linux-kernel - Re: [PATCH v2 2/4] dt-bindings: auxdisplay: Add bindings for generic 7 segment LED

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Message-ID: <CAMuHMdWgytkANQ19=pSfG7Jpddo7Htgp2P=p7EAVmpWYuGPmCg@mail.gmail.com>
Date: Thu, 29 Feb 2024 10:23:15 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: Rob Herring <robh@...nel.org>, Chris Packham <chris.packham@...iedtelesis.co.nz>, andy@...nel.org, 
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, andrew@...n.ch, 
	gregory.clement@...tlin.com, sebastian.hesselbarth@...il.com, 
	ojeda@...nel.org, tzimmermann@...e.de, javierm@...hat.com, robin@...tonic.nl, 
	lee@...nel.org, pavel@....cz, devicetree@...r.kernel.org, 
	linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 2/4] dt-bindings: auxdisplay: Add bindings for generic
 7 segment LED

Hi Andy,

On Wed, Feb 28, 2024 at 3:58 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> On Wed, Feb 28, 2024 at 4:04 PM Rob Herring <robh@...nel.org> wrote:
> > On Wed, Feb 28, 2024 at 10:22:42AM +1300, Chris Packham wrote:
>
> ...
>
> > > +  segment-gpios:
> > > +    description:
> > > +      An array of GPIOs one per segment.
> > > +    minItems: 7
> >
> > How does one know which GPIO is which segment?
>
> I believe we need just to agree on this. Since anybody can shuffle
> GPIOs in the DT, there is no need to support arbitrary orders. And
> naturally 'a' is bit 0, 'g' is bit 6, 'dp' bit 7 if present.

Note that there are no bits involved at this level, only GPIO specifiers.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68korg

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds