linux-kernel - Re: [PATCH] devicetree - document using aliases to set spi bus number.

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Message-ID: <CAL_JsqJwQvPGtscheZjoJyhF1UPxDSqbS-QB9qm3M4HbpOicVA@mail.gmail.com>
Date:	Wed, 25 May 2016 20:44:24 -0500
From:	Rob Herring <robh@...nel.org>
To:	Christer Weinigel <christer@...nigel.se>
Cc:	Mark Brown <broonie@...nel.org>,
	Frank Rowand <frowand.list@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH] devicetree - document using aliases to set spi bus number.

On Wed, May 25, 2016 at 8:10 PM, Christer Weinigel <christer@...nigel.se> wrote:
> On 05/25/2016 08:44 PM, Mark Brown wrote:
>> On Wed, May 25, 2016 at 11:06:46AM -0700, Frank Rowand wrote:
>>> On 5/25/2016 10:49 AM, Rob Herring wrote:
>>
>>>> Things get undocumented all the time when we deprecate them.
>>
>>> If it is deprecated then it should be documented as deprecated
>>> so people do not attempt to use it.
>>
>> Or we could just remove the code, we don't appear to have any in
>> tree users anyway (the few in tree aliases for SPI buses I can see
>> are string based).
>
> Lovely.  "Here's something that's simple and useful for users.  Let's
> break it".  What part of "we do not break userspace" do you not
> understand?  Because that would be a user visible change.

The other saying is "if it is not upstream, it doesn't exist." That
said, I don't think we should remove it. Maybe some time later, but
first we need a suitable alternative.

Rob