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

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Message-ID: <CAFr9PXn9nzw=kmWqv_ZPZshhGuh0iAW5b=Csygt6WZOnmd2tig@mail.gmail.com>
Date: Wed, 14 Jan 2026 19:01:58 +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 Tue, 13 Jan 2026 at 03:27, Kuan-Wei Chiu <visitorckw@...il.com> wrote:
>
> Add a new driver for the 'virt-ctrl' device found on QEMU virt machines
> (e.g. m68k). This device provides a simple interface for system reset
> and power off [1].
>
> This driver registers a restart handler for system reboot and sets the
> global pm_power_off callback for system shutdown. It is designed to be
> generic and can be reused by other architectures utilizing this QEMU
> device.
>
> Link: https://gitlab.com/qemu-project/qemu/-/blob/v10.2.0/hw/misc/virt_ctrl.c [1]
> Signed-off-by: Kuan-Wei Chiu <visitorckw@...il.com>

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.

Cheers,

Daniel