linux-kernel - Re: [PATCH 0/6] arm64: add ethernet to orange pi 3

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Message-ID: <Ynk5loCKWCF4/DLT@sirena.org.uk>
Date:   Mon, 9 May 2022 16:56:06 +0100
From:   Mark Brown <broonie@...nel.org>
To:     LABBE Corentin <clabbe@...libre.com>
Cc:     Andrew Lunn <andrew@...n.ch>, alexandre.torgue@...s.st.com,
        calvin.johnson@....nxp.com, davem@...emloft.net,
        edumazet@...gle.com, hkallweit1@...il.com,
        jernej.skrabec@...il.com, joabreu@...opsys.com,
        krzysztof.kozlowski+dt@...aro.org, kuba@...nel.org,
        lgirdwood@...il.com, linux@...linux.org.uk, pabeni@...hat.com,
        peppe.cavallaro@...com, robh+dt@...nel.org, samuel@...lland.org,
        wens@...e.org, netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH 0/6] arm64: add ethernet to orange pi 3

On Mon, May 09, 2022 at 05:24:26PM +0200, LABBE Corentin wrote:
> Le Mon, May 09, 2022 at 05:19:16PM +0200, Andrew Lunn a écrit :

> > I'm trying to understand the differences between the two different
> > regulators. If you tell me what the PHY is, i might be able to find
> > the data sheet, and then understand why two regulators are needed and
> > if one needs to be controlled by the PHY driver, not the MDIO bus
> > driver.

> The schematic for the board is https://linux-sunxi.org/images/5/50/OrangePi_3_Schematics_v1.5.pdf
> Which show a RTL8211E.

Most hardware will want all the regulators for the device turned on or
off en masse (possibly in a specific sequence) - it's rare for devices
to support only having some of their supplies enabled for extended
periods, I'd be surprised if something like a PHY did that.

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