From patchwork Fri Sep 29 14:28:42 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gatien CHEVALLIER X-Patchwork-Id: 13404420 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 61E35E71D45 for ; Fri, 29 Sep 2023 14:31:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ozKq3gYE+71E3BQLWOQ/yus/7ge2W42oitCVo8G5W60=; b=ugiSHJvvNdrVYY Gsw4SiZH9946WeucRrVplnYPDfTmaC8mr9bZNJmGFLR3tWuiZqf2l4eozSpkBiQMw3IxO5Tk8Gp/y 8UdZ5MbK/Ig8OSsv/+r3YyjN6fSmeNjSnWe0T7aC0wZtE4VtN9kx4+FL7UKkM5XjvtxOXiQAZsL6I FT/BDgzBiNgFQhT5oFl7KlcAKdEoP8GmolUDDSA4z/sl5zns5Fl0GkH3pqMNLZHrdx9PNvB+4pi07 9KrH1wh3vE7ELoGDdismSJx/xvjWpCx+wtwP3q64YgKDkpoi8DeLAuy3VJ3uYSWN/qhdoUt0+fXQv if49iqrtg0/fXYyxoHhQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qmEWI-0083Sh-1G; Fri, 29 Sep 2023 14:31:06 +0000 Received: from mx07-00178001.pphosted.com ([185.132.182.106]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qmEWF-0083R9-14; Fri, 29 Sep 2023 14:31:05 +0000 Received: from pps.filterd (m0288072.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.17.1.22/8.17.1.22) with ESMTP id 38T9Uo5C014981; Fri, 29 Sep 2023 16:30:36 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h= from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding:content-type; s= selector1; bh=wMdvbc/s3rnb/ovKUDIU9tRdReiTt7f+2PAGC4pEICU=; b=pn YRuhCzRKv0NQRRTONfBRC98bI0ys0nYTYj8GU6LUYPV7q+tYnWbxRdCTxYO1m3nQ Mu5zN2x0MtxeMlDpEqF71qjkjjSoLd/4Fc+UxTNQSBGYv73baAajknEgq9B4VrrZ Ltb318nm0FUiJdBspTEvA98ahxtFMjn0X9fRb2W1ggmEKkUgtySHfzDr5NaaU0eq mKbeH5qTnba0AryD+uvC1qOJIOXrbJc6v1wVOJUt0EmhFDaxFLWxXjGabuxy9g6D 3+7QVhqVus889rvJWE1LOrO6IPM68fps6Yff/GzzRiK7ifOAvSLCtAY1I73AE4AI 4v2EG29vyYOCg42mPLaw== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com (PPS) with ESMTPS id 3t9neg3sme-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 29 Sep 2023 16:30:36 +0200 (MEST) Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id A76A2100058; Fri, 29 Sep 2023 16:30:35 +0200 (CEST) Received: from Webmail-eu.st.com (shfdag1node1.st.com [10.75.129.69]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 9CAB326A9A2; Fri, 29 Sep 2023 16:30:35 +0200 (CEST) Received: from localhost (10.201.20.32) by SHFDAG1NODE1.st.com (10.75.129.69) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.27; Fri, 29 Sep 2023 16:30:35 +0200 From: Gatien Chevallier To: , , , , , , , , , , , , , , , , , , , , , , , , , Frank Rowand , CC: , , , , , , , , , , , , , , , , Oleksii Moisieiev , Gatien Chevallier Subject: [PATCH v5 01/11] dt-bindings: document generic access controller Date: Fri, 29 Sep 2023 16:28:42 +0200 Message-ID: <20230929142852.578394-2-gatien.chevallier@foss.st.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230929142852.578394-1-gatien.chevallier@foss.st.com> References: <20230929142852.578394-1-gatien.chevallier@foss.st.com> MIME-Version: 1.0 X-Originating-IP: [10.201.20.32] X-ClientProxiedBy: SHFCAS1NODE2.st.com (10.75.129.73) To SHFDAG1NODE1.st.com (10.75.129.69) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-09-29_13,2023-09-28_03,2023-05-22_02 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230929_073103_710214_65DA9B8C X-CRM114-Status: GOOD ( 20.27 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Oleksii Moisieiev Introducing of the generic access controller bindings for the access controller provider and consumer devices. Those bindings are intended to allow a better handling of accesses to resources in a hardware architecture supporting several compartments. This patch is based on [1]. It is integrated in this patchset as it provides a use-case for it. Diffs with [1]: - Rename feature-domain* properties to access-control* to narrow down the scope of the binding - YAML errors and typos corrected. - Example updated - Some rephrasing in the binding