1* CoreSight CPU Debug Component:
2
3CoreSight CPU debug component are compliant with the ARMv8 architecture
4reference manual (ARM DDI 0487A.k) Chapter 'Part H: External debug'. The
5external debug module is mainly used for two modes: self-hosted debug and
6external debug, and it can be accessed from mmio region from Coresight
7and eventually the debug module connects with CPU for debugging. And the
8debug module provides sample-based profiling extension, which can be used
9to sample CPU program counter, secure state and exception level, etc;
10usually every CPU has one dedicated debug module to be connected.
11
12Required properties:
13
14- compatible : should be "arm,coresight-cpu-debug"; supplemented with
15               "arm,primecell" since this driver is using the AMBA bus
16	       interface.
17
18- reg : physical base address and length of the register set.
19
20- clocks : the clock associated to this component.
21
22- clock-names : the name of the clock referenced by the code. Since we are
23                using the AMBA framework, the name of the clock providing
24		the interconnect should be "apb_pclk" and the clock is
25		mandatory. The interface between the debug logic and the
26		processor core is clocked by the internal CPU clock, so it
27		is enabled with CPU clock by default.
28
29- cpu : the CPU phandle the debug module is affined to. When omitted
30	the module is considered to belong to CPU0.
31
32Optional properties:
33
34- power-domains: a phandle to the debug power domain. We use "power-domains"
35                 binding to turn on the debug logic if it has own dedicated
36		 power domain and if necessary to use "cpuidle.off=1" or
37		 "nohlt" in the kernel command line or sysfs node to
38		 constrain idle states to ensure registers in the CPU power
39		 domain are accessible.
40
41Example:
42
43	debug@f6590000 {
44		compatible = "arm,coresight-cpu-debug","arm,primecell";
45		reg = <0 0xf6590000 0 0x1000>;
46		clocks = <&sys_ctrl HI6220_DAPB_CLK>;
47		clock-names = "apb_pclk";
48		cpu = <&cpu0>;
49	};
50