linux-kernel - Re: [PATCH] ARM: dts: am33xx: add aliases for mmc interfaces

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Message-ID: <YBuYFkNFxH8Ngtny@atomide.com>
Date:   Thu, 4 Feb 2021 08:45:42 +0200
From:   Tony Lindgren <tony@...mide.com>
To:     Måns Rullgård <mans@...sr.com>
Cc:     Benoît Cousson <bcousson@...libre.com>,
        Rob Herring <robh+dt@...nel.org>, linux-omap@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: am33xx: add aliases for mmc interfaces

* Måns Rullgård <mans@...sr.com> [210129 11:40]:
> Tony Lindgren <tony@...mide.com> writes:
> 
> > * Mans Rullgard <mans@...sr.com> [210128 18:09]:
> >> Without DT aliases, the numbering of mmc interfaces is unpredictable.
> >> Adding them makes it possible to refer to devices consistently.  The
> >> popular suggestion to use UUIDs obviously doesn't work with a blank
> >> device fresh from the factory.
> >> 
> >> See fa2d0aa96941 "mmc: core: Allow setting slot index via device tree
> >> alias" for more discussion.
> >
> > Sounds good to me, but will wait a few days before applying to make sure
> > this is still what we have agreed on :)
> 
> If it helps the decision, my existing systems fail to boot without
> something like this due to the eMMC moving from /dev/mmcblk1 to mmcblk0,
> at least sometimes.  I guess the kernel cares deeply about not breaking
> userspace, except when it doesn't give a damn.
> 
> I've been fighting this problem in various forms for the last 10 years
> or so, and I was hoping it would finally be over.

Yes this issue has been bugging folks for long time. Applying into fixes
thanks.

Tony