[alsa-devel] [PATCH 1/4] ASoC: rockchip: add rockchip machine driver

[Dylan Reid]

On Wed, May 13, 2015 at 9:42 AM, Mark Brown <broonie at kernel.org> wrote:
> On Wed, May 13, 2015 at 09:23:01PM +0800, zhengxing wrote:
>> On 2015年05月13日 03:22, Mark Brown wrote:
>
>> >Is it not possible to extend simple card to handle your use cases?
>> >Given the very generic naming and the fact that things like jack
>> >detection and so on should depend on the CODEC and board usually rather
>> >than on the SoC it doesn't sound like this is Rockchip specific.
>
>> >This also looks like you're reimplementing some device model enumeration
>> >stuff which probably shouldn't be happening but let's understand the
>> >problem you're trying to solve here before going too far into the code.
>
>> Because we are trying to bring rt5650 in the project, so we intend to
>> describe supported codecs with DTS via only a rockchip machine driver file,
>> others remain pre-implement(like max98090 / rt5645 that vendor machine
>> driver).
>
> I don't undertand what you're saying here, sorry - why is this not just
> a case of writing multiple machine drivers?

I don't understand this either.  I'd think the best solution is
simple-card, configured through DTS for each device.

>
>> I communicated with Dylan, and he told me that the jack detection is an
>> issue in the simple-card, and suggested we are better to send them at
>> present.
>
> But what are these issues?

The issue I was referring to when I spoke with rock chip was the need
to pass the jack simple-card creates to the headset chip or codec.  We
need a way to specify a device like a tsa227e or rt5650 to pass the
jack to, which events are supported by the jack, and a generic API for
passing the jack.