> > +       pins_gpio2b: pins-gpio2b {
> 
> pins-cn12?

Okay.

> > +               pinmux = <RZN1_PINMUX(164, RZN1_FUNC_GPIO)>,
> > +                        <RZN1_PINMUX(165, RZN1_FUNC_GPIO)>,
> > +                        <RZN1_PINMUX(166, RZN1_FUNC_GPIO)>,
> > +                        <RZN1_PINMUX(167, RZN1_FUNC_GPIO)>,
> > +                        <RZN1_PINMUX(168, RZN1_FUNC_GPIO)>,
> > +                        <RZN1_PINMUX(169, RZN1_FUNC_GPIO)>;
> > +               drive-strength = <6>;
> > +               bias-disable;
> 
> These pins don't have any external pull-ups, so disabling bias will
> make them pick-up random EM noise when left unconnected.

Can fix, but is this bad? I'd assume the connected pins will handle it.
And if not, the DT needs to be adapted to that use case. Otherwise, a
default pull-up needs to be disabled for another use case.