From: Trent Piepho <tpiepho@kymetacorp.com>
To: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: "barebox@lists.infradead.org" <barebox@lists.infradead.org>
Subject: Re: [PATCH 7/7] commands: Add mdio_read and mdio_write
Date: Wed, 27 Jan 2016 02:29:47 +0000 [thread overview]
Message-ID: <1453861806.29677.31.camel@rtred1test09.kymeta.local> (raw)
In-Reply-To: <CAHQ1cqEemyC0CfVQeshBuJtA1p0mCQaPB33noov4N7FSk5F+Ng@mail.gmail.com>
On Tue, 2016-01-26 at 18:09 -0800, Andrey Smirnov wrote:
> On Tue, Jan 26, 2016 at 1:55 PM, Sascha Hauer <s.hauer@pengutronix.de> wrote:
> > On Mon, Jan 25, 2016 at 09:55:58PM -0800, Andrey Smirnov wrote:
> >> Add commands for low-level access to MDIO bus.
> >
> > Do we really need this? We can already read/write phy registers using
> > /dev/phyx which imo is quite convenient since it can be accessed with
> > regular md/mw commands.
> >
> Just to explain the purpose of this patch -- there are number of
> reasons we might want to be able to access "unregistered" PHYs:
>
> - Not all MDIO attached devices would have PHYSID1,2 registers
> available which might cause mdiobus_scan() to not detect those PHYs
>
> - MDIO bus troubleshooting
Maybe instead have a command that adds a phydev to a mdio bus? So if
you wanted to issue commands to some address that doesn't have a phy
detected you could add a dummy phy using this command and then use
standard md/mw and so on commands with it. There is still a new command
but it does not have to duplicate existing functionality this way.
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next prev parent reply other threads:[~2016-01-27 2:30 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-26 5:55 [PATCH 1/7] include/linux/phy.h: Add MII_ADDR_C45 Andrey Smirnov
2016-01-26 5:55 ` [PATCH 2/7] net: Port bitbanged MDIO code from Linux kernel Andrey Smirnov
2016-01-26 5:55 ` [PATCH 3/7] miitool: Fix PHY argument handling Andrey Smirnov
2016-01-26 5:55 ` [PATCH 4/7] mdio_bus: Change dev_info to dev_dbg Andrey Smirnov
2016-01-26 5:55 ` [PATCH 5/7] mdio_bus: Add mdiobus_get_bus() function Andrey Smirnov
2016-01-26 5:55 ` [PATCH 6/7] miitool: Don't print negative parent IDs Andrey Smirnov
2016-01-26 5:55 ` [PATCH 7/7] commands: Add mdio_read and mdio_write Andrey Smirnov
2016-01-26 21:55 ` Sascha Hauer
2016-01-27 2:09 ` Andrey Smirnov
2016-01-27 2:29 ` Trent Piepho [this message]
2016-01-27 7:19 ` Sascha Hauer
2016-01-27 7:26 ` Sascha Hauer
2016-01-28 18:00 ` Andrey Smirnov
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