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a=openpgp-sha256; l=7872; i=manivannan.sadhasivam@oss.qualcomm.com; h=from:subject:message-id; bh=OVN34xQvWdQnzMzIUanYNvprU+WPc4hLhYjzqjWZYe4=; b=owEBbQGS/pANAwAKAVWfEeb+kc71AcsmYgBpDre2e1ol23eCJhpZHZQlupKAi1D9Fm3P/fwh8 VtpWH6qOKOJATMEAAEKAB0WIQRnpUMqgUjL2KRYJ5dVnxHm/pHO9QUCaQ63tgAKCRBVnxHm/pHO 9TmVB/96wWPF84FNah50vmYOPwtXOxkcaBWx630Xv2S7ArFVwWcK5E1VikWnRtFIAtWvg9EgRsE baeRH3wRl3fHLbNvgq7+wtJv/ONcUaAu5q5nF9rMn5ckGpN7ZWFus0d4QCQ+xFxAUNP5CEtehHw 0Bjv2nxKfEuYbs2eSPjd0akHjO8cco1o5xF9BDADMJw+TJRHiZvVIZDDe7cN7y8Z31FtN4MpEZJ m4v7zA8DmJYttjtsAu0yL97RhT1WVSWt3uyfwaT26RL2RQ/jy3swgSQxX/Z2PIbtKHHgFWxgUjH oIj9SKvN3zlJM6r5V+YUVhd2zLMpKyxOowcKebMxdZ93f385 X-Developer-Key: i=manivannan.sadhasivam@oss.qualcomm.com; a=openpgp; fpr=C668AEC3C3188E4C611465E7488550E901166008 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTA4MDAyNyBTYWx0ZWRfXzxgbyxc7Km2U uv0B+SNURVMHrQ9Y37M+FXO5qX7hORkDKrVM06HtGMFa0QItyJniJU3F8K9j/AvJd8JCmfD/Doj WF0+9KuhflebfALAjScqpayCmQ8kEHYRBDYevP/pVSttOpxsBwoNYk2Ad8uhDVoBP58f1cOXLey Oc56G8kILHygEq78wlbr+pLkCx6sS1ZSmGnbMbbghftlSbmOdA0dOhPmvKp2f1aVp3OTS4kidHG QCQYTU6A5pvcDt9GA5EffVdZ1wiPMNYLeqX1d3yxWxBpy4GOrAAmy5YI5BqySr9bz8vRaFoVgtC mRdhoOHa5pCRxn7nw17j52jS+PgwuDA4Bsx+gyfr7FVOx3v04b+Q/cdCFUXo7PIFTHNWADY58r+ ekR6HzIpJzDVhFxE7tI/YWGba/QS/A== X-Proofpoint-GUID: NyO6lG7M2jx42rg9n9hRa-D_wTDgwvtU X-Proofpoint-ORIG-GUID: NyO6lG7M2jx42rg9n9hRa-D_wTDgwvtU X-Authority-Analysis: v=2.4 cv=IcuKmGqa c=1 sm=1 tr=0 ts=690eb7d1 cx=c_pps a=JL+w9abYAAE89/QcEU+0QA==:117 a=qronr9GGDLuyXDLutoyxMA==:17 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=VwQbUJbxAAAA:8 a=7CQSdrXTAAAA:8 a=Mi8d0xCGeq3gkRWnbWsA:9 a=QEXdDO2ut3YA:10 a=324X-CrmTo6CU4MGRt3R:22 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-08_01,2025-11-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 bulkscore=0 suspectscore=0 spamscore=0 priorityscore=1501 phishscore=0 clxscore=1015 impostorscore=0 adultscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511080027 This driver is used to control the PCIe M.2 connectors of different Mechanical Keys attached to the host machines and supporting different interfaces like PCIe/SATA, USB/UART etc... Currently, this driver supports only the Mechanical Key M connectors with PCIe interface. The driver also only supports driving the mandatory 3.3v and optional 1.8v power supplies. The optional signals of the Key M connectors are not currently supported. Signed-off-by: Manivannan Sadhasivam --- MAINTAINERS | 7 ++ drivers/power/sequencing/Kconfig | 8 ++ drivers/power/sequencing/Makefile | 1 + drivers/power/sequencing/pwrseq-pcie-m2.c | 163 ++++++++++++++++++++++++++++++ 4 files changed, 179 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 46126ce2f968e4f9260263f1574ee29f5ff0de1c..9b3f689d1f50c62afa3772a0c6802f99a98ac2de 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -20474,6 +20474,13 @@ F: Documentation/driver-api/pwrseq.rst F: drivers/power/sequencing/ F: