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hwmon: Add xgene hwmon driver

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This patch adds hardware temperature and power reading support for
APM X-Gene SoC using the mailbox communication interface.

Signed-off-by: Hoan Tran <[email protected]>
Reviewed-by: Guenter Roeck <[email protected]>
Signed-off-by: Guenter Roeck <[email protected]>
This commit is contained in:
hotran 2016-07-21 15:37:32 -07:00 • committed by Guenter Roeck
commit ed42cfa881
4 changed files with 793 additions and 0 deletions
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Kernel driver xgene-hwmon
========================
Supported chips:
* APM X-Gene SoC
Description
-----------
This driver adds hardware temperature and power reading support for
APM X-Gene SoC using the mailbox communication interface.
For device tree, it is the standard DT mailbox.
For ACPI, it is the PCC mailbox.
The following sensors are supported
* Temperature
- SoC on-die temperature in milli-degree C
- Alarm when high/over temperature occurs
* Power
- CPU power in uW
- IO power in uW
sysfs-Interface
---------------
temp0_input - SoC on-die temperature (milli-degree C)
temp0_critical_alarm - An 1 would indicates on-die temperature exceeded threshold
power0_input - CPU power in (uW)
power1_input - IO power in (uW)