* Roger Quadros <rogerq@xxxxxx> [190204 14:23]: > From: "Andrew F. Davis" <afd@xxxxxx> > > The Programmable Real-Time Unit Subsystem (PRUSS) contains an > interrupt controller (INTC) that can handle various system input > events and post interrupts back to the device-level initiators. > The INTC can support upto 64 input events with individual control > configuration and hardware prioritization. These events are mapped > onto 10 interrupt signals through two levels of many-to-one mapping > support. Different interrupt signals are routed to the individual > PRU cores or to the host CPU. > > The PRUSS INTC platform driver manages this PRUSS interrupt > controller and implements an irqchip driver to provide a Linux > standard way for the PRU client users to enable/disable/ack/ > re-trigger a PRUSS system event. The system events to interrupt > channels and host interrupts relies on the mapping configuration > provided through a firmware resource table for now. This will be > revisited and enhanced in the future for a better interface. The > mappings will currently be programmed during the boot/shutdown > of the PRU. > > The PRUSS INTC module is reference counted during the interrupt > setup phase through the irqchip's irq_request_resources() and > irq_release_resources() ops. This restricts the module from being > removed as long as there are active interrupt users. > > The PRUSS INTC can generate an interrupt to various processor > subsystems on the SoC through a set of 64 possible PRU system > events. These system events can be used by PRU client drivers > or applications for event notifications/signalling between PRUs > and MPU or other processors. An API, pruss_intc_trigger() is > provided to MPU-side PRU client drivers/applications to be able > to trigger an event/interrupt using IRQ numbers provided by the > PRUSS-INTC irqdomain chip. I suggest you send the binding patch and the interrupt controller driver separately to the irqchip guys. Maybe put the trigger function in to a separate patch that can be reviewed and applied separately. Regards, Tony
