linux-kernel - Re: [PATCH v4 04/16] net: phy: Add helper for mapping RGMII link speed to clock rate

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Message-ID: <cf51e433-4622-498a-8754-60b220cb6aab@lunn.ch>
Date: Tue, 29 Oct 2024 13:02:11 +0100
From: Andrew Lunn <andrew@...n.ch>
To: jan.petrous@....nxp.com
Cc: Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Vinod Koul <vkoul@...nel.org>,
	Richard Cochran <richardcochran@...il.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Emil Renner Berthing <kernel@...il.dk>,
	Minda Chen <minda.chen@...rfivetech.com>,
	Nicolas Ferre <nicolas.ferre@...rochip.com>,
	Claudiu Beznea <claudiu.beznea@...on.dev>,
	Iyappan Subramanian <iyappan@...amperecomputing.com>,
	Keyur Chudgar <keyur@...amperecomputing.com>,
	Quan Nguyen <quan@...amperecomputing.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	imx@...ts.linux.dev, devicetree@...r.kernel.org,
	NXP S32 Linux Team <s32@....com>,
	"Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
Subject: Re: [PATCH v4 04/16] net: phy: Add helper for mapping RGMII link
 speed to clock rate

On Mon, Oct 28, 2024 at 09:24:46PM +0100, Jan Petrous via B4 Relay wrote:
> From: "Jan Petrous (OSS)" <jan.petrous@....nxp.com>
> 
> The RGMII interface supports three data rates: 10/100 Mbps
> and 1 Gbps. These speeds correspond to clock frequencies
> of 2.5/25 MHz and 125 MHz, respectively.
> 
> Many Ethernet drivers, including glues in stmmac, follow
> a similar pattern of converting RGMII speed to clock frequency.
> 
> To simplify code, define the helper rgmii_clock(speed)
> to convert connection speed to clock frequency.
> 
> Suggested-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
> Signed-off-by: Jan Petrous (OSS) <jan.petrous@....nxp.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew