linux-kernel - Re: [PATCH] spi: dt-bindings: Move 'rx-sample-delay-ns' to spi-peripheral-props.yaml

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Date:   Tue, 31 May 2022 10:10:30 -0500
From:   Rob Herring <robh@...nel.org>
To:     Serge Semin <fancer.lancer@...il.com>
Cc:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Pratyush Yadav <p.yadav@...com>,
        Mark Brown <broonie@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] spi: dt-bindings: Move 'rx-sample-delay-ns' to
 spi-peripheral-props.yaml

On Fri, May 27, 2022 at 02:32:26PM +0300, Serge Semin wrote:
> On Thu, May 26, 2022 at 08:54:04AM -0500, Rob Herring wrote:
> > On Thu, May 26, 2022 at 11:16:42AM +0530, Pratyush Yadav wrote:
> > > Hi Rob,
> > > 
> > > On 25/05/22 04:00PM, Rob Herring wrote:
> > > > SPI bus per device properties must be defined in spi-peripheral-props.yaml
> > > > for unevaluatedProperties checks to work correctly on device nodes.
> > > > 
> > > > This has the side effect of promoting 'rx-sample-delay-ns' to be a
> > > > common property, but functionally it's no different if it was defined in
> > > > a Synopsys specific schema file.
> > > 
> > > Functionally it is no different, but does this property make sense for 
> > > other controllers? If not then I don't see why we should pollute the 
> > > common list with controller-specific ones. For one, this now no longer 
> > > makes it obvious that this property should only be used with the 
> > > Synopsys controller. And if you keep making small exceptions for other 
> > > controllers too, soon the common list will be full of controller 
> > > properties and it will be a mess finding out what belongs to who.
> > 
> 
> > There's at least one other case already:
> > 
> >   cdns,read-delay:
> >     $ref: /schemas/types.yaml#/definitions/uint32
> >     description:
> >       Delay for read capture logic, in clock cycles.
> 
> What about creating the schemas hierarchy for the device-specific
> properties as I already suggested in the other thread? Like this:
> 
> https://lore.kernel.org/linux-ide/20220527101057.b5z7ase6y4naoxvk@mobilestation

Because that doesn't work. I'll explain in that thread.

Rob