Documentation/devicetree/bindings/arm/arm,coresight-cti.yaml - linux - Git at Google

 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
 # Copyright 2019 Linaro Ltd.
 %YAML 1.2
 ---
 $id: http://devicetree.org/schemas/arm/arm,coresight-cti.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#

 title: ARM Coresight Cross Trigger Interface (CTI) device.

 description: |
   The CoreSight Embedded Cross Trigger (ECT) consists of CTI devices connected
   to one or more CoreSight components and/or a CPU, with CTIs interconnected in
   a star topology via the Cross Trigger Matrix (CTM), which is not programmable.
   The ECT components are not part of the trace generation data path and are thus
   not part of the CoreSight graph.

   The CTI component properties define the connections between the individual
   CTI and the components it is directly connected to, consisting of input and
   output hardware trigger signals. CTIs can have a maximum number of input and
   output hardware trigger signals (8 each for v1 CTI, 32 each for v2 CTI). The
   number is defined at design time, the maximum of each defined in the DEVID
   register.

   CTIs are interconnected in a star topology via the CTM, using a number of
   programmable channels, usually 4, but again implementation defined and
   described in the DEVID register. The star topology is not required to be
   described in the bindings as the actual connections are software
   programmable.

   In general the connections between CTI and components via the trigger signals
   are implementation defined, except when the CTI is connected to an ARM v8
   architecture core and optional ETM.

   In this case the ARM v8 architecture defines the required signal connections
   between CTI and the CPU core and ETM if present. In the case of a v8
   architecturally connected CTI an additional compatible string is used to
   indicate this feature (arm,coresight-cti-v8-arch).

   When CTI trigger connection information is unavailable then a minimal driver
   binding can be declared with no explicit trigger signals. This will result
   the driver detecting the maximum available triggers and channels from the
   DEVID register and make them all available for use as a single default
   connection. Any user / client application will require additional information
   on the connections between the CTI and other components for correct operation.
   This information might be found by enabling the Integration Test registers in
   the driver (set CONFIG_CORESIGHT_CTI_INTEGRATION_TEST in Kernel
   configuration). These registers may be used to explore the trigger connections
   between CTI and other CoreSight components.

   Certain triggers between CoreSight devices and the CTI have specific types
   and usages. These can be defined along with the signal indexes with the
   constants defined in <dt-bindings/arm/coresight-cti-dt.h>

   For example a CTI connected to a core will usually have a DBGREQ signal. This
   is defined in the binding as type PE_EDBGREQ. These types will appear in an
   optional array alongside the signal indexes. Omitting types will default all
   signals to GEN_IO.

   Note that some hardware trigger signals can be connected to non-CoreSight
   components (e.g. UART etc) depending on hardware implementation.

 maintainers:
   - Mike Leach <mike.leach@linaro.org>

 allOf:
   - $ref: /schemas/arm/primecell.yaml#

 # Need a custom select here or 'arm,primecell' will match on lots of nodes
 select:
   properties:
     compatible:
       contains:
         enum:
           - arm,coresight-cti
   required:
     - compatible

 properties:
   $nodename:
     pattern: "^cti(@[0-9a-f]+)$"
   compatible:
     oneOf:
       - items:
           - const: arm,coresight-cti
           - const: arm,primecell
       - items:
           - const: arm,coresight-cti-v8-arch
           - const: arm,coresight-cti
           - const: arm,primecell

   reg:
     maxItems: 1

   cpu:
     $ref: /schemas/types.yaml#/definitions/phandle
     description:
       Handle to cpu this device is associated with. This must appear in the
       base cti node if compatible string arm,coresight-cti-v8-arch is used,
       or may appear in a trig-conns child node when appropriate.

   power-domains:
     maxItems: 1

   arm,cti-ctm-id:
     $ref: /schemas/types.yaml#/definitions/uint32
     description:
       Defines the CTM this CTI is connected to, in large systems with multiple
       separate CTI/CTM nets. Typically multi-socket systems where the CTM is
       propagated between sockets.

   arm,cs-dev-assoc:
     $ref: /schemas/types.yaml#/definitions/phandle
     description:
       defines a phandle reference to an associated CoreSight trace device.
       When the associated trace device is enabled, then the respective CTI
       will be enabled. Use in a trig-conns node, or in CTI base node when
       compatible string arm,coresight-cti-v8-arch used. If the associated
       device has not been registered then the node name will be stored as
       the connection name for later resolution. If the associated device is
       not a CoreSight device or not registered then the node name will remain
       the connection name and automatic enabling will not occur.

