[PATCH v3 2/3] hwmon: raspberrypi: Add voltage input support

[Guenter Roeck]

On Sun, May 17, 2026 at 01:34:44PM +0530, Shubham Chakraborty wrote:
> 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 at gmail.com>
> Reviewed-by: Florian Fainelli <florian.fainelli at broadcom.com>

Applied, after fixing:

WARNING: Missing a blank line after declarations
#207: FILE: drivers/hwmon/raspberrypi-hwmon.c:74:
+	int ret;
+	ret = rpi_firmware_property(data->fw, RPI_FIRMWARE_GET_VOLTAGE,

Please run checkpatch on your patches.

Thanks,
Guenter