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

Andy Shevchenko
2024-02-29T10:42:57Z

On Thu, Feb 29, 2024 at 10:23:15AM +0100, Geert Uytterhoeven wrote:
> On Wed, Feb 28, 2024 at 3:58 PM Andy Shevchenko
> <andy.shevchenko@gmail.com> wrote:
> > On Wed, Feb 28, 2024 at 4:04 PM Rob Herring <robh@kernel.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.

Right, I meant the sequence in the array of GPIOs in the DT.
I implied that it maps 1:1 to the real bits in HW (in some cases).

--
With Best Regards,
Andy Shevchenko