linux-kernel - Re: [PATCH] powerpc: dts: replace 'linux,stdout-path' with 'stdout-path'

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Date:   Thu, 1 Mar 2018 07:39:06 -0600
From:   Rob Herring <robh@...nel.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH] powerpc: dts: replace 'linux,stdout-path' with 'stdout-path'

On Wed, Feb 28, 2018 at 7:33 PM, Michael Ellerman <mpe@...erman.id.au> wrote:
> Rob Herring <robh@...nel.org> writes:
>
>> 'linux,stdout-path' has been deprecated for some time in favor of
>> 'stdout-path'. Now dtc will warn on occurrences of 'linux,stdout-path'.
>> Search and replace all the of occurrences with 'stdout-path'.
>
> This patch looks OK.
>
> But please remember that not all device trees are generated with dtc, we
> still have machines in the wild that have firmware which use
> "linux,stdout-path" and may never be updated.

Absolutely. The core code still supports both.

The only scenario I could come up with is someone has an old
bootloader that only understands linux,stdout-path and modifies it and
they update the dtb. We may end up with both properties with
stdout-path taking preference.

Rob