[alsa-devel] [PATCH] ASoC: Tegra and i.MX are mutually exclusive

Arnd Bergmann arnd at arndb.de
Mon Jun 24 18:00:13 CEST 2013

On Monday 24 June 2013 09:28:08 Stephen Warren wrote:
> On 06/24/2013 09:04 AM, Arnd Bergmann wrote:
> > Both Tegra and i.MX provide ac97 operations, which can only
> > exist once in the kernel. They can both be built as loadable
> > modules (only one of them needs to be loaded anyway), but we
> > have to disallow enabling them both as built-in.
> > diff --git a/sound/soc/fsl/Kconfig b/sound/soc/fsl/Kconfig
> >  menuconfig SND_IMX_SOC
> >       tristate "SoC Audio for Freescale i.MX CPUs"
> >       depends on ARCH_MXC
> > +     depends on SND_SOC_TEGRA=n || (SND_SOC_TEGRA=m && m)
> I can easily see how this prevents adding SND_IMX_SOC to a config if
> SND_SOC_TEGRA is enabled, but I'm not sure about the other way around;
> does Kconfig check that adding a new SND_SOC_TEGRA wouldn't invalidate
> any of the depends of any already-selected options?

If you start out with a config that has SND_IMX_SOC and select
SND_SOC_TEGRA, SND_IMX_SOC gets turned off.

> In other words, do you need to make the "same" change to Tegra?

No, that would create a circular dependency that is not allowed
in Kconfig.


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