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From: Andrew Lunn <andrew@lunn.ch>
To: Maxime Chevallier <maxime.chevallier@bootlin.com>
Cc: davem@davemloft.net, Rob Herring <robh+dt@kernel.org>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	devicetree@vger.kernel.org, thomas.petazzoni@bootlin.com,
	Florian Fainelli <f.fainelli@gmail.com>,
	Heiner Kallweit <hkallweit1@gmail.com>,
	Russell King <linux@armlinux.org.uk>,
	linux-arm-kernel@lists.infradead.org,
	Horatiu.Vultur@microchip.com, Allan.Nielsen@microchip.com,
	UNGLinuxDriver@microchip.com
Subject: Re: [PATCH net-next 3/4] net: phy: Add helper to derive the number of ports from a phy mode
Date: Thu, 28 Jul 2022 23:32:36 +0200	[thread overview]
Message-ID: <YuMAdACnRKsL8/xD@lunn.ch> (raw)
In-Reply-To: <20220728145252.439201-4-maxime.chevallier@bootlin.com>

> +int phy_interface_num_ports(phy_interface_t interface)
> +{
> +	switch (interface) {
> +	case PHY_INTERFACE_MODE_NA:
> +	case PHY_INTERFACE_MODE_INTERNAL:
> +		return 0;

I've not yet looked at how this is used. Returning 0 could have
interesting effects i guess? INTERNAL clearly does have some sort of
path between the MAC and the PHY, so i think 1 would be a better
value. NA is less clear, it generally means Don't touch. But again,
there still needs to be a path between the MAC and PHY, otherwise
there would not be any to touch.

Why did you pick 0?

> +
> +	case PHY_INTERFACE_MODE_MII:
> +	case PHY_INTERFACE_MODE_GMII:
> +	case PHY_INTERFACE_MODE_TBI:
> +	case PHY_INTERFACE_MODE_REVMII:
> +	case PHY_INTERFACE_MODE_RMII:
> +	case PHY_INTERFACE_MODE_REVRMII:
> +	case PHY_INTERFACE_MODE_RGMII:
> +	case PHY_INTERFACE_MODE_RGMII_ID:
> +	case PHY_INTERFACE_MODE_RGMII_RXID:
> +	case PHY_INTERFACE_MODE_RGMII_TXID:
> +	case PHY_INTERFACE_MODE_RTBI:
> +	case PHY_INTERFACE_MODE_XGMII:
> +	case PHY_INTERFACE_MODE_XLGMII:
> +	case PHY_INTERFACE_MODE_MOCA:
> +	case PHY_INTERFACE_MODE_TRGMII:
> +	case PHY_INTERFACE_MODE_USXGMII:
> +	case PHY_INTERFACE_MODE_SGMII:
> +	case PHY_INTERFACE_MODE_SMII:
> +	case PHY_INTERFACE_MODE_1000BASEX:
> +	case PHY_INTERFACE_MODE_2500BASEX:
> +	case PHY_INTERFACE_MODE_5GBASER:
> +	case PHY_INTERFACE_MODE_10GBASER:
> +	case PHY_INTERFACE_MODE_25GBASER:
> +	case PHY_INTERFACE_MODE_10GKR:
> +	case PHY_INTERFACE_MODE_100BASEX:
> +	case PHY_INTERFACE_MODE_RXAUI:
> +	case PHY_INTERFACE_MODE_XAUI:
> +		return 1;
> +	case PHY_INTERFACE_MODE_QSGMII:
> +	case PHY_INTERFACE_MODE_QUSGMII:
> +		return 4;
> +
> +	default:
> +		return 0;
> +	}
> +}

Have you tried without a default: ? I _think_ gcc will then warn about
missing enum values, which will help future developers when they add
further values to the enum.

	Andrew

_______________________________________________
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
From: Andrew Lunn <andrew@lunn.ch>
To: Maxime Chevallier <maxime.chevallier@bootlin.com>
Cc: davem@davemloft.net, Rob Herring <robh+dt@kernel.org>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	devicetree@vger.kernel.org, thomas.petazzoni@bootlin.com,
	Florian Fainelli <f.fainelli@gmail.com>,
	Heiner Kallweit <hkallweit1@gmail.com>,
	Russell King <linux@armlinux.org.uk>,
	linux-arm-kernel@lists.infradead.org,
	Horatiu.Vultur@microchip.com, Allan.Nielsen@microchip.com,
	UNGLinuxDriver@microchip.com
Subject: Re: [PATCH net-next 3/4] net: phy: Add helper to derive the number of ports from a phy mode
Date: Thu, 28 Jul 2022 23:32:36 +0200	[thread overview]
Message-ID: <YuMAdACnRKsL8/xD@lunn.ch> (raw)
In-Reply-To: <20220728145252.439201-4-maxime.chevallier@bootlin.com>

> +int phy_interface_num_ports(phy_interface_t interface)
> +{
> +	switch (interface) {
> +	case PHY_INTERFACE_MODE_NA:
> +	case PHY_INTERFACE_MODE_INTERNAL:
> +		return 0;

I've not yet looked at how this is used. Returning 0 could have
interesting effects i guess? INTERNAL clearly does have some sort of
path between the MAC and the PHY, so i think 1 would be a better
value. NA is less clear, it generally means Don't touch. But again,
there still needs to be a path between the MAC and PHY, otherwise
there would not be any to touch.

Why did you pick 0?

> +
> +	case PHY_INTERFACE_MODE_MII:
> +	case PHY_INTERFACE_MODE_GMII:
> +	case PHY_INTERFACE_MODE_TBI:
> +	case PHY_INTERFACE_MODE_REVMII:
> +	case PHY_INTERFACE_MODE_RMII:
> +	case PHY_INTERFACE_MODE_REVRMII:
> +	case PHY_INTERFACE_MODE_RGMII:
> +	case PHY_INTERFACE_MODE_RGMII_ID:
> +	case PHY_INTERFACE_MODE_RGMII_RXID:
> +	case PHY_INTERFACE_MODE_RGMII_TXID:
> +	case PHY_INTERFACE_MODE_RTBI:
> +	case PHY_INTERFACE_MODE_XGMII:
> +	case PHY_INTERFACE_MODE_XLGMII:
> +	case PHY_INTERFACE_MODE_MOCA:
> +	case PHY_INTERFACE_MODE_TRGMII:
> +	case PHY_INTERFACE_MODE_USXGMII:
> +	case PHY_INTERFACE_MODE_SGMII:
> +	case PHY_INTERFACE_MODE_SMII:
> +	case PHY_INTERFACE_MODE_1000BASEX:
> +	case PHY_INTERFACE_MODE_2500BASEX:
> +	case PHY_INTERFACE_MODE_5GBASER:
> +	case PHY_INTERFACE_MODE_10GBASER:
> +	case PHY_INTERFACE_MODE_25GBASER:
> +	case PHY_INTERFACE_MODE_10GKR:
> +	case PHY_INTERFACE_MODE_100BASEX:
> +	case PHY_INTERFACE_MODE_RXAUI:
> +	case PHY_INTERFACE_MODE_XAUI:
> +		return 1;
> +	case PHY_INTERFACE_MODE_QSGMII:
> +	case PHY_INTERFACE_MODE_QUSGMII:
> +		return 4;
> +
> +	default:
> +		return 0;
> +	}
> +}

Have you tried without a default: ? I _think_ gcc will then warn about
missing enum values, which will help future developers when they add
further values to the enum.

	Andrew

  reply	other threads:[~2022-07-28 21:33 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-28 14:52 [PATCH net-next 0/4] net: Introduce QUSGMII phy mode Maxime Chevallier
2022-07-28 14:52 ` Maxime Chevallier
2022-07-28 14:52 ` [PATCH net-next 1/4] net: phy: Introduce QUSGMII PHY mode Maxime Chevallier
2022-07-28 14:52   ` Maxime Chevallier
2022-07-28 21:23   ` Andrew Lunn
2022-07-28 21:23     ` Andrew Lunn
2022-07-28 14:52 ` [PATCH net-next 2/4] dt-bindings: net: ethernet-controller: add QUSGMII mode Maxime Chevallier
2022-07-28 14:52   ` Maxime Chevallier
2022-07-28 14:52 ` [PATCH net-next 3/4] net: phy: Add helper to derive the number of ports from a phy mode Maxime Chevallier
2022-07-28 14:52   ` Maxime Chevallier
2022-07-28 21:32   ` Andrew Lunn [this message]
2022-07-28 21:32     ` Andrew Lunn
2022-07-28 21:44     ` Florian Fainelli
2022-07-28 21:44       ` Florian Fainelli
2022-07-29  6:50       ` Maxime Chevallier
2022-07-29  6:50         ` Maxime Chevallier
2022-07-29  7:32     ` Maxime Chevallier
2022-07-29  7:32       ` Maxime Chevallier
2022-07-29 13:00       ` Andrew Lunn
2022-07-29 13:00         ` Andrew Lunn
2022-07-28 14:52 ` [PATCH net-next 4/4] net: lan966x: Add QUSGMII support for lan966x Maxime Chevallier
2022-07-28 14:52   ` Maxime Chevallier

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