Apple tv

HDMI-CEC can make it so that when you wake the Apple TV, that in turn wakes the TV and switches to the corresponding HDMI input.

HDMI-CEC should be activated on all connected HDMI devices. Your TV brand may have a brand specific marketing name for HDMI-CEC. On Apple TV, HDMI-CEC can be activated as described in Control your TV or receiver with your Siri Remote or Apple TV Remote - Apple Support

hdmi connected devices can't force that as it would pose a problems with several devices would attempt this at once

so if your tv does not offer some default start up input source then you can't