From 4b171b3d3bdf256b0d75a6b3430d8b73134b1bf7 Mon Sep 17 00:00:00 2001 From: Peter Griffin Date: Wed, 2 Jul 2014 15:08:47 +0100 Subject: reset: sti: Document sti-picophyreset controllers bindings. Add DT bindings documentation for sti-picophyreset controller. Signed-off-by: Peter Griffin Acked-by: Lee Jones Signed-off-by: Maxime Coquelin --- .../bindings/reset/st,sti-picophyreset.txt | 42 ++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 Documentation/devicetree/bindings/reset/st,sti-picophyreset.txt diff --git a/Documentation/devicetree/bindings/reset/st,sti-picophyreset.txt b/Documentation/devicetree/bindings/reset/st,sti-picophyreset.txt new file mode 100644 index 000000000000..54ae9f747e45 --- /dev/null +++ b/Documentation/devicetree/bindings/reset/st,sti-picophyreset.txt @@ -0,0 +1,42 @@ +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 -- cgit v1.2.3-59-g8ed1b