1 # SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
2 # Copyright 2019 Linaro Ltd.
5 $id: http://devicetree.org/schemas/arm/coresight-cti.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
8 title: ARM Coresight Cross Trigger Interface (CTI) device.
11 The CoreSight Embedded Cross Trigger (ECT) consists of CTI devices connected
12 to one or more CoreSight components and/or a CPU, with CTIs interconnected in
13 a star topology via the Cross Trigger Matrix (CTM), which is not programmable.
14 The ECT components are not part of the trace generation data path and are thus
15 not part of the CoreSight graph described in the general CoreSight bindings
18 The CTI component properties define the connections between the individual
19 CTI and the components it is directly connected to, consisting of input and
20 output hardware trigger signals. CTIs can have a maximum number of input and
21 output hardware trigger signals (8 each for v1 CTI, 32 each for v2 CTI). The
22 number is defined at design time, the maximum of each defined in the DEVID
25 CTIs are interconnected in a star topology via the CTM, using a number of
26 programmable channels, usually 4, but again implementation defined and
27 described in the DEVID register. The star topology is not required to be
28 described in the bindings as the actual connections are software
31 In general the connections between CTI and components via the trigger signals
32 are implementation defined, except when the CTI is connected to an ARM v8
33 architecture core and optional ETM.
35 In this case the ARM v8 architecture defines the required signal connections
36 between CTI and the CPU core and ETM if present. In the case of a v8
37 architecturally connected CTI an additional compatible string is used to
38 indicate this feature (arm,coresight-cti-v8-arch).
40 When CTI trigger connection information is unavailable then a minimal driver
41 binding can be declared with no explicit trigger signals. This will result
42 the driver detecting the maximum available triggers and channels from the
43 DEVID register and make them all available for use as a single default
44 connection. Any user / client application will require additional information
45 on the connections between the CTI and other components for correct operation.
46 This information might be found by enabling the Integration Test registers in
47 the driver (set CONFIG_CORESIGHT_CTI_INTEGRATION_TEST in Kernel
48 configuration). These registers may be used to explore the trigger connections
49 between CTI and other CoreSight components.
51 Certain triggers between CoreSight devices and the CTI have specific types
52 and usages. These can be defined along with the signal indexes with the
53 constants defined in <dt-bindings/arm/coresight-cti-dt.h>
55 For example a CTI connected to a core will usually have a DBGREQ signal. This
56 is defined in the binding as type PE_EDBGREQ. These types will appear in an
57 optional array alongside the signal indexes. Omitting types will default all
60 Note that some hardware trigger signals can be connected to non-CoreSight
61 components (e.g. UART etc) depending on hardware implementation.
64 - Mike Leach <mike.leach@linaro.org>
67 - $ref: /schemas/arm/primecell.yaml#
69 # Need a custom select here or 'arm,primecell' will match on lots of nodes
81 pattern: "^cti(@[0-9a-f]+)$"
85 - const: arm,coresight-cti
86 - const: arm,primecell
88 - const: arm,coresight-cti-v8-arch
89 - const: arm,coresight-cti
90 - const: arm,primecell
96 $ref: /schemas/types.yaml#/definitions/phandle
98 Handle to cpu this device is associated with. This must appear in the
99 base cti node if compatible string arm,coresight-cti-v8-arch is used,
100 or may appear in a trig-conns child node when appropriate.
103 $ref: /schemas/types.yaml#/definitions/uint32
105 Defines the CTM this CTI is connected to, in large systems with multiple
106 separate CTI/CTM nets. Typically multi-socket systems where the CTM is
107 propagated between sockets.
110 $ref: /schemas/types.yaml#/definitions/phandle
112 defines a phandle reference to an associated CoreSight trace device.
113 When the associated trace device is enabled, then the respective CTI
114 will be enabled. Use in a trig-conns node, or in CTI base node when
115 compatible string arm,coresight-cti-v8-arch used. If the associated
116 device has not been registered then the node name will be stored as
117 the connection name for later resolution. If the associated device is
118 not a CoreSight device or not registered then the node name will remain
119 the connection name and automatic enabling will not occur.
121 # size cells and address cells required if trig-conns node present.
