Calling i2c set speed twice for i2c_mux_bus

Simon Glass sjg at
Thu Apr 9 18:25:49 CEST 2020

Hi Michal,

On Thu, 9 Apr 2020 at 08:03, Michal Simek <michal.simek at> wrote:
> Hi Heiko and Simon,
> I have find out one bug in i2c class. I am using zcu104 revC board which
> has dts in mainline where i2c1 has i2c mux with some channels.
> In DT clock-frequency = <400000>; is specified and it is read in
> i2c_post_probe(). But i2c_mux_bus_drv is also UCLASS_I2C which means
> that post probe is called for it too. And because clock-frequency
> property is not there default 100k is used.
> I think that is bug and should be fixed.
> Heiko: Are you aware about this issue?
> Simon: I think that make sense to use some flags to skip calling
> post_probe in this case. Or any suggestion how to fix it would be great.

Ick, hope not. Can you please point me to the board config and the device tree?


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