linux-kernel - Re: [PATCH 2/4 V2] dt-bindings: Add root properties for Raspberry Pi

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Message-ID: <54D8F724.4080609@wwwdotorg.org>
Date:	Mon, 09 Feb 2015 11:06:28 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Stefan Wahren <stefan.wahren@...e.com>
CC:	linux-kernel@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, lee@...nel.org, pawel.moll@....com,
	linux@....linux.org.uk, robh+dt@...nel.org,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	mark.rutland@....com
Subject: Re: [PATCH 2/4 V2] dt-bindings: Add root properties for Raspberry
 Pi

On 01/19/2015 12:01 PM, Stefan Wahren wrote:
> Hi Stephen,
>
>> Stephen Warren <swarren@...dotorg.org> hat am 19. Januar 2015 um 18:13
>> geschrieben:
>>
>>
>> On 01/19/2015 04:00 AM, Stefan Wahren wrote:
>>> This patch adds root compatible properties for the following boards:
>>> - Raspberry Pi Model A
>>> - Raspberry Pi Model A+
>>> - Raspberry Pi Model B
>>> - Raspberry Pi Model B (no P5)
>>> - Raspberry Pi Model B rev2
>>> - Raspberry Pi Model B+
>>> - Raspberry Pi Compute Module
>>
>> Acked-by: Stephen Warren <swarren@...dotorg.org>
>>
>> This seems sane to me. One thing I should have asked: What compatible
>> values does the RPi Foundation's downstream for all these cases?
>
> good point. Unfortunately my patches to linux-rpi-kernel are held back because
> of too many recipients, so it's possible that someone complain later.
>
> I have looked at chapter 3.1 in [1], but didn't find the any other variants than
> B and B+:
>
>    Here, the presence or absence of the "-plus" is the significant thing, not the
> "b" -- Model A's and A+'s will
>    use the "b" and "b-plus" variants, respectively.
>
> Also in the newest branch [2]:
>
> bcm2835-rpi-b.dts      -> model = Raspberry Pi Model B
> bcm2708-rpi-b.dts      -> model = Raspberry Pi Model B
> bcm2708-rpi-b-plus.dts -> model = Raspberry Pi Model B+
>
> Sorry, i don't have any experience with the downstream kernel. So please correct
> me if looked at the wrong places.
>
> [1] -
> https://github.com/raspberrypi/documentation/blob/master/configuration/device-tree.md
> [2] - https://github.com/raspberrypi/linux/tree/rpi-3.18.y/

This all matches what I found. I think differentiating between A/B and 
A+/B+ makes sense, so the compatible values in your patch should be 
fine; I'll reply to v2 in just a minute.
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