regulator: Versatile Express regulator driver
Implementation of the regulator framework driver for the
Versatile Express voltage control. Devices without
voltage constraints (ie. "regulator-[min|max]-microvolt"
properties in the DT node) are treated as fixed (or rather
read-only) regulators.
Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/drivers/regulator/vexpress.c b/drivers/regulator/vexpress.c
new file mode 100644
index 0000000..1702945a
--- /dev/null
+++ b/drivers/regulator/vexpress.c
@@ -0,0 +1,146 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * 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/of_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/vexpress.h>
+
+struct vexpress_regulator {
+ struct regulator_desc desc;
+ struct regulator_dev *regdev;
+ struct vexpress_config_func *func;
+};
+
+static int vexpress_regulator_get_voltage(struct regulator_dev *regdev)
+{
+ struct vexpress_regulator *reg = rdev_get_drvdata(regdev);
+ u32 uV;
+ int err = vexpress_config_read(reg->func, 0, &uV);
+
+ return err ? err : uV;
+}
+
+static int vexpress_regulator_set_voltage(struct regulator_dev *regdev,
+ int min_uV, int max_uV, unsigned *selector)
+{
+ struct vexpress_regulator *reg = rdev_get_drvdata(regdev);
+
+ return vexpress_config_write(reg->func, 0, min_uV);
+}
+
+static struct regulator_ops vexpress_regulator_ops_ro = {
+ .get_voltage = vexpress_regulator_get_voltage,
+};
+
+static 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)
+{
+ int err;
+ struct vexpress_regulator *reg;
+ struct regulator_init_data *init_data;
+ struct regulator_config config = { };
+
+ reg = devm_kzalloc(&pdev->dev, sizeof(*reg), GFP_KERNEL);
+ if (!reg) {
+ err = -ENOMEM;
+ goto error_kzalloc;
+ }
+
+ reg->func = vexpress_config_func_get_by_dev(&pdev->dev);
+ if (!reg->func) {
+ err = -ENXIO;
+ goto error_get_func;
+ }
+
+ reg->desc.name = dev_name(&pdev->dev);
+ reg->desc.type = REGULATOR_VOLTAGE;
+ reg->desc.owner = THIS_MODULE;
+ reg->desc.continuous_voltage_range = true;
+
+ init_data = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node);
+ if (!init_data) {
+ err = -EINVAL;
+ goto error_get_regulator_init_data;
+ }
+
+ init_data->constraints.apply_uV = 0;
+ if (init_data->constraints.min_uV && init_data->constraints.max_uV)
+ reg->desc.ops = &vexpress_regulator_ops;
+ else
+ reg->desc.ops = &vexpress_regulator_ops_ro;
+
+ config.dev = &pdev->dev;
+ config.init_data = init_data;
+ config.driver_data = reg;
+ config.of_node = pdev->dev.of_node;
+
+ reg->regdev = regulator_register(®->desc, &config);
+ if (IS_ERR(reg->regdev)) {
+ err = PTR_ERR(reg->regdev);
+ goto error_regulator_register;
+ }
+
+ platform_set_drvdata(pdev, reg);
+
+ return 0;
+
+error_regulator_register:
+error_get_regulator_init_data:
+ vexpress_config_func_put(reg->func);
+error_get_func:
+error_kzalloc:
+ return err;
+}
+
+static int __devexit vexpress_regulator_remove(struct platform_device *pdev)
+{
+ struct vexpress_regulator *reg = platform_get_drvdata(pdev);
+
+ vexpress_config_func_put(reg->func);
+ regulator_unregister(reg->regdev);
+
+ return 0;
+}
+
+static struct of_device_id vexpress_regulator_of_match[] = {
+ { .compatible = "arm,vexpress-volt", },
+};
+
+static struct platform_driver vexpress_regulator_driver = {
+ .probe = vexpress_regulator_probe,
+ .remove = __devexit_p(vexpress_regulator_remove),
+ .driver = {
+ .name = DRVNAME,
+ .owner = THIS_MODULE,
+ .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");