linux-kernel - Re: [net-next RFC PATCH 03/14] dt-bindings: net: document ethernet PHY package nodes

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Date:   Mon, 20 Nov 2023 19:45:11 +0100
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Daniel Golle <daniel@...rotopia.org>,
        Qingfang Deng <dqfext@...il.com>,
        SkyLake Huang <SkyLake.Huang@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        David Epping <david.epping@...singlinkelectronics.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Harini Katakam <harini.katakam@....com>,
        Simon Horman <horms@...nel.org>,
        Robert Marko <robert.marko@...tura.hr>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [net-next RFC PATCH 03/14] dt-bindings: net: document ethernet
 PHY package nodes

On Mon, Nov 20, 2023 at 10:25:10PM +0100, Andrew Lunn wrote:
> > A real DT that use this is (ipq807x):
> > 
> > &mdio {
> > 	status = "okay";
> > 	pinctrl-0 = <&mdio_pins>;
> > 	pinctrl-names = "default";
> > 	reset-gpios = <&tlmm 37 GPIO_ACTIVE_LOW>;
> > 
> > 	ethernet-phy-package {
> > 		compatible = "ethernet-phy-package";
> > 		phy-mode = "psgmii";
> > 
> > 		global-phys = <&qca8075_4>, <&qca8075_psgmii>;
> > 		global-phy-names = "combo", "analog_psgmii";
> > 
> > 		qca8075_0: ethernet-phy@0 {
> > 			compatible = "ethernet-phy-ieee802.3-c22";
> > 			reg = <0>;
> > 		};
> 
> ...
> 
> > 	};
> > 
> > 	qca8081: ethernet-phy@28 {
> > 		compatible = "ethernet-phy-id004d.d101";
> > 		reg = <28>;
> > 		reset-gpios = <&tlmm 31 GPIO_ACTIVE_LOW>;
> > 	};
> 
> I've no idea if DT allows this. The issue is that reg is the same for
> both nodes within the ethernet-phy-package container, and
> ethernet-phy@28. They are all addresses on the same MDIO bus.  We are
> parsing this bus structure ourselves in __of_mdiobus_register(), so we
> could make it work, but i don't know if we should make it work.
>

And that is why I have some reserve on the idea of defining a reg for
ethernet-phy-package. Adding a reg would create some duplicate. Is it
really a problem to have a node with no reg in the mdio node?

(patch 04 of this series already updates the parsing function to check
one level deeper in the presence of the ethernet-phy-compatible treating
any node found as it was defined in the upper mdio node)

-- 
	Ansuel