[alsa-devel] [PATCH 03/11] ASoC: fsl: add sgtl5000 clock support for imx-sgtl5000

[Shawn Guo]

On Wed, May 02, 2012 at 12:41:22PM +0100, Mark Brown wrote:
> We generally try to keep the clock API out of CODEC drivers due to the
> issues with the clock API that the generic implementation is intended to
> help us solve.
> 
> The major problem here is that we can't rely on having the clock API
> present at all on most platforms so as soon as we start adding clock
> support into things we have to do a performance with HAVE_CLK which is
> at best annoying.
> 
Is this something that the series below tries to solve?

http://thread.gmane.org/gmane.linux.ports.arm.kernel/163652

Regards,
Shawn

> There's also the fact that even if the clock API is available we've no
> way to register a clock consistently and since the audio clock tree
> often needs management off-SoC for at least some components when the
> clock API is in use you end up having to handle clock trees that go into
> and out of the clock API.
> 
> The upshot of this is that while we really should be using the clock API
> for clocks the API as it stands is somewhat difficult to deploy in cross
> platform code.  What I'd suggest is connecting the clock to the CODEC in
> the device tree but actually doing the clk_get() in the machine driver.