netdev - Re: [PATCH net-next v2 8/8] dt-bindings: net: sparx5: document RGMII MAC delays

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Message-ID: <20241120-decrease-wired-f6f21af817ce@spud>
Date: Wed, 20 Nov 2024 17:46:36 +0000
From: Conor Dooley <conor@...nel.org>
To: Daniel Machon <daniel.machon@...rochip.com>
Cc: UNGLinuxDriver@...rochip.com, Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Lars Povlsen <lars.povlsen@...rochip.com>,
	Steen Hegelund <Steen.Hegelund@...rochip.com>,
	Horatiu Vultur <horatiu.vultur@...rochip.com>,
	Russell King <linux@...linux.org.uk>, jacob.e.keller@...el.com,
	robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
	devicetree@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next v2 8/8] dt-bindings: net: sparx5: document RGMII
 MAC delays

On Mon, Nov 18, 2024 at 10:50:25AM +0000, Daniel Machon wrote:
> Hi Conor,
> 
> > > The lan969x switch device supports two RGMII port interfaces that can be
> > > configured for MAC level rx and tx delays.
> > > 
> > > Document two new properties {rx,tx}-internal-delay-ps. Make them
> > > required properties, if the phy-mode is one of: rgmii, rgmii_id,
> > > rgmii-rxid or rgmii-txid. Also specify accepted values.
> > > 
> > > Signed-off-by: Daniel Machon <daniel.machon@...rochip.com>
> > > ---
> > >  .../bindings/net/microchip,sparx5-switch.yaml        | 20 ++++++++++++++++++++
> > >  1 file changed, 20 insertions(+)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/net/microchip,sparx5-switch.yaml b/Documentation/devicetree/bindings/net/microchip,sparx5-switch.yaml
> > > index dedfad526666..a3f2b70c5c77 100644
> > > --- a/Documentation/devicetree/bindings/net/microchip,sparx5-switch.yaml
> > > +++ b/Documentation/devicetree/bindings/net/microchip,sparx5-switch.yaml
> > > @@ -129,6 +129,26 @@ properties:
> > >              minimum: 0
> > >              maximum: 383
> > >  
> > > +        allOf:
> > > +          - if:
> > > +              properties:
> > > +                phy-mode:
> > > +                  contains:
> > > +                    enum:
> > > +                      - rgmii
> > > +                      - rgmii-rxid
> > > +                      - rgmii-txid
> > > +                      - rgmii-id
> > > +            then:
> > > +              properties:
> > > +                rx-internal-delay-ps:
> > > +                  enum: [0, 1000, 1700, 2000, 2500, 3000, 3300]
> > > +                tx-internal-delay-ps:
> > > +                  enum: [0, 1000, 1700, 2000, 2500, 3000, 3300]
> > 
> > Properties should be define at the top level and constrained in the
> > if/then parts. Please move the property definitions out, and just leave
> > the required: bit here.
> > 
> > > +              required:
> > > +                - rx-internal-delay-ps
> > > +                - tx-internal-delay-ps
> > 
> > You've got no else, so these properties are valid even for !rgmii?
> > 
> > > +
> > >          required:
> > >            - reg
> > >            - phys
> > 
> > Additionally, please move the conditional bits below the required
> > property list.
> > 
> > Cheers,
> > Conor.
> 
> I will be getting rid of the 'required' constraints in v3. What I hear
> you say, is that the two {rx,tx}-internal-delay-ps properties (incl.
> their enum values) should be moved out of the if/else and to the
> top-level - can you confirm this?

> Is specifying the values
> a property can take not considered a constraint?

Actually, in this case the property isn't even defined (per
ethernet-controller.yaml) if the phy-mode wasn't an rgmii one, so what
you had here was probably fine. Ordinarily, that's not the case, so you'd
have been setting constraints for only rgmii phy-modes and no
constraints at all for non-rgmii phy-modes.



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