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X-OriginatorOrg: topic.nl X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Jun 2025 14:39:31.1400 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1a497a5f-6ed2-4d9a-dad0-08dda82c9c5a X-MS-Exchange-CrossTenant-Id: 449607a5-3517-482d-8d16-41dd868cbda3 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=449607a5-3517-482d-8d16-41dd868cbda3;Ip=[13.93.42.39];Helo=[westeu12-emailsignatures-cloud.codetwo.com] X-MS-Exchange-CrossTenant-AuthSource: AM1PEPF000252DB.eurprd07.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PA1PR04MB11383 Support providing the PERST# reset signal through a devicetree binding. Thus the system no longer relies on external components to perform the bus reset. Signed-off-by: Mike Looijmans --- Changes in v4: Adapt patch description to "PCI: xilinx:" format Changes in v3: Include linux/gpio/consumer.h Message "Failed to request reset GPIO" Use PCIE_T_PVPERL_MS and PCIE_T_RRS_READY_MS Dropped dt-bindings patch, not needed Changes in v2: Split into "reset GPIO" and "wait for link" patches Handle GPIO defer and/or errors drivers/pci/controller/pcie-xilinx.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/= pcie-xilinx.c index e8a07535539e..92aa4f3528aa 100644 --- a/drivers/pci/controller/pcie-xilinx.c +++ b/drivers/pci/controller/pcie-xilinx.c @@ -10,6 +10,7 @@ * ARM PCI Host generic driver. */ =20 +#include #include #include #include @@ -576,11 +577,17 @@ static int xilinx_pcie_probe(struct platform_device *= pdev) struct device *dev =3D &pdev->dev; struct xilinx_pcie *pcie; struct pci_host_bridge *bridge; + struct gpio_desc *perst_gpio; int err; =20 if (!dev->of_node) return -ENODEV; =20 + perst_gpio =3D devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(perst_gpio)) + return dev_err_probe(dev, PTR_ERR(perst_gpio), + "Failed to request reset GPIO\n"); + bridge =3D devm_pci_alloc_host_bridge(dev, sizeof(*pcie)); if (!bridge) return -ENODEV; @@ -595,6 +602,13 @@ static int xilinx_pcie_probe(struct platform_device *p= dev) return err; } =20 + if (perst_gpio) { + msleep(PCIE_T_PVPERL_MS); /* Minimum assertion time */ + gpiod_set_value_cansleep(perst_gpio, 0); + /* Initial delay to provide endpoint time to initialize */ + msleep(PCIE_T_RRS_READY_MS); + } + xilinx_pcie_init_port(pcie); =20 err =3D xilinx_pcie_init_irq_domain(pcie); --=20 2.43.0 base-commit: f09079bd04a924c72d555cd97942d5f8d7eca98c branch: linux-master-pci-reset Met vriendelijke groet / kind regards,=0A= =0A= Mike Looijmans=0A= System Expert=0A= =0A= =0A= TOPIC Embedded Products B.V.=0A= Materiaalweg 4, 5681 RJ Best=0A= The Netherlands=0A= =0A= T: +31 (0) 499 33 69 69=0A= E: mike.looijmans@topic.nl=0A= W: www.topic.nl=0A= =0A= Please consider the environment before printing this e-mail=0A=