12:45:03 -0600 [thread overview]
Message-ID: <57337DAF.4060300@wwwdotorg.org> (raw)
Simon,
For Tegra186 support, I'd like to introduce a reset subsystem into
U-Boot, to support the reset DT bindings[1]. It'd be equivalent to the
existing reset subsystem in Linux. This binding/subsystem does/would
control reset of e.g. individual HW blocks in an SoC, or individual
chips on the board.
It looks like there's already a "reset" uclass (include/reset.h,
drivers/misc/reset*.c). However, that seems to address a slightly
different case; CPU- or system-level reset rather than individual blocks.
I'd like to propose renaming the existing uclass to sysreset (system
reset) to allow the new per-block/-module reset uclass/subsystem just
"reset". Does that make sense to you, or should I name the new
uclass/subsystem e.g. "module_reset"?
An alternative might be to extend the existing U-Boot reset subsystem to
cover the new use-case too. However, U-Boot's existing concepts of warm
vs. cold vs. power reset, and reset_walk_halt() don't exist in the reset
DT bindings, so my instinct is that combining the two doesn't make sense
semantically; I believe the sysreset API is a higher level concept that
may use the raw capabilities of the new reset API in some HW-specific
implementations.
[1]
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/reset
(in particular, reset.txt)
next reply other threads:[~2016-05-11 18:45 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-11 18:45 Stephen Warren [this message]
2016-05-11 19:01 ` [U-Boot] reset uclass rename? Simon Glass
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