linux-kernel - Re: [Arm-netbook] getting allwinner SoC support upstream (was Re: Uploading linux (3.9.4-1))

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Date:	Fri, 7 Jun 2013 20:08:24 +0100
From:	"luke.leighton" <luke.leighton@...il.com>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Olof Johansson <olof@...om.net>,
	"jonsmirl@...il.com" <jonsmirl@...il.com>,
	devicetree-discuss <devicetree-discuss@...abs.org>,
	Stephen Warren <swarren@...dotorg.org>,
	"luke.leighton" <luke.leighton@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	debian-arm <debian-arm@...ts.debian.org>,
	Linux on small ARM machines 
	<arm-netbook@...ts.phcomp.co.uk>,
	ARM Linux Mailing List <linux-arm-kernel@...ts.infradead.org>,
	debian-kernel <debian-kernel@...ts.debian.org>
Subject: Re: [Arm-netbook] getting allwinner SoC support upstream (was Re:
 Uploading linux (3.9.4-1))

On Fri, Jun 7, 2013 at 7:57 PM, Wookey <wookey@...kware.org> wrote:
> OK, this sounds good. Could you say who the allwinner engineers are?

 [cross-over: i asked him if he'd be happy to let me know privately,
so i have at least some context when speaking to the Directors]

> I
> guess it's quite a large organisation, so if Crazy Luke can say 'the
> work of mainline integration using device-tree is already being done
> by $these $people, please talk to them to help move it along', that
> might help get everyone on the same page.

 .... *mull*, *mull*... yes exactly!

> If it's like many large organisations, some bits of it will 'get it'
> and see why, in the long term, mainline integration is worthwhile, but
> other bits will look at what they have now and their android focus,
> and decide it's easier to keep doing what they are doing.
>
> There is a lot of hardware using these socs, and I'd love to be able
> to use that with mainstream stuff, rather than random vendor piles,
> and specific android kernels, so anything we can do to help make that
> happen is good.
>
>> So yes, Allwinner has an evil vendor tree (c), with a solution similar yet
>> inferior (because not generic enough) to the device tree, but they show
>> interest on going down the mainline road.
>
> So, luke: mainline is not going to support fex directly, whatever you
> or allwinner do. The advantages to allwinner of working with mainline
> are:
> 1) Ability to use whatever (kernel supported) hardware they like with
> new designs, with no driver work
> 2) Ability to use latest kernels and thus whatever shiny goodies those
> include
> 3) No need to do fex-ready drivers for new hardware
> 4) No need to keep backporting new kernels to add fex integration
> forevermore

 hooraaaaay - thank you wookey, this is exactly what i need.
cut/paste, straight into the report.

> If they want to keep existing tools and fex workflow then a fex<->DT
> translation tool will be needed.

 in-kernel or external tool?

> (It's not clear to me to what degree
> DT can simply be used instead directly)

 TBD.  input here, anyone?
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