[PATCH v1 1/8] dt-bindings: pinctrl: Add thead,th1520-pinctrl bindings

[Linus Walleij]

On Sat, Dec 16, 2023 at 2:57 PM Emil Renner Berthing
<emil.renner.berthing at canonical.com> wrote:

> > > +          thead,strong-pull-up:
> > > +            oneOf:
> > > +              - type: boolean
> > > +              - $ref: /schemas/types.yaml#/definitions/uint32
> > > +                enum: [ 0, 2100 ]
> > > +            description: Enable or disable strong 2.1kOhm pull-up.
> >
> > bias-pull-up can already specify the strength in Ohms.
>
> The strong pull up is a separate bit that can be enabled independently from the
> regular pull-up/down, so in theory you could enable both the regular pull-up
> and the strong pull-up at the same time, or even the regular poll-down and the
> strong pull-up which is probably not advised.

bias-pull-up; <- Just regular pulling up the ordinary
bias-pull-up = <100>; <- Same thing if the ordinary is 100 Ohm (figure out what
  resistance it actually is....)
bias-pull-up = <21000000>; <- strong pull up
bias-pull-up = <21000100>; <- both at the same time

> So the idea here was just to make sure that you can do eg.
>
>         thead,strong-pull-up = <0>;
>
> to make sure the bit is cleared.

No use bias-disable; for this.

Yours,
Linus Walleij