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| /openbmc/u-boot/drivers/thermal/ |
| H A D | imx_thermal.c | 4fac4171 Tue Apr 18 07:41:52 CDT 2017 Peng Fan <peng.fan@nxp.com> imx: thermal: update imx6 thermal driver according new equation
>From IC guys:
"
After a thorough accuracy study of the Temp sense circuit,
we found that with our current equation, an average part can
read 7 degrees lower than a known forced temperature.
We also found out that the standard variance was around 2C;
which is the tightest distribution that we could create.
We need to change the temp sense equation to center the average
part around the target temperature.
"
New equation:
Tmeas = (Nmeas - n1) / slope + t1 + offset
n1= fused room count
t1= 25
offset=3.580661
slope= 0.4148468 – 0.0015423*n1
According the new equation, update the thermal driver.
c1 and c2 changed to u64 type and update comments.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
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