Commits
Suman Anna committed 19403e1307e
remoteproc/pru: Add support for virtio rpmsg stack The PRU remoteproc driver has been enhanced to support the optional rpmsg stack using the virtio-ring based communication transport between MPU and a PRU core. This provides support to any firmware images supporting the virtio devices. The virtio-ring signalling support is provided either through a OMAP mailbox or through two PRU system events on OMAP-architecture based SoCs - one event used in each direction for kicking from one processor and receiving notification on the other processor. The virtio rpmsg signalling is enabled only using using PRU system events for interrupts on the Keystone-architecture based 66AK2G SoCs (it is possible to implement using an alternate Keystone specific IPCGR registers as well). The driver supports both signalling options, though the PRU events based signalling is the recommended option as it avoids an external peripheral access from the PRU side. It also provides an uniform solution across all the OMAP, Keystone and Davinci architectures. The PRU events based signalling takes precedence if both options are mentioned. Either of the options would require the corresponding firmware support though. A build dependency against MAILBOX is also added. Note that the OMAP Mailbox IP is not present on 66AK2G and Davinci SoCs, so it is only selected for OMAP-based SoCs. Signed-off-by: Suman Anna <s-anna@ti.com>