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The Gateworks System Controller has a hwmon sub-component that exposes up to 16 ADC's, some of which are temperature sensors, others which are voltage inputs. The ADC configuration (register mapping and name) is configured via device-tree and varies board to board. Signed-off-by: Tim Harvey <tharvey@gateworks.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Lee Jones <lee.jones@linaro.org>
53 lines
1.7 KiB
ReStructuredText
53 lines
1.7 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
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Kernel driver gsc-hwmon
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=======================
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Supported chips: Gateworks GSC
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Datasheet: http://trac.gateworks.com/wiki/gsc
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Author: Tim Harvey <tharvey@gateworks.com>
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Description:
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------------
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This driver supports hardware monitoring for the temperature sensor,
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various ADC's connected to the GSC, and optional FAN controller available
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on some boards.
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Voltage Monitoring
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------------------
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The voltage inputs are scaled either internally or by the driver depending
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on the GSC version and firmware. The values returned by the driver do not need
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further scaling. The voltage input labels provide the voltage rail name:
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inX_input Measured voltage (mV).
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inX_label Name of voltage rail.
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Temperature Monitoring
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----------------------
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Temperatures are measured with 12-bit or 10-bit resolution and are scaled
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either internally or by the driver depending on the GSC version and firmware.
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The values returned by the driver reflect millidegree Celcius:
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tempX_input Measured temperature.
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tempX_label Name of temperature input.
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PWM Output Control
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------------------
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The GSC features 1 PWM output that operates in automatic mode where the
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PWM value will be scalled depending on 6 temperature boundaries.
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The tempeature boundaries are read-write and in millidegree Celcius and the
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read-only PWM values range from 0 (off) to 255 (full speed).
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Fan speed will be set to minimum (off) when the temperature sensor reads
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less than pwm1_auto_point1_temp and maximum when the temperature sensor
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equals or exceeds pwm1_auto_point6_temp.
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pwm1_auto_point[1-6]_pwm PWM value.
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pwm1_auto_point[1-6]_temp Temperature boundary.
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