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

Timur Tabi
2008-09-25T18:48:05Z

On Thu, Sep 25, 2008 at 1:40 PM, Scott Wood <scottwood@freescale.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