dm: regulator: add fixed voltage regulator driver
This driver implements regulator operations for fixed Voltage/Current
value regulators. beside the standard regulator constraints, which are
put into the uclass platform data, a typical fixed regulator node provides
few additional properties like:
- gpio
- gpio-open-drain
- enable-active-high
- startup-delay-us
The only 'gpio' is used by this driver and is kept in structure of type
'fixed_regulator_platdata', as a device platform data (dev->platdata).
The driver implements:
- get_value
- get_current
- get_enable
- set_enable
The regulator calls and commands can be used for fixed-regulator devices,
and the proper error will be returned for prohibited.
Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/power/regulator/fixed.c b/drivers/power/regulator/fixed.c
new file mode 100644
index 0000000..d053817
--- /dev/null
+++ b/drivers/power/regulator/fixed.c
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2015 Samsung Electronics
+ *
+ * Przemyslaw Marczak <p.marczak@samsung.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <fdtdec.h>
+#include <errno.h>
+#include <dm.h>
+#include <i2c.h>
+#include <asm/gpio.h>
+#include <power/pmic.h>
+#include <power/regulator.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct fixed_regulator_platdata {
+ struct gpio_desc gpio; /* GPIO for regulator enable control */
+};
+
+static int fixed_regulator_ofdata_to_platdata(struct udevice *dev)
+{
+ struct dm_regulator_uclass_platdata *uc_pdata;
+ struct fixed_regulator_platdata *dev_pdata;
+ struct gpio_desc *gpio;
+ int ret;
+
+ dev_pdata = dev_get_platdata(dev);
+ uc_pdata = dev_get_uclass_platdata(dev);
+ if (!uc_pdata)
+ return -ENXIO;
+
+ /* Set type to fixed */
+ uc_pdata->type = REGULATOR_TYPE_FIXED;
+
+ /* Get fixed regulator gpio desc */
+ gpio = &dev_pdata->gpio;
+ ret = gpio_request_by_name(dev, "gpio", 0, gpio, GPIOD_IS_OUT);
+ if (ret)
+ debug("Fixed regulator gpio - not found! Error: %d", ret);
+
+ return 0;
+}
+
+static int fixed_regulator_get_value(struct udevice *dev)
+{
+ struct dm_regulator_uclass_platdata *uc_pdata;
+
+ uc_pdata = dev_get_uclass_platdata(dev);
+ if (!uc_pdata)
+ return -ENXIO;
+
+ if (uc_pdata->min_uV != uc_pdata->max_uV) {
+ debug("Invalid constraints for: %s\n", uc_pdata->name);
+ return -EINVAL;
+ }
+
+ return uc_pdata->min_uV;
+}
+
+static int fixed_regulator_get_current(struct udevice *dev)
+{
+ struct dm_regulator_uclass_platdata *uc_pdata;
+
+ uc_pdata = dev_get_uclass_platdata(dev);
+ if (!uc_pdata)
+ return -ENXIO;
+
+ if (uc_pdata->min_uA != uc_pdata->max_uA) {
+ debug("Invalid constraints for: %s\n", uc_pdata->name);
+ return -EINVAL;
+ }
+
+ return uc_pdata->min_uA;
+}
+
+static bool fixed_regulator_get_enable(struct udevice *dev)
+{
+ struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
+
+ if (!dev_pdata->gpio.dev)
+ return false;
+
+ return dm_gpio_get_value(&dev_pdata->gpio);
+}
+
+static int fixed_regulator_set_enable(struct udevice *dev, bool enable)
+{
+ struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
+ int ret;
+
+ if (!dev_pdata->gpio.dev)
+ return -ENOSYS;
+
+ ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
+ if (ret) {
+ error("Can't set regulator : %s gpio to: %d\n", dev->name,
+ enable);
+ return ret;
+ }
+ return 0;
+}
+
+static const struct dm_regulator_ops fixed_regulator_ops = {
+ .get_value = fixed_regulator_get_value,
+ .get_current = fixed_regulator_get_current,
+ .get_enable = fixed_regulator_get_enable,
+ .set_enable = fixed_regulator_set_enable,
+};
+
+static const struct udevice_id fixed_regulator_ids[] = {
+ { .compatible = "regulator-fixed" },
+ { },
+};
+
+U_BOOT_DRIVER(fixed_regulator) = {
+ .name = "fixed regulator",
+ .id = UCLASS_REGULATOR,
+ .ops = &fixed_regulator_ops,
+ .of_match = fixed_regulator_ids,
+ .ofdata_to_platdata = fixed_regulator_ofdata_to_platdata,
+ .platdata_auto_alloc_size = sizeof(struct fixed_regulator_platdata),
+};