Messages in this thread | | | Date | Wed, 20 Aug 2014 13:42:31 +0100 | From | Mark Rutland <> | Subject | Re: [PATCH] i2c: designware: deduce speed mode from device tree setting |
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On Wed, Aug 20, 2014 at 01:36:18PM +0100, Wolfram Sang wrote: > > > + > > > + 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.
Sure. My complaint was that the driver would accept invalid values. That wasn't meant to be suggestion to use a property other than the standard clock-freqeuncy.
> > 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.
Cool. Sounds like we can use Romain's patch to handle this then.
Cheers, Mark.
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