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The AM437x SoCs have two different PRU-ICSS subsystems: PRU-ICSS1 and a smaller PRU-ICSS0. Enhance the PRUSS platform driver to support both the PRU-ICSS sub-systems on these SoCs. The PRU-ICSS1 on AM437x is very similar to the PRU-ICSS on AM33xx except for few minor differences - increased Instruction RAM, increased Shared Data RAM2, and 1 less interrupt (PRUSS host interrupt 7 which is redirected to the other PRUSS) towards the MPU INTC. The PRU-ICSS0 is a cut-down version of the IP, with less DRAM per PRU, no Shared DRAM etc. It also does not have direct access to L3 bus regions, there is a single interface to L3 for both PRUSS0 and PRUSS1, and it would have to go through the PRUSS1's interface. The PRUSS_SYSCFG register is reserved on PRUSS0, so any external access requires the programming the corresponding PRUSS_SYSCFG register in PRUSS1. It does have its own dedicated I/O lines though. Note that this instance does not support any PRU Ethernet related use cases. The adaptation uses SoC-specific compatibles in the driver and uses a newly introduced pruss_match_private_data structure and the pruss_get_private_data() function to retrieve a PRUSS instance specific data using a device-name based lookup logic. The reset and the L3 external access are managed by the parent interconnect ti-sysc bus driver so that PRUSS1 and PRUSS0 can be independently supported. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Andrew F. Davis <afd@ti.com> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.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 Restructured Text 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.