[PATCH] Net: add mdio_i2c driver.

Sascha Hauer s.hauer at pengutronix.de
Fri Nov 17 01:06:58 PST 2017

On Fri, Nov 17, 2017 at 09:52:14AM +0100, Clément Leger wrote:
> Hi Sascha,
> Indeed, I though about that and I was facing another problem.
> The mdio to i2c driver does not have a specific address.
> ie, it is not a device but rather a bus.
> If I put the mdio_i2c  node under the i2c bus, then I should assign
> it an i2c address. This address should represent the phy address.
> However, this would means I would have one mdio-i2c driver per phy.

Some AT24 EEPROMs have the same problem, they also use multiple
addresses. AFAIK for them only the first address is provided in the
"reg" property. See drivers/eeprom/at24c.c how the driver handles this
Normally I think multi address devices should simply provide their
reg space as reg = <start size>; like other devices do aswell. I don't
know what the I2C core maked from this though.


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