linux-kernel - Re: [PATCH 1/2] gpio: gpio-74x164: add support for CDx4HC4094

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Date:   Mon, 25 Jul 2022 11:34:43 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Marcus Folkesson <marcus.folkesson@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Maxime Ripard <mripard@...nel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] gpio: gpio-74x164: add support for CDx4HC4094

On Mon, Jul 25, 2022 at 11:32 AM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
>
> On Thu, Jul 21, 2022 at 11:32 AM Marcus Folkesson
> <marcus.folkesson@...il.com> wrote:
> >
> > 74hc4094 and 75hc4094 works similar to 74x164 but has an additional
> > storage latch associated with each stage for strobing data from the
> > serial input to parallell buffer tri-state output.
>
> parallel
>
> > Add support for an optional strobe pin.
>
> Sorry for my absence of understanding, but why?
> SPI has MOSI, CLK, CS, where the last one is exactly for that. No?

I have a 595 register which also has a latch. What I expect to see in
this series is just a compatible string addition (but again, why even
that is needed?).


-- 
With Best Regards,
Andy Shevchenko