Re: [PATCH v2] hwmon: corsair-psu: add reporting of rail mode via debugfs

Guenter Roeck
2022-08-10T17:29:15Z

On 8/10/22 09:56, Wilken Gottwalt wrote:
> On Wed, 10 Aug 2022 09:31:21 -0700
> Guenter Roeck <linux@roeck-us.net> wrote:
>
>> On 8/10/22 06:53, Wilken Gottwalt wrote:
>>> Add reporting if the PSU is running in single or multi rail mode via
>>> ocpmode debugfs entry. Also update the documentation accordingly.
>>>
>>> Signed-off-by: Wilken Gottwalt <wilken.gottwalt@posteo.net>
>>> ---
>>> Changes in v2:
>>> - fixed spelling issues in commit message
>>
>> You did not address or even provide feedback on my second comment.
>
> Oh darn ... sorry, I was quite busy and didn't really pay attention. I will
> answer the earlier mail and think about it.
>
> Though, maybe you can help me with that what keeps me so busy. Would it be okay
> to use a kthread in a hwmon driver to do sampling (500ms - 10s) in conjunction
> with HWMON_C_UPDATE_INTERVAL, or is this a strict no-no? I know it is actually
> used to set a sample/update rate in a sensor (-register), but this USB-HID
> approach is a pure polling thing. It seems to work quite and enables the driver
> to collect data quite early in the boot process.
>

It really depends. Is it _necessary_ ? The pwm-fan driver uses a timer for
periodic polling, but that is because it has to. We should not do it purely
for convenience, and from the code I don't immediately see why it would
be necessary.

Guenter