| 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 |