Re: [PATCH] i2c: designware: deduce speed mode from device tree setting

[Wolfram Sang]

> > +
> > +		ret = of_property_read_u32(pdev->dev.of_node,
> > +					   "clock-frequency", &bus_rate);
> > +		if (!ret && (bus_rate <= 100000))
> > +			speed = DW_IC_CON_SPEED_STD;
> 
> This looks a bit odd.
> 
> If the device only supports two particular speeds why do we accept any
> other speed in the clock-frequency property?

"clock-frequency" is the default binding for specifying i2c bus speeds
today. Some controllers can be programmed to do various speeds, some can
only do a set of fixed values.

> Surely we should at least warn that something was off?

Yes, I was going to say the same until Romain's old patch showed up
which does that.

Thanks,

   Wolfram

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