On Fri, Nov 19, 2021 at 10:14:54PM +0300, Evgeny Boger wrote: > R40 SoC has touchscreen controller also serving as general-purpose ADC. > The hardware is very similar to A31, except that R40 has separate > calibrated thermal sensor IP (handled by sun8i_thermal). > > Despite the temperature sensor in the RTP is never mentioned in > the R40 family user manuals, it appears to be working. However, > it's not very useful as it lacks calibration data and there is another > fully functioning temperature sensor anyway. > > This patch disables the temperature sensor in RTP/GPADC IP on R40. > > The reason for disabling the temperature sensor is that the IP > needs to be switched back and forth between RTP and GPADC modes for > temperature measurements. Not only this introduces delays, but it also > disturbs external circuitry by injecting current into ADC inputs. > > Signed-off-by: Evgeny Boger <boger@xxxxxxxxxxxxxx> Acked-by: Maxime Ripard <maxime@xxxxxxxxxx> Maxime
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