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A PRU system event "vring" has been added to each PRU and RTU node in each of the ICSSG0, ICSSG1 and ICSSG2 remote processor subsystems to enable the virtio/rpmsg communication between MPU and that PRU/RTU core. The additions are done in the base k3-am65-main.dtsi, and so are inherited by all the K3 AM65x boards. The PRU system events is the preferred approach over using TI mailboxes, as it eliminates an external peripheral access from the PRU/RTU-side, and keeps the interrupt generation internal to the ICSSG. The difference from MPU would be minimal in using one versus the other. Mailboxes can still be used if desired, but currently there is no support on firmware-side for K3 SoCs to use mailboxes. Either approach would require that an appropriate firmware image is loaded/booted on the PRU. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com> Acked-by: Ravi Gunasekaran <r-gunasekaran@ti.com> Signed-off-by: MD Danish Anwar <danishanwar@ti.com> Link: https://lore.kernel.org/r/20240529064420.571615-3-danishanwar@ti.com Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com> |
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