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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> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net 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"; + }; + };