From patchwork Mon Dec 2 10:14:39 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peng Fan X-Patchwork-Id: 11268905 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9771B109A for ; Mon, 2 Dec 2019 10:14:53 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 70FE52464F for ; Mon, 2 Dec 2019 10:14:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="eTk8ZW81"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=nxp.com header.i=@nxp.com header.b="pP1XYIhU" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 70FE52464F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=nxp.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:In-Reply-To:References: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=gbAiGgaqSuhzq0tvHX5UVwi7rFGMqCmVyD59o3E0B+c=; b=eTk8ZW81pMcXfo o3PStrCV8wjbM5Z8bt+WxfXakKAGpdTheis3XVrbm0bf/4HnLI3fZVMmq///uh/aC+giwvLBSyweW nC14e3nyEcx0KM0DPy33ktnhwZxIwTsmr9keZvxvYAD7zk6CSHwWxTJeGOHQA3HMWJ6Ce5B8w6wzm kfqopYiCcl/rj025g105KoU6K+L//2gbHjtFi/6U9mbNSMLK2Oq1yNALJDFPI71L0d41foR8kCiLN Lfh0mBP44Td0IxAO3d0fIllQXYtaZdHpUd0AEnhAxEzaekDAjIZr3hGzgjKK84e2VIz3UUO2M/Tbn BlA2y+fMcF5zW3BNGjqw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1ibijD-00084U-47; Mon, 02 Dec 2019 10:14:51 +0000 Received: from mail-eopbgr20046.outbound.protection.outlook.com ([40.107.2.46] helo=EUR02-VE1-obe.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1ibij7-0007vA-V2 for linux-arm-kernel@lists.infradead.org; Mon, 02 Dec 2019 10:14:47 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=OCJ5ZAFyFOdZaS0Q6hm6uDgzbD59f5nyyC2JJ6y63JpG3LWmC2xq9GY2imsXYV+yQc7z0Vo1uvv4XWulWejkFBdbXN+xyheHqusMTNqTX8LUMKb5BGOkavQzpURvA7i9DT0nUOlDRGeUnr8W7XQkWCANTWwQ74WLbAoj6Kcg7ajwcgvtaHt2D2eBWK9+7N1GEGKu7DNRwEDY7S2JzwuGIm0GpHTmra0a2EmclFNrJck5jtN823mDf4qL4dA+pc7ee/0KH73/gJ88CorwMZPJ2OzqtqlW+z3T6W1PYQskccFS1HW5K0koqFzmjJhwzNrYtG8sIKWj1kLVYL16vuUk+Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=vGkiKn57+ceqe+yQEGCoAwwJZadA/8huVOwDRsSK/0s=; b=gJ42Tw1fOJmIZBeWWqT13a99Ohw0+YFfxgM2HHMc7R+hlZ1oMxJMETLZ0SED5V3AUoC/HwWt7mnO0JAzITmVh8EEApVbZR2KKa7DaN3x/Weg6kY8T5NBxixlRAw23uQCk9c2/bmvJlvqvUQkts7NXub1pPbwuKlqffq4l+ck+m3YU8LCfAQ4hVMYKJJ1hmPRyDXxGzL94N8SdAn2RhUcjRxolNUxxos1cJP50ETbQqJ4cYd6F+aA9w66DTFjz8cic3NTJWqGg9s8PPeuLA5zwXD4f+L9X7n9E+JNDAWBEk7S8KXqTBtdWbxWtJi0/7Sr1x+J9ZNDn4ZKl9scOX2L0Q== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nxp.com; dmarc=pass action=none header.from=nxp.com; dkim=pass header.d=nxp.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nxp.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=vGkiKn57+ceqe+yQEGCoAwwJZadA/8huVOwDRsSK/0s=; b=pP1XYIhUfGJiZ6UW3DLvb8ANiYakzzbeIDGcpMhOIvZVtqJ6hk1YUiHLKype0NVAVrCs1wx/A+qS3k+YRO1A8JrwhyV6QqSpqaTEuHVjWkfu6vwx90Z8gT3TNOINXP1mmijX+O8J3wEqgyhZ8X0ZmzyZuI4fUQ/DwHSkZvZ9/0Q= Received: from AM0PR04MB4481.eurprd04.prod.outlook.com (52.135.147.15) by AM0PR04MB4545.eurprd04.prod.outlook.com (52.135.148.159) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2495.22; Mon, 2 Dec 2019 10:14:40 +0000 Received: from AM0PR04MB4481.eurprd04.prod.outlook.com ([fe80::f16d:a26a:840:f97c]) by AM0PR04MB4481.eurprd04.prod.outlook.com ([fe80::f16d:a26a:840:f97c%4]) with mapi id 15.20.2495.014; Mon, 2 Dec 2019 10:14:40 +0000 From: Peng Fan To: "robh+dt@kernel.org" , "mark.rutland@arm.com" , "jassisinghbrar@gmail.com" , "sudeep.holla@arm.com" , "andre.przywara@arm.com" , "f.fainelli@gmail.com" Subject: [PATCH v11 1/2] dt-bindings: mailbox: add binding doc for the ARM SMC/HVC mailbox Thread-Topic: [PATCH v11 1/2] dt-bindings: mailbox: add binding doc for the ARM SMC/HVC mailbox Thread-Index: AQHVqPlO1zku/wpLsEKKv8tg+3gpuQ== Date: Mon, 2 Dec 2019 10:14:39 +0000 Message-ID: <1575281525-1549-2-git-send-email-peng.fan@nxp.com> References: <1575281525-1549-1-git-send-email-peng.fan@nxp.com> In-Reply-To: <1575281525-1549-1-git-send-email-peng.fan@nxp.