[PATCH 7/7] commands: Add mdio_read and mdio_write
s.hauer at pengutronix.de
Tue Jan 26 23:19:39 PST 2016
On Wed, Jan 27, 2016 at 02:29:47AM +0000, Trent Piepho wrote:
> 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 at 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?
Or maybe even add an option to the existing miitool to do that.
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