Hello,
the ADS7950 has a register bit (called TI_ADS7950_CR_RANGE_5V in the
driver) that selects the input range. Depending on that bit the input
range is either [0 .. V_{REF}] or [0 .. 2 * V_{REF}].
The driver currently defaults to setting that bit, so the range is the
big one.
On a machine here however I know the input is in the smaller range and
I'd like to benefit from the higher resolution of the small range. I
wonder how to make this tunable. Should that be done using a firmware
property? ("single-input-range" vs. "double-input-range"? Or input-range
= <1> vs. input-range = <2> which better matches the data sheet that
calls the two modes "Range 1 (0 to V_{REF})" and "Range 2 (0 to
2xV_{REF})") Or should this be made tunable via sysfs? (E.g. by writing
to the scale property? Or a separate property?)
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | https://www.pengutronix.de/ |
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