1 files changed, 93 insertions, 0 deletions
diff --git a/drivers/pci/pwrctrl/slot.c b/drivers/pci/pwrctrl/slot.c
new file mode 100644
index 000000000000..18becc144913
--- /dev/null
+++ b/drivers/pci/pwrctrl/slot.c
@@ -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");