linux-kernel - Re: [PATCH 1/6] dt-bindings: mfd: Add ST Multi-Function eXpander driver

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Message-ID: <CACRpkdZxJhntgHwgsg=P98i0aGnXSQ2rXO16H0U=cJ+sBbF27g@mail.gmail.com>
Date:   Thu, 22 Feb 2018 14:11:26 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Amelie Delaunay <amelie.delaunay@...com>
Cc:     Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        linux-gpio@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/6] dt-bindings: mfd: Add ST Multi-Function eXpander driver

On Thu, Feb 8, 2018 at 3:27 PM, Amelie Delaunay <amelie.delaunay@...com> wrote:

> +Required properties:
> +- compatible: must be "st,mfx"

I bet this should be more specific. Tomorrow there will be a new
version of this expander and then we will wish that we used
a more specific compatible for the first one.

Does this chip have any kind of product number on it?

Else I would be tempted to use the compatible "st,mfx-0000"
or something, indicating it is the first of its kind.

> +- reg: I2C address of the device
> +- interrupts: interrupt triggered by MFX_IRQ_OUT signal
> +- interrupt-parent: interrupt controller MFX is connected to
> +- interrupt-controller: marks the device as an interrupt controller
> +- #interrupt-cells: should be <1>, index of the interrupt within the
> +  controller, in accordance with the "one cell" variant of
> +  <devicetree/bindings/interrupt-controller/interrupt.txt>

Seems fine.

> +Optional nodes:
> +
> +* GPIO eXpander
> +MFX provides 16 programmable GPIOs, and it is also possible to recover 8
> +alternate GPIOs if the main functions are not used (touchscreen controller and
> +IDD measurement not enabled).

Apparenly Rob thinks this should go elsewhere.

> +- gpio-controller: marks the device node as a GPIO controller
> +- #gpio-cells: should be <2>, the first cell is the GPIO offset on this GPIO
> +  controller, the second cell is the gpio flags in accordance with
> +  <dt-bindings/gpio/st-mfx-gpio.h>.

Let's discuss these extra GPIO flag bindings separately.

Yours,
Linus Walleij