linux-kernel - Re: [PATCH v6 1/3] dt-bindings: marvell: Document the AC5/AC5X compatibles

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Date:   Thu, 12 May 2022 02:45:40 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Chris Packham <Chris.Packham@...iedtelesis.co.nz>
Cc:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will@...nel.org" <will@...nel.org>,
        "gregory.clement@...tlin.com" <gregory.clement@...tlin.com>,
        "sebastian.hesselbarth@...il.com" <sebastian.hesselbarth@...il.com>,
        "kostap@...vell.com" <kostap@...vell.com>,
        "robert.marko@...tura.hr" <robert.marko@...tura.hr>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v6 1/3] dt-bindings: marvell: Document the AC5/AC5X
 compatibles

> Yes there are registers that you can read to identify the specific chip.
> 
> It still might be useful to have a expected vs actual check as those ID 
> values are determined by pin strapping resistors.

That i don't get? Can i turn a 

* 98DX2538: 24x1G + 2x10G + 2x10G Stack

into a

* 98DX2535: 24x1G + 4x1G Stack

by strapping its pin differently?

> It could also be used 
> to validate the dts (e.g. port 20 would be invalid on a 98DX3501). But 
> those are considerations for further down the track.

Yes, that would be up to the switchdev driver to validate the DT based
on the ID register.

   Andrew