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.7.4 x-clientproxiedby: HK2PR04CA0060.apcprd04.prod.outlook.com (2603:1096:202:14::28) To AM0PR04MB4481.eurprd04.prod.outlook.com (2603:10a6:208:70::15) authentication-results: spf=none (sender IP is ) smtp.mailfrom=peng.fan@nxp.com; x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [119.31.174.66] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 0b8d053d-d7ad-48c5-b128-08d777107124 x-ms-traffictypediagnostic: AM0PR04MB4545:|AM0PR04MB4545: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-forefront-prvs: 0239D46DB6 x-forefront-antispam-report: SFV:NSPM; SFS:(10009020)(4636009)(376002)(136003)(366004)(346002)(39860400002)(396003)(199004)(189003)(3846002)(316002)(66476007)(66446008)(66946007)(64756008)(66556008)(52116002)(86362001)(305945005)(8676002)(81156014)(2420400007)(15650500001)(50226002)(2501003)(256004)(71190400001)(71200400001)(2201001)(66066001)(6116002)(7736002)(2906002)(5660300002)(14454004)(7110500001)(36756003)(81166006)(8936002)(76176011)(4326008)(6306002)(6436002)(6512007)(478600001)(11346002)(25786009)(446003)(44832011)(102836004)(186003)(2616005)(99286004)(110136005)(26005)(54906003)(6506007)(386003)(6486002)(966005); DIR:OUT; SFP:1101; SCL:1; SRVR:AM0PR04MB4545; H:AM0PR04MB4481.eurprd04.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; A:1; MX:1; received-spf: None (protection.outlook.com: nxp.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: pJggaXQl0xVuZQ/HCqhS0aN1bA/cojRVmHXmRJqiyxviDpXYzfsFWFs0uPLoJ24C/H1zXO3xh9MJSXa9CZ3cwj9KFuRdiZHxrar8C5rwid7tktYF7qrosVwOjht5Nw4kAzPwJ6OqcEJbqnaw1UJieg/3sV4HLczzzv9kCFoEKkNrwzwiolzmhOjwesc7btF9RG/rvLGoIbwfgxj9CMJPOMCusiEu1y071UwROtghpNc/zb/PCf2uo1QJC2sRZNPtZA8SX5DU8c5IZJh3RnTEO+LMpX0uWP4F+yURzPJoYoDQt7UXwkGMEMvmkWNmI1WKMjKBeIpuS9XUcQSFz73dsVBPI5TAiKagsB4AiFLuTBS1FIYD2E7muT79JE+XiQ1OoYUPbQJMElkBJ0HkV+DtkAQrW1858lZtDg1Ajo+jnamGXywtrXwAi4rCsYso3mLoteyZ58yVaCBKHseGsYj3xekHOKVi6SKqUqCELQONK6A= MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0b8d053d-d7ad-48c5-b128-08d777107124 X-MS-Exchange-CrossTenant-originalarrivaltime: 02 Dec 2019 10:14:39.9235 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: wJVViv/fIs30DQ6dSBzbXCNcyq3SgLY2YZythBDNqBA74KWotPRh1C/7235F1xReE5+U+RkK50I1D+Cad8Flng== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR04MB4545 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191202_021446_045503_F20A7BAC X-CRM114-Status: GOOD ( 15.91 ) X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [40.107.2.46 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "devicetree@vger.kernel.org" , Peng Fan , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , dl-linux-imx Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Peng Fan The ARM SMC/HVC mailbox binding describes a firmware interface to trigger actions in software layers running in the EL2 or EL3 exception levels. The term "ARM" here relates to the SMC instruction as part of the ARM instruction set, not as a standard endorsed by ARM