[alsa-devel] [PATCH v4] ASoC: simple-card: add Device Tree support

Kuninori Morimoto kuninori.morimoto.gx at renesas.com
Thu Nov 21 01:41:49 CET 2013

Hi Rob

> >> Still not really a fan of this generic name. Can we define in the
> >> description above what simple means.
> >
> > So, how about "simple-audio-card" ?
> That's missing my point. First, I think you should be defining the
> actual h/w in the DT and doing the mapping of that to a simple audio
> driver in the kernel. Otherwise how do you fix some quirk on a
> particular platform later on without updating the DTB? I'm fine with
> this being the default compatible string, but you should also require
> a more specific name. Perhaps it is just <soc>-simple-audio or
> <board>-simple-audio.
> Second, you need to define in this binding document what simple means.
> What properties of the audio subsystem make it simple? The h/w has and
> doesn't have what? How do I decide if my platform can or should use
> this binding?

Basically, on ASoC case, SoC/board needs <soc>-<codec>-audio-card
(= not simple card) for matching each other, and this is start point.
This means we need many <soc>-<codec>-audio-card.c driver.
But, in some case, the difference between
<socA>-<codecA> <-> <socA>-<codecB> <-> <socB>-<codecA> <-> <socB>-<codecB>
was just "name". creating too many such driver was not sane for me.
This simple-audio is used in such case.
Of course we can update simple-audio feature
(if it is very simple/common feature)
but, if you need <soc/board>-audio-card which needs special feature,
you need to create such driver without using simple-card.
This is very normal approach on ASoC and there are many such driver.

Best regards
Kuninori Morimoto

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