63 lines
2.2 KiB
Plaintext
63 lines
2.2 KiB
Plaintext
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Texas Instruments System Control Interface (TI-SCI) Reset Controller
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=====================================================================
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Some TI SoCs contain a system controller (like the Power Management Micro
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Controller (PMMC) on Keystone 66AK2G SoC) that are responsible for controlling
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the state of the various hardware modules present on the SoC. Communication
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between the host processor running an OS and the system controller happens
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through a protocol called TI System Control Interface (TI-SCI protocol).
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For TI SCI details, please refer to the document,
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Documentation/devicetree/bindings/arm/keystone/ti,sci.txt
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TI-SCI Reset Controller Node
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============================
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This reset controller node uses the TI SCI protocol to perform the reset
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management of various hardware modules present on the SoC. Must be a child
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node of the associated TI-SCI system controller node.
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Required properties:
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--------------------
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- compatible : Should be "ti,sci-reset"
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- #reset-cells : Should be 2. Please see the reset consumer node below for
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usage details.
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TI-SCI Reset Consumer Nodes
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===========================
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Each of the reset consumer nodes should have the following properties,
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in addition to their own properties.
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Required properties:
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--------------------
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- resets : A phandle and reset specifier pair, one pair for each reset
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signal that affects the device, or that the device manages.
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The phandle should point to the TI-SCI reset controller node,
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and the reset specifier should have 2 cell-values. The first
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cell should contain the device ID. The second cell should
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contain the reset mask value used by system controller.
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Please refer to the protocol documentation for these values
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to be used for different devices,
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http://processors.wiki.ti.com/index.php/TISCI#66AK2G02_Data
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Please also refer to Documentation/devicetree/bindings/reset/reset.txt for
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common reset controller usage by consumers.
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Example:
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--------
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The following example demonstrates both a TI-SCI reset controller node and a
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consumer (a DSP device) on the 66AK2G SoC.
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pmmc: pmmc {
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compatible = "ti,k2g-sci";
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k2g_reset: reset-controller {
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compatible = "ti,sci-reset";
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#reset-cells = <2>;
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};
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};
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dsp0: dsp@10800000 {
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...
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resets = <&k2g_reset 0x0046 0x1>;
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...
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};
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