Ltd. Reviewed-by: Rob Herring Reviewed-by: Andre Przywara Reviewed-by: Florian Fainelli Signed-off-by: Peng Fan --- .../devicetree/bindings/mailbox/arm-smc.yaml | 96 ++++++++++++++++++++++ 1 file changed, 96 insertions(+) create mode 100644 Documentation/devicetree/bindings/mailbox/arm-smc.yaml diff --git a/Documentation/devicetree/bindings/mailbox/arm-smc.yaml b/Documentation/devicetree/bindings/mailbox/arm-smc.yaml new file mode 100644 index 000000000000..c165946a64e4 --- /dev/null +++ b/Documentation/devicetree/bindings/mailbox/arm-smc.yaml @@ -0,0 +1,96 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/mailbox/arm-smc.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: ARM SMC Mailbox Interface + +maintainers: + - Peng Fan + +description: | + This mailbox uses the ARM smc (secure monitor call) or hvc (hypervisor + call) instruction to trigger a mailbox-connected activity in firmware, + executing on the very same core as the caller. The value of r0/w0/x0 + the firmware returns after the smc call is delivered as a received + message to the mailbox framework, so synchronous communication can be + established. The exact meaning of the action the mailbox triggers as + well as the return value is defined by their users and is not subject + to this binding. + + One example use case of this mailbox is the SCMI interface, which uses + shared memory to transfer commands and parameters, and a mailbox to + trigger a function call. This allows SoCs without a separate management + processor (or when such a processor is not available or used) to use + this standardized interface anyway. + + This binding describes no hardware, but establishes a firmware interface. + Upon receiving an SMC using the described SMC function identifier, the + firmware is expected to trigger some mailbox connected functionality. + The communication follows the ARM SMC calling convention. + Firmware expects an SMC function identifier in r0 or w0. The supported + identifier is listed in the the arm,func-id property as described below. + The firmware can return one value in the first SMC result register, + it is expected to be an error value, which shall be propagated to the + mailbox client. + + Any core which supports the SMC or HVC instruction can be used, as long + as a firmware component running in EL3 or EL2 is handling these calls. + +properties: + compatible: + oneOf: + - description: + For implementations using ARM SMC instruction. + const: arm,smc-mbox + + - description: + For implementations using ARM HVC instruction. + const: arm,hvc-mbox + + "#mbox-cells": + const: 0 + + arm,func-id: + description: | + An single 32-bit value specifying the function ID used by the mailbox. + The function ID follows the ARM SMC calling convention standard. + $ref: /schemas/types.yaml#/definitions/uint32 + +required: + - compatible + - "#mbox-cells" + - arm,func-id + +examples: + - | + sram@93f000 { + compatible = "mmio-sram"; + reg = <0x0 0x93f000 0x0 0x1000>; + #address-cells = <1>; + #size-cells = <1>; + ranges = <0x0 0x93f000 0x1000>; + + cpu_scp_lpri: scp-shmem@0 { + compatible = "arm,scmi-shmem"; + reg = <0x0 0x200>; + }; + }; + + smc_tx_mbox: tx_mbox { + #mbox-cells = <0>; + compatible = "arm,smc-mbox"; + arm,func-id = <0xc20000fe>; + }; + + firmware { + scmi { + compatible = "arm,scmi"; + mboxes = <&smc_tx_mbox>; + mbox-names = "tx"; + shmem = <&cpu_scp_lpri>; + }; + }; + +...