From: Andrew Lunn <andrew@lunn.ch>
To: "Adam Rudziński" <adam.rudzinski@arf.net.pl>
Cc: Florian Fainelli <f.fainelli@gmail.com>,
netdev@vger.kernel.org, m.felsch@pengutronix.de,
hkallweit1@gmail.com, richard.leitner@skidata.com,
zhengdejin5@gmail.com, devicetree@vger.kernel.org,
kernel@pengutronix.de, kuba@kernel.org, robh+dt@kernel.org
Subject: Re: [PATCH net-next 0/3] net: phy: Support enabling clocks prior to bus probe
Date: Fri, 4 Sep 2020 16:23:47 +0200 [thread overview]
Message-ID: <20200904142347.GP3112546@lunn.ch> (raw)
In-Reply-To: <ed801431-2b46-5d6d-0cfd-a4b043702f9f@arf.net.pl>
On Fri, Sep 04, 2020 at 04:00:55PM +0200, Adam Rudziński wrote:
> W dniu 2020-09-04 o 15:45, Andrew Lunn pisze:
> > > Just a bunch of questions.
> > >
> > > Actually, why is it necessary to have a full MDIO bus scan already during
> > > probing peripherals?
> > That is the Linux bus model. It does not matter what sort of bus it
> > is, PCI, USB, MDIO, etc. When the bus driver is loaded, the bus is
> > enumerated and drivers probe for each device found on the bus.
>
> OK. But is it always expected to find all the devices on the bus in the
> first run?
Yes. Cold plug expects to find all the device while scanning the bus.
> Does the bus model ever allow to just add any more devices? Kind of,
> "hotplug". :)
Hotplug is triggered by hardware saying a new device has been
added/removed after cold plug.
This is not a hotplug case. The hardware has not suddenly appeared, it
has always been there.
Andrew
next prev parent reply other threads:[~2020-09-04 14:24 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-03 4:39 [PATCH net-next 0/3] net: phy: Support enabling clocks prior to bus probe Florian Fainelli
2020-09-03 4:39 ` [PATCH net-next 1/3] " Florian Fainelli
2020-09-03 20:39 ` Andrew Lunn
2020-09-03 21:25 ` Andrew Lunn
2020-09-03 21:28 ` Rob Herring
2020-09-03 21:42 ` Andrew Lunn
2020-09-03 21:50 ` Florian Fainelli
2020-09-03 21:43 ` Florian Fainelli
2020-09-03 4:39 ` [PATCH net-next 2/3] net: phy: mdio-bcm-unimac: Enable GPHY resources during bus reset Florian Fainelli
2020-09-03 4:39 ` [PATCH net-next 3/3] net: phy: bcm7xxx: request and manage GPHY clock Florian Fainelli
2020-09-04 6:15 ` Marco Felsch
2020-09-04 15:37 ` Florian Fainelli
2020-09-07 7:34 ` Marco Felsch
2020-09-07 19:07 ` Marco Felsch
2020-09-04 6:18 ` Marco Felsch
2020-09-04 15:38 ` Florian Fainelli
2020-09-07 7:37 ` Marco Felsch
2020-09-04 4:04 ` [PATCH net-next 0/3] net: phy: Support enabling clocks prior to bus probe Florian Fainelli
2020-09-04 6:19 ` Adam Rudziński
2020-09-04 13:45 ` Andrew Lunn
2020-09-04 14:00 ` Adam Rudziński
2020-09-04 14:23 ` Andrew Lunn [this message]
2020-09-04 17:21 ` Adam Rudziński
2020-09-04 13:58 ` Andrew Lunn
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