linux-kernel - Re: [PATCH] soundwire: fix initializing sysfs for same devices on different buses

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Message-ID: <c7e9aef7-d90d-4eb5-b4fd-72857346dcad@sirena.org.uk>
Date:   Wed, 4 Oct 2023 20:08:24 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Takashi Iwai <tiwai@...e.de>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] soundwire: fix initializing sysfs for same devices on
 different buses

On Wed, Oct 04, 2023 at 03:00:40PM -0400, Pierre-Louis Bossart wrote:
> On 10/4/23 11:40, Mark Brown wrote:

> > FWIW DT is much less affected here since all the inter-device references
> > are explicit in the DT (modulo needing to work around breakage) so we're
> > not hard coding in the way ACPI so unfortunately requires.

> Isn't there a contradiction between making "all inter-device references
> explicit in the DT" and having a device name use an IDA, which cannot
> possibly known ahead of time?

No, the thing with DT is that we don't use the device name for binding
at all - it's printed in things but it's not part of how we do lookups
(unless there's something I didn't notice in the Soundwire specifics I
guess).  Lookups are done with inter-node references in the DT.

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