On 2/9/2022 4:30 PM, Mike Jones wrote:
> The journal shows an I2C error: Device or resource busy. Does hwmon 
> lock out phosphor-regulators if it uses the same address? Sent from my 
> iPad On Feb 1, 2022, at 10:38 AM, Shawn McCarney 
> <shawnmm@linux.ibm.com> wrote:  ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ 
> 
> The journal shows an I2C error: Device or resource busy.
>
> Does hwmon lock out phosphor-regulators if it uses the same address?
>
phosphor-regulators currently communicates directly with voltage 
regulators using i2c-dev; it does not use device drivers.

The reason is that most regulator drivers provide either no or very 
limited ability to configure regulators.  For the systems I work on, we 
need to do extensive regulator configuration to fine tune things (output 
voltage, pgood min/max, timing, etc.) Redundant phase fault detection is 
also pretty device-specific and on involves communicating with multiple 
devices.

I have not tested using phosphor-regulators when a driver is bound to 
the regulator, but I suspect you may be right.  I assume hwmon is using 
read sensor data from a driver, and the driver being bound is stopping 
the phosphor-regulators read from succeeding.

Thanks,

Shawn