[PATCH] ASoC: nau8821: Add DMIC selections.

[SevenLee]

Mark Brown 於 2021/12/29 下午 08:45 寫道:
> On Tue, Dec 28, 2021 at 11:51:01AM +0800, Seven Lee wrote:
>> Add the following two control options:
>> 1. DMIC pin slew rate selection.
>> 2. DMIC clock speed selection.
> The clock speed seems sensible enough to control from userspace since
> it's going to be a power/performance tradeoff but why also expose the
> slew rate to userspace - that seems more like something that would come
> from the board design?

Because customers need to adjust different DMIC materials by themselves.
Adjust which slope is the most suitable according to the conditions of
use, and
improve electromagnetic interference by setting the slew rate so that
customers
can try the best solution.

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