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

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Message-ID: <Yt59XSTaJUvThJli@gmail.com>
Date:   Mon, 25 Jul 2022 13:24:13 +0200
From:   Marcus Folkesson <marcus.folkesson@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...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 11:32:16AM +0200, Andy Shevchenko 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?

You're right, I didn't think of that CS could be used for this.
The additional compatible strings is then superfluous, so I will skip those.

> 
> 
> -- 
> With Best Regards,
> Andy Shevchenko

Best regards
Marcus Folkesson

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