[PATCHv5] staging/iio/adc: change the MXS touchscreen driver implementation

Lothar Waßmann LW at KARO-electronics.de
Mon Sep 23 13:40:18 UTC 2013


Jürgen Beisert writes:
> The i.MX28 manual says the LRADC delay unit is driven by a 2 kHz clock, but 
> does not say what kind of clock it is (or is derived from). I guess now, this 
> clock isn't enabled and thus the delay unit can't work. At least on the 
> MX28EVK. On your TX28 platform the clock seems enabled and the delay unit can 
> do its job and drive the state machine.
The i.MX28 Ref Manual states in chapter 38.5.14 LRADC Scheduling Delay:
| This counter operates on a 2KHz clock derived from crystal clock.
Thus the clock should always be enabled.

Lothar Waßmann

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