linux-kernel - Re: [PATCH net-next v7 5/7] ARM64: dts: marvell: Fix some common switch mistakes

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Date:   Wed, 25 Oct 2023 22:56:38 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Pali Rohár <pali@...nel.org>,
        Enrico Mioso <mrkiko.rs@...il.com>,
        Robert Marko <robert.marko@...tura.hr>,
        Russell King <linux@...linux.org.uk>,
        Chris Packham <chris.packham@...iedtelesis.co.nz>,
        Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        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>,
        Marek Behún <kabel@...nel.org>,
        Christian Marangi <ansuelsmth@...il.com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v7 5/7] ARM64: dts: marvell: Fix some common
 switch mistakes

On Wed, Oct 25, 2023 at 9:48 PM Linus Walleij <linus.walleij@...aro.org> wrote:

> We  *COULD* add a second over-specified compatible to the switch
> node. Such as:
>
>       switch0@10 {
>                 compatible = "marvell,turris-mox-mv88e6190-switch",
> "marvell,mv88e6190";
>
> (and the same for the 6085 version)
>
> And use that to relax the requirement for that variant with an - if:
> statemement.
>
> This should work fine since U-Boot is only looking for nodenames, not
> compatible strings. I think I will try this approach.

This works. Compatibles added like such to the turris-mox nodes:

        switch0@10 {
-               compatible = "marvell,mv88e6190";
+               compatible = "marvell,turris-mox-mv88e6190",
"marvell,mv88e6190";

The mv88e6xxx schema will look like so:

 properties:
   compatible:
+    oneOf:
+      - enum:
+          - marvell,mv88e6085
+          - marvell,mv88e6190
+          - marvell,mv88e6250
(...)
+      - items:
+          - const: marvell,turris-mox-mv88e6085
+          - const: marvell,mv88e6085
+      - items:
+          - const: marvell,turris-mox-mv88e6190
+          - const: marvell,mv88e6190

Then ethernet-switch.yaml gets this:

-properties:
-  $nodename:
-    pattern: "^(ethernet-)?switch(@.*)?$"
+allOf:
+  # This condition is here to satisfy the case where certain device
+  # nodes have to preserve non-standard names because of
+  # backward-compatibility with boot loaders inspecting certain
+  # node names.
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - marvell,turris-mox-mv88e6085
+              - marvell,turris-mox-mv88e6190
+    then:
+      properties:
+        $nodename:
+          pattern: "switch[0-3]@[0-3]+$"
+    else:
+      properties:
+        $nodename:
+          pattern: "^(ethernet-)?switch(@.*)?$"

This latter thing is maybe not so nice for everyone to process.

The alternative is however to copy all of dsa.yaml, dsa-port.yaml and
ethernet-port.yaml (maybe more) into the Marvell binding. Which I can do,
of course. (qca8k is already deviant).

Unless there is a better way.

Yours,
Linus Walleij