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

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Message-ID: <CAOh2x=ntwp22Z3sHf9QehVwab--ZayF-kmTpZsjbkyQYVxrzpw@mail.gmail.com>
Date:	Thu, 27 Sep 2012 15:41:12 +0530
From:	viresh kumar <viresh.kumar@...aro.org>
To:	Vinod Koul <vinod.koul@...ux.intel.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	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 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*...

This is what i was thinking when i questioned multiple device  creation...

--
viresh
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