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Message-ID: <51b9e189-7fa0-48b1-b5d2-b043fa1d8ed1@kernel.org> Date: Mon, 2 Sep 2024 10:05:01 +0200 From: Krzysztof Kozlowski <krzk@...nel.org> To: songchai <quic_songchai@...cinc.com>, Suzuki K Poulose <suzuki.poulose@....com>, Mike Leach <mike.leach@...aro.org>, James Clark <james.clark@....com>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Andy Gross <agross@...nel.org>, Bjorn Andersson <andersson@...nel.org>, Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org> Cc: linux-kernel@...r.kernel.org, coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org Subject: Re: [PATCH v1 1/7] dt-bindings: arm: Add support for Coresight TGU trace On 02/09/2024 09:24, songchai wrote: > > On 9/2/2024 3:02 PM, Krzysztof Kozlowski wrote: >> On 02/09/2024 05:14, songchai wrote: >>> On 8/30/2024 6:11 PM, Krzysztof Kozlowski wrote: >>>> On 30/08/2024 11:23, songchai wrote: >>>>> The Trigger Generation Unit (TGU) is designed to detect patterns or >>>>> sequences within a specific region of the System on Chip (SoC). Once >>>>> configured and activated, it monitors sense inputs and can detect a >>>>> pre-programmed state or sequence across clock cycles, subsequently >>>>> producing a trigger. >>>>> >>>>> TGU configuration space >>>>> offset table >>>>> x-------------------------x >>>>> | | >>>>> | | >>>>> | | Step configuration >>>>> | | space layout >>>>> | coresight management | x-------------x >>>>> | registers | |---> | | >>>>> | | | | reserve | >>>>> | | | | | >>>>> |-------------------------| | |-------------| >>>>> | | | | prioroty[3] | >>>>> | step[7] |<-- | |-------------| >>>>> |-------------------------| | | | prioroty[2] | >>>>> | | | | |-------------| >>>>> | ... | |Steps region | | prioroty[1] | >>>>> | | | | |-------------| >>>>> |-------------------------| | | | prioroty[0] | >>>>> | |<-- | |-------------| >>>>> | step[0] |--------------------> | | >>>>> |-------------------------| | condition | >>>>> | | | | >>>>> | control and status | x-------------x >>>>> | space | | | >>>>> x-------------------------x |Timer/Counter| >>>>> | | >>>>> x-------------x >>>>> TGU Configuration in Hardware >>>>> >>>>> The TGU provides a step region for user configuration, similar >>>>> to a flow chart. Each step region consists of three register clusters: >>>>> >>>>> 1.Priority Region: Sets the required signals with priority. >>>>> 2.Condition Region: Defines specific requirements (e.g., signal A >>>>> reaches three times) and the subsequent action once the requirement is >>>>> met. >>>>> 3.Timer/Counter (Optional): Provides timing or counting functionality. >>>>> >>>>> Add a new coresight-tgu.yaml file to describe the bindings required to >>>>> define the TGU in the device trees. >>>>> >>>>> Signed-off-by: songchai<quic_songchai@...cinc.com> >>>> It feels like you are using login name as real name. Please investigate >>>> this and confirm whether latin transcription/transliteration of your >>>> name is like above. >>> yes.. it's my login name. Will use my real name in next version. >>>>> --- >>>>> .../bindings/arm/qcom,coresight-tgu.yaml | 136 ++++++++++++++++++ >>>>> 1 file changed, 136 insertions(+) >>>>> create mode 100644 Documentation/devicetree/bindings/arm/qcom,coresight-tgu.yaml >>>>> >>>>> diff --git a/Documentation/devicetree/bindings/arm/qcom,coresight-tgu.yaml b/Documentation/devicetree/bindings/arm/qcom,coresight-tgu.yaml >>>>> new file mode 100644 >>>>> index 000000000000..c261252e33e0 >>>>> --- /dev/null >>>>> +++ b/Documentation/devicetree/bindings/arm/qcom,coresight-tgu.yaml >>>>> @@ -0,0 +1,136 @@ >>>>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause >>>>> +# Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved. >>>>> +%YAML 1.2 >>>>> +--- >>>>> +$id:http://devicetree.org/schemas/arm/qcom,coresight-tgu.yaml# >>>>> +$schema:http://devicetree.org/meta-schemas/core.yaml# >>>>> + >>>>> +title: Trigger Generation Unit - TGU >>>>> + >>>>> +description: | >>>>> + The Trigger Generation Unit (TGU) is a Data Engine which can be utilized >>>>> + to sense a plurality of signals and create a trigger into the CTI or >>>>> + generate interrupts to processors. The TGU is like the trigger circuit >>>>> + of a Logic Analyzer.The corresponding trigger logic can be realized by >>>>> + configuring the conditions for each step after sensing the signal. >>>>> + Once setup and enabled, it will observe sense inputs and based upon >>>>> + the activity of those inputs, even over clock cycles, may detect a >>>>> + preprogrammed state/sequence and then produce a trigger or interrupt. >>>>> + >>>>> + The primary use case of the TGU is to detect patterns or sequences on a >>>>> + given set of signals within some region of the SoC. >>>>> + >>>>> +maintainers: >>>>> + - Mao Jinlong<quic_jinlmao@...cinc.com> >>>>> + - Sam Chai<quic_songchai@...cinc.com> >>>>> + >>>>> +# Need a custom select here or 'arm,primecell' will match on lots of nodes >>>>> +select: >>>>> + properties: >>>>> + compatible: >>>>> + contains: >>>>> + enum: >>>>> + - qcom,coresight-tgu >>>>> + required: >>>>> + - compatible >>>>> + >>>>> +properties: >>>>> + $nodename: >>>>> + pattern: "^tgu(@[0-9a-f]+)$" >>>> Drop the pattern (and anyway @ is not optional). >>> There will be several TGUs in the SoC, and we want to use the address of >>> each to distinguish them. >> How is this related? >> >>> This is why we added the nodename pattern here. >> How is this related? >> >>> Additionally, I noticed that both TPDM and CTI also use this format to >>> define the nodename. >>> >>> Could you please share any concerns you have about using this pattern? >> I don't get why you insist, but sure: >> The name does not follow DT spec recommendation, plus child schema is >> not really supposed to define the names. > Thanks for you clarification, will drop in the next version. >> >>>>> + compatible: >>>>> + items: >>>>> + - const: qcom,coresight-tgu >>>>> + - const: arm,primecell >>>>> + >>>>> + reg: >>>>> + maxItems: 1 >>>>> + >>>>> + clocks: >>>>> + maxItems: 1 >>>>> + >>>>> + clock-names: >>>>> + items: >>>>> + - const: apb_pclk >>>>> + >>>>> + qcom,tgu-steps: >>>>> + description: >>>>> + The trigger logic is realized by configuring each step after sensing >>>>> + the signal. The parameter here is used to describe the maximum of steps >>>>> + that could be configured in the current TGU. >>>> Why this is board or SoC level property? All below also feel like >>>> unnecessary stuff from downstream. >>> There are actually four properties used to describe the number of >>> registers with different functionality for TGUs at the SoC level. >>> >>> Each TGU may have a different number of registers, so we need to add >>> these four properties to describe each TGU’s hardware design. >> Each TGU on the same SoC? > yes, in other words, there will be several TGUs in the SoC. This I understood, but I am asking if each TGU on the same SoC will have different number of registers and other properties? Best regards, Krzysztof
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