Subject: Re: [PATCH v5 05/14] dt-bindings: arm: Adds CoreSight CTI hardware definitions.

From: Mathieu Poirier <[email-masked]>
Date: Wed, 20 Nov 2019 12:06:04 -0700

On Tue, Nov 19, 2019 at 11:19:03PM +0000, Mike Leach wrote:
> Adds new coresight-cti.yaml file describing the bindings required to define
> CTI in the device trees.
> 
> Adds an include file to dt-bindings/arm to define constants describing
> common signal functionality used in CoreSight and generic usage.
> 
> Signed-off-by: Mike Leach <[email-masked]>
> ---
>  .../bindings/arm/coresight-cti.yaml           | 303 ++++++++++++++++++
>  .../devicetree/bindings/arm/coresight.txt     |   7 +
>  MAINTAINERS                                   |   2 +
>  include/dt-bindings/arm/coresight-cti-dt.h    |  37 +++
>  4 files changed, 349 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/coresight-cti.yaml
>  create mode 100644 include/dt-bindings/arm/coresight-cti-dt.h
> 
> diff --git a/Documentation/devicetree/bindings/arm/coresight-cti.yaml b/Documentation/devicetree/bindings/arm/coresight-cti.yaml
> new file mode 100644
> index 000000000000..882c72f1c798
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/coresight-cti.yaml
> @@ -0,0 +1,303 @@
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright 2019 Linaro Ltd.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/arm/coresight-cti.yaml#
> +$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 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 described in the general CoreSight bindings file
> +  coresight.txt.
> +
> +  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, other than when v8 core and ETM is present.
> +  The v8 architecture defines the required signal connections between CPU core
> +  and CTI, and ETM and CTI, if the ETM if present.
> +
> +  When only minimal information is available for the CTI trigger connections,
> +  then a minimal driver binding can be declare with no explicit trigger
> +  signals. This will result in the using the DEVID register to set the
> +  input and output triggers and channels in use. Any user / client
> +  application will require additional information on the connections
> +  between the CTI and other components for correct operation. This minimal
> +  binding may be used when using the Integration Control registers to
> +  discover 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 <[email-masked]>
> +
> +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:
> +    items:
> +      - const: arm,coresight-cti
> +      - const: arm,primecell
> +
> +  reg:
> +    items:
> +      - description: device programming registers
> +
> +  arm,cti-v8-arch:
> +    type: boolean
> +    description:
> +      This CTI follows the v8 architecturally mandated layout for a CTI.
> +      Bindings declaring this must declare a cpu, and optionally a single
> +      arm,cs-dev-assoc may be present to define an attached ETM. No additional
> +      trig-conns nodes are permitted. The driver will build a connection model
> +      according to architectural requirements. This will include a filter on
> +      the CPU dbgreq signal as described above.
> +
> +  cpu:
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/phandle
> +    description: Handle to cpu this device is associated with.
> +
> +  arm,cti-ctm-id:
> +    allOf:
> +      - $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:
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      defines a phandle reference to an associated CoreSight trace device.
> +      When the associated trace device is enabled, then the respective CTI
> +      will be enabled. Use in a trig-conns node, or in CTI base node when
> +      arm,cti-v8-arch present. If the associated device has not been registered
> +      then the node name will be stored as the connection name for later
> +      resolution. If the associated device is not a CoreSight device or not
> +      registered then the node name will remain the connection name and
> +      automatic enabling will not occur.
> +
> +patternProperties:
> +  '^trig_conns@[0-9]+$':
> +    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:
> +
> +      arm,trig-in-sigs:
> +        allOf:
> +          - $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:
> +        allOf:
> +          - $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:
> +        allOf:
> +          - $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:
> +        allOf:
> +          - $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:
> +        allOf:
> +          - $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:
> +        allOf:
> +          - $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:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +
> +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", "arm,primecell";
> +      reg = <0x859000 0x1000>;
> +
> +      clocks = <&soc_smc50mhz>;
> +      clock-names = "apb_pclk";
> +
> +      arm,cti-v8-arch;
> +      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
> +  - |
> +    #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>;
> +
> +      trig-conns@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 {
> +            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 - none CoreSight component connections.
> +  - |
> +    cti@20110000 {
> +      compatible = "arm,coresight-cti", "arm,primecell";
> +      reg = <0 0x20110000 0 0x1000>;
> +
> +      clocks = <&soc_smc50mhz>;
> +      clock-names = "apb_pclk";
> +
> +      trig-conns@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 {
> +        arm,trig-out-sigs=<2 3>;
> +        arm,trig-out-types=<GEN_HALTREQ GEN_RESTARTREQ>;
> +        arm,trig-conn-name = "watchdog";
> +      };
> +
> +      trig-conns@2 {
> +        arm,trig-in-sigs=<1 6>;
> +        arm,trig-in-types=<GEN_HALTREQ GEN_RESTARTREQ>;
> +        arm,trig-conn-name = "g_counter";
> +      };
> +    };
> +
> +...

