linux-kernel - Re: [PATCH 1/3] dt-bindings: auxdisplay: hit, hd44780: drop redundant GPIO node

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Message-ID: <CAMuHMdVzQb=0ZkPMWjcXzYrUjPGm_KzbtgfPN7icZzi3whPbiA@mail.gmail.com>
Date: Mon, 12 Feb 2024 16:24:46 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Ralf Schlatterbeck <rsc@...tux.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, 
	Linus Walleij <linus.walleij@...aro.org>, Miguel Ojeda <ojeda@...nel.org>, 
	Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Robin van der Gracht <robin@...tonic.nl>, Paul Burton <paulburton@...nel.org>, 
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, 
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH 1/3] dt-bindings: auxdisplay: hit, hd44780: drop redundant
 GPIO node

Hi Ralf,

On Mon, Feb 12, 2024 at 3:40 PM Ralf Schlatterbeck <rsc@...tux.com> wrote:
> On Mon, Feb 12, 2024 at 02:38:27PM +0100, Krzysztof Kozlowski wrote:
> > On 12/02/2024 12:58, Ralf Schlatterbeck wrote:
> > GPIO expanders and their usage is nothing specific to this device -
> > other devices also might benefit of them. Or the SoCs which have enough
> > of GPIOs... I really do not understand why do we need expander here and
> > how does it help
>
> Can we then at least link the I/O Expander example to the docs of that
> display?
> I've documented my experience here:
> https://blog.runtux.com/posts/2021/01/06/

Any chance you can update the DT overlays to use sugar syntax instead
of raw fragments, target{,-path} properties, and __overlay__ subnodes?

You can find examples in my DT overlay collection, e.g.
https://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git/commit/?h=topic/renesas-overlays&id=3a41e34a2dd902c7bf74d11254a56190787252b6

> And at the time there were two out-of-tree implementations.

Only two? ;-)

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