description [1]: https://lore.kernel.org/lkml/0c0a82bb-18ae-d057-562b Signed-off-by: Oleksii Moisieiev Signed-off-by: Gatien Chevallier --- Changes in V5: - Diffs with [1] - Discarded the [IGNORE] tag as the patch is now part of the patchset .../access-controllers/access-controller.yaml | 90 +++++++++++++++++++ 1 file changed, 90 insertions(+) create mode 100644 Documentation/devicetree/bindings/access-controllers/access-controller.yaml diff --git a/Documentation/devicetree/bindings/access-controllers/access-controller.yaml b/Documentation/devicetree/bindings/access-controllers/access-controller.yaml new file mode 100644 index 000000000000..9d305fccc333 --- /dev/null +++ b/Documentation/devicetree/bindings/access-controllers/access-controller.yaml @@ -0,0 +1,90 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/access-controllers/access-controller.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Generic Domain Access Controller + +maintainers: + - Oleksii Moisieiev + +description: |+ + Common access controllers properties + + Access controllers are in charge of stating which of the hardware blocks under + their responsibility (their domain) can be accesssed by which compartment. A + compartment can be a cluster of CPUs (or coprocessors), a range of addresses + or a group of hardware blocks. An access controller's domain is the set of + resources covered by the access controller. + + This device tree bindings can be used to bind devices to their access + controller provided by access-controller property. In this case, the device is + a consumer and the access controller is the provider. + + An access controller can be represented by any node in the device tree and + can provide one or more configuration parameters, needed to control parameters + of the consumer device. A consumer node can refer to the provider by phandle + and a set of phandle arguments, specified by '#access-controller-cells' + property in the access controller node. + + Access controllers are typically used to set/read the permissions of a + hardware block and grant access to it. Any of which depends on the access + controller. The capabilities of each access controller are defined by the + binding of the access controller device. + + Each node can be a consumer for the several access controllers. + +# always select the core schema +select: true + +properties: + "#access-controller-cells": + $ref: /schemas/types.yaml#/definitions/uint32 + description: + Number of cells in a access-controller specifier; + Can be any value as specified by device tree binding documentation + of a particular provider. + + access-control-provider: + description: + Indicates that the node is an access controller. + + access-controller-names: + $ref: /schemas/types.yaml#/definitions/string-array + description: + A list of access-controller names, sorted in the same order as + access-controller entries. Consumer drivers will use + access-controller-names to match with existing access-controller entries. + + access-controller: + $ref: /schemas/types.yaml#/definitions/phandle-array + description: + A list of access controller specifiers, as defined by the + bindings of the access-controller provider. + +additionalProperties: true + +examples: + - | + uart_controller: access-controller@50000 { + reg = <0x50000 0x10>; + access-control-provider; + #access-controller-cells = <2>; + }; + + bus_controller: bus@60000 { + reg = <0x60000 0x10000>; + #address-cells = <1>; + #size-cells = <1>; + ranges; + access-control-provider; + #access-controller-cells = <3>; + + uart4: serial@60100 { + reg = <0x60100 0x400>; + access-controller = <&uart_controller 1 2>, + <&bus_controller 1 3 5>; + access-controller-names = "controller", "bus-controller"; + }; + };