I'm not sure what the "..." is there for.  It is not present in the example
schema[1] but I can find the patter in other .yaml files.  As such I will let
Rob decide on that part.

Reviewed-by: Mathieu Poirier <[email-masked]>

[1]. Documentation/devicetree/bindings/example-schema.yaml

> \ No newline at end of file
> diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt
> index d02c42d21f2f..846f6daae71b 100644
> --- a/Documentation/devicetree/bindings/arm/coresight.txt
> +++ b/Documentation/devicetree/bindings/arm/coresight.txt
> @@ -45,6 +45,10 @@ its hardware characteristcs.
>  		- Coresight Address Translation Unit (CATU)
>  			"arm,coresight-catu", "arm,primecell";
>  
> +		- Coresight Cross Trigger Interface (CTI):
> +			"arm,coresight-cti", "arm,primecell";
> +			See coresight-cti.yaml for full CTI definitions.
> +
>  	* reg: physical base address and length of the register
>  	  set(s) of the component.
>  
> @@ -72,6 +76,9 @@ its hardware characteristcs.
>  	* reg-names: the only acceptable values are "stm-base" and
>  	  "stm-stimulus-base", each corresponding to the areas defined in "reg".
>  
> +* Required properties for Coresight Cross Trigger Interface (CTI)
> +	See coresight-cti.yaml for full CTI definitions.
> +
>  * Required properties for devices that don't show up on the AMBA bus, such as
>    non-configurable replicators and non-configurable funnels:
>  
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 9de89d75dbcc..8d01a74068f7 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1608,9 +1608,11 @@ R:	Suzuki K Poulose <[email-masked]>
>  L:	[email-masked] (moderated for non-subscribers)
>  S:	Maintained
>  F:	drivers/hwtracing/coresight/*
> +F:	include/dt-bindings/arm/coresight-cti-dt.h
>  F:	Documentation/trace/coresight/*
>  F:	Documentation/devicetree/bindings/arm/coresight.txt
>  F:	Documentation/devicetree/bindings/arm/coresight-cpu-debug.txt
> +F:	Documentation/devicetree/bindings/arm/coresight-cti.yaml
>  F:	Documentation/ABI/testing/sysfs-bus-coresight-devices-*
>  F:	tools/perf/arch/arm/util/pmu.c
>  F:	tools/perf/arch/arm/util/auxtrace.c
> diff --git a/include/dt-bindings/arm/coresight-cti-dt.h b/include/dt-bindings/arm/coresight-cti-dt.h
> new file mode 100644
> index 000000000000..61e7bdf8ea6e
> --- /dev/null
> +++ b/include/dt-bindings/arm/coresight-cti-dt.h
> @@ -0,0 +1,37 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * This header provides constants for the defined trigger signal
> + * types on CoreSight CTI.
> + */
> +
> +#ifndef _DT_BINDINGS_ARM_CORESIGHT_CTI_DT_H
> +#define _DT_BINDINGS_ARM_CORESIGHT_CTI_DT_H
> +
> +#define GEN_IO		0
> +#define GEN_INTREQ	1
> +#define GEN_INTACK	2
> +#define GEN_HALTREQ	3
> +#define GEN_RESTARTREQ	4
> +#define PE_EDBGREQ	5
> +#define PE_DBGRESTART	6
> +#define PE_CTIIRQ	7
> +#define PE_PMUIRQ	8
> +#define PE_DBGTRIGGER	9
> +#define ETM_EXTOUT	10
> +#define ETM_EXTIN	11
> +#define SNK_FULL	12
> +#define SNK_ACQCOMP	13
> +#define SNK_FLUSHCOMP	14
> +#define SNK_FLUSHIN	15
> +#define SNK_TRIGIN	16
> +#define STM_ASYNCOUT	17
> +#define STM_TOUT_SPTE	18
> +#define STM_TOUT_SW	19
> +#define STM_TOUT_HETE	20
> +#define STM_HWEVENT	21
> +#define ELA_TSTART	22
> +#define ELA_TSTOP	23
> +#define ELA_DBGREQ	24
> +#define CTI_TRIG_MAX	25
> +
> +#endif /*_DT_BINDINGS_ARM_CORESIGHT_CTI_DT_H */
> -- 
> 2.17.1
> 

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