129 '^trig-conns@([0-9]+)$':
132 A trigger connections child node which describes the trigger signals
133 between this CTI and another hardware device. This device may be a CPU,
134 CoreSight device, any other hardware device or simple external IO lines.
135 The connection may have both input and output triggers, or only one or the
143 $ref: /schemas/types.yaml#/definitions/uint32-array
147 List of CTI trigger in signal numbers in use by a trig-conns node.
150 $ref: /schemas/types.yaml#/definitions/uint32-array
154 List of constants representing the types for the CTI trigger in
155 signals. Types in this array match to the corresponding signal in the
156 arm,trig-in-sigs array. If the -types array is smaller, or omitted
157 completely, then the types will default to GEN_IO.
160 $ref: /schemas/types.yaml#/definitions/uint32-array
164 List of CTI trigger out signal numbers in use by a trig-conns node.
167 $ref: /schemas/types.yaml#/definitions/uint32-array
171 List of constants representing the types for the CTI trigger out
172 signals. Types in this array match to the corresponding signal
173 in the arm,trig-out-sigs array. If the "-types" array is smaller,
174 or omitted completely, then the types will default to GEN_IO.
177 $ref: /schemas/types.yaml#/definitions/uint32-array
181 List of CTI trigger out signals that will be blocked from becoming
182 active, unless filtering is disabled on the driver.
185 $ref: /schemas/types.yaml#/definitions/string
187 Defines a connection name that will be displayed, if the cpu or
188 arm,cs-dev-assoc properties are not being used in this connection.
189 Principle use for CTI that are connected to non-CoreSight devices, or
217 const: arm,coresight-cti-v8-arch
223 unevaluatedProperties: false
226 # minimum CTI definition. DEVID register used to set number of triggers.
229 compatible = "arm,coresight-cti", "arm,primecell";
230 reg = <0x20020000 0x1000>;
232 clocks = <&soc_smc50mhz>;
233 clock-names = "apb_pclk";
235 # v8 architecturally defined CTI - CPU + ETM connections generated by the
236 # driver according to the v8 architecture specification.
239 compatible = "arm,coresight-cti-v8-arch", "arm,coresight-cti",
241 reg = <0x859000 0x1000>;
243 clocks = <&soc_smc50mhz>;
244 clock-names = "apb_pclk";
247 arm,cs-dev-assoc = <&etm1>;
249 # Implementation defined CTI - CPU + ETM connections explicitly defined..
250 # Shows use of type constants from dt-bindings/arm/coresight-cti-dt.h
251 # #size-cells and #address-cells are required if trig-conns@ nodes present.
253 #include <dt-bindings/arm/coresight-cti-dt.h>
256 compatible = "arm,coresight-cti", "arm,primecell";
257 reg = <0x858000 0x1000>;
259 clocks = <&soc_smc50mhz>;
260 clock-names = "apb_pclk";
262 arm,cti-ctm-id = <1>;
264 #address-cells = <1>;
269 arm,trig-in-sigs = <4 5 6 7>;
270 arm,trig-in-types = <ETM_EXTOUT
274 arm,trig-out-sigs = <4 5 6 7>;
275 arm,trig-out-types = <ETM_EXTIN
279 arm,cs-dev-assoc = <&etm0>;
285 arm,trig-in-sigs = <0 1>;
286 arm,trig-in-types = <PE_DBGTRIGGER
288 arm,trig-out-sigs=<0 1 2 >;
289 arm,trig-out-types = <PE_EDBGREQ
293 arm,trig-filters = <0>;
296 # Implementation defined CTI - non CoreSight component connections.
299 compatible = "arm,coresight-cti", "arm,primecell";
300 reg = <0x20110000 0x1000>;
302 clocks = <&soc_smc50mhz>;
303 clock-names = "apb_pclk";
305 #address-cells = <1>;
310 arm,trig-in-sigs=<0>;
311 arm,trig-in-types=<GEN_INTREQ>;
312 arm,trig-out-sigs=<0>;
313 arm,trig-out-types=<GEN_HALTREQ>;
314 arm,trig-conn-name = "sys_profiler";
319 arm,trig-out-sigs=<2 3>;
320 arm,trig-out-types=<GEN_HALTREQ GEN_RESTARTREQ>;
321 arm,trig-conn-name = "watchdog";
326 arm,trig-in-sigs=<1 6>;
327 arm,trig-in-types=<GEN_HALTREQ GEN_RESTARTREQ>;
328 arm,trig-conn-name = "g_counter";