diff options
| author | Lars Randers <lranders@mail.dk> | 2026-06-29 10:30:59 +0100 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2026-08-10 08:59:40 -0700 |
| commit | ecc0eb5e95695ebfd7e51eecc65e80fff421cdcf (patch) | |
| tree | 931148767ca9bf4b56879ee28b6fa710eaa1ea99 /Documentation | |
| parent | 92ead3c1f17f7a94f72d672024ef2b1838f3f8de (diff) | |
hwmon: Driver for the temp/voltage sensor on PolarFire SoC
Add a driver for the temperature and voltage sensors on PolarFire SoC.
The temperature reports how hot the die is, and the voltages are the
SoC's 1.05, 1.8 and 2.5 volt rails respectively.
The hardware supports alarms in theory, but there is an erratum that
prevents clearing them once triggered, so no support is added for them.
The hardware measures voltage with 16 bits, of which 1 is a sign bit and
the remainder holds the voltage as a fixed point integer value. It's
improbable that the hardware will work if the voltages are negative, so
the driver ignores the sign bits.
There's no dt support etc here because this is the child of a simple-mfd
syscon.
Signed-off-by: Lars Randers <lranders@mail.dk>
Co-developed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20260629-wriggle-headscarf-c85a4070dddb@spud
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/hwmon/index.rst | 1 | ||||
| -rw-r--r-- | Documentation/hwmon/tvs-mpfs.rst | 53 |
2 files changed, 54 insertions, 0 deletions
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index 74d67fa21d19..226789376217 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -273,6 +273,7 @@ Hardware Monitoring Kernel Drivers tps53679 tps546d24 tsc1641 + tvs-mpfs twl4030-madc-hwmon ucd9000 ucd9200 diff --git a/Documentation/hwmon/tvs-mpfs.rst b/Documentation/hwmon/tvs-mpfs.rst new file mode 100644 index 000000000000..1035812f363a --- /dev/null +++ b/Documentation/hwmon/tvs-mpfs.rst @@ -0,0 +1,53 @@ +.. SPDX-License-Identifier: GPL-2.0 + +Kernel driver tvs-mpfs +====================== + +Supported chips: + + * PolarFire SoC + +Authors: + + - Conor Dooley <conor.dooley@microchip.com> + - Lars Randers <lranders@mail.dk> + +Description +----------- + +This driver implements support for the temperature and voltage sensors on +PolarFire SoC. The temperature reports how hot the die is, and the voltages are +the SoC's 1.05, 1.8 and 2.5 volt rails respectively. + + +Usage Notes +----------- + +update_interval has a permitted range of 0 to 8 milliseconds. + +Temperatures are read in millidegrees Celsius, but the hardware measures in +degrees Kelvin, storing the result as 11.4 fixed point data, for a maximum +value of 2047.9375 degrees Kelvin. + +Voltages are read in millivolts. The hardware measures in millivolts, storing +the value as 12.3 fixed point data, for a maximum of 4095.875 millivolts. +The minimum value reportable by the driver is 0 volts, although the hardware +is capable of measuring negative values. + +Sysfs entries +------------- + +The following attributes are supported. update_interval is read-write, as are +the enables. All other attributes are read only. + +======================= ==================================================== +temp1_label Fixed name for channel. +temp1_input Measured temperature for channel. +temp1_enable Enable/disable for channel. + +in[0-2]_label Fixed name for channel. +in[0-2]_input Measured voltage for channel. +in[0-2]_enable Enable/disable for channel. + +update_interval The interval at which the chip will update readings. +======================= ==================================================== |