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Documentation / devicetree / bindings / bus / simple-pm-bus.txt


Based on kernel version 4.16.1. Page generated on 2018-04-09 11:52 EST.

1	Simple Power-Managed Bus
2	========================
3	
4	A Simple Power-Managed Bus is a transparent bus that doesn't need a real
5	driver, as it's typically initialized by the boot loader.
6	
7	However, its bus controller is part of a PM domain, or under the control of a
8	functional clock.  Hence, the bus controller's PM domain and/or clock must be
9	enabled for child devices connected to the bus (either on-SoC or externally)
10	to function.
11	
12	While "simple-pm-bus" follows the "simple-bus" set of properties, as specified
13	in the Devicetree Specification, it is not an extension of "simple-bus".
14	
15	
16	Required properties:
17	  - compatible: Must contain at least "simple-pm-bus".
18			Must not contain "simple-bus".
19			It's recommended to let this be preceded by one or more
20			vendor-specific compatible values.
21	  - #address-cells, #size-cells, ranges: Must describe the mapping between
22			parent address and child address spaces.
23	
24	Optional platform-specific properties for clock or PM domain control (at least
25	one of them is required):
26	  - clocks: Must contain a reference to the functional clock(s),
27	  - power-domains: Must contain a reference to the PM domain.
28	Please refer to the binding documentation for the clock and/or PM domain
29	providers for more details.
30	
31	
32	Example:
33	
34		bsc: bus@fec10000 {
35			compatible = "renesas,bsc-sh73a0", "renesas,bsc",
36				     "simple-pm-bus";
37			#address-cells = <1>;
38			#size-cells = <1>;
39			ranges = <0 0 0x20000000>;
40			reg = <0xfec10000 0x400>;
41			interrupts = <0 39 IRQ_TYPE_LEVEL_HIGH>;
42			clocks = <&zb_clk>;
43			power-domains = <&pd_a4s>;
44		};
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