Re: [PATCH v3 4/4] ARM: dts: marvell: Indicate USB activity on x530

[Geert Uytterhoeven]

Hi Andy,

On Sun, Mar 3, 2024 at 9:43 PM Andy Shevchenko
<andy.shevchenko@xxxxxxxxx> wrote:
> On Sun, Mar 3, 2024 at 11:48 AM Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
> > On Fri, Mar 1, 2024 at 7:24 PM Andy Shevchenko <andy@xxxxxxxxxx> wrote:
> > > The problem here as I see it is the future decision on how DP should
> > > behave like.  If you put this into DT, we will to support this to the end
> > > of the platform.
> >
> > As there exist 7-seg displays (and wirings) with and without DP,
> > the 7-seg driver and DT bindings should handle both cases.  How to
> > wire/use the DP LED is up to the hardware designer / DTS writer.
>
> Right. But my personal statistics for now is: 100% has DP (out of
> about a dozen of different chip + LED combinations). What's yours?

It's indeed hard to find contemporary 7-segment LED assemblies that
lack the DP.  But they do exist[1].  There's also no guarantee that the
DP is wired.
And don't forget custom or home-built assemblies using discrete LEDs,
especially for huge displays (e.g. using one LED-strip per segment).
So IMHO it would be a bad idea to make the DP mandatory.

[1] https://www.alibaba.com/product-detail/CC-CA-188-led-display-0_60626228913.html

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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