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

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Message-ID: <20220527113226.x62neigmrnljxtph@mobilestation>
Date:   Fri, 27 May 2022 14:32:26 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Rob Herring <robh@...nel.org>
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 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

-Sergey

> 
> 
> Too many common properties is not a problem we have. Too many custom 
> properties doing the same thing is the problem.
> 
> Rob