1 files changed, 102 insertions, 0 deletions
diff --git a/drivers/regulator/vexpress-regulator.c b/drivers/regulator/vexpress-regulator.c
new file mode 100644
index 0000000000..6687077e9a
--- /dev/null
+++ b/drivers/regulator/vexpress-regulator.c
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (C) 2012 ARM Limited
+
+#define DRVNAME "vexpress-regulator"
+#define pr_fmt(fmt) DRVNAME ": " fmt
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/vexpress.h>
+
+static int vexpress_regulator_get_voltage(struct regulator_dev *regdev)
+{
+	unsigned int uV;
+	int err = regmap_read(regdev->regmap, 0, &uV);
+
+	return err ? err : uV;
+}
+
+static int vexpress_regulator_set_voltage(struct regulator_dev *regdev,
+		int min_uV, int max_uV, unsigned *selector)
+{
+	return regmap_write(regdev->regmap, 0, min_uV);
+}
+
+static const struct regulator_ops vexpress_regulator_ops_ro = {
+	.get_voltage = vexpress_regulator_get_voltage,
+};
+
+static const struct regulator_ops vexpress_regulator_ops = {
+	.get_voltage = vexpress_regulator_get_voltage,
+	.set_voltage = vexpress_regulator_set_voltage,
+};
+
+static int vexpress_regulator_probe(struct platform_device *pdev)
+{
+	struct regulator_desc *desc;
+	struct regulator_init_data *init_data;
+	struct regulator_config config = { };
+	struct regulator_dev *rdev;
+	struct regmap *regmap;
+
+	desc = devm_kzalloc(&pdev->dev, sizeof(*desc), GFP_KERNEL);
+	if (!desc)
+		return -ENOMEM;
+
+	regmap = devm_regmap_init_vexpress_config(&pdev->dev);
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	desc->name = dev_name(&pdev->dev);
+	desc->type = REGULATOR_VOLTAGE;
+	desc->owner = THIS_MODULE;
+	desc->continuous_voltage_range = true;
+
+	init_data = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node,
+					       desc);
+	if (!init_data)
+		return -EINVAL;
+
+	init_data->constraints.apply_uV = 0;
+	if (init_data->constraints.min_uV && init_data->constraints.max_uV)
+		desc->ops = &vexpress_regulator_ops;
+	else
+		desc->ops = &vexpress_regulator_ops_ro;
+
+	config.regmap = regmap;
+	config.dev = &pdev->dev;
+	config.init_data = init_data;
+	config.of_node = pdev->dev.of_node;
+
+	rdev = devm_regulator_register(&pdev->dev, desc, &config);
+	return PTR_ERR_OR_ZERO(rdev);
+}
+
+static const struct of_device_id vexpress_regulator_of_match[] = {
+	{ .compatible = "arm,vexpress-volt", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, vexpress_regulator_of_match);
+
+static struct platform_driver vexpress_regulator_driver = {
+	.probe = vexpress_regulator_probe,
+	.driver	= {
+		.name = DRVNAME,
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+		.of_match_table = vexpress_regulator_of_match,
+	},
+};
+
+module_platform_driver(vexpress_regulator_driver);
+
+MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
+MODULE_DESCRIPTION("Versatile Express regulator");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:vexpress-regulator");