linux-kernel - Re: [PATCH RFC] power: reset: restart-poweroff: convert to module

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Message-ID: <3344f3ab-8fba-4013-bc6a-8ec0246964b8@lunn.ch>
Date: Thu, 22 Feb 2024 15:55:42 +0100
From: Andrew Lunn <andrew@...n.ch>
To: "Sverdlin, Alexander" <alexander.sverdlin@...mens.com>
Cc: "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"sre@...nel.org" <sre@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC] power: reset: restart-poweroff: convert to module

> Yes, the code is platform-independent now and can be re-used for deployments
> which meant to be "always on".

You need to be careful with the meaning of "always on". It is always
on in that the hardware does not have any PMICs. It is impossible to
turn the power off. This is a poweroff driver, and it powers the
hardware off by dropping into the bootloader which then spins.

> One could actually even use it with off-the-shelf x86 hardware.

Is there off the shelf x86 which does not support turning the power
off? I'm not familiar with x86 that much, but it seems to be a feature
that has existed since the first IBM PC in 1980.

     Andrew