linux-kernel - Re: [PATCH net-next v5 4/4] net: phy: tja11xx: add delayed registration of TJA1102 PHY1

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Date:   Wed, 22 Apr 2020 20:21:27 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Oleksij Rempel <o.rempel@...gutronix.de>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Pengutronix Kernel Team <kernel@...gutronix.de>,
        linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Marek Vasut <marex@...x.de>, David Jander <david@...tonic.nl>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH net-next v5 4/4] net: phy: tja11xx: add delayed
 registration of TJA1102 PHY1



On 4/22/2020 2:24 AM, Oleksij Rempel wrote:
> TJA1102 is a dual PHY package with PHY0 having proper PHYID and PHY1
> having no ID. On one hand it is possible to for PHY detection by
> compatible, on other hand we should be able to reset complete chip
> before PHY1 configured it, and we need to define dependencies for proper
> power management.
> 
> We can solve it by defining PHY1 as child of PHY0:
> 	tja1102_phy0: ethernet-phy@4 {
> 		reg = <0x4>;
> 
> 		interrupts-extended = <&gpio5 8 IRQ_TYPE_LEVEL_LOW>;
> 
> 		reset-gpios = <&gpio5 9 GPIO_ACTIVE_LOW>;
> 		reset-assert-us = <20>;
> 		reset-deassert-us = <2000>;
> 
> 		tja1102_phy1: ethernet-phy@5 {
> 			reg = <0x5>;
> 
> 			interrupts-extended = <&gpio5 8 IRQ_TYPE_LEVEL_LOW>;
> 		};
> 	};
> 
> The PHY1 should be a subnode of PHY0 and registered only after PHY0 was
> completely reset and initialized.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>

You did not expand too much on why you had to use a workqueue to 
register the second PHY instance?
-- 
Florian