include/linux/pwrseq/ +PCIE M.2 POWER SEQUENCING +M: Manivannan Sadhasivam +L: linux-pci@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/connector/pcie-m2-m-connector.yaml +F: drivers/power/sequencing/pwrseq-pcie-m2.c + POWER STATE COORDINATION INTERFACE (PSCI) M: Mark Rutland M: Lorenzo Pieralisi diff --git a/drivers/power/sequencing/Kconfig b/drivers/power/sequencing/Kconfig index 280f92beb5d0ed524e67a28d1c5dd264bbd6c87e..f5fff84566ba463b55d3cd0c07db34c82f9f1e31 100644 --- a/drivers/power/sequencing/Kconfig +++ b/drivers/power/sequencing/Kconfig @@ -35,4 +35,12 @@ config POWER_SEQUENCING_TH1520_GPU GPU. This driver handles the complex clock and reset sequence required to power on the Imagination BXM GPU on this platform. +config POWER_SEQUENCING_PCIE_M2 + tristate "PCIe M.2 connector power sequencing driver" + depends on OF || COMPILE_TEST + help + Say Y here to enable the power sequencing driver for PCIe M.2 + connectors. This driver handles the power sequencing for the M.2 + connectors exposing multiple interfaces like PCIe, SATA, UART, etc... + endif diff --git a/drivers/power/sequencing/Makefile b/drivers/power/sequencing/Makefile index 96c1cf0a98ac54c9c1d65a4bb4e34289a3550fa1..0911d461829897c5018e26dbe475b28f6fb6914c 100644 --- a/drivers/power/sequencing/Makefile +++ b/drivers/power/sequencing/Makefile @@ -5,3 +5,4 @@ pwrseq-core-y := core.o obj-$(CONFIG_POWER_SEQUENCING_QCOM_WCN) += pwrseq-qcom-wcn.o obj-$(CONFIG_POWER_SEQUENCING_TH1520_GPU) += pwrseq-thead-gpu.o +obj-$(CONFIG_POWER_SEQUENCING_PCIE_M2) += pwrseq-pcie-m2.o diff --git a/drivers/power/sequencing/pwrseq-pcie-m2.c b/drivers/power/sequencing/pwrseq-pcie-m2.c new file mode 100644 index 0000000000000000000000000000000000000000..15659b009fb3e01227e40f26d633f675bc2af701 --- /dev/null +++ b/drivers/power/sequencing/pwrseq-pcie-m2.c @@ -0,0 +1,163 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries. + * Author: Manivannan Sadhasivam + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct pwrseq_pcie_m2_pdata { + const struct pwrseq_target_data **targets; +}; + +struct pwrseq_pcie_m2_ctx { + struct pwrseq_device *pwrseq; + struct device_node *of_node; + const struct pwrseq_pcie_m2_pdata *pdata; + struct regulator_bulk_data *regs; + size_t num_vregs; + struct notifier_block nb; +}; + +static int pwrseq_pcie_m2_m_vregs_enable(struct pwrseq_device *pwrseq) +{ + struct pwrseq_pcie_m2_ctx *ctx = pwrseq_device_get_drvdata(pwrseq); + + return regulator_bulk_enable(ctx->num_vregs, ctx->regs); +} + +static int pwrseq_pcie_m2_m_vregs_disable(struct pwrseq_device *pwrseq) +{ + struct pwrseq_pcie_m2_ctx *ctx = pwrseq_device_get_drvdata(pwrseq); + + return regulator_bulk_disable(ctx->num_vregs, ctx->regs); +} + +static const struct pwrseq_unit_data pwrseq_pcie_m2_vregs_unit_data = { + .name = "regulators-enable", + .enable = pwrseq_pcie_m2_m_vregs_enable, + .disable = pwrseq_pcie_m2_m_vregs_disable, +}; + +static const struct pwrseq_unit_data *pwrseq_pcie_m2_m_unit_deps[] = { + &pwrseq_pcie_m2_vregs_unit_data, + NULL +}; + +static const struct pwrseq_unit_data pwrseq_pcie_m2_m_pcie_unit_data = { + .name = "pcie-enable", + .deps = pwrseq_pcie_m2_m_unit_deps, +}; + +static const struct pwrseq_target_data pwrseq_pcie_m2_m_pcie_target_data = { + .name = "pcie", + .unit = &pwrseq_pcie_m2_m_pcie_unit_data, +}; + +static const struct pwrseq_target_data *pwrseq_pcie_m2_m_targets[] = { + &pwrseq_pcie_m2_m_pcie_target_data, + NULL +}; + +static const struct pwrseq_pcie_m2_pdata pwrseq_pcie_m2_m_of_data = { + .targets = pwrseq_pcie_m2_m_targets, +}; + +static int pwrseq_pcie_m2_match(struct pwrseq_device *pwrseq, + struct device *dev) +{ + struct pwrseq_pcie_m2_ctx *ctx = pwrseq_device_get_drvdata(pwrseq); + struct device_node *remote, *endpoint; + + /* + * Traverse the 'remote-endpoint' nodes and check if the remote node's + * parent matches the OF node of 'dev'. + */ + for_each_endpoint_of_node(ctx->of_node, endpoint) { + remote = of_graph_get_remote_port_parent(endpoint); + if (remote && (remote == dev_of_node(dev))) { + of_node_put(remote); + of_node_put(endpoint); + return PWRSEQ_MATCH_OK; + } + of_node_put(remote); + } + + return PWRSEQ_NO_MATCH; +} + +static int pwrseq_pcie_m2_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct pwrseq_pcie_m2_ctx *ctx; + struct pwrseq_config config = {}; + int ret; + + ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + ctx->of_node = dev_of_node(dev); + ctx->pdata = device_get_match_data(dev); + if (!ctx->pdata) + return dev_err_probe(dev, -ENODEV, + "Failed to obtain platform data\n"); + + /* + * Currently, of_regulator_bulk_get_all() is the only regulator API that + * allows to get all supplies in the devicetree node without manually + * specifying them. + */ + ret = of_regulator_bulk_get_all(dev, dev_of_node(dev), &ctx->regs); + if (ret < 0) + return dev_err_probe(dev, ret, + "Failed to get all regulators\n"); + + ctx->num_vregs = ret; + + config.parent = dev; + config.owner = THIS_MODULE; + config.drvdata = ctx; + config.match = pwrseq_pcie_m2_match; + config.targets = ctx->pdata->targets; + + ctx->pwrseq = devm_pwrseq_device_register(dev, &config); + if (IS_ERR(ctx->pwrseq)) { + regulator_bulk_free(ctx->num_vregs, ctx->regs); + return dev_err_probe(dev, PTR_ERR(ctx->pwrseq), + "Failed to register the power sequencer\n"); + } + + return 0; +} + +static const struct of_device_id pwrseq_pcie_m2_of_match[] = { + { + .compatible = "pcie-m2-m-connector", + .data = &pwrseq_pcie_m2_m_of_data, + }, + { } +}; +MODULE_DEVICE_TABLE(of, pwrseq_pcie_m2_of_match); + +static struct platform_driver pwrseq_pcie_m2_driver = { + .driver = { + .name = "pwrseq-pcie-m2", + .of_match_table = pwrseq_pcie_m2_of_match, + }, + .probe = pwrseq_pcie_m2_probe, +}; +module_platform_driver(pwrseq_pcie_m2_driver); + +MODULE_AUTHOR("Manivannan Sadhasivam "); +MODULE_DESCRIPTION("Power Sequencing driver for PCIe M.2 connector"); +MODULE_LICENSE("GPL"); -- 2.48.1