linux-kernel - Re: [PATCH v2] fsl-dma: allow Freescale Elo DMA driver to be compiled as a module

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Message-ID: <ed82fe3e0809251147t30743080v593d194eba731a7b@mail.gmail.com>
Date:	Thu, 25 Sep 2008 13:47:52 -0500
From:	"Timur Tabi" <timur@...escale.com>
To:	"Scott Wood" <scottwood@...escale.com>
Cc:	"Li Yang" <leoli@...escale.com>, linuxppc-dev@...abs.org,
	dan.j.williams@...el.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] fsl-dma: allow Freescale Elo DMA driver to be compiled as a module

On Thu, Sep 25, 2008 at 1:40 PM, Scott Wood <scottwood@...escale.com> wrote:

> If there's a dependency there, how will it work when this is built as a
> module?

There are no dependencies.  fsldma registers with the DMA engine,
which is always built in-kernel.  The DMA engine is what handles
linking DMA clients to DMA drivers. The DMA clients get a callback
whenever a DMA driver registers with the DMA engine.  If the DMA
driver is already registered when the client registers, then the
client will get a callback immediately after it registers.

I chose subsys_initcall() to increase the probability that fsldma is
already present when DMA clients are loaded/initialized and register.

-- 
Timur Tabi
Linux kernel developer at Freescale
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