From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AC0DFC433DB for ; Wed, 27 Jan 2021 09:58:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5A1642076E for ; Wed, 27 Jan 2021 09:58:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235525AbhA0J6j (ORCPT ); Wed, 27 Jan 2021 04:58:39 -0500 Received: from foss.arm.com ([217.140.110.172]:32942 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233880AbhA0I7I (ORCPT ); Wed, 27 Jan 2021 03:59:08 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id ED6A41478; Wed, 27 Jan 2021 00:55:42 -0800 (PST) Received: from p8cg001049571a15.arm.com (unknown [10.163.91.246]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id C58723F66B; Wed, 27 Jan 2021 00:55:39 -0800 (PST) From: Anshuman Khandual To: linux-arm-kernel@lists.infradead.org, coresight@lists.linaro.org Cc: mathieu.poirier@linaro.org, suzuki.poulose@arm.com, mike.leach@linaro.org, lcherian@marvell.com, linux-kernel@vger.kernel.org, Anshuman Khandual , devicetree@vger.kernel.org, Rob Herring Subject: [PATCH V3 06/14] dts: bindings: Document device tree bindings for ETE Date: Wed, 27 Jan 2021 14:25:30 +0530 Message-Id: <1611737738-1493-7-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1611737738-1493-1-git-send-email-anshuman.khandual@arm.com> References: <1611737738-1493-1-git-send-email-anshuman.khandual@arm.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Suzuki K Poulose Document the device tree bindings for Embedded Trace Extensions. ETE can be connected to legacy coresight components and thus could optionally contain a connection graph as described by the CoreSight bindings. Cc: devicetree@vger.kernel.org Cc: Mathieu Poirier Cc: Mike Leach Cc: Rob Herring Signed-off-by: Suzuki K Poulose Signed-off-by: Anshuman Khandual --- Changes in V3: - Fixed all DT yaml semantics problems Documentation/devicetree/bindings/arm/ete.yaml | 74 ++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 Documentation/devicetree/bindings/arm/ete.yaml diff --git a/Documentation/devicetree/bindings/arm/ete.yaml b/Documentation/devicetree/bindings/arm/ete.yaml new file mode 100644 index 0000000..edc1fe2 --- /dev/null +++ b/Documentation/devicetree/bindings/arm/ete.yaml @@ -0,0 +1,74 @@ +# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause +# Copyright 2021, Arm Ltd +%YAML 1.2 +--- +$id: "http://devicetree.org/schemas/arm/ete.yaml#" +$schema: "http://devicetree.org/meta-schemas/core.yaml#" + +title: ARM Embedded Trace Extensions + +maintainers: + - Suzuki K Poulose + - Mathieu Poirier + +description: | + Arm Embedded Trace Extension(ETE) is a per CPU trace component that + allows tracing the CPU execution. It overlaps with the CoreSight ETMv4 + architecture and has extended support for future architecture changes. + The trace generated by the ETE could be stored via legacy CoreSight + components (e.g, TMC-ETR) or other means (e.g, using a per CPU buffer + Arm Trace Buffer Extension (TRBE)). Since the ETE can be connected to + legacy CoreSight components, a node must be listed per instance, along + with any optional connection graph as per the coresight bindings. + See bindings/arm/coresight.txt. + +properties: + $nodename: + pattern: "^ete([0-9a-f]+)$" + compatible: + items: + - const: arm,embedded-trace-extension + + cpu: + description: | + Handle to the cpu this ETE is bound to. + $ref: /schemas/types.yaml#/definitions/phandle + + out-ports: + type: object + description: | + Output connections from the ETE to legacy CoreSight trace bus. + properties: + port: + $ref: /schemas/graph.yaml#/properties/port + +required: + - compatible + - cpu + +additionalProperties: false + +examples: + +# An ETE node without legacy CoreSight connections + - | + ete0 { + compatible = "arm,embedded-trace-extension"; + cpu = <&cpu_0>; + }; +# An ETE node with legacy CoreSight connections + - | + ete1 { + compatible = "arm,embedded-trace-extension"; + cpu = <&cpu_1>; + + out-ports { /* legacy coresight connection */ + port { + ete1_out_port: endpoint { + remote-endpoint = <&funnel_in_port0>; + }; + }; + }; + }; + +... -- 2.7.4