David Gibson wrote:
> What does worry me, however, is the description says it's about
> whether the driver "should" enable the filter. Generally the device
> tree doesn't attempt to say what users "should" do with the hardware,
> just what the characteristics of the hardware are.
>
> What's the underlying difference here that affects the driver's choice
> to enable the filter or not?
I think it's a hardware/environment design parameter - e.g. if the I2C
bus has hot-pluggable devices, long PCB traces, or a hierarchy of
multiplexed bus segments, these can result in a noisy SCL signal that
needs to be filtered. It's also a recommended mitigation for errata
in certain CPU revs.
-=] Mike [=-
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