linux-kernel - Re: [PATCH 1/2] power: reset: Add QEMU virt-ctrl driver

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Message-ID: <CAFr9PXn66L8FxEydCrRDR=_pVtspsFO9hOvZuWNtEB5z=9Ds+Q@mail.gmail.com>
Date: Thu, 15 Jan 2026 22:29:29 +0900
From: Daniel Palmer <daniel@...f.com>
To: Kuan-Wei Chiu <visitorckw@...il.com>
Cc: geert@...ux-m68k.org, sre@...nel.org, jserv@...s.ncku.edu.tw, 
	eleanor15x@...il.com, linux-kernel@...r.kernel.org, 
	linux-m68k@...ts.linux-m68k.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH 1/2] power: reset: Add QEMU virt-ctrl driver

Hi Kuan-Wei,

On Thu, 15 Jan 2026 at 15:15, Kuan-Wei Chiu <visitorckw@...il.com> wrote:

> > FWIW: I have a driver for this in my "m68k with devicetree" tree. As
> > far as I could tell the virt_ctrl thing in QEMU might get more
> > features aside from power control.
> > So I made it a misc device instead.
>
> Thanks for the note.
> Just out of curious, are there currently specific plans to add
> non-power features to virt_ctrl?

The docs here suggest that power control is the only currently
implemented feature but doesn't have to be the only feature:
https://github.com/qemu/qemu/blob/master/docs/specs/virt-ctlr.rst

> If new features are added, shouldn't they be exposed via separate
> drivers in their respective subsystems, rather than consolidating
> everything into a misc driver?

I guess if it did get new features maybe it'd be a multifunction
device? Since nothing except power control has ever actually been
implemented, maybe the way you have it right now makes the most sense.

Thanks,

Daniel