Received-SPF: pass (google.com: domain of linux-kernel+bounces-61890-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) client-ip=147.75.80.249;
Precedence: bulk
MIME-Version: 1.0
References: <20240212083426.26757-1-krzysztof.kozlowski@linaro.org>
 <CAMuHMdU-c5_Z2AMNtNH4Cc4JUrn+oKU-1CumEOAP6=5Zomcj_A@mail.gmail.com>
 <2922eece-5486-4eff-af99-f7060cb61d17@linaro.org> <20240212115837.efz73yxinkysdmgh@runtux.com>
 <e2a5b005-7916-4296-b072-c24efd4b3357@linaro.org> <20240212143957.gaxxz3nt7pxhlmqh@runtux.com>
In-Reply-To: <20240212143957.gaxxz3nt7pxhlmqh@runtux.com>
From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Mon, 12 Feb 2024 16:24:46 +0100
Message-ID: <CAMuHMdVzQb=0ZkPMWjcXzYrUjPGm_KzbtgfPN7icZzi3whPbiA@mail.gmail.com>
Subject: Re: [PATCH 1/3] dt-bindings: auxdisplay: hit, hd44780: drop redundant
 GPIO node
To: Ralf Schlatterbeck <rsc@runtux.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>, 
	Linus Walleij <linus.walleij@linaro.org>, Miguel Ojeda <ojeda@kernel.org>, 
	Rob Herring <robh+dt@kernel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, Conor Dooley <conor+dt@kernel.org>, 
	Robin van der Gracht <robin@protonic.nl>, Paul Burton <paulburton@kernel.org>, 
	linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, 
	linux-kernel@vger.kernel.org, 
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

Hi Ralf,

On Mon, Feb 12, 2024 at 3:40=E2=80=AFPM Ralf Schlatterbeck <rsc@runtux.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/c=
ommit/?h=3Dtopic/renesas-overlays&id=3D3a41e34a2dd902c7bf74d11254a561907872=
52b6

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

Only two? ;-)

Gr{oetje,eeting}s,

                        Geert

--=20
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k=
org

In personal conversations with technical people, I call myself a hacker. Bu=
t
when I'm talking to journalists I just say "programmer" or something like t=
hat.
                                -- Linus Torvalds