linux-kernel - Re: [PATCH] dt-bindings: pinctrl: intel: Update to use generic bindings

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Message-ID: <CACRpkdZZYVXQ5MpStaWnYrV-L9wJGFqLm4ohuEJ=du9W=-Z5hQ@mail.gmail.com>
Date:   Mon, 13 Jan 2020 22:25:20 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Rahul Tanwar <rahul.tanwar@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        yixin zhu <yixin.zhu@...ux.intel.com>, qi-ming.wu@...el.com,
        cheol.yong.kim@...el.com
Subject: Re: [PATCH] dt-bindings: pinctrl: intel: Update to use generic bindings

On Mon, Jan 13, 2020 at 6:38 PM Rob Herring <robh+dt@...nel.org> wrote:

> > +$id: http://devicetree.org/schemas/bindings/pinctrl/intel,lgm-io.yaml#
>
> Drop 'bindings' from the path.

I fixed this.

> > +allOf:
> > +  - $ref: pincfg-node.yaml#
> > +  - $ref: pinmux-node.yaml#
>
> This 'allOf' is at the wrong level...
(...)
> > +# Client device subnode's properties
> > +patternProperties:
> > +  '-pins$':
> > +    type: object
>
> ...It should be here.

I moved this.

> > +    properties:
> > +      function: true
> > +      group: true

This should have both groups and group.

> > +      pins: true
> > +      pinmux: true
> > +      bias-pull-up: true
> > +      bias-pull-down: true
> > +      drive-strength: true
> > +      slew-rate: true
> > +      drive-open-drain: true
> > +      output-enable: true
> > +
> > +    required:
> > +      - function
> > +      - group

This should have groups as compulsory.

> > +        uart0-pins {
> > +             pins = <64>, /* UART_RX0 */
> > +                    <65>; /* UART_TX0 */
> > +             function = "CONSOLE_UART0";
> > +             pinmux = <1>,
> > +                      <1>;
> > +             groups = "CONSOLE_UART0";
>
> 'groups' is not a defined property. Should be 'group'.

Actually not in this case.

There was an error in commit 3af50e548019f6ee26d0ed4340f4ab980f884696
"dt-bindings: pinctrl: Convert generic pin mux and config properties to schema"

A function has a 1-to-many relationship to groups so it should be "groups"
for the multiplexing (pluralis).

A pin config on the other hand, such as "set slewrate for all the pins in
this pin group" has a 1-to-1 relationship to a group (singularis).

I am trying to fix it all up in one patch.

Yours,
Linus Walleij