linux-kernel - Re: [PATCH 14/15] net: phy: add PHY regulator support

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Message-ID: <CAMRc=Me1r3Mzfg3-gTsGk4rEtvB=P9ESkn9q=c7z0Q=YQDsw2A@mail.gmail.com>
Date:   Tue, 23 Jun 2020 11:41:11 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
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        Tom Lendacky <thomas.lendacky@....com>,
        Jassi Brar <jaswinder.singh@...aro.org>,
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        Liam Girdwood <lgirdwood@...il.com>,
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        netdev <netdev@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
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        Fabien Parent <fparent@...libre.com>,
        Stephane Le Provost <stephane.leprovost@...iatek.com>,
        Pedro Tsai <pedro.tsai@...iatek.com>,
        Andrew Perepech <andrew.perepech@...iatek.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH 14/15] net: phy: add PHY regulator support

pon., 22 cze 2020 o 15:29 Russell King - ARM Linux admin
<linux@...linux.org.uk> napisał(a):
>

[snip!]

>
> This is likely to cause issues for some PHY drivers.  Note that we have
> some PHY drivers which register a temperature sensor in the probe
> function, which means they can be accessed independently of the lifetime
> of the PHY bound to the network driver (which may only be while the
> network device is "up".)  We certainly do not want hwmon failing just
> because the network device is down.
>
> That's kind of worked around for the reset stuff, because there are two
> layers to that: the mdio device layer reset support which knows nothing
> of the PHY binding state to the network driver, and the phylib reset
> support, but it is not nice.
>

Regulators are reference counted so if the hwmon driver enables it
using mdio_device_power_on() it will stay on even after the PHY driver
calls phy_device_power_off(), right? Am I missing something?

Bart