On Thu, Dec 29, 2016 at 12:34:03PM +0100, Marek Szyprowski wrote:
> For some unknown (maybe historical?) reasons support for secondary I2S DAI
> was implemented by adding additional virtual platform device, which was
> then probed again with the main I2S driver. This pattern is really hard
> to follow and provides no benefits, so lets remove this hack and register
> both DAIs during linear probe of Exynos I2S controller driver.

It's historical, there used to be limitations that made it impossible to
register multiple devices to one DAI IIRC.