TPS65950(TWL4030) paired with OMAP3 is used in devices such as Beagleboard and
Gumstix Overo COMs. Its ADCs from 3 to 6 seem to be broken [1][2][3].
The ADC readings for these pins are stuck at near 0v for these two reasons:
- 3v1 bias regulator (vusb3v1) is off unless USB-otg is being used
- pins are not configured to attach as ADC
This patch attempts to fix these issues by making sure 3v1 regulator is enabled
and pins are correctly configured as ADC inputs.
[1] http://comments.gmane.org/gmane.linux.ports.arm.omap/83698
[2] http://gumstix.8.x6.nabble.com/twl4030-madc-low-read-value-td4967139.html#none
[3] https://e2e.ti.com/support/power_management/pmu/f/43/t/732
Adam YH Lee (1):
[TWL4030 MADC] Fix ADC[3:6] readings
drivers/iio/adc/twl4030-madc.c | 14 ++++++++++++++
drivers/phy/phy-twl4030-usb.c | 7 +++++++
2 files changed, 21 insertions(+)
--
2.1.4
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