netdev - Re: [PATCH 1/3] dt-bindings: net: nuvoton: Add schema for Nuvoton MA35 family GMAC

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Message-ID: <20241107-slip-graceful-767507d20d1b@spud>
Date: Thu, 7 Nov 2024 17:09:23 +0000
From: Conor Dooley <conor@...nel.org>
To: Joey Lu <a0987203069@...il.com>
Cc: andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, robh@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org, mcoquelin.stm32@...il.com,
	richardcochran@...il.com, alexandre.torgue@...s.st.com,
	joabreu@...opsys.com, ychuang3@...oton.com, schung@...oton.com,
	yclu4@...oton.com, linux-arm-kernel@...ts.infradead.org,
	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, openbmc@...ts.ozlabs.org,
	linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH 1/3] dt-bindings: net: nuvoton: Add schema for Nuvoton
 MA35 family GMAC

On Thu, Nov 07, 2024 at 06:15:51PM +0800, Joey Lu wrote:
> Conor Dooley 於 11/6/2024 11:44 PM 寫道:
> > On Wed, Nov 06, 2024 at 07:19:28PM +0800, Joey Lu wrote:
> > > +  nuvoton,sys:
> > > +    $ref: /schemas/types.yaml#/definitions/phandle
> > > +    description: phandle to access GCR (Global Control Register) registers.
> > Why do you need a phandle to this? You appear to have multiple dwmacs on
> > your device if the example is anything to go by, how come you don't need
> > to access different portions of this depending on which dwmac instance
> > you are?
> On our platform, a system register is required to specify the TX/RX clock
> path delay control, switch modes between RMII and RGMII, and configure other
> related settings.
> > > +  resets:
> > > +    maxItems: 1
> > > +
> > > +  reset-names:
> > > +    items:
> > > +      - const: stmmaceth
> > > +
> > > +  mac-id:
> > > +    maxItems: 1
> > > +    description:
> > > +      The interface of MAC.
> > A vendor prefix is required for custom properties, but I don't think you
> > need this and actually it is a bandaid for some other information you're
> > missing. Probably related to your nuvoton,sys property only being a
> > phandle with no arguments.
> This property will be removed.

I'm almost certain you can't just remove this property, because you need
it to tell which portion of the GCR is applicable to the dwmac instance
in question. Instead, you need to ad an argument to your phandle. The
starfive dwmac binding/driver has an example of what you can do.

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