[PATCH v2 3/6] pinctrl: add optional .release_mux() callback

[Linus Walleij]

On Thu, Feb 26, 2026 at 12:55 AM Frank Li <Frank.Li at nxp.com> wrote:

> Add an optional .release_mux() callback to the pinmux_ops.
>
> Some devices require releasing resources that were previously acquired in
> .set_mux(). Providing a dedicated .release_mux() callback allows drivers to
> properly clean up hardware state or associated resources when a mux
> function is no longer active.
>
> The callback is optional and does not affect existing drivers.
>
> Signed-off-by: Frank Li <Frank.Li at nxp.com>

Can you explain why you need this custom code for this?

Nominally pin control defines and puts the hardware into a
number of states such as:
"default"
"idle"
"sleep"
"init"

Usually (at least for silicon) what .release_mux() would to
is semantically equivalent to a transition into the "init" or
"sleep" state. And if these are not descriptive enough you can
even define a "released" state.

Is it not possible to reach the set-up of the hardware that you
are desiring by just defining such a relaxed state?

Yours,
Linus Walleij