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

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Message-ID: <1348741972.1648.28.camel@vkoul-udesk3>
Date:	Thu, 27 Sep 2012 16:02:52 +0530
From:	Vinod Koul <vinod.koul@...ux.intel.com>
To:	viresh kumar <viresh.kumar@...aro.org>
Cc:	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, 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 :)


-- 
~Vinod

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