46 lines
1.5 KiB
Plaintext
46 lines
1.5 KiB
Plaintext
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STMicroelectronics STi family Sysconfig Peripheral Powerdown Reset Controller
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=============================================================================
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This binding describes a reset controller device that is used to enable and
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disable on-chip peripheral controllers such as USB and SATA, using
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"powerdown" control bits found in the STi family SoC system configuration
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registers. These have been grouped together into a single reset controller
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device for convenience.
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The actual action taken when powerdown is asserted is hardware dependent.
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However, when asserted it may not be possible to access the hardware's
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registers and after an assert/deassert sequence the hardware's previous state
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may no longer be valid.
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Please refer to reset.txt in this directory for common reset
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controller binding usage.
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Required properties:
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- compatible: Should be "st,stih407-powerdown"
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- #reset-cells: 1, see below
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example:
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powerdown: powerdown-controller {
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compatible = "st,stih407-powerdown";
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#reset-cells = <1>;
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};
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Specifying powerdown control of devices
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=======================================
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Device nodes should specify the reset channel required in their "resets"
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property, containing a phandle to the powerdown device node and an
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index specifying which channel to use, as described in reset.txt
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example:
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st_dwc3: dwc3@8f94000 {
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resets = <&powerdown STIH407_USB3_POWERDOWN>,
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};
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Macro definitions for the supported reset channels can be found in:
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include/dt-bindings/reset/stih407-resets.h
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