| Commit message (Collapse) | Author | Age | Lines |
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From temp sensor guys:
"
I confirmed the math with him(had do the accuracy study) today.
The new, final equation is:
Tmeas = (Nmeas - n1) / slope + t1 + offset
n1= fused room count
t1= 25
offset=3.580661
slope= 0.4148468 – 0.0015423*n1
"
87723f903454aaf17336e0fe9098ea7911c19f3c update the thermal with not
accurate slope parameters. This patch fix it.
Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
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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.
Old Equation:
Temp = Troom,cal – slope*(Count measured – Count room fuse)
Where
Troom,cal = 25C and
Slope = 0.4297157 – (0.0015974 * Count room fuse)
New Equation:
Temp = Troom,cal – slope*(Count measured – Count room fuse) +offset
Where
Troom,cal = 25C and
Slope = 0.4445388 – (0.0016549 * Count room fuse)
Offset = 3.580661
"
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@freescale.com>
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Fix reading temperature.
Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
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Add thermal driver for mx7
Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
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Change macro name to make driver support more platforms.
Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
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This patch is from commit c83c6cc7dedf9759bf193044ff5c3572d5f6afd2
Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Signed-off-by: Ye.Li <B37916@freescale.com>
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Expand the help messages for each driver. Add missing Kconfig for I2C,
SPI flash and thermal.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
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Printing the calibration data on every boot does not provide really useful
information:
U-Boot 2015.01-rc1-18266-ge7eb277 (Nov 24 2014 - 11:29:51)
CPU: Freescale i.MX6Q rev1.2 at 792 MHz
CPU: Thermal calibration data: 0x5d85067d
CPU: Temperature 33 C
Reset cause: POR
Board: MX6-SabreSD
Do not display the calibration data in order to have a cleaner boot log.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
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Add a new thermal uclass for thermal sensor and implement the imx
thermal driver basing on this uclass.
Signed-off-by: Ye.Li <B37916@freescale.com>
Acked-by: Stefano Babic <sbabic@denx.de>
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