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Date:   Mon, 9 May 2022 16:56:06 +0100
From:   Mark Brown <broonie@kernel.org>
To:     LABBE Corentin <clabbe@baylibre.com>
Cc:     Andrew Lunn <andrew@lunn.ch>, alexandre.torgue@foss.st.com,
        calvin.johnson@oss.nxp.com, davem@davemloft.net,
        edumazet@google.com, hkallweit1@gmail.com,
        jernej.skrabec@gmail.com, joabreu@synopsys.com,
        krzysztof.kozlowski+dt@linaro.org, kuba@kernel.org,
        lgirdwood@gmail.com, linux@armlinux.org.uk, pabeni@redhat.com,
        peppe.cavallaro@st.com, robh+dt@kernel.org, samuel@sholland.org,
        wens@csie.org, netdev@vger.kernel.org, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-sunxi@lists.linux.dev
Subject: Re: [PATCH 0/6] arm64: add ethernet to orange pi 3
Message-ID: <Ynk5loCKWCF4/DLT@sirena.org.uk>
References: <20220509074857.195302-1-clabbe@baylibre.com>
 <YnkG9yV+Fbf7WtCh@lunn.ch>
 <YnkWwrKk4zjPnZLg@Red>
 <Ynkw9EekNj5Ih5gc@lunn.ch>
 <YnkyKiRmOEYEtO3z@Red>
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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 =E9crit :

> > 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/Orange=
Pi_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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