   # size cells and address cells required if trig-conns node present.
   "#size-cells":
     const: 0

   "#address-cells":
     const: 1

 patternProperties:
   '^trig-conns@([0-9]+)$':
     type: object
     description:
       A trigger connections child node which describes the trigger signals
       between this CTI and another hardware device. This device may be a CPU,
       CoreSight device, any other hardware device or simple external IO lines.
       The connection may have both input and output triggers, or only one or the
       other.

     properties:
       reg:
         maxItems: 1

       arm,trig-in-sigs:
         $ref: /schemas/types.yaml#/definitions/uint32-array
         minItems: 1
         maxItems: 32
         description:
           List of CTI trigger in signal numbers in use by a trig-conns node.

       arm,trig-in-types:
         $ref: /schemas/types.yaml#/definitions/uint32-array
         minItems: 1
         maxItems: 32
         description:
           List of constants representing the types for the CTI trigger in
           signals. Types in this array match to the corresponding signal in the
           arm,trig-in-sigs array. If the -types array is smaller, or omitted
           completely, then the types will default to GEN_IO.

       arm,trig-out-sigs:
         $ref: /schemas/types.yaml#/definitions/uint32-array
         minItems: 1
         maxItems: 32
         description:
           List of CTI trigger out signal numbers in use by a trig-conns node.

       arm,trig-out-types:
         $ref: /schemas/types.yaml#/definitions/uint32-array
         minItems: 1
         maxItems: 32
         description:
           List of constants representing the types for the CTI trigger out
           signals. Types in this array match to the corresponding signal
           in the arm,trig-out-sigs array. If the "-types" array is smaller,
           or omitted completely, then the types will default to GEN_IO.

       arm,trig-filters:
         $ref: /schemas/types.yaml#/definitions/uint32-array
         minItems: 1
         maxItems: 32
         description:
           List of CTI trigger out signals that will be blocked from becoming
           active, unless filtering is disabled on the driver.

       arm,trig-conn-name:
         $ref: /schemas/types.yaml#/definitions/string
         description:
           Defines a connection name that will be displayed, if the cpu or
           arm,cs-dev-assoc properties are not being used in this connection.
           Principle use for CTI that are connected to non-CoreSight devices, or
           external IO.

     anyOf:
       - required:
           - arm,trig-in-sigs
       - required:
           - arm,trig-out-sigs
     oneOf:
       - required:
           - arm,trig-conn-name
       - required:
           - cpu
       - required:
           - arm,cs-dev-assoc
     required:
       - reg

 required:
   - compatible
   - reg
   - clocks
   - clock-names

 if:
   properties:
     compatible:
       contains:
         const: arm,coresight-cti-v8-arch

 then:
   required:
     - cpu

 unevaluatedProperties: false

 examples:
   # minimum CTI definition. DEVID register used to set number of triggers.
   - |
     cti@20020000 {
       compatible = "arm,coresight-cti", "arm,primecell";
       reg = <0x20020000 0x1000>;

       clocks = <&soc_smc50mhz>;
       clock-names = "apb_pclk";
     };
   #  v8 architecturally defined CTI - CPU + ETM connections generated by the
   #  driver according to the v8 architecture specification.
   - |
     cti@859000 {
       compatible = "arm,coresight-cti-v8-arch", "arm,coresight-cti",
                    "arm,primecell";
       reg = <0x859000 0x1000>;

       clocks = <&soc_smc50mhz>;
       clock-names = "apb_pclk";

       cpu = <&CPU1>;
       arm,cs-dev-assoc = <&etm1>;
     };
   # Implementation defined CTI - CPU + ETM connections explicitly defined..
   # Shows use of type constants from dt-bindings/arm/coresight-cti-dt.h
   # #size-cells and #address-cells are required if trig-conns@ nodes present.
   - |
     #include <dt-bindings/arm/coresight-cti-dt.h>

     cti@858000 {
       compatible = "arm,coresight-cti", "arm,primecell";
       reg = <0x858000 0x1000>;

       clocks = <&soc_smc50mhz>;
       clock-names = "apb_pclk";

       arm,cti-ctm-id = <1>;

