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

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Message-ID: <CAMuHMdXjqVQeQF6TFr1nQmUCLrEbY1gq5OdCcz6T60W33QO2-Q@mail.gmail.com>
Date: Mon, 4 Mar 2024 10:57:18 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: Andy Shevchenko <andy@...nel.org>, Chris Packham <chris.packham@...iedtelesis.co.nz>, 
	robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, 
	andrew@...n.ch, gregory.clement@...tlin.com, sebastian.hesselbarth@...il.com, 
	pavel@....cz, lee@...nel.org, linux-leds@...r.kernel.org, 
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 4/4] ARM: dts: marvell: Indicate USB activity on x530

Hi Andy,

On Sun, Mar 3, 2024 at 9:43 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> On Sun, Mar 3, 2024 at 11:48 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > On Fri, Mar 1, 2024 at 7:24 PM Andy Shevchenko <andy@...nel.org> 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@...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