[alsa-devel] [PATCH v7 2/2] ASoC: fsl: Add S/PDIF machine driver

Mark Brown broonie at kernel.org
Mon Aug 19 13:45:22 CEST 2013

On Mon, Aug 19, 2013 at 12:31:21PM +0100, Mark Rutland wrote:
> On Mon, Aug 19, 2013 at 11:52:01AM +0100, Mark Brown wrote:

> > This is intended to allow userspace to distinguish between systems that
> > are electrically identical but physically distinct, for example when
> > multiple systems are derived from the same reference design.

> I see. Surely if there's some meaning imparted to userspace by the model
> name, there's a contract there that we should document (the set of valid
> model names and what they correspond to)?

In theory I guess.  In practice I doubt many people will bother and I'd
expect zero productive result from those that do.

> I'm not sure I understand why userspace needs to know what the system is
> if we've adequately described how it's wired and what its capabilities
> are. However, I'm not at all familiar with the way we handle audio, so
> please forgive my naivety there :)

The physical form of the system can have a substantial impact on how
people want to configure it at runtime even if there is no software
visible difference.  Coefficients can be chosen to work with plastics,
or volumes adjusted for expected user positioning with respect to the
hardware for example.
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