linux-kernel - Re: [PATCH] ARM: dts: tegra: move serial aliases to per-board

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Date:	Wed, 12 Nov 2014 11:14:40 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Thierry Reding <thierry.reding@...il.com>,
	Olof Johansson <olof@...om.net>
CC:	gnurou@...il.com, linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	gregkh@...ux-foundation.org
Subject: Re: [PATCH] ARM: dts: tegra: move serial aliases to per-board

On 11/12/2014 05:20 AM, Thierry Reding wrote:
> On Tue, Nov 11, 2014 at 12:49:30PM -0800, Olof Johansson wrote:
>> There are general changes pending to make the /aliases/serial* entries
>> number the serial ports on the system. On tegra, so far the ports have been
>> just numbered dynamically as they are configured so that makes them change.
>>
>> To avoid this, add specific aliases per board to keep the old numbers. This
>> allows us to change the numbering by default on future SoCs while keeping the
>> numbering on existing boards.
...
> I have applied this to the for-3.19/dt branch. So for anything that is
> post Tegra124 the new rule shall be to add aliases to the SoC .dtsi and
> then use consistent numbering of UART ports across boards?
>
> The alternative is to remain consistent with what this patch does, which
> would be to make the serial port numbering a property of the board. That
> doesn't sound too bad to me either since it'll hide all the unused ports
> on a given board.

For new SoCs, I think board-specific aliases would make most sense. That 
would be consistent with this patch. The only question I had was for 
existing SoCs, should we make the switch this patch does, or leave the 
aliases inactive there? New SoCs should use more sensible aliases.
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