linux-kernel - Re: [PATCH v2] dt-bindings: net: nxp,sja1105: document spi-cpol/cpha

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Date:   Fri, 4 Nov 2022 18:52:30 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] dt-bindings: net: nxp,sja1105: document spi-cpol/cpha

On Fri, Nov 04, 2022 at 09:09:02AM -0400, Krzysztof Kozlowski wrote:
> > I think that spi-cpha/spi-cpol belongs to spi-peripheral-props.yaml just
> > as much as the others do.
> > 
> > The distinction "device specific, not controller specific" is arbitrary
> > to me. These are settings that the controller has to make in order to
> > talk to that specific peripheral. Same as many others in that file.
> 
> Not every fruit is an orange, but every orange is a fruit. You do not
> put "color: orange" to schema for fruits. You put it to the schema for
> oranges.
> 
> IOW, CPHA/CPOL are not valid for most devices, so they cannot be in
> spi-peripheral-props.yaml.

Ok, then this patch is not correct either. The "nxp,sja1105*" devices
need to have only "spi-cpha", and the "nxp,sja1110*" devices need to
have only "spi-cpol".