linux-kernel - Re: [PATCH 2/5] dt-bindings: net: Add MTIP L2 switch description (fec,mtip-switch.yaml)

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Message-ID: <20250325133949.7782a8a5@wsk>
Date: Tue, 25 Mar 2025 13:39:49 +0100
From: Lukasz Majewski <lukma@...x.de>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, Sascha
 Hauer <s.hauer@...gutronix.de>, Paolo Abeni <pabeni@...hat.com>, Jakub
 Kicinski <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>,
 davem@...emloft.net, Andrew Lunn <andrew+netdev@...n.ch>, Pengutronix
 Kernel Team <kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>,
 devicetree@...r.kernel.org, imx@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, Richard
 Cochran <richardcochran@...il.com>, netdev@...r.kernel.org, Maxime
 Chevallier <maxime.chevallier@...tlin.com>
Subject: Re: [PATCH 2/5] dt-bindings: net: Add MTIP L2 switch description
 (fec,mtip-switch.yaml)

Hi Krzysztof,

> On 25/03/2025 13:15, Lukasz Majewski wrote:
> > Hi Krzysztof,
> >   
> >> On 25/03/2025 12:57, Lukasz Majewski wrote:  
> >>> This patch provides description of the MTIP L2 switch available in
> >>> some NXP's SOCs - imx287, vf610.
> >>>
> >>> Signed-off-by: Lukasz Majewski <lukma@...x.de>
> >>> ---
> >>>  .../bindings/net/fec,mtip-switch.yaml         | 160
> >>> ++++++++++++++++++    
> >>
> >> Use compatible as filename.  
> > 
> > I've followed the fsl,fec.yaml as an example. This file has
> > description for all the device tree sources from fec_main.c  
> 
> 
> That's a 14 year old binding, so clear antipattern.

For some reason it is still there...

> 
> > 
> > I've considered adding the full name - e.g.
> > fec,imx287-mtip-switch.yaml but this driver could (and probably
> > will) be extended to vf610.  
> 
> Unless you add vf610 now, this should follow the compatible name.

Ok.

> 
> > 
> > So what is the advised way to go?
> >   
> >>  
> >>>  1 file changed, 160 insertions(+)
> >>>  create mode 100644
> >>> Documentation/devicetree/bindings/net/fec,mtip-switch.yaml
> >>>
> >>> diff --git
> >>> a/Documentation/devicetree/bindings/net/fec,mtip-switch.yaml
> >>> b/Documentation/devicetree/bindings/net/fec,mtip-switch.yaml new
> >>> file mode 100644 index 000000000000..cd85385e0f79 --- /dev/null
> >>> +++ b/Documentation/devicetree/bindings/net/fec,mtip-switch.yaml
> >>> @@ -0,0 +1,160 @@
> >>> +# SPDX-License-Identifier: GPL-2.0-only
> >>> +%YAML 1.2
> >>> +---
> >>> +$id: http://devicetree.org/schemas/net/fsl,mtip-switch.yaml#
> >>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> >>> +
> >>> +title: Freescale MTIP Level 2 (L2) switch
> >>> +
> >>> +maintainers:
> >>> +  - Lukasz Majewski <lukma@...x.de>
> >>> +    
> >>
> >> description?  
> > 
> > Ok.
> >   
> >>  
> >>> +allOf:
> >>> +  - $ref: ethernet-controller.yaml#
> >>> +
> >>> +properties:
> >>> +  compatible:
> >>> +    oneOf:    
> >>
> >> Drop, you have only one variant.  
> > 
> > Ok, for imx287 this can be dropped, and then extended with vf610.
> >   
> >>  
> >>> +      - enum:
> >>> +	  - imx287-mtip-switch    
> >>
> >> This wasn't tested. Except whitespace errors, above compatible does
> >> not have format of compatible. Please look at other NXP bindings.
> >>
> >> Missing blank line.
> >>  
> >>> +  reg:
> >>> +    maxItems: 1
> >>> +
> >>> +  interrupts:
> >>> +    maxItems: 3    
> >>
> >> Need to list items instead.
> >>  
> >>> +
> >>> +  clocks:
> >>> +    maxItems: 4
> >>> +    description:
> >>> +      The "ipg", for MAC ipg_clk_s, ipg_clk_mac_s that are for
> >>> register accessing.
> >>> +      The "ahb", for MAC ipg_clk, ipg_clk_mac that are bus clock.
> >>> +      The "ptp"(option), for IEEE1588 timer clock that requires
> >>> the clock.
> >>> +      The "enet_out"(option), output clock for external device,
> >>> like supply clock
> >>> +      for PHY. The clock is required if PHY clock source from
> >>> SOC. 
> >>
> >> Same problems. This binding does not look at all as any other
> >> binding. I finish review here, but the code has similar trivial
> >> issues all the way, including incorrect indentation. Start from
> >> well reviewed existing binding or example-schema.  
> > 
> > As I've stated above - this code is reduced copy of fsl,fec.yaml...
> >  
> 
> Don't take the worst, old code with all the anti-patterns we point out
> on each review, as an example.
> 
> Take the most recent, well reviewed binding as an example. Or
> example-schema.

Ok.

> 
> Best regards,
> Krzysztof


Best regards,

Lukasz Majewski

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