netdev - Re: [PATCH net-next v3 06/10] dt-bindings: net: Add Synopsys DW xPCS bindings

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Message-ID: <20240628221246.GA296233-robh@kernel.org>
Date: Fri, 28 Jun 2024 16:12:46 -0600
From: Rob Herring <robh@...nel.org>
To: Serge Semin <fancer.lancer@...il.com>
Cc: Conor Dooley <conor@...nel.org>, Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>,
	Jose Abreu <Jose.Abreu@...opsys.com>,
	Vladimir Oltean <olteanv@...il.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Maxime Chevallier <maxime.chevallier@...tlin.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Sagar Cheluvegowda <quic_scheluve@...cinc.com>,
	Abhishek Chauhan <quic_abchauha@...cinc.com>,
	Andrew Halaney <ahalaney@...hat.com>,
	Jiawen Wu <jiawenwu@...stnetic.com>,
	Mengyuan Lou <mengyuanlou@...-swift.com>,
	Tomer Maimon <tmaimon77@...il.com>, openbmc@...ts.ozlabs.org,
	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 06/10] dt-bindings: net: Add Synopsys DW xPCS
 bindings

On Thu, Jun 27, 2024 at 08:10:48PM +0300, Serge Semin wrote:
> On Thu, Jun 27, 2024 at 04:51:22PM +0100, Conor Dooley wrote:
> > On Thu, Jun 27, 2024 at 03:41:26AM +0300, Serge Semin wrote:
> > > +  clocks:
> > > +    description:
> > > +      Both MCI and APB3 interfaces are supposed to be equipped with a clock
> > > +      source connected via the clk_csr_i line.
> > > +
> > > +      PCS/PMA layer can be clocked by an internal reference clock source
> > > +      (phyN_core_refclk) or by an externally connected (phyN_pad_refclk) clock
> > > +      generator. Both clocks can be supplied at a time.
> > > +    minItems: 1
> > > +    maxItems: 3
> > > +
> > > +  clock-names:
> > > +    oneOf:
> > > +      - minItems: 1
> > > +        items:
> > > +          - enum: [core, pad]
> > > +          - const: pad
> > > +      - minItems: 1
> > > +        items:
> > > +          - const: pclk
> > > +          - enum: [core, pad]
> > > +          - const: pad
> > 
> 
> > While reading this, I'm kinda struggling to map "clk_csr_i" to a clock
> > name. Is that pclk? And why pclk if it is connected to "clk_csr_i"?
> 
> Right. It's "pclk". The reason of using the "pclk" name is that it has
> turned to be a de-facto standard name in the DT-bindings for the
> peripheral bus clock sources utilized for the CSR-space IO buses.
> Moreover the STMMAC driver responsible for the parental DW *MAC
> devices handling also has the "pclk" name utilized for the clk_csr_i
> signal. So using the "pclk" name in the tightly coupled devices (MAC
> and PCS) for the same signal seemed a good idea.

It is? That's really just the name of the bus clock for APB (Arm 
Peripheral Bus). If there's a name that matches the docs, use that. 
Though I'd drop 'clk_' part.

Rob