Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / regulator / vexpress.c

diff --git a/kernel/drivers/regulator/vexpress.c b/kernel/drivers/regulator/vexpress.c
new file mode 100644 (file)
index 0000000..bed9d3e
--- /dev/null
+++ b/kernel/drivers/regulator/vexpress.c
@@ -0,0 +1,120 @@
+/*
+ * 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 regmap *regmap;
+};
+
+static int vexpress_regulator_get_voltage(struct regulator_dev *regdev)
+{
+       struct vexpress_regulator *reg = rdev_get_drvdata(regdev);
+       u32 uV;
+       int err = regmap_read(reg->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)
+{
+       struct vexpress_regulator *reg = rdev_get_drvdata(regdev);
+
+       return regmap_write(reg->regmap, 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)
+{
+       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)
+               return -ENOMEM;
+
+       reg->regmap = devm_regmap_init_vexpress_config(&pdev->dev);
+       if (IS_ERR(reg->regmap))
+               return PTR_ERR(reg->regmap);
+
+       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,
+                                              &reg->desc);
+       if (!init_data)
+               return -EINVAL;
+
+       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 = devm_regulator_register(&pdev->dev, &reg->desc, &config);
+       if (IS_ERR(reg->regdev))
+               return PTR_ERR(reg->regdev);
+
+       platform_set_drvdata(pdev, reg);
+
+       return 0;
+}
+
+static const struct of_device_id vexpress_regulator_of_match[] = {
+       { .compatible = "arm,vexpress-volt", },
+       { }
+};
+
+static struct platform_driver vexpress_regulator_driver = {
+       .probe = vexpress_regulator_probe,
+       .driver = {
+               .name = DRVNAME,
+               .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");