media: intel/ipu6: add syscom interfaces between firmware and driver
Syscom is an inter-process(or) communication mechanism between an IPU and host. Syscom uses message queues for message exchange between IPU and host. Each message queue has its consumer and producer, host queue messages to firmware as the producer and then firmware to dequeue the messages as consumer and vice versa. IPU and host use shared registers or memory to reside the read and write indices which are updated by consumer and producer. Signed-off-by: Bingbu Cao <bingbu.cao@intel.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
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