* CoreSight Components:

CoreSight components are compliant with the ARM CoreSight architecture
specification and can be connected in various topologies to suit a particular
SoCs tracing needs. These trace components can generally be classified as
sinks, links and sources. Trace data produced by one or more sources flows
through the intermediate links connecting the source to the currently selected
sink. Each CoreSight component device should use these properties to describe
its hardware characteristcs.

* Required properties for all components *except* non-configurable replicators:

	* compatible: These have to be supplemented with "arm,primecell" as
	  drivers are using the AMBA bus interface.  Possible values include:
		- Embedded Trace Buffer (version 1.0):
			"arm,coresight-etb10", "arm,primecell";

		- Trace Port Interface Unit:
			"arm,coresight-tpiu", "arm,primecell";

		- Trace Memory Controller, used for Embedded Trace Buffer(ETB),
		  Embedded Trace FIFO(ETF) and Embedded Trace Router(ETR)
		  configuration.  The configuration mode (ETB, ETF, ETR) is
		  discovered at boot time when the device is probed.
			"arm,coresight-tmc", "arm,primecell";

		- Trace Funnel:
			"arm,coresight-funnel", "arm,primecell";

		- Embedded Trace Macrocell (version 3.x) and
					Program Flow Trace Macrocell:
			"arm,coresight-etm3x", "arm,primecell";

		- Embedded Trace Macrocell (version 4.x):
			"arm,coresight-etm4x", "arm,primecell";

		- Coresight programmable Replicator :
			"arm,coresight-dynamic-replicator", "arm,primecell";

		- System Trace Macrocell:
			"arm,coresight-stm", "arm,primecell"; [1]
		- Coresight Address Translation Unit (CATU)
			"arm,coresight-catu", "arm,primecell";

		- Trigger Generation Unit:
			"arm,primecell";

	* reg: physical base address and length of the register
	  set(s) of the component.

	* clocks: the clocks associated to this component.

	* clock-names: the name of the clocks referenced by the code.
	  Since we are using the AMBA framework, the name of the clock
	  providing the interconnect should be "apb_pclk", and some
	  coresight blocks also have an additional clock "atclk", which
	  clocks the core of that coresight component. The latter clock
	  is optional.

	* port or ports: The representation of the component's port
	  layout using the generic DT graph presentation found in
	  "bindings/graph.txt".

	* coresight-name: unique descriptive name of the component.

* Additional required properties for System Trace Macrocells (STM):
	* reg: along with the physical base address and length of the register
	  set as described above, another entry is required to describe the
	  mapping of the extended stimulus port area.

	* reg-names: the only acceptable values are "stm-base" and
	  "stm-stimulus-base", each corresponding to the areas defined in "reg".

* Required properties for devices that don't show up on the AMBA bus, such as
  non-configurable replicators:

	* compatible: Currently supported value is (note the absence of the
	  AMBA markee):
		- "arm,coresight-replicator"
		- "arm,coresight-cti"
		- "qcom,coresight-tpda"
		- "qcom,coresight-tpdm"
		- "qcom,coresight-csr"
		- "qcom,coresight-hwevent"
		- "qcom,coresight-dummy"
		- "qcom,coresight-remote-etm"

	* port or ports: same as above.

	* coresight-name: unique descriptive name of the component.

* Additional required property for coresight-tgu devices:
	* tgu-steps: must be present. Indicates number of steps supported
	  by the TGU.
	* tgu-conditions: must be present. Indicates the number of conditions
	  supported by the TGU.
	* tgu-regs: must be present. Indicates the number of regs supported
	  by the TGU.
	* tgu-timer-counters: must be present. Indicates the number of timers and
	  counters available in the TGU to do a comparision.

* Optional properties for all components:
	* reg-names: names corresponding to each reg property value.

	* qcom,proxy-regs: List of regulators required.

	* qcom,proxy-clks: List of additional clocks required.

* Optional properties for ETM/PTMs:

	* arm,cp14: must be present if the system accesses ETM/PTM management
	  registers via co-processor 14.

	* cpu: the cpu phandle this ETM/PTM is affined to. When omitted the
	  source is considered to belong to CPU0.

	* qcom,tupwr-disable: For ETM, don't keep trace unit powered across power
	  collapse.

* Optional property for TMC:

	* arm,buffer-size: size of contiguous buffer space for TMC ETR
	  (embedded trace router). This property is obsolete. The buffer size
	  can be configured dynamically via buffer_size property in sysfs.

	* arm,scatter-gather: boolean. Indicates that the TMC-ETR can safely
	  use the SG mode on this system.

	* arm,default-sink: represents the default compile time CoreSight sink

	* coresight-ctis: represents flush and reset CTIs for TMC buffer

	* qcom,force-reg-dump: enables TMC reg dump support

	* qcom,sw-usb: enables SW mode USB support for TMC ETR

	* arm,sg-enable : indicates whether scatter gather feature is enabled
	  by default for TMC ETR configuration.

