linux-kernel - RE: [PATCH v5 2/3] arm:davinci: move emif driver to mfd framework

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Date:	Tue, 28 Feb 2012 05:44:39 +0000
From:	"Manjunathappa, Prakash" <prakash.pm@...com>
To:	Samuel Ortiz <sameo@...ux.intel.com>
CC:	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Nori, Sekhar" <nsekhar@...com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>
Subject: RE: [PATCH v5 2/3] arm:davinci: move emif driver to mfd framework

Hi Samuel,

On Mon, Feb 27, 2012 at 19:56:38, Samuel Ortiz wrote:
[snip]
> So it seems you're passing a platform devices array through your mfd aemif
> platform data pointer. And from what I can see, it's mostly a 1 entry array
> (for the NAND case) or a 2 entries array (for the NAND and NOR case).
> In that case, adding an MFD driver in the middle brings basically nothing but
> confusion and overhead (and 200+ lines of code).
> So unless someone explains to me how this is doing any good to the kernel in
> general, I'm not going to take this patchset.
> 
> Cheers,
> Samuel.
>

In this way we trying to isolate future modification of aemif driver not to depict
as platform code change, the need for this is based on discussion in below thread
http://davinci-linux-open-source.1494791.n2.nabble.com/PATCH-arm-davinci-configure-davinci-aemif-chipselects-through-OF-tt7059739.html#none

Earlier also concern was expressed to move aemif driver out of arch/arm to drivers folder.
Here is the link for the same: http://lists.infradead.org/pipermail/linux-mtd/2011-August/037308.html
Since aemif driver supports NAND/NOR devices, we feel MFD is the place holder.

Thanks,
Prakash

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