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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>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.