linux-kernel - Re: [PATCH v1 0/3] introduce priority-based shutdown support

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Message-ID: <ZWSmlfWYSbQHVvOk@finisterre.sirena.org.uk>
Date:   Mon, 27 Nov 2023 14:24:21 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Matti Vaittinen <mazziesaccount@...il.com>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-pm@...r.kernel.org,
        Søren Andersen <san@...v.dk>
Subject: Re: [PATCH v1 0/3] introduce priority-based shutdown support

On Mon, Nov 27, 2023 at 01:08:24PM +0000, Greg Kroah-Hartman wrote:

> Yes, using device tree would be good, but now you have created something
> that is device-tree-specific and not all the world is device tree :(

AFAICT the idiomatic thing for ACPI would be platform quirks based on
DMI information.  Yay ACPI.  If the system is more Linux targetted then
you can use _DSD properties to store DT properties, these can then be
parsed out in a firmware interface neutral way via the fwnode API.  I'm
not sure there's any avoiding dealing with firmware interface specifics
at some point if we need platform description.

> Also, many devices are finally moving out to non-device-tree busses,
> like PCI and USB, so how would you handle them in this type of scheme?

DT does have bindings for devices on discoverable buses like PCI - I
think the original thing was for vendors cheaping out on EEPROMs though
it's also useful when things are soldered down in embedded systems.

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