Re: [alsa-devel] [RFC-PATCH 0/2] ASoC: simple_card: support for hw-params rules

On 05/20/2016 02:30 PM, kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org wrote:

From: Martin Sperl <redacted>

Simple_card does require under some circumstances the ability
to configure certain hw_parameters based on clocks, bits, channels.

This patchset adds a generic way to configure these kind of things
via the device tree easily. This patchset implements this
for simple_card, but other drivers can just as easily make use of
this.

For now we have the following matchers and actions:
* matchers:
  * match_sample_bits
  * match_rate
  * match_channels
* actions:
  * set_fixed_bclk_size

As a note: the available matching rules and action rules right now
are hard-coded, but this could in principle get extended to be more
dynamic via kallsyms_lookup_name that would lookup the requested
symbol and assume it is a struct asoc_generic_hw_params_method,
on which it could apply several sanity-checks before using
the pointers for real.

How about allowing to embed eBPF bytecode in the DT that can be installed as
a constraint set? This would allow maximum for flexibility and also make the
implementation a lot easier.
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