linux-kernel - Re: [PATCH v5] mfd: syscon: Decouple syscon interface from platform devices

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Message-ID: <3291391.H71MjevFsA@wuerfel>
Date:	Fri, 26 Sep 2014 11:14:30 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Joachim Eastwood <manabian@...il.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Pankaj Dubey <pankaj.dubey@...sung.com>,
	Douglas Anderson <dianders@...omium.org>,
	kgene.kim@...sung.com,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Heiko Stübner <heiko@...ech.de>,
	naushad@...sung.com, Li.Xiubo@...escale.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Tomasz Figa <tomasz.figa@...il.com>,
	linux-samsung-soc@...r.kernel.org, thomas.ab@...sung.com,
	vikas.sajjan@...sung.com, chow.kim@...sung.com,
	Lee Jones <lee.jones@...aro.org>,
	sunil joshi <joshi@...sung.com>, b29396@...escale.com
Subject: Re: [PATCH v5] mfd: syscon: Decouple syscon interface from platform devices

On Friday 26 September 2014 09:48:24 Joachim Eastwood wrote:
> On 26 September 2014 09:16, Arnd Bergmann <arnd@...db.de> wrote:
> > On Friday 26 September 2014 07:34:12 Joachim Eastwood wrote:
> >> I am working on Cortex-M4 no-MMU platform that isn't upstream yet, btw.
> >>
> >
> > Sorry for drifting off-topic, but this is very interesting to me. Can you
> > say which one you are working on and what your timeline is for submitting
> > it upstream?
> 
> It's NXP LPC18xx/43xx which is Cortex-M3/M4.
> 
> 3.19 or 3.20 might be target.

Ah, very nice!

> Right now everything is in a github repository here:
> https://github.com/manabian/linux-lpc
> 
> Most stuff are working now and I am in the process of clean it up and
> adding documentation.

Ok, looks like you are making good progress. I noticed three high-level
issues that you may want to address:

- the watchdog driver should use the generic watchdog framework rather
  than registering a misc device.
- the ehci glue can probably go away if you make very small changes
  to the generic ehci platform driver
- I don't like the way that the stmmac glue drivers are added, I thought
  we had fixed this before but I think I need to dig up old emails.
  The driver should really be a loadable module that hooks calls into
  the common code rather than being linked into one module.

I also have a plan for doing multiplatform builds of nommu kernels, 
for build testing mostly, I wouldn't expect you to run that configuration.
No need for you to address that yourself though, we'll get there.

	Arnd
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