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- STMicroelectronics STi family Sysconfig Peripheral Powerdown Reset Controller
- =============================================================================
- This binding describes a reset controller device that is used to enable and
- disable on-chip peripheral controllers such as USB and SATA, using
- "powerdown" control bits found in the STi family SoC system configuration
- registers. These have been grouped together into a single reset controller
- device for convenience.
- The actual action taken when powerdown is asserted is hardware dependent.
- However, when asserted it may not be possible to access the hardware's
- registers and after an assert/deassert sequence the hardware's previous state
- may no longer be valid.
- Please refer to reset.txt in this directory for common reset
- controller binding usage.
- Required properties:
- - compatible: Should be "st,<chip>-powerdown"
- ex: "st,stih415-powerdown", "st,stih416-powerdown"
- - #reset-cells: 1, see below
- example:
- powerdown: powerdown-controller {
- #reset-cells = <1>;
- compatible = "st,stih415-powerdown";
- };
- Specifying powerdown control of devices
- =======================================
- Device nodes should specify the reset channel required in their "resets"
- property, containing a phandle to the powerdown device node and an
- index specifying which channel to use, as described in reset.txt
- example:
- usb1: usb@fe200000 {
- resets = <&powerdown STIH41X_USB1_POWERDOWN>;
- };
- Macro definitions for the supported reset channels can be found in:
- include/dt-bindings/reset/stih415-resets.h
- include/dt-bindings/reset/stih416-resets.h
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