linux-kernel - Re: [PATCH] dt-bindings: can: convert tcan4x5x.txt to DT schema

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Message-ID: <g2knbmyi7cy4xnkospby7xtp6t4f2ppfdbtdyjteltrlnaihcp@gdjhp4n5w7u3>
Date: Tue, 5 Nov 2024 13:59:31 +0100
From: Sean Nyekjaer <sean@...nix.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, 
	Marc Kleine-Budde <mkl@...gutronix.de>
Cc: Vincent Mailhol <mailhol.vincent@...adoo.fr>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, linux-can@...r.kernel.org, 
	netdev@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: can: convert tcan4x5x.txt to DT schema

On Tue, Nov 05, 2024 at 01:41:26PM +0100, Krzysztof Kozlowski wrote:

[...]

> > Schema check will fail, but driver wize it will work just fine.
> 
> Schema will not fail. That's the problem - no errors will be ever
> reported. The entire point of the schema, in contrast to TXT, is to
> detect errors and that ridiculous wildcard used as front compatible
> affects/reduces detection.

NOW I get it :)

diff --git a/Documentation/devicetree/bindings/net/can/ti,tcan4x5x.yaml b/Documentation/devicetree/bindings/net/can/ti,tcan4x5x.yaml
index f1d18a5461e0..4fb5e5e80a03 100644
--- a/Documentation/devicetree/bindings/net/can/ti,tcan4x5x.yaml
+++ b/Documentation/devicetree/bindings/net/can/ti,tcan4x5x.yaml
@@ -169,7 +169,7 @@ examples:
         #size-cells = <0>;

         can@0 {
-            compatible = "ti,tcan4552", "ti,tcan4x5x";
+            compatible = "ti,tcan4552";
             reg = <0>;
             clocks = <&can0_osc>;
             pinctrl-names = "default";

Would result in a schema check fail, but the driver will never be probed.

> 
> > Agree that is kinda broken.
> > If I have time I can try to fix that later.
> 
> No, the fix is to drop the wildcard alone, as I said in your RFC.

@Mark, would you be okay with fixing the wildcard in this series?
We have some out-of-tree dtb's that will need fixing, but I get it would be
prefered to get this fixed.

> 
> > 
> > Please explain one more time for me. Is this a comment on the if
> > sentence or the broken behavior of the driver?
> 
> This is just generic comment, nothing to change here because you decided
> not to fix that wildcard from old binding.

Thanks for the clarification!

@Mark, @Krzysztof: What to do from here?

/Sean