Re: [PATCH v1 2/2] ASoC: codecs: wsa883x: Handle shared reset GPIO for WSA883x speakers

[Philipp Zabel]

On Fr, 2025-06-20 at 21:35 +0300, Dmitry Baryshkov wrote:
> On 20/06/2025 13:30, Mohammad Rafi Shaik wrote:
> > On some Qualcomm platforms, such as QCS6490-RB3Gen2 and QCM6490-IDP,
> > multiple WSA8830/WSA8835 speakers share a common reset (shutdown) GPIO.
> > To handle such cases, use the reset controller framework along with the
> > "reset-gpio" driver.
> 
> How does this handle the fact that resetting one codec will also 
> silently reset another one?

It's the other way around. Since shared reset controls have a common
deassertion refcount, actual reset assertion only happens once
reset_control_assert() has been called on all shared reset controls
[1]. The speakers would only be put back into reset once the last one
is unbound.

[1] https://docs.kernel.org/driver-api/reset.html#shared-and-exclusive-resets

regards
Philipp