linux-kernel - Re: [PATCH 04/15] dt_bindings: bd71828: Add clock output mode

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Date:   Wed, 13 Jan 2021 09:52:41 -0600
From:   Rob Herring <robh@...nel.org>
To:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-power <linux-power@...rohmeurope.com>,
        linux-clk <linux-clk@...r.kernel.org>
Subject: Re: [PATCH 04/15] dt_bindings: bd71828: Add clock output mode

On Wed, Jan 13, 2021 at 8:52 AM Matti Vaittinen
<matti.vaittinen@...rohmeurope.com> wrote:
>
>
> On Wed, 2021-01-13 at 07:52 -0600, Rob Herring wrote:
> > On Fri, Jan 08, 2021 at 03:34:16PM +0200, Matti Vaittinen wrote:
> > > The BD71828 allows configuring the clk32kout pin mode to CMOS or
> > > open-drain. Add device-tree property for specifying the preferred
> > > mode.
> > >
> > > Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
> > > ---
> > >  .../devicetree/bindings/mfd/rohm,bd71828-pmic.yaml         | 7
> > > +++++++
> > >  1 file changed, 7 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/mfd/rohm,bd71828-
> > > pmic.yaml b/Documentation/devicetree/bindings/mfd/rohm,bd71828-
> > > pmic.yaml
> > > index 3a6a1a26e2b3..cba085836bc0 100644
> > > --- a/Documentation/devicetree/bindings/mfd/rohm,bd71828-pmic.yaml
> > > +++ b/Documentation/devicetree/bindings/mfd/rohm,bd71828-pmic.yaml
> > > @@ -44,6 +44,13 @@ properties:
> > >    clock-output-names:
> > >      const: bd71828-32k-out
> > >
> > > +  rohm,clkout-mode:
> > > +    description: clk32kout mode. Can be set to "open-drain" or
> > > "cmos".
> > > +    $ref: "/schemas/types.yaml#/definitions/string"
> > > +    enum:
> > > +      - open-drain
> > > +      - cmos
> > > +
> >
> > I think a boolean or tristate ((0/1/not present) if you need 'leave
> > default') would be better.
>
> I was thinking of boolean but I hit the exact problem of leaving the
> default. (Booleans are so tempting for a lazy coder like me :] ) Do you
> mean uint with allowed values of 0/1 with the tristated?

Yes.

> I can sure do
> that - but wouldn't open-drain / cmos be more descriptive?

You'd get at least half by naming it 'rohm,clkout-open-drain'. I think
anyone that knows what open-drain means will know what !open-drain
implies.

Rob