Re: [RFC 1/4] ASoC: topology: Add topology UAPI header.

[Mark Brown <broonie@kernel.org>]

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On Tue, Apr 21, 2015 at 06:46:28PM +0200, Lars-Peter Clausen wrote:
> On 04/21/2015 06:35 PM, Mark Brown wrote:

> >The trouble with the ABI version information is that it tells new
> >kernels how to handle old tables but old kernels will have no idea what
> >to do with new firmwares.

> What I did for the SigmaDSP firmware format (which can hopefully be
> superseded by this) is to have a header which a block type and the block
> length for each block for exactly this reason. It allows fully backward and
> forward compatibility between kernel versions and does not require a change
> in the ABI each time a new type of block is added. It also keeps the parser
> simple since it does not have to know the size and also makes support for
> vendor blocks quite easy, since the processing of those can be offloaded to
> some vendor callbacks without the core having to be informed what the
> content or size of those vendor blocks is.

Yes, that's what the ex-Wolfson stuff does too (it also has ABI
versioning but most things shouldn't need it).

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