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Date:   Tue, 19 Oct 2021 04:05:34 +0200
From:   Andrew Lunn <andrew@lunn.ch>
To:     Robert Marko <robert.marko@sartura.hr>
Cc:     Rob Herring <robh@kernel.org>,
        Linus Walleij <linus.walleij@linaro.org>,
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        Lee Jones <lee.jones@linaro.org>,
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        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
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        Paul Menzel <pmenzel@molgen.mpg.de>,
        Donald Buczek <buczek@molgen.mpg.de>
Subject: Re: [PATCH v6 5/6] dt-bindings: mfd: Add Delta TN48M CPLD drivers
 bindings
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> > > > +  GPIO controller module provides GPIO-s for the SFP slots.
> > > > +  It is split into 3 controllers, one output only for the SFP TX disable
> > > > +  pins, one input only for the SFP present pins and one input only for
> > > > +  the SFP LOS pins.

Late to the conversation, so i might be asking questions already
asked...

So the PLD has restrictions? You have a collection of GPOs and a
collection of GPIs? You don't have an GPIOs?

> > > > +
> > > > +properties:
> > > > +  compatible:
> > > > +    enum:
> > > > +      - delta,tn48m-gpio-sfp-tx-disable
> > > > +      - delta,tn48m-gpio-sfp-present
> > > > +      - delta,tn48m-gpio-sfp-los

Do these names have any real significant? Are you really forced to
connect the SFP cage in this dedicated manor? Is there any reason why
i cannot use a GPO to control an LED? A GPI for a button?

	Andrew