hwmon: Clarify autopwm trip points documentation
Document the case of hybrid automatic fan speed control implementations, where trip points are associated to both PWM output channels and temperature input channels. Signed-off-by: Jean Delvare <khali@linux-fr.org>
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@ -225,8 +225,6 @@ pwm[1-*]_auto_point[1-*]_temp_hyst
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to PWM output channels.
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RW
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OR
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temp[1-*]_auto_point[1-*]_pwm
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temp[1-*]_auto_point[1-*]_temp
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temp[1-*]_auto_point[1-*]_temp_hyst
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@ -235,6 +233,15 @@ temp[1-*]_auto_point[1-*]_temp_hyst
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to temperature channels.
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RW
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There is a third case where trip points are associated to both PWM output
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channels and temperature channels: the PWM values are associated to PWM
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output channels while the temperature values are associated to temperature
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channels. In that case, the result is determined by the mapping between
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temperature inputs and PWM outputs. When several temperature inputs are
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mapped to a given PWM output, this leads to several candidate PWM values.
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The actual result is up to the chip, but in general the highest candidate
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value (fastest fan speed) wins.
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****************
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* Temperatures *
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