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Date:   Wed, 4 Oct 2023 16:40:16 +0100
From:   Mark Brown <broonie@kernel.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        Vinod Koul <vkoul@kernel.org>,
        Bard Liao <yung-chuan.liao@linux.intel.com>,
        Sanyog Kale <sanyog.r.kale@intel.com>,
        Philippe Ombredanne <pombredanne@nexb.com>,
        Takashi Iwai <tiwai@suse.de>, alsa-devel@alsa-project.org,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH] soundwire: fix initializing sysfs for same devices on
 different buses
Message-ID: <d648c3d1-53ac-4021-ac7f-6a81f1a72dd3@sirena.org.uk>
References: <20231004130243.493617-1-krzysztof.kozlowski@linaro.org>
 <6628a5f6-ed22-4039-b5c2-2301c05c7e3e@linux.intel.com>
 <2023100453-perfected-palm-3503@gregkh>
 <624b044a-1f0f-4961-8b57-cb5346e7b0d3@linux.intel.com>
 <2023100452-craziness-unpopular-7d97@gregkh>
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On Wed, Oct 04, 2023 at 11:16:09AM -0400, Pierre-Louis Bossart wrote:

> > matching the name is fine (if you are matching it against an existing
> > name) but expecting the name to be anything specific is not going to
> > work as the name is dynamic and can/will change each boot.

> Not following, sorry.

> In the SoundWire context, the device name directly follows the ACPI or
> Device Tree information, I don't really see how its name could change on
> each boot (assuming no DSDT override or overlays of course). The
> platform descriptors are pretty much fixed, aren't they?

> Intel and AMD make such assumptions on names for pretty much all machine
> drivers, it's not really something new - probably 15+ years? Adding Mark
> Brown in CC: to make sure he's aware of this thread.

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.

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