linux-kernel - Re: [EXT] Re: [PATCH] dt-bindings: spi: Convert Freescale DSPI to json schema

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Date:   Wed, 24 Mar 2021 12:14:03 -0600
From:   Rob Herring <robh@...nel.org>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Kuldeep Singh <kuldeep.singh@....com>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>
Subject: Re: [EXT] Re: [PATCH] dt-bindings: spi: Convert Freescale DSPI to
 json schema

On Tue, Mar 16, 2021 at 12:15:06PM +0200, Vladimir Oltean wrote:
> On Tue, Mar 16, 2021 at 06:08:17AM +0000, Kuldeep Singh wrote:
> > Compatible entries in conjugation require enum and const pair.
> > For example, ls1012a.dtsi uses compatible = "fsl,ls1012a-dspi","fsl,ls1021a-v1.0-dspi";
> > Same goes for LS1028 as well.
> > 
> > Therefore, can't mention the compatible entry as single entity otherwise
> > it may fail "make dt_binding_check" and "make dtbs_check".
> > 
> > > 
> > > > +examples:
> > > > +  - |
> > > > +    #include <dt-bindings/clock/fsl,qoriq-clockgen.h>
> > > > +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> > > > +
> > > > +    soc {
> > > > +        #address-cells = <2>;
> > > > +        #size-cells = <2>;
> > > > +
> > > > +        spi@...0000 {
> > > > +            compatible = "fsl,ls1028a-dspi", "fsl,ls1021a-v1.0-dspi";
> > > 
> > > This doesn't need the "fsl,ls1021a-v1.0-dspi" compatible, can you please remove
> > > it?
> > 
> > I have taken this example from LS1028a.dtsi and it uses these compatibles in conjugation.
> > If "fsl,ls1021a-v1.0-dspi" is not required, then it should also be removed from device-tree
> > As well as from bindings both.
> 
> Yes, the second compatible is never required by the driver and should be
> removed from existing device trees if that makes "make dtbs_check" fail.

Can you say that is true for every possible driver implementation? 
u-boot, *BSD, etc.?

Rob