1 Pistachio Reset Controller
2 =============================================================================
3
4 This binding describes a reset controller device that is used to enable and
5 disable individual IP blocks within the Pistachio SoC using "soft reset"
6 control bits found in the Pistachio SoC top level registers.
7
8 The actual action taken when soft reset is asserted is hardware dependent.
9 However, when asserted it may not be possible to access the hardware's
10 registers, and following an assert/deassert sequence the hardware's previous
11 state may no longer be valid.
12
13 Please refer to Documentation/devicetree/bindings/reset/reset.txt
14 for common reset controller binding usage.
15
16 Required properties:
17
18 - compatible: Contains "img,pistachio-reset"
19
20 - #reset-cells: Contains 1
21
22 Example:
23
24 cr_periph: clk@18148000 {
25 compatible = "img,pistachio-cr-periph", "syscon", "simple-mfd";
26 reg = <0x18148000 0x1000>;
27 clocks = <&clk_periph PERIPH_CLK_SYS>;
28 clock-names = "sys";
29 #clock-cells = <1>;
30
31 pistachio_reset: reset-controller {
32 compatible = "img,pistachio-reset";
33 #reset-cells = <1>;
34 };
35 };
36
37 Specifying reset control of devices
38 =======================================
39
40 Device nodes should specify the reset channel required in their "resets"
41 property, containing a phandle to the pistachio reset device node and an
42 index specifying which reset to use, as described in
43 Documentation/devicetree/bindings/reset/reset.txt.
44
45 Example:
46
47 spdif_out: spdif-out@18100d00 {
48 ...
49 resets = <&pistachio_reset PISTACHIO_RESET_SPDIF_OUT>;
50 reset-names = "rst";
51 ...
52 };
53
54 Macro definitions for the supported resets can be found in:
55 include/dt-bindings/reset/pistachio-resets.h
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.