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References: <20210430123511.116057-1-robert.marko@sartura.hr> <af4923ef1ed0693fcd67d7986348b164@walle.cc>
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From:   Robert Marko <robert.marko@sartura.hr>
Date:   Wed, 19 May 2021 13:53:25 +0200
Message-ID: <CA+HBbNHCnpg9qCzZbT9KVNqX-daC68iaJKNdyEf7do3w98miWw@mail.gmail.com>
Subject: Re: [PATCH 1/6] mfd: Add Delta TN48M CPLD driver
To:     Michael Walle <michael@walle.cc>
Cc:     Lee Jones <lee.jones@linaro.org>, robh+dt@kernel.org,
        Linus Walleij <linus.walleij@linaro.org>,
        bgolaszewski@baylibre.com, jdelvare@suse.com,
        Guenter Roeck <linux@roeck-us.net>, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org,
        linux-hwmon@vger.kernel.org, Luka Perkov <luka.perkov@sartura.hr>,
        jmp@epiphyte.org, Paul Menzel <pmenzel@molgen.mpg.de>,
        Donald Buczek <buczek@molgen.mpg.de>
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On Thu, May 6, 2021 at 6:34 PM Michael Walle <michael@walle.cc> wrote:
>
> Hi Robert,
>
> Am 2021-04-30 14:35, schrieb Robert Marko:
> > Delta TN48M switches have a Lattice CPLD that serves
> > multiple purposes including being a GPIO expander.
> > So lets add the MFD core driver for it.
>
> Did you have a look at mfd/simple-mfd-i2c.c?

Hi Michael,

Yes, that was my first idea but we have a requirement to expose CPLD
information via debugfs as there are userspace applications using it.
And simple-mfd-i2c does not allow us to do so.

Regards,
Robert
>
> -michael


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