Re: MII command to read and write specific registers

[Andrey Smirnov <andrew.smirnov@gmail.com>]

On Thu, Jul 11, 2019 at 10:36 AM Antony Pavlov <antonynpavlov@gmail.com> wrote:
>
> On Thu, 11 Jul 2019 15:30:01 +0200
> Benjamin Beckmeyer <beb@eks-engel.de> wrote:
>
> > Hey all,
> > is there a possibility to read/write specific registers from/to different MII addresses?
> >
> > I know that there is miitool but it just can give me the first 16 registers of a PHY.
> > But I need write specific registers e.g. MII addr 2 register 0 and read MII addr 2
> > register 1. I know uboot is having the mii command(exactly what I would need), and I
> > have seen that there were parameters for address and register in miitool but they
> > were deleted lastly.
> >
>
> Hi Benjamin!
>
> You can use /dev/mdio* devices for reading/writing MII registers.
> E.g.
>   md -s /dev/mdio0-phy00
>   mw -d /dev/mdio0-phy00 -w 0 0x12345678
>
> Just after barebox boot there is no /dev/mdio* devices.
> After network interface initialization (e.g. after ifup command) or
> after miitool command  the /dev/mdio* devices appear.
>

Adding to that, if you device doesn't have register layout detectable
by MII bus probe algorithm an arbitrary phydev can be forcefully
created using

  miitool -r <busno>:<addr>

Comes really handy when dealing with something other than PHY devices
(e.g reading switch registers).

Thanks,
Andrey Smirnov

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