* Optional property for CATU :
	* interrupts : Exactly one SPI may be listed for reporting the address
	  error

* Required property for TPDAs:

	* qcom,tpda-atid: must be present. Specifies the ATID for TPDA.

* Optional properties for TPDAs:

	* qcom,bc-elem-size: specifies the BC element size supported by each
	  monitor connected to the aggregator on each port. Should be specified
	  in pairs (port, bc element size).

	* qcom,tc-elem-size: specifies the TC element size supported by each
	  monitor connected to the aggregator on each port. Should be specified
	  in pairs (port, tc element size).

	* qcom,dsb-elem-size: specifies the DSB element size supported by each
	  monitor connected to the aggregator on each port. Should be specified
	  in pairs (port, dsb element size).

	* qcom,cmb-elem-size: specifies the CMB element size supported by each
	  monitor connected to the aggregator on each port. Should be specified
	  in pairs (port, cmb element size).

* Optional properties for TPDM:

	* qcom,clk-enable: specifies whether additional clock bit needs to be
	  set for M4M TPDM.

	* qcom,msr-fix-req: boolean, indicating if MSRs need to be programmed
	  after enabling the subunit.

	* qcom,hw-enable-check: Check if the tpdm need to be probed as some tpdms
	  are not enabled in secure device.

* Optional properties for CSRs:

	* qcom,usb-bam-support: boolean, indicates CSR has the ability to operate on
	  usb bam, include enable,disable and flush.

	* qcom,hwctrl-set-support: boolean, indicates CSR has the ability to operate on
	  to "HWCTRL" register.

	* qcom,set-byte-cntr-support:boolean, indicates CSR has the ability to operate on
	  to "BYTECNT" register.

	* qcom,timestamp-support:boolean, indicates CSR support sys interface to read
	  timestamp value.
	* qcom,aodbg-csr-support: boolean, indicates this CSR is AODBG CSR.

* Required property for Remote ETMs:

	* qcom,inst-id: must be present. QMI instance id for remote ETMs.

* Optional properties for funnels:

	* source: specifies the source that binds to this output port. Only
	  trace from that source routes to this output port.

	* qcom,duplicate-funnel: boolean, indicates its a duplicate of an
	  existing funnel. Funnel devices are now capable of supporting
	  multiple-input and multiple-output configuration with in built
	  hardware filtering for TPDM devices. Each set of input-output
	  combination is treated as independent funnel device.
	  funnel-base-dummy and funnel-base-real reg-names must be specified
	  when this property is enabled.

	* reg-names: funnel-base-dummy: dummy register space used by a
	  duplicate funnel. Should be a valid register address space that
	  no other device is using.

	* reg-names: funnel-base-real: actual register space for the
	  duplicate funnel.

Example:

1. Sinks
	etb@20010000 {
		compatible = "arm,coresight-etb10", "arm,primecell";
		reg = <0 0x20010000 0 0x1000>;

		clocks = <&oscclk6a>;
		clock-names = "apb_pclk";
		port {
			etb_in_port: endpoint@0 {
				slave-mode;
				remote-endpoint = <&replicator_out_port0>;
			};
		};
	};

	tpiu@20030000 {
		compatible = "arm,coresight-tpiu", "arm,primecell";
		reg = <0 0x20030000 0 0x1000>;

		clocks = <&oscclk6a>;
		clock-names = "apb_pclk";
		port {
			tpiu_in_port: endpoint@0 {
				slave-mode;
				remote-endpoint = <&replicator_out_port1>;
			};
		};
	};

	etr@20070000 {
		compatible = "arm,coresight-tmc", "arm,primecell";
		reg = <0 0x20070000 0 0x1000>;

		clocks = <&oscclk6a>;
		clock-names = "apb_pclk";
		ports {
			#address-cells = <1>;
			#size-cells = <0>;

			/* input port */
			port@0 {
				reg =  <0>;
				etr_in_port: endpoint {
					slave-mode;
					remote-endpoint = <&replicator2_out_port0>;
				};
			};

			/* CATU link represented by output port */
			port@1 {
				reg = <1>;
				etr_out_port: endpoint {
					remote-endpoint = <&catu_in_port>;
				};
			};
		};
	};

2. Links
	replicator {
		/* non-configurable replicators don't show up on the
		 * AMBA bus.  As such no need to add "arm,primecell".
		 */
		compatible = "arm,coresight-replicator";

		ports {
			#address-cells = <1>;
			#size-cells = <0>;

			/* replicator output ports */
			port@0 {
				reg = <0>;
				replicator_out_port0: endpoint {
					remote-endpoint = <&etb_in_port>;
				};
			};

			port@1 {
				reg = <1>;
				replicator_out_port1: endpoint {
					remote-endpoint = <&tpiu_in_port>;
				};
			};

