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

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Message-ID: <CACRpkdYT+jf4=dk3Y9cwa_=aYCihVq93N-iT0RUbtT2-+PX69w@mail.gmail.com>
Date: Wed, 20 Dec 2023 20:24:58 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Emil Renner Berthing <emil.renner.berthing@...onical.com>
Cc: Rob Herring <robh@...nel.org>, linux-gpio@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org, 
	Hoan Tran <hoan@...amperecomputing.com>, Serge Semin <fancer.lancer@...il.com>, 
	Bartosz Golaszewski <brgl@...ev.pl>, Andy Shevchenko <andy@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Jisheng Zhang <jszhang@...nel.org>, Guo Ren <guoren@...nel.org>, Fu Wei <wefu@...hat.com>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>
Subject: Re: [PATCH v1 1/8] dt-bindings: pinctrl: Add thead,th1520-pinctrl bindings

On Sat, Dec 16, 2023 at 2:57 PM Emil Renner Berthing
<emil.renner.berthing@...onical.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