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hwmon: (max31827) Modify conversion wait time

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There is nothing in the datasheet indicating that the 1ms error is
needed and I didn't encounter any error during testing with 140ms wait
time.

Signed-off-by: Daniel Matyas <daniel.matyas@analog.com>
Link: https://lore.kernel.org/r/20230919093456.10592-2-daniel.matyas@analog.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Daniel Matyas 2023-09-19 12:34:50 +03:00 committed by Guenter Roeck
parent 9ca6696718
commit 8824557037
2 changed files with 3 additions and 3 deletions
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4
Documentation/hwmon/max31827.rst
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@ -73,8 +73,8 @@ the conversion frequency to 1 conv/s. The conversion time varies depending on
the resolution. The conversion time doubles with every bit of increased
resolution. For 10 bit resolution 35ms are needed, while for 12 bit resolution
(default) 140ms. When chip is in shutdown mode and a read operation is
requested, one-shot is triggered, the device waits for 140 (conversion time) + 1
(error) ms, and only after that is the temperature value register read.
requested, one-shot is triggered, the device waits for 140 (conversion time) ms,
and only after that is the temperature value register read.
The LSB of the temperature values is 0.0625 degrees Celsius, but the values of
the temperatures are displayed in milli-degrees. This means, that some data is

2
drivers/hwmon/max31827.c
View File

@ -25,7 +25,7 @@
#define MAX31827_CONFIGURATION_U_TEMP_STAT_MASK BIT(14)
#define MAX31827_CONFIGURATION_O_TEMP_STAT_MASK BIT(15)
#define MAX31827_12_BIT_CNV_TIME 141
#define MAX31827_12_BIT_CNV_TIME 140
#define MAX31827_16_BIT_TO_M_DGR(x) (sign_extend32(x, 15) * 1000 / 16)
#define MAX31827_M_DGR_TO_16_BIT(x) (((x) << 4) / 1000)