@@ -10,3 +10,14 @@ config PCI_PWRCTL_PWRSEQ
tristate
select POWER_SEQUENCING
select PCI_PWRCTL
+
+config PCI_PWRCTL_SLOT
+ tristate "PCI Power Control driver for PCI slots"
+ select PCI_PWRCTL
+ help
+ Say Y here to enable the PCI Power Control driver to control the power
+ state of PCI slots.
+
+ This is a generic driver that controls the power state of different
+ PCI slots. The voltage regulators powering the rails of the PCI slots
+ are expected to be defined in the devicetree node of the PCI bridge.
@@ -4,3 +4,6 @@ obj-$(CONFIG_PCI_PWRCTL) += pci-pwrctrl-core.o
pci-pwrctrl-core-y := core.o
obj-$(CONFIG_PCI_PWRCTL_PWRSEQ) += pci-pwrctrl-pwrseq.o
+
+obj-$(CONFIG_PCI_PWRCTL_SLOT) += pci-pwrctl-slot.o
+pci-pwrctl-slot-y := slot.o
new file mode 100644
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2024 Linaro Ltd.
+ * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+ */
+
+#include <linux/device.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/pci-pwrctrl.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+
+struct pci_pwrctrl_slot_data {
+ struct pci_pwrctrl ctx;
+ struct regulator_bulk_data *supplies;
+ int num_supplies;
+};
+
+static void devm_pci_pwrctrl_slot_power_off(void *data)
+{
+ struct pci_pwrctrl_slot_data *slot = data;
+
+ regulator_bulk_disable(slot->num_supplies, slot->supplies);
+ regulator_bulk_free(slot->num_supplies, slot->supplies);
+}
+
+static int pci_pwrctrl_slot_probe(struct platform_device *pdev)
+{
+ struct pci_pwrctrl_slot_data *slot;
+ struct device *dev = &pdev->dev;
+ int ret;
+
+ slot = devm_kzalloc(dev, sizeof(*slot), GFP_KERNEL);
+ if (!slot)
+ return -ENOMEM;
+
+ ret = of_regulator_bulk_get_all(dev, dev_of_node(dev),
+ &slot->supplies);
+ if (ret < 0) {
+ dev_err_probe(dev, ret, "Failed to get slot regulators\n");
+ return ret;
+ }
+
+ slot->num_supplies = ret;
+ ret = regulator_bulk_enable(slot->num_supplies, slot->supplies);
+ if (ret < 0) {
+ dev_err_probe(dev, ret, "Failed to enable slot regulators\n");
+ goto err_regulator_free;
+ }
+
+ ret = devm_add_action_or_reset(dev, devm_pci_pwrctrl_slot_power_off,
+ slot);
+ if (ret)
+ goto err_regulator_disable;
+
+ pci_pwrctrl_init(&slot->ctx, dev);
+
+ ret = devm_pci_pwrctrl_device_set_ready(dev, &slot->ctx);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to register pwrctrl driver\n");
+
+ return 0;
+
+err_regulator_disable:
+ regulator_bulk_disable(slot->num_supplies, slot->supplies);
+err_regulator_free:
+ regulator_bulk_free(slot->num_supplies, slot->supplies);
+
+ return ret;
+}
+
+static const struct of_device_id pci_pwrctrl_slot_of_match[] = {
+ {
+ .compatible = "pciclass,0604",
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(of, pci_pwrctrl_slot_of_match);
+
+static struct platform_driver pci_pwrctrl_slot_driver = {
+ .driver = {
+ .name = "pci-pwrctrl-slot",
+ .of_match_table = pci_pwrctrl_slot_of_match,
+ },
+ .probe = pci_pwrctrl_slot_probe,
+};
+module_platform_driver(pci_pwrctrl_slot_driver);
+
+MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
+MODULE_DESCRIPTION("Generic PCI Power Control driver for PCI Slots");
+MODULE_LICENSE("GPL");