linux-kernel - Re: [PATCH v2 0/3] gpio: 74HC595 / 74x164 shift register improvements

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Message-ID: <CAMRc=McAm3A1movK-8q67UbKuPb8FQzVwD_me7Q6x-gei2PA_A@mail.gmail.com>
Date: Mon, 6 Jan 2025 21:16:27 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Linus Walleij <linus.walleij@...aro.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Maxime Ripard <mripard@...nel.org>, J. Neuschäfer <j.ne@...teo.net>, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>, linux-gpio@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Mark Brown <broonie@...nel.org>, linux-spi <linux-spi@...r.kernel.org>
Subject: Re: [PATCH v2 0/3] gpio: 74HC595 / 74x164 shift register improvements

On Mon, Jan 6, 2025 at 10:19 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Bartosz,
>
> CC spi
>
> On Fri, Jan 3, 2025 at 9:33 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> > From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> >
> > On Tue, 24 Dec 2024 09:02:09 +0100, J. Neuschäfer wrote:
> > > This patchset adds a compatible string for another part, and clarifies
> > > the role of the latch clock pin on 74x164-compatible shift registers.
> >
> > Applied, thanks!
> >
> > [1/3] dt-bindings: gpio: fairchild,74hc595: Add On Semi MC74HC595A compat
> >       commit: 0ba6cec7acbb666d28998780683deb83a3e677e3
> > [2/3] gpio: 74x164: Add On Semi MC74HC595A compat
> >       commit: b1468db9d865deb5271c9a20d05201b1c0636895
>
> Do we really need to document and add driver support for all variants?
> I can easily come up with a list of tens or perhaps even hundreds
> of xx74yy595z parts that are all compatible, as far as software is
> concerned.  As SPI was invented by Motorola, the original part is
> probably named MC74595 or MC74LS595 (yes, ON Semiconductor bought the
> logic division of Motorola).
>
> Perhaps we need a separate vendor prefix for the 74xx-series[1]?
> The xx-prefix and z-suffix don't matter; the yy-infix for semiconductor
> technology rarely matters (there are a few exceptions, though, mostly
> pinout, which doesn't matter for software).
>

I missed the fact that Rob actually responded to patch 1/3 with a
similar suggestion (fallback, instead of a full compatible).

I can drop this series from my queue if it needs more rework.

Bartosz