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