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From:   Linus Walleij <linus.walleij@linaro.org>
Date:   Thu, 22 Feb 2018 14:54:31 +0100
Message-ID: <CACRpkdZFrRXEBW6KnqZ=h_7BxYn-RaAzhP4ovwC_DQSbAGZCVw@mail.gmail.com>
Subject: Re: [PATCH 4/6] ARM: dts: stm32: add MFX support on I2C1 on stm32746g-eval
To:     Amelie Delaunay <amelie.delaunay@st.com>
Cc:     Lee Jones <lee.jones@linaro.org>, Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Russell King <linux@armlinux.org.uk>,
        Alexandre Torgue <alexandre.torgue@st.com>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        linux-gpio@vger.kernel.org,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>
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On Thu, Feb 8, 2018 at 3:27 PM, Amelie Delaunay <amelie.delaunay@st.com> wrote:

> MFX is used as gpio expander on stm32746g-eval.
>
> Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>

(...)
> +       mfx: mfx@42 {
> +               compatible = "st,mfx";
> +               reg = <0x42>;
> +               interrupts = <8 1>;
> +               interrupt-parent = <&gpioi>;
> +               interrupt-controller;
> +               #interrupt-cells = <1>;
> +
> +               mfxgpio: mfx_gpio {
> +                       compatible = "st,mfx-gpio";
> +                       interrupts = <0>;
> +                       interrupt-parent = <&mfx>;
> +                       gpio-controller;
> +                       #gpio-cells = <2>;

So I think this node should contain some pin config states
that can  be referenced by the drivers to set up push/pull
etc. Probably it can use just standard pin config properties
like sx150x.

Yours,
Linus Walleij