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

       trig-conns@0 {
             reg = <0>;
             arm,trig-in-sigs = <4 5 6 7>;
             arm,trig-in-types = <ETM_EXTOUT
                                  ETM_EXTOUT
                                  ETM_EXTOUT
                                  ETM_EXTOUT>;
             arm,trig-out-sigs = <4 5 6 7>;
             arm,trig-out-types = <ETM_EXTIN
                                   ETM_EXTIN
                                   ETM_EXTIN
                                   ETM_EXTIN>;
             arm,cs-dev-assoc = <&etm0>;
       };

       trig-conns@1 {
             reg = <1>;
             cpu = <&CPU0>;
             arm,trig-in-sigs = <0 1>;
             arm,trig-in-types = <PE_DBGTRIGGER
                                  PE_PMUIRQ>;
             arm,trig-out-sigs = <0 1 2 >;
             arm,trig-out-types = <PE_EDBGREQ
                                   PE_DBGRESTART
                                   PE_CTIIRQ>;

             arm,trig-filters = <0>;
       };
     };
   # Implementation defined CTI - non CoreSight component connections.
   - |
     cti@20110000 {
       compatible = "arm,coresight-cti", "arm,primecell";
       reg = <0x20110000 0x1000>;

       clocks = <&soc_smc50mhz>;
       clock-names = "apb_pclk";

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

       trig-conns@0 {
         reg = <0>;
         arm,trig-in-sigs = <0>;
         arm,trig-in-types = <GEN_INTREQ>;
         arm,trig-out-sigs = <0>;
         arm,trig-out-types = <GEN_HALTREQ>;
         arm,trig-conn-name = "sys_profiler";
       };

       trig-conns@1 {
         reg = <1>;
         arm,trig-out-sigs = <2 3>;
         arm,trig-out-types = <GEN_HALTREQ GEN_RESTARTREQ>;
         arm,trig-conn-name = "watchdog";
       };

       trig-conns@2 {
         reg = <2>;
         arm,trig-in-sigs = <1 6>;
         arm,trig-in-types = <GEN_HALTREQ GEN_RESTARTREQ>;
         arm,trig-conn-name = "g_counter";
       };
     };

 ...
	# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
	# Copyright 2019 Linaro Ltd.
	%YAML 1.2
	---
	$id: http://devicetree.org/schemas/arm/arm,coresight-cti.yaml#
	$schema: http://devicetree.org/meta-schemas/core.yaml#

	title: ARM Coresight Cross Trigger Interface (CTI) device.

	description: \|
	The CoreSight Embedded Cross Trigger (ECT) consists of CTI devices connected
	to one or more CoreSight components and/or a CPU, with CTIs interconnected in
	a star topology via the Cross Trigger Matrix (CTM), which is not programmable.
	The ECT components are not part of the trace generation data path and are thus
	not part of the CoreSight graph.

	The CTI component properties define the connections between the individual
	CTI and the components it is directly connected to, consisting of input and
	output hardware trigger signals. CTIs can have a maximum number of input and
	output hardware trigger signals (8 each for v1 CTI, 32 each for v2 CTI). The
	number is defined at design time, the maximum of each defined in the DEVID
	register.

	CTIs are interconnected in a star topology via the CTM, using a number of
	programmable channels, usually 4, but again implementation defined and
	described in the DEVID register. The star topology is not required to be
	described in the bindings as the actual connections are software
	programmable.

	In general the connections between CTI and components via the trigger signals
	are implementation defined, except when the CTI is connected to an ARM v8
	architecture core and optional ETM.

	In this case the ARM v8 architecture defines the required signal connections
	between CTI and the CPU core and ETM if present. In the case of a v8
	architecturally connected CTI an additional compatible string is used to
	indicate this feature (arm,coresight-cti-v8-arch).

	When CTI trigger connection information is unavailable then a minimal driver
	binding can be declared with no explicit trigger signals. This will result
	the driver detecting the maximum available triggers and channels from the
	DEVID register and make them all available for use as a single default
	connection. Any user / client application will require additional information
	on the connections between the CTI and other components for correct operation.
	This information might be found by enabling the Integration Test registers in
	the driver (set CONFIG_CORESIGHT_CTI_INTEGRATION_TEST in Kernel
	configuration). These registers may be used to explore the trigger connections
	between CTI and other CoreSight components.

