linux-kernel - Re: [PATCHv3 5/7] dmaengine: dw_dmac: add PCI part of the driver

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Message-ID: <CAHp75Vd+_SBHkUf2DfSq=-nwWdC99jNx+VEuq4mb99aB7xGDNw@mail.gmail.com>
Date:	Wed, 3 Oct 2012 16:40:09 +0300
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Vinod Koul <vinod.koul@...ux.intel.com>
Cc:	viresh kumar <viresh.kumar@...aro.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	linux-kernel@...r.kernel.org,
	spear-devel <spear-devel@...t.st.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Subject: Re: [PATCHv3 5/7] dmaengine: dw_dmac: add PCI part of the driver

On Thu, Sep 27, 2012 at 1:32 PM, Vinod Koul <vinod.koul@...ux.intel.com> wrote:
> On Thu, 2012-09-27 at 15:41 +0530, viresh kumar wrote:
>> On Thu, Sep 27, 2012 at 3:31 PM, Vinod Koul <vinod.koul@...ux.intel.com> wrote:
>> > Let me try again.
>> >
>> > what does it take to do platform and PCI driver for this:
>> > 1. make dma h/w access (read/write) platform independent. which you have
>> > already done
>> > 2. Device registration: Create two probes, or use common probe.
>> > You smartly chose the second one BUT by creating another device.
>> > If you look closely at the probe then I would say it would be easy to
>> > create library for probe which can be used across both pci and platform
>> > driver probes. The probe library which initializes driver and registers
>> > with dmaengine needs device struct and resources can be provided by each
>> > probe.
>>
>> Or in other words... create three files
>> - dw_dmac.c
>> - dw_dmac-pltfm.c
>> - dw_dmac-pci.c...
>>
>> Don't do anything specific to platform or pci in dw_dmac.c...
>> Keep pltfm and pci files to smallest possible size, and keep as much of
>> common part in dmac.c...
>>
>> Similar is done in drivers/mmc/host/sdhci*...
> Yes that IMHO would be simpler approach :)
Oh, thanks, I got the idea. Will implement soon.

-- 
With Best Regards,
Andy Shevchenko
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