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

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Date: Mon, 12 Feb 2024 15:39:58 +0100
From: Ralf Schlatterbeck <rsc@...tux.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Geert Uytterhoeven <geert@...ux-m68k.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

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/

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

Note that I think that redundancy in code is bad.
Not so for documentation.

Thanks + kind regards
Ralf
-- 
Dr. Ralf Schlatterbeck                  Tel:   +43/2243/26465-16
Open Source Consulting                  www:   www.runtux.com
Reichergasse 131, A-3411 Weidling       email: office@...tux.com