From patchwork Tue Dec 12 15:23:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gatien CHEVALLIER X-Patchwork-Id: 13489498 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=foss.st.com header.i=@foss.st.com header.b="P5a0uB+d" Received: from mx07-00178001.pphosted.com (mx08-00178001.pphosted.com [91.207.212.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B74EB100; Tue, 12 Dec 2023 07:25:03 -0800 (PST) Received: from pps.filterd (m0046661.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.17.1.22/8.17.1.22) with ESMTP id 3BCCqu7T030022; Tue, 12 Dec 2023 16:24:06 +0100 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=JpXp2EJHxY+VtUUSPxkkTyJMNNq/ux4P17gSFHI+E8k=; b=P5 a0uB+dKMINb+zPuc568irPju8xw51gybAQYBQqrkUxMu3M/daUwzLeBEMD67Z2pW ZH7PDLmlDrfr/B4lVLS62uSacZ8JiKYyAenA/x5fmTYwYB15heyGh8kTJgJvsuQD nOz17WrlMaFrPtHehUiLXYUtOzkQH+B35JMddfZeBL7C1Y/9mRxvGId44wPvcQkH ZdFozR/5Tbj7PdKW+F1yDiqRLPzvxFskqZmlwOKJrkldl/c9NYieo3Ea4A7LIhBO Lb/s9OGh50jT5E2CVdlCnKbHlomgpaRMh5BHVyNnOTf9otZuPl/Nr+TMg4G/wCum 7XNZu/4Q52TZ8AlCCM3g== 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 3uvg0gusvb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 12 Dec 2023 16:24:06 +0100 (CET) Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 7F638100060; Tue, 12 Dec 2023 16:24:05 +0100 (CET) Received: from Webmail-eu.st.com (shfdag1node1.st.com [10.75.129.69]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 7435A22F7B3; Tue, 12 Dec 2023 16:24:05 +0100 (CET) Received: from localhost (10.252.7.20) 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; Tue, 12 Dec 2023 16:24:04 +0100 From: Gatien Chevallier To: , , , , , , , , , , , , , , , , , , , , , , , , , Frank Rowand , , , , , CC: , , , , , , , , , , , , , , , , Oleksii Moisieiev , Gatien Chevallier Subject: [PATCH v8 01/13] dt-bindings: document generic access controllers Date: Tue, 12 Dec 2023 16:23:44 +0100 Message-ID: <20231212152356.345703-2-gatien.chevallier@foss.st.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231212152356.345703-1-gatien.chevallier@foss.st.com> References: <20231212152356.345703-1-gatien.chevallier@foss.st.com> Precedence: bulk X-Mailing-List: linux-spi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: EQNCAS1NODE3.st.com (10.75.129.80) To SHFDAG1NODE1.st.com (10.75.129.69) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-12_09,2023-12-12_01,2023-05-22_02 From: Oleksii Moisieiev Introducing of the generic access controllers 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 Reviewed-by: Rob Herring --- Changes in V6: - Renamed access-controller to access-controllers - Example updated - Removal of access-control-provider property Changes in V5: - Diffs with [1] - Discarded the [IGNORE] tag as the patch is now part of the patchset .../access-controllers.yaml | 84 +++++++++++++++++++ 1 file changed, 84 insertions(+) create mode 100644 Documentation/devicetree/bindings/access-controllers/access-controllers.yaml diff --git a/Documentation/devicetree/bindings/access-controllers/access-controllers.yaml b/Documentation/devicetree/bindings/access-controllers/access-controllers.yaml new file mode 100644 index 000000000000..99e2865f0e46 --- /dev/null +++ b/Documentation/devicetree/bindings/access-controllers/access-controllers.yaml @@ -0,0 +1,84 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/access-controllers/access-controllers.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Generic Domain Access Controllers + +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 binding can be used to bind devices to their access + controller provided by access-controllers 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": + description: + Number of cells in an access-controllers specifier; + Can be any value as specified by device tree binding documentation + of a particular provider. The node is an access controller. + + access-controller-names: + $ref: /schemas/types.yaml#/definitions/string-array + description: + A list of access-controllers names, sorted in the same order as + access-controllers entries. Consumer drivers will use + access-controller-names to match with existing access-controllers entries. + + access-controllers: + $ref: /schemas/types.yaml#/definitions/phandle-array + description: + A list of access controller specifiers, as defined by the + bindings of the access-controllers provider. + +additionalProperties: true + +examples: + - | + clock_controller: access-controllers@50000 { + reg = <0x50000 0x400>; + #access-controller-cells = <2>; + }; + + bus_controller: bus@60000 { + reg = <0x60000 0x10000>; + #address-cells = <1>; + #size-cells = <1>; + ranges; + #access-controller-cells = <3>; + + uart4: serial@60100 { + reg = <0x60100 0x400>; + clocks = <&clk_serial>; + access-controllers = <&clock_controller 1 2>, + <&bus_controller 1 3 5>; + access-controller-names = "clock", "bus"; + }; + };