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Diffstat (limited to 'Documentation/devicetree/bindings/power/reset/keystone-reset.txt')
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diff --git a/Documentation/devicetree/bindings/power/reset/keystone-reset.txt b/Documentation/devicetree/bindings/power/reset/keystone-reset.txt new file mode 100644 index 000000000000..c82f12e2d85c --- /dev/null +++ b/Documentation/devicetree/bindings/power/reset/keystone-reset.txt | |||
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1 | * Device tree bindings for Texas Instruments keystone reset | ||
2 | |||
3 | This node is intended to allow SoC reset in case of software reset | ||
4 | of selected watchdogs. | ||
5 | |||
6 | The Keystone SoCs can contain up to 4 watchdog timers to reset | ||
7 | SoC. Each watchdog timer event input is connected to the Reset Mux | ||
8 | block. The Reset Mux block can be configured to cause reset or not. | ||
9 | |||
10 | Additionally soft or hard reset can be configured. | ||
11 | |||
12 | Required properties: | ||
13 | |||
14 | - compatible: ti,keystone-reset | ||
15 | |||
16 | - ti,syscon-pll: phandle/offset pair. The phandle to syscon used to | ||
17 | access pll controller registers and the offset to use | ||
18 | reset control registers. | ||
19 | |||
20 | - ti,syscon-dev: phandle/offset pair. The phandle to syscon used to | ||
21 | access device state control registers and the offset | ||
22 | in order to use mux block registers for all watchdogs. | ||
23 | |||
24 | Optional properties: | ||
25 | |||
26 | - ti,soft-reset: Boolean option indicating soft reset. | ||
27 | By default hard reset is used. | ||
28 | |||
29 | - ti,wdt-list: WDT list that can cause SoC reset. It's not related | ||
30 | to WDT driver, it's just needed to enable a SoC related | ||
31 | reset that's triggered by one of WDTs. The list is | ||
32 | in format: <0>, <2>; It can be in random order and | ||
33 | begins from 0 to 3, as keystone can contain up to 4 SoC | ||
34 | reset watchdogs and can be in random order. | ||
35 | |||
36 | Example 1: | ||
37 | Setup keystone reset so that in case software reset or | ||
38 | WDT0 is triggered it issues hard reset for SoC. | ||
39 | |||
40 | pllctrl: pll-controller@02310000 { | ||
41 | compatible = "ti,keystone-pllctrl", "syscon"; | ||
42 | reg = <0x02310000 0x200>; | ||
43 | }; | ||
44 | |||
45 | devctrl: device-state-control@02620000 { | ||
46 | compatible = "ti,keystone-devctrl", "syscon"; | ||
47 | reg = <0x02620000 0x1000>; | ||
48 | }; | ||
49 | |||
50 | rstctrl: reset-controller { | ||
51 | compatible = "ti,keystone-reset"; | ||
52 | ti,syscon-pll = <&pllctrl 0xe4>; | ||
53 | ti,syscon-dev = <&devctrl 0x328>; | ||
54 | ti,wdt-list = <0>; | ||
55 | }; | ||
56 | |||
57 | Example 2: | ||
58 | Setup keystone reset so that in case of software reset or | ||
59 | WDT0 or WDT2 is triggered it issues soft reset for SoC. | ||
60 | |||
61 | rstctrl: reset-controller { | ||
62 | compatible = "ti,keystone-reset"; | ||
63 | ti,syscon-pll = <&pllctrl 0xe4>; | ||
64 | ti,syscon-dev = <&devctrl 0x328>; | ||
65 | ti,wdt-list = <0>, <2>; | ||
66 | ti,soft-reset; | ||
67 | }; | ||