	Certain triggers between CoreSight devices and the CTI have specific types
	and usages. These can be defined along with the signal indexes with the
	constants defined in <dt-bindings/arm/coresight-cti-dt.h>

	For example a CTI connected to a core will usually have a DBGREQ signal. This
	is defined in the binding as type PE_EDBGREQ. These types will appear in an
	optional array alongside the signal indexes. Omitting types will default all
	signals to GEN_IO.

	Note that some hardware trigger signals can be connected to non-CoreSight
	components (e.g. UART etc) depending on hardware implementation.

	maintainers:
	- Mike Leach <mike.leach@linaro.org>

	allOf:
	- $ref: /schemas/arm/primecell.yaml#

	# Need a custom select here or 'arm,primecell' will match on lots of nodes
	select:
	properties:
	compatible:
	contains:
	enum:
	- arm,coresight-cti
	required:
	- compatible

	properties:
	$nodename:
	pattern: "^cti(@[0-9a-f]+)$"
	compatible:
	oneOf:
	- items:
	- const: arm,coresight-cti
	- const: arm,primecell
	- items:
	- const: arm,coresight-cti-v8-arch
	- const: arm,coresight-cti
	- const: arm,primecell

	reg:
	maxItems: 1

	cpu:
	$ref: /schemas/types.yaml#/definitions/phandle
	description:
	Handle to cpu this device is associated with. This must appear in the
	base cti node if compatible string arm,coresight-cti-v8-arch is used,
	or may appear in a trig-conns child node when appropriate.

	power-domains:
	maxItems: 1

	arm,cti-ctm-id:
	$ref: /schemas/types.yaml#/definitions/uint32
	description:
	Defines the CTM this CTI is connected to, in large systems with multiple
	separate CTI/CTM nets. Typically multi-socket systems where the CTM is
	propagated between sockets.

	arm,cs-dev-assoc:
	$ref: /schemas/types.yaml#/definitions/phandle
	description:
	defines a phandle reference to an associated CoreSight trace device.
	When the associated trace device is enabled, then the respective CTI
	will be enabled. Use in a trig-conns node, or in CTI base node when
	compatible string arm,coresight-cti-v8-arch used. If the associated
	device has not been registered then the node name will be stored as
	the connection name for later resolution. If the associated device is
	not a CoreSight device or not registered then the node name will remain
	the connection name and automatic enabling will not occur.

	# size cells and address cells required if trig-conns node present.
	"#size-cells":
	const: 0

	"#address-cells":
	const: 1

	patternProperties:
	'^trig-conns@([0-9]+)$':
	type: object
	description:
	A trigger connections child node which describes the trigger signals
	between this CTI and another hardware device. This device may be a CPU,
	CoreSight device, any other hardware device or simple external IO lines.
	The connection may have both input and output triggers, or only one or the
	other.

	properties:
	reg:
	maxItems: 1

	arm,trig-in-sigs:
	$ref: /schemas/types.yaml#/definitions/uint32-array
	minItems: 1
	maxItems: 32
	description:
	List of CTI trigger in signal numbers in use by a trig-conns node.

	arm,trig-in-types:
	$ref: /schemas/types.yaml#/definitions/uint32-array
	minItems: 1
	maxItems: 32
	description:
	List of constants representing the types for the CTI trigger in
	signals. Types in this array match to the corresponding signal in the
	arm,trig-in-sigs array. If the -types array is smaller, or omitted
	completely, then the types will default to GEN_IO.

	arm,trig-out-sigs:
	$ref: /schemas/types.yaml#/definitions/uint32-array
	minItems: 1
	maxItems: 32
	description:
	List of CTI trigger out signal numbers in use by a trig-conns node.

	arm,trig-out-types:
	$ref: /schemas/types.yaml#/definitions/uint32-array
	minItems: 1
	maxItems: 32
	description:
	List of constants representing the types for the CTI trigger out
	signals. Types in this array match to the corresponding signal
	in the arm,trig-out-sigs array. If the "-types" array is smaller,
	or omitted completely, then the types will default to GEN_IO.

	arm,trig-filters:
	$ref: /schemas/types.yaml#/definitions/uint32-array
	minItems: 1
	maxItems: 32
	description:
	List of CTI trigger out signals that will be blocked from becoming
	active, unless filtering is disabled on the driver.

