linux-kernel - Re: [PATCH 2/3] ARM: sunxi: Add an ahci-platform compatible AHCI driver for the Allwinner SUNXi series of SoCs

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Date:	Wed, 04 Dec 2013 14:16:49 +0100
From:	Olliver Schinagl <oliver+list@...inagl.nl>
To:	Tejun Heo <tj@...nel.org>
CC:	Oliver Schinagl <oliver@...inagl.nl>, grant.likely@...aro.org,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, dev@...ux-sunxi.org,
	maxime.ripard@...e-electrons.com, ijc@...lion.org.uk,
	hdegoede@...hat.com
Subject: Re: [PATCH 2/3] ARM: sunxi: Add an ahci-platform compatible AHCI
 driver for the Allwinner SUNXi series of SoCs

On 04-12-13 14:14, Tejun Heo wrote:
> Hello,
>
> On Wed, Dec 04, 2013 at 01:56:23PM +0100, Oliver Schinagl wrote:
>> I took the imx driver as example, as I wasn't sure on where to
>> start. But I don't think it's possible yet without improving
>> ahci_platform as I suggested in the cover letter. So if
>> ahci_platform needs to be improved, I guess a separate patch series
>> would be more appropriate?
>>
>> So would it be acceptable to have this as the 2nd (and last?)
>> ahci_platform driver and go from there? Or do you want to block new
>> ahci_XXX drivers until ahci_platform has been improved?
>
> I don't want to block new drivers unconditionally but at least I want
> to know which direction we're headed in the longer term.  Right now it
> feels like we could be at the beginning of an uncoordinated explosion
> of these drivers which will take a hell lot mpore effort to clean up
> after the fact.  I could be wrong and these could actually be
> different enough to justify separate drivers and there isn't gonna be
> an avalanche of these but again I at least want to know the general
> direction things are headed before making any decisions.
I'd be happy to pour it in any form that's needed. I even do the 
modification/rewrite of ahci_platform if I get enough help as it might 
be a little over my head initially ;)

That said, I don't think it's much different at all and I do think it 
could be much simpler. In my mind, the sunxi_ahci driver wouldn't need 
to be much bigger then a few lines that are specific to the SoC 
(hardware init) and registerd to the ahci_platform framework via 
platform_ahci_register() instead of platform_device_register().

But again, point me (for dummies ;) in the right direction and I'll work 
on it with some help.

Oliver
>
> Thanks.
>

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