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fc58fcf6 SK |
1 | STMicroelectronics STi family Sysconfig Peripheral SoftReset Controller |
2 | ============================================================================= | |
3 | ||
4 | This binding describes a reset controller device that is used to enable and | |
5 | disable on-chip peripheral controllers such as USB and SATA, using | |
6 | "softreset" control bits found in the STi family SoC system configuration | |
7 | registers. | |
8 | ||
9 | The actual action taken when softreset is asserted is hardware dependent. | |
10 | However, when asserted it may not be possible to access the hardware's | |
11 | registers and after an assert/deassert sequence the hardware's previous state | |
12 | may no longer be valid. | |
13 | ||
14 | Please refer to reset.txt in this directory for common reset | |
15 | controller binding usage. | |
16 | ||
17 | Required properties: | |
18 | - compatible: Should be "st,<chip>-softreset" example: | |
19 | "st,stih415-softreset" or "st,stih416-softreset"; | |
20 | - #reset-cells: 1, see below | |
21 | ||
22 | example: | |
23 | ||
24 | softreset: softreset-controller { | |
25 | #reset-cells = <1>; | |
26 | compatible = "st,stih415-softreset"; | |
27 | }; | |
28 | ||
29 | ||
30 | Specifying softreset control of devices | |
31 | ======================================= | |
32 | ||
33 | Device nodes should specify the reset channel required in their "resets" | |
34 | property, containing a phandle to the softreset device node and an | |
35 | index specifying which channel to use, as described in reset.txt | |
36 | ||
37 | example: | |
38 | ||
39 | ethernet0{ | |
40 | resets = <&softreset STIH415_ETH0_SOFTRESET>; | |
41 | }; | |
42 | ||
43 | Macro definitions for the supported reset channels can be found in: | |
44 | ||
efdf5aa8 PZ |
45 | include/dt-bindings/reset/stih415-resets.h |
46 | include/dt-bindings/reset/stih416-resets.h |