43 строки
1.4 KiB
Plaintext
43 строки
1.4 KiB
Plaintext
STMicroelectronics STi family Sysconfig Picophy SoftReset Controller
|
|
=============================================================================
|
|
|
|
This binding describes a reset controller device that is used to enable and
|
|
disable on-chip PicoPHY USB2 phy(s) using "softreset" control bits found in
|
|
the STi family SoC system configuration registers.
|
|
|
|
The actual action taken when softreset 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 Documentation/devicetree/bindings/reset/reset.txt
|
|
for common reset controller binding usage.
|
|
|
|
Required properties:
|
|
- compatible: Should be "st,stih407-picophyreset"
|
|
- #reset-cells: 1, see below
|
|
|
|
Example:
|
|
|
|
picophyreset: picophyreset-controller {
|
|
compatible = "st,stih407-picophyreset";
|
|
#reset-cells = <1>;
|
|
};
|
|
|
|
Specifying picophyreset control of devices
|
|
=======================================
|
|
|
|
Device nodes should specify the reset channel required in their "resets"
|
|
property, containing a phandle to the picophyreset device node and an
|
|
index specifying which channel to use, as described in
|
|
Documentation/devicetree/bindings/reset/reset.txt.
|
|
|
|
Example:
|
|
|
|
usb2_picophy0: usbpicophy@0 {
|
|
resets = <&picophyreset STIH407_PICOPHY0_RESET>;
|
|
};
|
|
|
|
Macro definitions for the supported reset channels can be found in:
|
|
include/dt-bindings/reset-controller/stih407-resets.h
|