[alsa-devel] [Uclinux-dist-devel] [PATCH 1/4] extend ad1938 codec driver to ad193x supporting ad1936/7/8/9

Barry Song 21cnbao at gmail.com
Fri Mar 19 08:07:33 CET 2010

It seems "git-format-patch -M" fails to detect this patch as a
rename(maybe due to too many changed lines?), so I commit two times to
get a readable patch and attach them.
1. rename ad1938 to ad193x
2. extend ad1938 codec driver to ad193x supporting ad1936/7/8/9

On Fri, Mar 19, 2010 at 11:30 AM, Barry Song <21cnbao at gmail.com> wrote:
> I think this issue has nothing to do with subsystems, anyway, both are
> acceptable to me. Since there has been an example in ASoC, I will
> follow it and send v2.
> thanks
> -barry
> On Fri, Mar 19, 2010 at 2:08 AM, Mike Frysinger <vapier.adi at gmail.com> wrote:
>> On Thu, Mar 18, 2010 at 14:05, Mark Brown wrote:
>>> On Thu, Mar 18, 2010 at 01:17:11PM -0400, Mike Frysinger wrote:
>>>> > The subsystem dependency here come from the fact that ASoC has machine
>>>> > drivers and relies on them selecting the CODEC drivers to get them built
>>>> > in the first place so if you're trying to change something like this
>>>> > you'll most likely not only have to rebuild your kernel but also have to
>>>> > write code.  This isn't something that the input layer has (input layer
>>>> > drivers are pretty much standalone, usually only need platform data
>>>> > for any per machine hookup and for I2C and SPI can even be registered
>>>> > from user space IIRC) and it changes the considerations noticably.
>>>> the machine driver selects the codec, it doesnt select the bus.  the
>>>> codec worries about that.  so i dont quite follow the logic here.
>>> That's not the case, CODEC drivers do absolutely nothing to ensure that
>>> they have the buses they need.  Multi bus CODECs should all be perfectly
>>> happy to build with no bus at all, though sparse and/or GCC will warn.
>>> Kconfig will cheerfully ignore any dependencies of things that are
>>> selected - unless it's been updated recently all a select does is force
>>> the selected symbol on, it doesn't recurse through dependencies and
>>> selects of that symbol.  Besides, multi bus CODEC drivers can't know
>>> which of their possible buses are actually needed on a given system -
>>> they just build support for any bus types that are configured and let
>>> something else worry about the resulting configuration actually being
>>> useful.
>> sure, on the Kconfig side, i can see that.  i was thinking the pure C
>> drivers though.  thanks for the clarification.
>> -mike
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