Hi Laurent, On Mon, Mar 20, 2023 at 11:26:02AM +0200, Laurent Pinchart wrote: > In a (simplified) nutshell, > > ---------+ +----------+ +---------+ +-----+ +-----+ > | Camera | --> | CSI-2 RX | --> | CSI2IPU | --> | Mux | --> | IPU | > | Sensor | | | | Gasket | | | | | > ---------+ +----------+ +---------+ +-----+ +-----+ Thank you, this is helpful. I suppose the mux here at least won't actively do anything to the data. So presumably its endpoint won't contain the active configuration, but its superset. > > All those blocks, except for the gasket, have a node in DT. > > The IPU driver needs to know the number of CSI-2 data lanes, which is > encoded in the data-lanes DT property present in both the sensor output > endpoint and the CSI-2 RX input endpoint, but not the other endpoints in > the pipeline. This doesn't yet explain why the sensor would need to implement get_mbus_config if its bus configuration remains constant. I suppose those blocks in between would probably need something to convey their active configuration from upstream sub-devices. -- Kind regards, Sakari Ailus
