From patchwork Fri Jan 27 16:40:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gatien CHEVALLIER X-Patchwork-Id: 13119001 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C21CCC64EC5 for ; Fri, 27 Jan 2023 16:42:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235033AbjA0QmN (ORCPT ); Fri, 27 Jan 2023 11:42:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35648 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235006AbjA0QmL (ORCPT ); Fri, 27 Jan 2023 11:42:11 -0500 Received: from mx07-00178001.pphosted.com (mx08-00178001.pphosted.com [91.207.212.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BCF1E7CC8C; Fri, 27 Jan 2023 08:42:08 -0800 (PST) Received: from pps.filterd (m0046661.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 30RECpOp030161; Fri, 27 Jan 2023 17:41:26 +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=th2tLwr42ahTZJ1iv4VP8LnTeu3dyxVJFUaVFvpn8jc=; b=R5MJIHXHOpIWy88Nn531oxNSe1SQAOsFZIo3S5j9Dh7ehLaGn06gjT5k5e8XQqU8jLYm S+gU/H5b0cW1tXC8MhTdpfHyrNvHQ4B01dLauBPpSvHT/vPOWP2qzfREWFsE9vSrl4g8 Hlp5onquIjg+hKcsab4BsD60Nr5bHPaBdQiOn4XURtTmhh3O9Y7cEbaWjKGrlnA44shu RpdOBWNsoD2hh7b9LCIF5q6f0jWk13hu/pozS7UhipATLybl84HJCOvaZHtMKqoSEtti T4Q3bUaNilKO5SSh46wSSMrbPQmZCBqecG5D81Q+P4TlOQLJsQBxh+pr14j4ZaCIvvsP Aw== 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 3najx6xg2n-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 27 Jan 2023 17:41:26 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id E5467100039; Fri, 27 Jan 2023 17:41:23 +0100 (CET) Received: from Webmail-eu.st.com (shfdag1node1.st.com [10.75.129.69]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id DC76E21D3FC; Fri, 27 Jan 2023 17:41:23 +0100 (CET) Received: from localhost (10.201.21.177) 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 15.1.2507.13; Fri, 27 Jan 2023 17:41:23 +0100 From: Gatien Chevallier To: , , , , , , , , , , , , , , , , CC: , , , , , , , , , , , , , , , , Gatien Chevallier , Loic PALLARDY Subject: [PATCH v3 3/6] dt-bindings: bus: add STM32 System Bus Date: Fri, 27 Jan 2023 17:40:37 +0100 Message-ID: <20230127164040.1047583-4-gatien.chevallier@foss.st.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20230127164040.1047583-1-gatien.chevallier@foss.st.com> References: <20230127164040.1047583-1-gatien.chevallier@foss.st.com> MIME-Version: 1.0 X-Originating-IP: [10.201.21.177] 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:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.122.1 definitions=2023-01-27_10,2023-01-27_01,2022-06-22_01 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org Document STM32 System Bus. This bus is intended to control firewall access for the peripherals connected to it. Signed-off-by: Gatien Chevallier Signed-off-by: Loic PALLARDY --- Changes in V2: - Corrected errors highlighted by Rob's robot - Re-ordered Signed-off-by tags Changes in V3: - Correct #feature-domain-cells - Declare 1 as minimum number of arguments for feature-domains property in bus subnodes and 3 as maximum. - Change example to be a real usecase. .../devicetree/bindings/bus/st,sys-bus.yaml | 127 ++++++++++++++++++ 1 file changed, 127 insertions(+) create mode 100644 Documentation/devicetree/bindings/bus/st,sys-bus.yaml diff --git a/Documentation/devicetree/bindings/bus/st,sys-bus.yaml b/Documentation/devicetree/bindings/bus/st,sys-bus.yaml new file mode 100644 index 000000000000..c1510784b79b --- /dev/null +++ b/Documentation/devicetree/bindings/bus/st,sys-bus.yaml @@ -0,0 +1,127 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/bus/st,sys-bus.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: STM32 System Bus + +description: | + The STM32 System Bus is an internal bus to which some internal peripherals + are connected. STM32 System Bus integrates a firewall controlling access to each + device. This bus prevents non-accessible devices to be probed. + + To see which peripherals are securable, please check the SoC reference manual. + +maintainers: + - Gatien Chevallier + +allOf: + - $ref: /schemas/feature-controllers/feature-domain-controller.yaml# + +properties: + compatible: + enum: + - st,stm32mp13-sys-bus + - st,stm32mp15-sys-bus + + reg: + maxItems: 1 + + "#address-cells": + const: 1 + + "#size-cells": + const: 1 + + "#feature-domain-cells": + const: 1 + + ranges: true + + feature-domain-controller: true + +patternProperties: + "^.*@[0-9a-f]+$": + description: Devices attached to system bus + type: object + properties: + feature-domains: + $ref: /schemas/feature-controllers/feature-domain-controller.yaml#/properties/feature-domains + minItems: 1 + maxItems: 3 + +required: + - compatible + - reg + - "#address-cells" + - "#size-cells" + - feature-domain-controller + - "#feature-domain-cells" + - ranges + +additionalProperties: false + +examples: + - | + // In this example, the rng1 device refers to etzpc as its domain controller. + // Same goes for fmc. + // Access rights are verified before creating devices. + + #include + #include + #include + + etzpc: bus@5c007000 { + compatible = "st,stm32mp15-sys-bus"; + reg = <0x5c007000 0x400>; + #address-cells = <1>; + #size-cells = <1>; + ranges; + feature-domain-controller; + #feature-domain-cells = <1>; + + rng1: rng@54003000 { + compatible = "st,stm32-rng"; + reg = <0x54003000 0x400>; + clocks = <&rcc RNG1_K>; + resets = <&rcc RNG1_R>; + feature-domains = <&etzpc 7>; + status = "disabled"; + }; + + fmc: memory-controller@58002000 { + #address-cells = <2>; + #size-cells = <1>; + compatible = "st,stm32mp1-fmc2-ebi"; + reg = <0x58002000 0x1000>; + clocks = <&rcc FMC_K>; + resets = <&rcc FMC_R>; + feature-domains = <&etzpc 91>; + status = "disabled"; + + ranges = <0 0 0x60000000 0x04000000>, /* EBI CS 1 */ + <1 0 0x64000000 0x04000000>, /* EBI CS 2 */ + <2 0 0x68000000 0x04000000>, /* EBI CS 3 */ + <3 0 0x6c000000 0x04000000>, /* EBI CS 4 */ + <4 0 0x80000000 0x10000000>; /* NAND */ + + nand-controller@4,0 { + #address-cells = <1>; + #size-cells = <0>; + compatible = "st,stm32mp1-fmc2-nfc"; + reg = <4 0x00000000 0x1000>, + <4 0x08010000 0x1000>, + <4 0x08020000 0x1000>, + <4 0x01000000 0x1000>, + <4 0x09010000 0x1000>, + <4 0x09020000 0x1000>; + interrupts = ; + dmas = <&mdma1 20 0x2 0x12000a02 0x0 0x0>, + <&mdma1 20 0x2 0x12000a08 0x0 0x0>, + <&mdma1 21 0x2 0x12000a0a 0x0 0x0>; + dma-names = "tx", "rx", "ecc"; + status = "disabled"; + }; + }; + };