[PATCH v2] iio: adc: xilinx-xadc: Fix sequencer mode in postdisable for dual mux

[Andy Shevchenko]

On Wed, Mar 04, 2026 at 10:07:27AM +0100, Christofer Jonason wrote:
> xadc_postdisable() unconditionally sets the sequencer to continuous
> mode. For dual external multiplexer configurations this is incorrect:
> simultaneous sampling mode is required so that ADC-A samples through
> the mux on VAUX[0-7] while ADC-B simultaneously samples through the
> mux on VAUX[8-15]. In continuous mode only ADC-A is active, so
> VAUX[8-15] channels return incorrect data.
> 
> Since postdisable is also called from xadc_probe() to set the initial
> idle state, the wrong sequencer mode is active from the moment the
> driver loads.
> 
> The preenable path already uses xadc_get_seq_mode() which returns
> SIMULTANEOUS for dual mux. Fix postdisable to do the same.

Reviewed-by: Andy Shevchenko <andriy.shevchenko at intel.com>

-- 
With Best Regards,
Andy Shevchenko