linux-kernel - Re: [PATCH 3/6] gpio: Add Delta TN48M CPLD GPIO driver

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Date:   Fri, 21 May 2021 15:21:06 +0200
From:   Robert Marko <robert.marko@...tura.hr>
To:     Michael Walle <michael@...le.cc>
Cc:     Lee Jones <lee.jones@...aro.org>, robh+dt@...nel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        bgolaszewski@...libre.com, jdelvare@...e.com,
        Guenter Roeck <linux@...ck-us.net>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-hwmon@...r.kernel.org, Luka Perkov <luka.perkov@...tura.hr>,
        jmp@...phyte.org, Paul Menzel <pmenzel@...gen.mpg.de>,
        Donald Buczek <buczek@...gen.mpg.de>
Subject: Re: [PATCH 3/6] gpio: Add Delta TN48M CPLD GPIO driver

On Thu, May 6, 2021 at 6:38 PM Michael Walle <michael@...le.cc> wrote:
>
> Am 2021-04-30 14:35, schrieb Robert Marko:
> > Delta TN48M CPLD is used as a GPIO expander for the SFP GPIOs.
> >
> > It is a mix of input only and output only pins.
> >
> > Since there is no logical GPIO numbering arbitrary one is used
> > along dt-bindings to make it humanly readable.
>
> Can gpio/gpio-regmap.c be used here? See gpio/gpio-sl28cpld.c
> for an example.

I suppose it can be used, I need to look into it more to see how could
translation to register and mask be done with it.

I have adapted the driver to work with simple I2C MFD so far.

It still leaves me with a finding the logical way to number the GPIO-s.

Robert
>
> -michael



--
Robert Marko
Staff Embedded Linux Engineer
Sartura Ltd.
Lendavska ulica 16a
10000 Zagreb, Croatia
Email: robert.marko@...tura.hr
Web: www.sartura.hr