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client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by BN1PEPF00004685.mail.protection.outlook.com (10.167.243.86) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8857.21 via Frontend Transport; Wed, 18 Jun 2025 08:09:42 +0000 Received: from SATLEXMB03.amd.com (10.181.40.144) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Wed, 18 Jun 2025 03:09:41 -0500 Received: from xhdlc201964.xilinx.com (10.180.168.240) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server id 15.1.2507.39 via Frontend Transport; Wed, 18 Jun 2025 03:09:37 -0500 From: Sai Krishna Musham To: , , , , , , , CC: , , , , , , Subject: [PATCH v3 1/2] dt-bindings: PCI: amd-mdb: Add reset-gpios property for PCIe RP PERST# handling Date: Wed, 18 Jun 2025 13:39:30 +0530 Message-ID: <20250618080931.2472366-2-sai.krishna.musham@amd.com> X-Mailer: git-send-email 2.44.1 In-Reply-To: <20250618080931.2472366-1-sai.krishna.musham@amd.com> References: <20250618080931.2472366-1-sai.krishna.musham@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: None (SATLEXMB04.amd.com: sai.krishna.musham@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN1PEPF00004685:EE_|MW4PR12MB6729:EE_ X-MS-Office365-Filtering-Correlation-Id: bcfab3ec-6a2b-4491-07b3-08ddae3f7ad4 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|1800799024|82310400026|7416014|376014; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Jun 2025 08:09:42.2950 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: bcfab3ec-6a2b-4491-07b3-08ddae3f7ad4 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN1PEPF00004685.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB6729 Content-Type: text/plain; charset="utf-8" Add support for the `reset-gpios` property in the PCIe Root Port (RP) child node to handle the PERST# signal via GPIO. Update the example to reflect this addition. Signed-off-by: Sai Krishna Musham --- Changes in v3: - Move reset-gpios to PCI bridge node. Changes in v2: - Update commit message --- .../bindings/pci/amd,versal2-mdb-host.yaml | 26 +++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yam= l b/Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml index 43dc2585c237..3ffe4512650d 100644 --- a/Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml +++ b/Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml @@ -71,6 +71,21 @@ properties: - "#address-cells" - "#interrupt-cells" =20 +patternProperties: + '^pcie@[0-2],0$': + type: object + $ref: /schemas/pci/pci-pci-bridge.yaml# + + properties: + reg: + maxItems: 1 + + reset-gpios: + description: GPIO controlled connection to PERST# signal + maxItems: 1 + + unevaluatedProperties: false + required: - reg - reg-names @@ -87,6 +102,7 @@ examples: - | #include #include + #include =20 soc { #address-cells =3D <2>; @@ -112,6 +128,16 @@ examples: #size-cells =3D <2>; #interrupt-cells =3D <1>; device_type =3D "pci"; + + pcie@0,0 { + device_type =3D "pci"; + reg =3D <0x0 0x0 0x0 0x0 0x0>; + reset-gpios =3D <&tca6416_u37 7 GPIO_ACTIVE_LOW>; + #address-cells =3D <3>; + #size-cells =3D <2>; + ranges; + }; + pcie_intc_0: interrupt-controller { #address-cells =3D <0>; #interrupt-cells =3D <1>; --=20 2.43.0