ti,sci-reset.txt 1.7 KB

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  1. Texas Instruments TI SCI Reset Controller
  2. =========================================
  3. Some TI SoCs contain a system controller (like the SYSFW, etc...) that is
  4. responsible for controlling the state of the IPs that are present.
  5. Communication between the host processor running an OS and the system
  6. controller happens through a protocol known as TI SCI [1].
  7. [1] http://processors.wiki.ti.com/index.php/TISCI
  8. Reset Controller Node
  9. =====================
  10. The reset controller node represents the resets of various hardware modules
  11. present on the SoC managed by the SYSFW. Because this relies on the TI SCI
  12. protocol to communicate with the SYSFW it must be a child of the sysfw node.
  13. Required Properties:
  14. --------------------
  15. - compatible: Must be "ti,sci-reset"
  16. - #reset-cells: Must be 2. Please see the reset consumer node below for
  17. usage details.
  18. Example (AM65x):
  19. ----------------
  20. sysfw: sysfw {
  21. compatible = "ti,am654-system-controller";
  22. ...
  23. k3_reset: reset-controller {
  24. compatible = "ti,sci-reset";
  25. #reset-cells = <2>;
  26. };
  27. };
  28. Reset Consumers
  29. ===============
  30. Each of the reset consumer nodes should have the following properties,
  31. in addition to their own properties.
  32. Required Properties:
  33. --------------------
  34. - resets: A phandle and reset specifier pair, one pair for each reset signal
  35. that affects the device, or that the device manages. The phandle
  36. should point to the TI SCI reset controller node, and the reset
  37. specifier should have 2 cell-values. The first cell should contain
  38. the device ID. The second cell should contain the reset mask value
  39. used by system controller.
  40. Example (AM65x):
  41. ----------------
  42. uart2: serial@02800000 {
  43. compatible = "ti,omap4-uart";
  44. ...
  45. resets = <&k3_reset 5 1>;
  46. };