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client-ip=165.204.84.17; helo=SATLEXMB03.amd.com; pr=C Received: from SATLEXMB03.amd.com (165.204.84.17) by BY1PEPF0001AE1B.mail.protection.outlook.com (10.167.242.103) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8489.16 via Frontend Transport; Wed, 26 Feb 2025 12:44:10 +0000 Received: from SATLEXMB04.amd.com (10.181.40.145) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Wed, 26 Feb 2025 06:44:09 -0600 Received: from xhdlc210316.xilinx.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server id 15.1.2507.39 via Frontend Transport; Wed, 26 Feb 2025 06:44:06 -0600 From: Sai Krishna Musham To: , , , , , , CC: , , , , , , Subject: [PATCH v2 1/2] dt-bindings: PCI: xilinx-cpm: Add reset-gpios for PCIe RP PERST# Date: Wed, 26 Feb 2025 18:13:57 +0530 Message-ID: <20250226124358.88227-2-sai.krishna.musham@amd.com> X-Mailer: git-send-email 2.44.1 In-Reply-To: <20250226124358.88227-1-sai.krishna.musham@amd.com> References: <20250226124358.88227-1-sai.krishna.musham@amd.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Received-SPF: None (SATLEXMB03.amd.com: sai.krishna.musham@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BY1PEPF0001AE1B:EE_|MW4PR12MB6681:EE_ X-MS-Office365-Filtering-Correlation-Id: 3c024200-1baa-4671-baa8-08dd56634457 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|376014|7416014|36860700013|13003099007; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Feb 2025 12:44:10.3110 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3c024200-1baa-4671-baa8-08dd56634457 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=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BY1PEPF0001AE1B.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB6681 Introduce `reset-gpios` property to enable GPIO-based control of the PCIe RP PERST# signal, generating assert and deassert signals. Traditionally, the reset was managed in hardware and enabled during initialization. With this patch set, the reset will be handled by the driver. Consequently, the `reset-gpios` property must be explicitly provided to ensure proper functionality. Signed-off-by: Sai Krishna Musham --- This patch depends on the following patch series. https://lore.kernel.org/all/20250217072713.635643-2-thippeswamy.havalige@amd.com/ Changes for v2: - Add define from include/dt-bindings/gpio/gpio.h for PERST# polarity - Update commit message --- .../devicetree/bindings/pci/xilinx-versal-cpm.yaml | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/devicetree/bindings/pci/xilinx-versal-cpm.yaml b/Documentation/devicetree/bindings/pci/xilinx-versal-cpm.yaml index b63a759ec2d7..6aaeb76f498b 100644 --- a/Documentation/devicetree/bindings/pci/xilinx-versal-cpm.yaml +++ b/Documentation/devicetree/bindings/pci/xilinx-versal-cpm.yaml @@ -33,6 +33,9 @@ properties: - const: cpm_csr minItems: 2 + reset-gpios: + description: GPIO used as PERST# signal. Please refer to pci.txt. + interrupts: maxItems: 1 @@ -63,6 +66,7 @@ properties: required: - reg - reg-names + - reset-gpios - "#interrupt-cells" - interrupts - interrupt-map @@ -75,6 +79,7 @@ unevaluatedProperties: false examples: - | + #include versal { #address-cells = <2>; @@ -99,6 +104,7 @@ examples: reg = <0x0 0xfca10000 0x0 0x1000>, <0x6 0x00000000 0x0 0x10000000>; reg-names = "cpm_slcr", "cfg"; + reset-gpios = <&gpio1 38 GPIO_ACTIVE_LOW>; pcie_intc_0: interrupt-controller { #address-cells = <0>; #interrupt-cells = <1>; @@ -127,6 +133,7 @@ examples: <0x06 0x00000000 0x00 0x1000000>, <0x00 0xfce20000 0x00 0x1000000>; reg-names = "cpm_slcr", "cfg", "cpm_csr"; + reset-gpios = <&gpio1 38 GPIO_ACTIVE_LOW>; pcie_intc_1: interrupt-controller { #address-cells = <0>; From patchwork Wed Feb 26 12:43:58 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sai Krishna Musham X-Patchwork-Id: 13992314 X-Patchwork-Delegate: kw@linux.com Received: from NAM10-DM6-obe.outbound.protection.outlook.com (mail-dm6nam10on2041.outbound.protection.outlook.com [40.107.93.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 507C421B9CC; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Feb 2025 12:44:13.9823 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3bb03b16-39a8-4391-edd7-08dd56634687 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=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BY1PEPF0001AE16.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB6840 Add GPIO-based control for the PCIe Root Port PERST# signal. According to section 2.2 of the PCIe Electromechanical Specification (Revision 6.0), PERST# signal has to be deasserted after a delay of 100 ms (TPVPERL) to ensure proper reset sequencing during PCIe initialization. Adapt to use the GPIO framework and make reset optional to keep DTB backward compatibility. Signed-off-by: Sai Krishna Musham --- This patch depends on the following patch series. https://lore.kernel.org/all/20250217072713.635643-3-thippeswamy.havalige@amd.com/ Changes for v2: - Make the request GPIO optional. - Correct the reset sequence as per PERST# - Update commit message --- drivers/pci/controller/pcie-xilinx-cpm.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/pci/controller/pcie-xilinx-cpm.c b/drivers/pci/controller/pcie-xilinx-cpm.c index 81e8bfae53d0..aa0c61d30049 100644 --- a/drivers/pci/controller/pcie-xilinx-cpm.c +++ b/drivers/pci/controller/pcie-xilinx-cpm.c @@ -6,6 +6,8 @@ */ #include +#include +#include #include #include #include @@ -568,8 +570,29 @@ static int xilinx_cpm_pcie_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct pci_host_bridge *bridge; struct resource_entry *bus; + struct gpio_desc *reset_gpio; int err; + /* Request the GPIO for PCIe reset signal */ + reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(reset_gpio)) { + dev_err(dev, "Failed to request reset GPIO\n"); + return PTR_ERR(reset_gpio); + } + + /* Assert the reset signal */ + gpiod_set_value(reset_gpio, 1); + + /* + * As per section 2.2 of the PCI Express Card Electromechanical + * Specification (Revision 6.0), the deassertion of the PERST# signal + * should be delayed by 100 ms (TPVPERL). + */ + msleep(100); + + /* Deassert the reset signal */ + gpiod_set_value(reset_gpio, 0); + bridge = devm_pci_alloc_host_bridge(dev, sizeof(*port)); if (!bridge) return -ENODEV;