			/* replicator input port */
			port@2 {
				reg = <0>;
				replicator_in_port0: endpoint {
					slave-mode;
					remote-endpoint = <&funnel_out_port0>;
				};
			};
		};
	};

	funnel@20040000 {
		compatible = "arm,coresight-funnel", "arm,primecell";
		reg = <0 0x20040000 0 0x1000>;

		clocks = <&oscclk6a>;
		clock-names = "apb_pclk";
		ports {
			#address-cells = <1>;
			#size-cells = <0>;

			/* funnel output port */
			port@0 {
				reg = <0>;
				funnel_out_port0: endpoint {
					remote-endpoint =
							<&replicator_in_port0>;
				};
			};

			/* funnel input ports */
			port@1 {
				reg = <0>;
				funnel_in_port0: endpoint {
					slave-mode;
					remote-endpoint = <&ptm0_out_port>;
				};
			};

			port@2 {
				reg = <1>;
				funnel_in_port1: endpoint {
					slave-mode;
					remote-endpoint = <&ptm1_out_port>;
				};
			};

			port@3 {
				reg = <2>;
				funnel_in_port2: endpoint {
					slave-mode;
					remote-endpoint = <&etm0_out_port>;
				};
			};

		};
	};

	tpda_mss: tpda@7043000 {
		compatible = "qcom,coresight-tpda", "arm,primecell";
		reg = <0x7043000 0x1000>;
		reg-names = "tpda-base";

		coresight-name = "coresight-tpda-mss";

		qcom,tpda-atid = <67>;
		qcom,dsb-elem-size = <0 32>;
		qcom,cmb-elem-size = <0 32>;

		clocks = <&clock_aop qdss_clk>;
		clock-names = "apb_pclk";

		ports {
			#address-cells = <1>;
			#size-cells = <0>;
			port@0 {
				reg = <0>;
				tpda_mss_out_funnel_in1: endpoint {
				remote-endpoint =
					<&funnel_in1_in_tpda_mss>;
				};
			};
			port@1 {
				reg = <0>;
				tpda_mss_in_tpdm_mss: endpoint {
				slave-mode;
				remote-endpoint =
					<&tpdm_mss_out_tpda_mss>;
				};
			};
		};
	};
3. Sources
	ptm@2201c000 {
		compatible = "arm,coresight-etm3x", "arm,primecell";
		reg = <0 0x2201c000 0 0x1000>;

		cpu = <&cpu0>;
		clocks = <&oscclk6a>;
		clock-names = "apb_pclk";
		port {
			ptm0_out_port: endpoint {
				remote-endpoint = <&funnel_in_port0>;
			};
		};
	};

	ptm@2201d000 {
		compatible = "arm,coresight-etm3x", "arm,primecell";
		reg = <0 0x2201d000 0 0x1000>;

		cpu = <&cpu1>;
		clocks = <&oscclk6a>;
		clock-names = "apb_pclk";
		port {
			ptm1_out_port: endpoint {
				remote-endpoint = <&funnel_in_port1>;
			};
		};
	};

4. STM
	stm@20100000 {
		compatible = "arm,coresight-stm", "arm,primecell";
		reg = <0 0x20100000 0 0x1000>,
		      <0 0x28000000 0 0x180000>;
		reg-names = "stm-base", "stm-stimulus-base";

		clocks = <&soc_smc50mhz>;
		clock-names = "apb_pclk";
		port {
			stm_out_port: endpoint {
				remote-endpoint = <&main_funnel_in_port2>;
			};
		};
	};

5. CATU

	catu@207e0000 {
		compatible = "arm,coresight-catu", "arm,primecell";
		reg = <0 0x207e0000 0 0x1000>;

		clocks = <&oscclk6a>;
		clock-names = "apb_pclk";

		interrupts = <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>;
		port {
			catu_in_port: endpoint {
				slave-mode;
				remote-endpoint = <&etr_out_port>;
			};
		};
	};

	tpdm_mss: tpdm@7042000 {
		compatible = "qcom,coresight-tpdm", "arm,primecell";
		reg = <0x7042000 0x1000>;
		reg-names = "tpdm-base";

		coresight-name = "coresight-tpdm-mss";

		clocks = <&clock_aop qdss_clk>;
		clock-names = "apb_pclk";

		port{
			tpdm_mss_out_tpda_mss: endpoint {
				remote-endpoint = <&tpda_mss_in_tpdm_mss>;
		};
	};
};

5. TGUs
	ipcb_tgu: tgu@6b0c000 {
		compatible = "arm,primecell";
		arm,primecell-periphid = <0x0003b999>;
		reg = <0x06B0C000 0x1000>;
		reg-names = "tgu-base";
		tgu-steps = <3>;
		tgu-conditions = <4>;
		tgu-regs = <4>;
		tgu-timer-counters = <8>;

		coresight-name = "coresight-tgu-ipcb";

		clocks = <&clock_aop QDSS_CLK>;
		clock-names = "apb_pclk";
	};
[1]. There is currently two version of STM: STM32 and STM500.  Both
have the same HW interface and as such don't need an explicit binding name.