linux-kernel - Re: [PATCH v2 1/2] [RFT] dt-bindings: leds: Add cznic,turris1x-leds.yaml binding

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Date:   Wed, 6 Jul 2022 17:27:32 +0200
From:   Marek Behún <kabel@...nel.org>
To:     Pali Rohár <pali@...nel.org>
Cc:     Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] [RFT] dt-bindings: leds: Add
 cznic,turris1x-leds.yaml binding

On Wed, 6 Jul 2022 13:19:12 +0200
Pali Rohár <pali@...nel.org> wrote:

> On Wednesday 06 July 2022 13:15:07 Marek Behún wrote:
> > On Tue,  5 Jul 2022 17:59:28 +0200
> > Pali Rohár <pali@...nel.org> wrote:
> >   
> > > +examples:
> > > +  - |
> > > +    #include <dt-bindings/leds/common.h>
> > > +
> > > +    cpld@3,0 {  
> > 
> > The generic node name should be just "bus". That it is a CPLD
> > implementation should come from compatible string.  
> 
> Sorry, I do not understand why "bus". Why other memory chips are named
> e.g. "nand" or "nor" and not "bus" too?

As far as I understand this is because that is the preferred name for
busses and this is a bus, since there is also the simple-bus compatible.

> By this logic should not be _every_ node called just "bus"? Hm... and 
> are names needed at all then?

:-)

The schema
  https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/simple-bus.yaml
allows for different names (soc|axi|ahb|*-bus) to avoid warnings on
existing old dts files.

The preferred way is to not have the implementation in nodename,
similar to how we use 'switch' instead of 'mv88e6xxx', or
'ethernet-phy' instead of 'mv88e151x', or 'led-controller', ...

I wasn't there when people started requesting for this to be that way,
but I guess it makes some sense to make it more readable and less
redundant (the generic name in nodename and the implementation in
compatible string...).

Marek