diff options
| author | Shubham Chakraborty <chakrabortyshubham66@gmail.com> | 2026-05-17 13:34:44 +0530 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2026-06-09 08:23:00 -0700 |
| commit | 78a3e36eec06a0dc4a205c753e7754e9f9408fba (patch) | |
| tree | 3100eb79799281fe8bd47a8bd1837d8c2fa7e53f /Documentation/hwmon | |
| parent | 3b7f59ffacb131037f592d3a4a7342c6773249a4 (diff) | |
| download | linux-next-78a3e36eec06a0dc4a205c753e7754e9f9408fba.tar.gz linux-next-78a3e36eec06a0dc4a205c753e7754e9f9408fba.zip | |
hwmon: (raspberrypi) Add voltage input support
Extend the raspberrypi-hwmon driver to expose firmware-provided
voltage measurements through the hwmon subsystem.
The driver now exports the following voltage inputs:
- in0_input (core)
- in1_input (sdram_c)
- in2_input (sdram_i)
- in3_input (sdram_p)
Voltage values returned by firmware are converted from microvolts
to millivolts as expected by the hwmon subsystem.
Update the documentation related to it.
The existing undervoltage sticky alarm handling is preserved and
associated with the first voltage channel.
Tested in -
- Raspberry Pi 3b+ (Linux raspberrypi 6.12.75+rpt-rpi-v8 #1 SMP PREEMPT
Debian 1:6.12.75-1+rpt1 (2026-03-11) aarch64 GNU/Linux)
Signed-off-by: Shubham Chakraborty <chakrabortyshubham66@gmail.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://lore.kernel.org/r/20260517080445.103962-3-chakrabortyshubham66@gmail.com
[groeck: Added missing empty line after declaration]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'Documentation/hwmon')
| -rw-r--r-- | Documentation/hwmon/raspberrypi-hwmon.rst | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/Documentation/hwmon/raspberrypi-hwmon.rst b/Documentation/hwmon/raspberrypi-hwmon.rst index 8038ade36490..db315184b861 100644 --- a/Documentation/hwmon/raspberrypi-hwmon.rst +++ b/Documentation/hwmon/raspberrypi-hwmon.rst @@ -20,6 +20,17 @@ undervoltage conditions. Sysfs entries ------------- -======================= ================== +======================= ====================================================== +in0_input Core voltage in millivolts +in1_input SDRAM controller voltage in millivolts +in2_input SDRAM I/O voltage in millivolts +in3_input SDRAM PHY voltage in millivolts +in0_label "core" +in1_label "sdram_c" +in2_label "sdram_i" +in3_label "sdram_p" in0_lcrit_alarm Undervoltage alarm -======================= ================== +======================= ====================================================== + +The voltage inputs and labels are only exposed if the firmware reports support +for the corresponding voltage ID. |