On Wed, Apr 20, 2022 at 09:19:53AM -0700, Guenter Roeck wrote: > On 4/20/22 08:19, Benjamin Mugnier wrote: > [ ... ] > >> > >> It's the two most common use cases for imaging sensor temperature > >> measurements that I know of. My question to Benjamin is if he has the > >> same and/or other use cases. > >> > > > > Just like you said in a previous mail. This temperature sensor can > > be used to implement a retroactive loop from the host according to > > its value, such as noise correction for instance. > > We don't have anything in the Linux user space that implements this > > yet, this was in anticipation. > > So dropping it is fine, I will come back to it if need be ;) > > When you implement this in userspace, you might want to consider situations > where the temperature is _not_ reported via media controls (which might > at least in theory happen if the temperature sensor is not part of the > v4l device), or for existing drivers with hwmon support > (drivers/media/i2c/video-i2c.c comes into mind). That's a good point. I wouldn't expect external temperature sensors to be very useful for this use case though, as what we really need is the temperature of the camera sensor die. -- Regards, Laurent Pinchart
