netdev - Re: [PATCH net-next v1 07/10] net: dsa: microchip: warn about not supported synclko properties on KSZ9893 chips

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Date:   Sun, 14 Aug 2022 06:26:08 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Woojung Huh <woojung.huh@...rochip.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, UNGLinuxDriver@...rochip.com,
        Eric Dumazet <edumazet@...gle.com>,
        Vladimir Oltean <olteanv@...il.com>, kernel@...gutronix.de,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH net-next v1 07/10] net: dsa: microchip: warn about not
 supported synclko properties on KSZ9893 chips

Ccing Rob Herring.

On Sat, Aug 13, 2022 at 10:42:05PM +0200, Andrew Lunn wrote:
> On Sat, Aug 13, 2022 at 06:18:50PM +0200, Oleksij Rempel wrote:
> > On Sat, Aug 13, 2022 at 05:11:45PM +0200, Andrew Lunn wrote:
> > > On Sat, Aug 13, 2022 at 04:32:15PM +0200, Oleksij Rempel wrote:
> > > > On Fri, Aug 05, 2022 at 04:42:34PM +0300, Vladimir Oltean wrote:
> > > > > On Fri, Aug 05, 2022 at 01:56:01PM +0200, Oleksij Rempel wrote:
> > > > > > Hm, if we will have any random not support OF property in the switch
> > > > > > node. We won't be able to warn about it anyway. So, if it is present
> > > > > > but not supported, we will just ignore it.
> > > > > > 
> > > > > > I'll drop this patch.
> > > > > 
> > > > > To continue, I think the right way to go about this is to edit the
> > > > > dt-schema to say that these properties are only applicable to certain
> > > > > compatible strings, rather than for all. Then due to the
> > > > > "unevaluatedProperties: false", you'd get the warnings you want, at
> > > > > validation time.
> > > > 
> > > > Hm, with "unevaluatedProperties: false" i have no warnings. Even if I
> > > > create examples with random strings as properties. Are there some new
> > > > json libraries i should use?
> > > 
> > > Try
> > > 
> > > additionalProperties: False
> > 
> > Yes, it works. But in this case I'll do more changes. Just wont to make
> > sure I do not fix not broken things.
> 
> I've been working on converting some old SoCs bindings from .txt to
> .yaml. My observations is that the yaml is sometimes more restrictive
> than what the drivers actually imposes. So you might need to change
> perfectly working .dts files to get it warning free. Or you just
> accept the warnings and move on. At lot will depend on the number of
> warnings and how easy it is to see real problems mixed in with
> warnings you never intend to fix.

Heh :) Currently with "unevaluatedProperties: false" restrictions do not
work at all. At least for me. For example with this change I have no
warnings:
diff --git a/Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml b/Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml
index 1e26d876d1463..da38ad98a152f 100644
--- a/Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml
+++ b/Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml
@@ -120,6 +120,7 @@ examples:
             ethernet-switch@1 {
                     reg = <0x1>;
                     compatible = "nxp,sja1105t";
+                    something-random-here;
 
                     ethernet-ports {
                             #address-cells = <1>;

make dt_binding_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/net/dsa/nxp,sja1105.yaml

So the main question is, is it broken for all or just for me? If it is
just me, what i'm doing wrong?

Regards,
Oleksij
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