On Wed, Aug 28, 2019 at 11:01:21AM +0000, Shuming [范書銘] wrote: > > > ADCDAT pin config sets to output mode in default. > > > And the driver creates the kcontrol to control ADCDAT pin configuration. > > Why would this change at runtime? I'd expect this to be controlled by the > > machine driver or a DT property. > It will not change at runtime in the normal case. > I think we may use it to test the feedback signal in factory mode. So really this is setting up a loopback for testing?
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