mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-06 13:14:27 +00:00
77 lines
2.3 KiB
Text
77 lines
2.3 KiB
Text
|
Texas Instruments System Control Interface (TI-SCI) Message Protocol
|
||
|
|
--------------------------------------------------------------------
|
||
|
|
|
||
|
|
Texas Instrument's processors including those belonging to Keystone generation
|
||
|
|
of processors have separate hardware entity which is now responsible for the
|
||
|
|
management of the System on Chip (SoC) system. These include various system
|
||
|
|
level functions as well.
|
||
|
|
|
||
|
|
An example of such an SoC is K2G, which contains the system control hardware
|
||
|
|
block called Power Management Micro Controller (PMMC). This hardware block is
|
||
|
|
initialized early into boot process and provides services to Operating Systems
|
||
|
|
on multiple processors including ones running Linux.
|
||
|
|
|
||
|
|
See http://processors.wiki.ti.com/index.php/TISCI for protocol definition.
|
||
|
|
|
||
|
|
TI-SCI controller Device Node:
|
||
|
|
=============================
|
||
|
|
|
||
|
|
The TI-SCI node describes the Texas Instrument's System Controller entity node.
|
||
|
|
This parent node may optionally have additional children nodes which describe
|
||
|
|
specific functionality such as clocks, power domain, reset or additional
|
||
|
|
functionality as may be required for the SoC. This hierarchy also describes the
|
||
|
|
relationship between the TI-SCI parent node to the child node.
|
||
|
|
|
||
|
|
Required properties:
|
||
|
|
-------------------
|
||
|
|
- compatible: should be "ti,k2g-sci"
|
||
|
|
- mbox-names:
|
||
|
|
"rx" - Mailbox corresponding to receive path
|
||
|
|
"tx" - Mailbox corresponding to transmit path
|
||
|
|
|
||
|
|
- mboxes: Mailboxes corresponding to the mbox-names. Each value of the mboxes
|
||
|
|
property should contain a phandle to the mailbox controller device
|
||
|
|
node and an args specifier that will be the phandle to the intended
|
||
|
|
sub-mailbox child node to be used for communication.
|
||
|
|
|
||
|
|
Optional Properties:
|
||
|
|
-------------------
|
||
|
|
- reg-names:
|
||
|
|
debug_messages - Map the Debug message region
|
||
|
|
- reg: register space corresponding to the debug_messages
|
||
|
|
- ti,system-reboot-controller: If system reboot can be triggered by SoC reboot
|
||
|
|
- ti,secure-host: If the host is defined as secure.
|
||
|
|
|
||
|
|
Example:
|
||
|
|
-------------
|
||
|
|
dmsc: dmsc {
|
||
|
|
compatible = "ti,k2g-sci";
|
||
|
|
ti,host-id = <12>;
|
||
|
|
#address-cells = <1>;
|
||
|
|
#size-cells = <1>;
|
||
|
|
ranges;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
TI-SCI Client Device Node:
|
||
|
|
=========================
|
||
|
|
|
||
|
|
Client nodes are maintained as children of the relevant TI-SCI device node.
|
||
|
|
|
||
|
|
Example:
|
||
|
|
-------------
|
||
|
|
dmsc: dmsc {
|
||
|
|
compatible = "ti,k2g-sci";
|
||
|
|
...
|
||
|
|
|
||
|
|
my_clk_node: clk_node {
|
||
|
|
...
|
||
|
|
...
|
||
|
|
};
|
||
|
|
|
||
|
|
my_pd_node: pd_node {
|
||
|
|
...
|
||
|
|
...
|
||
|
|
};
|
||
|
|
};
|