linux-kernel - Re: [PATCH v3 13/13] scsi: ufs: Add exynos ufs platform data

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Date:	Mon, 05 Oct 2015 16:47:02 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Rob Herring <robh@...nel.org>
Cc:	Yaniv Gardi <ygardi@...eaurora.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	kbuild test robot <lkp@...el.com>, kbuild-all@...org,
	linux-scsi@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"James E.J. Bottomley" <JBottomley@...n.com>,
	vinayak holikatti <vinholikatti@...il.com>,
	Amit Kachhap <amit.daniel@...sung.com>,
	Seungwon Jeon <essuuj@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 13/13] scsi: ufs: Add exynos ufs platform data

On Monday 05 October 2015 09:11:33 Rob Herring wrote:
> On Mon, Oct 5, 2015 at 4:06 AM, Arnd Bergmann <arnd@...db.de> wrote:
> > On Monday 05 October 2015 13:44:29 Alim Akhtar wrote:
> >>
> >> On 10/01/2015 04:59 PM, Arnd Bergmann wrote:
> >> > On Thursday 01 October 2015 18:46:34 kbuild test robot wrote:
> >> > Ah, this seems to be a case of layering violation. It would be best to
> >> > restructure the code so that the exynos driver registers a platform_driver
> >> > by itself for the respective DT compatible string, and then calls
> >> > into the common code from its probe function, rather than having the
> >> > generic driver know about the specific backends.
> >> >
> >> > That approach will also make the generic driver more scalable as we
> >> > add further chip-specific variations, and matches what we do in other
> >> > drivers.
> >> >
> >>
> >> Looks like some discussions on ufs variant driver probe method happened
> >> here [1] few months back.
> >> [1]-> https://lkml.org/lkml/2015/6/3/180
> >
> > Hmm, too bad we didn't catch it then, it's much more work to fix now.
> 
> What you suggested is what is being implemented[1]. It is not merged
> yet. The core is a library and the platform specific parts create the
> driver.
> 
> Rob
> 
> [1] https://lkml.org/lkml/2015/9/2/364

Ah, good. Sorry for the misunderstanding on my side.

	Arnd
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