linux-kernel - Re: [PATCH v2] PL330: Add PL330 DMA controller driver

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Date:	Fri, 26 Mar 2010 07:36:08 +0900
From:	jassi brar <jassisinghbrar@...il.com>
To:	Linus Walleij <linus.ml.walleij@...il.com>
Cc:	Joonyoung Shim <jy0922.shim@...sung.com>, dan.j.williams@...el.com,
	kyungmin.park@...sung.com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Ben Dooks <ben-linux@...ff.org>
Subject: Re: [PATCH v2] PL330: Add PL330 DMA controller driver

On Fri, Mar 26, 2010 at 12:20 AM, Linus Walleij
<linus.ml.walleij@...il.com> wrote:
> 2010/3/25 jassi brar <jassisinghbrar@...il.com>:
>> And if this patch is accepted, there
>> _will_ exist two copies of the PL330 driver -- one in drivers/dma/pl330_dmac.c
>> and another in arch/arm/plat-samsung/. Only the former will be lying unused
>> until some other SoC vendor decided to use PL330, because S3C has come too
>> long a way to change its drivers to driver/dma/ API and modify DMA
>> drivers for every SoC.
>
> What's wrong with merging them later then? Refactoring FTW.
The amount of code that will be modified or taken out of drivers/dma/pl330_dmac
will so much that I will be left only with constrained data structures in
the file to do tricks to make it work with the PL330 engine driver.
I am not very keen on authoring the driver/dma/ driver but neither am I
interested in having to cleanup someone else' code.

>> I have the pl330-core part almost ready, but i need time to implement
>> some _testable_
>> implementation of the scheme. If maintainers want to see structure of
>> my code, I can
>> share it too, but I think I pretty much made it clear.
>
> Why not just post it on the list? I'm curious! Since I'm working on a PrimeCell
> DMA API I would love to look at PrimeCell DMA engine drivers.
I'll post in a day or two when the PL330 core driver takes come shape
closer to what it is supposed to look.
That will help me getting suggestions for improvement, i hope.

regards.
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