linux-kernel - Re: [PATCH v2 3/3] dt-bindings: iio: accel: add dt-binding schema for msa311 accel driver

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Message-ID: <20220602174013.x4ygdpbivr2xv5iq@CAB-WSD-L081021.sigma.sbrf.ru>
Date:   Thu, 2 Jun 2022 17:39:55 +0000
From:   Dmitry Rokosov <DDRokosov@...rdevices.ru>
To:     Jonathan Cameron <jic23@...nel.org>
CC:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        kernel <kernel@...rdevices.ru>,
        "stano.jakubek@...il.com" <stano.jakubek@...il.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "andy.shevchenko@...il.com" <andy.shevchenko@...il.com>,
        "stephan@...hold.net" <stephan@...hold.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] dt-bindings: iio: accel: add dt-binding schema for
 msa311 accel driver

Jonathan,

On Sat, May 28, 2022 at 06:43:37PM +0100, Jonathan Cameron wrote:
> On Wed, 25 May 2022 18:32:45 +0000
> Dmitry Rokosov <DDRokosov@...rdevices.ru> wrote:
> 
> > > +  interrupt-names:
> > > +    const: irq  
> > I stay interrupt-names node here, because otherwise dt_binding_check
> > command shows such a warning:
> > 
> > ====
> >   CHECK   Documentation/devicetree/bindings/iio/accel/memsensing,msa311.example.dt.yaml
> > Documentation/devicetree/bindings/iio/accel/memsensing,msa311.example.dt.yaml: accelerometer@62: 'interrupt-names' does not match any of the regexes: 'pinctrl-[0-9]+'
> > ====
> > 
> > I can't delete this node from the example as well, because it's required for
> > msa311 dts i2c irq declaration.
> 
> Sorry, you've lost me - what breaks if you drop it from the example?
> I'd expect to see no interrupt-names being documented or in the example.
> 
> > 
> > Please help me to resolve this problem properly if possible. If we can
> > ignore such warning I'll delete interrupt-names in the next patchset's
> > version.
> 
> We can't ignore the warning, so this comes down to what am I missing with
> the need for it in the example...
> 

You are totally right. I thought during i2c device probe we should
provide interrupt-names dts property because i2c irq parsing requires
it, but I was wrong. i2c_device_probe() function tries to parse irq
value using interrupt-names property and fallbacks to simple
of_irq_get() if interrupt-names property is missing. In other words,
interrupt-names property is not required for device node declaration, so
it can be removed from documentation. Thank you for pointing this out.

> > 
> > > +examples:
> > > +  - |
> > > +    #include <dt-bindings/interrupt-controller/irq.h>
> > > +    i2c {
> > > +        #address-cells = <1>;
> > > +        #size-cells = <0>;
> > > +  
> > Properties #address-cells and #size-cells are still located in the
> > schema example, because otherwise dt_binding_check raises the below 
> > warnings if we delete these properties:
> 
> They should be there for the i2c node, (as they are required for an i2c bus master
> node) but you had them documented as being in the msa311 node.  If it's
> not in the
> accelerometer@62 {
> 
> }
> 
> section of the example documetnation doesn't belong on this file (it will be
> elsewhere). 
> 
> The request is to drop the documentation of them (as we are documenting
> the msa311 part of the binding only).  They should indeed still be there
> in the example.
> 
> Jonathan
> 

I've removed #address-cells and #size-cells properties from
doc section as well as interrupt-names. All dtbs checkings have passed
successfully. Thank you!

-- 
Thank you,
Dmitry