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

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Message-ID: <c44b4b09-8c28-5168-136f-c72c291d7b7b@st.com>
Date:   Thu, 22 Feb 2018 15:19:46 +0000
From:   Amelie DELAUNAY <amelie.delaunay@...com>
To:     Linus Walleij <linus.walleij@...aro.org>
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-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 02/22/2018 02:11 PM, Linus Walleij wrote:
> 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.
> 

This chip has a FW version. So, I agree, I should use a compatible that 
reflects this FW version.

>> +- 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.
> 

It would go with gpio/pinctrl driver, so in dt-bindings/(gpio|pinctrl).

Regards,
Amelie

>> +- 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
>