	arm,trig-conn-name:
	$ref: /schemas/types.yaml#/definitions/string
	description:
	Defines a connection name that will be displayed, if the cpu or
	arm,cs-dev-assoc properties are not being used in this connection.
	Principle use for CTI that are connected to non-CoreSight devices, or
	external IO.

	anyOf:
	- required:
	- arm,trig-in-sigs
	- required:
	- arm,trig-out-sigs
	oneOf:
	- required:
	- arm,trig-conn-name
	- required:
	- cpu
	- required:
	- arm,cs-dev-assoc
	required:
	- reg

	required:
	- compatible
	- reg
	- clocks
	- clock-names

	if:
	properties:
	compatible:
	contains:
	const: arm,coresight-cti-v8-arch

	then:
	required:
	- cpu

	unevaluatedProperties: false

	examples:
	# minimum CTI definition. DEVID register used to set number of triggers.
	- \|
	cti@20020000 {
	compatible = "arm,coresight-cti", "arm,primecell";
	reg = <0x20020000 0x1000>;

	clocks = <&soc_smc50mhz>;
	clock-names = "apb_pclk";
	};
	# v8 architecturally defined CTI - CPU + ETM connections generated by the
	# driver according to the v8 architecture specification.
	- \|
	cti@859000 {
	compatible = "arm,coresight-cti-v8-arch", "arm,coresight-cti",
	"arm,primecell";
	reg = <0x859000 0x1000>;

	clocks = <&soc_smc50mhz>;
	clock-names = "apb_pclk";

	cpu = <&CPU1>;
	arm,cs-dev-assoc = <&etm1>;
	};
	# Implementation defined CTI - CPU + ETM connections explicitly defined..
	# Shows use of type constants from dt-bindings/arm/coresight-cti-dt.h
	# #size-cells and #address-cells are required if trig-conns@ nodes present.
	- \|
	#include <dt-bindings/arm/coresight-cti-dt.h>

	cti@858000 {
	compatible = "arm,coresight-cti", "arm,primecell";
	reg = <0x858000 0x1000>;

	clocks = <&soc_smc50mhz>;
	clock-names = "apb_pclk";

	arm,cti-ctm-id = <1>;

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

	trig-conns@0 {
	reg = <0>;
	arm,trig-in-sigs = <4 5 6 7>;
	arm,trig-in-types = <ETM_EXTOUT
	ETM_EXTOUT
	ETM_EXTOUT
	ETM_EXTOUT>;
	arm,trig-out-sigs = <4 5 6 7>;
	arm,trig-out-types = <ETM_EXTIN
	ETM_EXTIN
	ETM_EXTIN
	ETM_EXTIN>;
	arm,cs-dev-assoc = <&etm0>;
	};

	trig-conns@1 {
	reg = <1>;
	cpu = <&CPU0>;
	arm,trig-in-sigs = <0 1>;
	arm,trig-in-types = <PE_DBGTRIGGER
	PE_PMUIRQ>;
	arm,trig-out-sigs = <0 1 2 >;
	arm,trig-out-types = <PE_EDBGREQ
	PE_DBGRESTART
	PE_CTIIRQ>;

	arm,trig-filters = <0>;
	};
	};
	# Implementation defined CTI - non CoreSight component connections.
	- \|
	cti@20110000 {
	compatible = "arm,coresight-cti", "arm,primecell";
	reg = <0x20110000 0x1000>;

	clocks = <&soc_smc50mhz>;
	clock-names = "apb_pclk";

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

	trig-conns@0 {
	reg = <0>;
	arm,trig-in-sigs = <0>;
	arm,trig-in-types = <GEN_INTREQ>;
	arm,trig-out-sigs = <0>;
	arm,trig-out-types = <GEN_HALTREQ>;
	arm,trig-conn-name = "sys_profiler";
	};

	trig-conns@1 {
	reg = <1>;
	arm,trig-out-sigs = <2 3>;
	arm,trig-out-types = <GEN_HALTREQ GEN_RESTARTREQ>;
	arm,trig-conn-name = "watchdog";
	};

	trig-conns@2 {
	reg = <2>;
	arm,trig-in-sigs = <1 6>;
	arm,trig-in-types = <GEN_HALTREQ GEN_RESTARTREQ>;
	arm,trig-conn-name = "g_counter";
	};
	};

	...