155 lines
3.7 KiB
C
155 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2015 Samsung Electronics
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*
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* Przemyslaw Marczak <p.marczak@samsung.com>
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*/
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#include <common.h>
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#include <errno.h>
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#include <dm.h>
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#include <i2c.h>
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#include <asm/gpio.h>
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#include <power/pmic.h>
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#include <power/regulator.h>
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struct fixed_regulator_platdata {
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struct gpio_desc gpio; /* GPIO for regulator enable control */
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unsigned int startup_delay_us;
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unsigned int off_on_delay_us;
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};
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static int fixed_regulator_ofdata_to_platdata(struct udevice *dev)
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{
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struct dm_regulator_uclass_platdata *uc_pdata;
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struct fixed_regulator_platdata *dev_pdata;
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struct gpio_desc *gpio;
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int flags = GPIOD_IS_OUT;
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int ret;
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dev_pdata = dev_get_platdata(dev);
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uc_pdata = dev_get_uclass_platdata(dev);
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if (!uc_pdata)
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return -ENXIO;
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/* Set type to fixed */
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uc_pdata->type = REGULATOR_TYPE_FIXED;
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if (dev_read_bool(dev, "enable-active-high"))
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flags |= GPIOD_IS_OUT_ACTIVE;
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/* Get fixed regulator optional enable GPIO desc */
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gpio = &dev_pdata->gpio;
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ret = gpio_request_by_name(dev, "gpio", 0, gpio, flags);
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if (ret) {
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debug("Fixed regulator optional enable GPIO - not found! Error: %d\n",
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ret);
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if (ret != -ENOENT)
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return ret;
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}
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/* Get optional ramp up delay */
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dev_pdata->startup_delay_us = dev_read_u32_default(dev,
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"startup-delay-us", 0);
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dev_pdata->off_on_delay_us =
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dev_read_u32_default(dev, "u-boot,off-on-delay-us", 0);
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return 0;
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}
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static int fixed_regulator_get_value(struct udevice *dev)
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{
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struct dm_regulator_uclass_platdata *uc_pdata;
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uc_pdata = dev_get_uclass_platdata(dev);
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if (!uc_pdata)
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return -ENXIO;
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if (uc_pdata->min_uV != uc_pdata->max_uV) {
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debug("Invalid constraints for: %s\n", uc_pdata->name);
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return -EINVAL;
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}
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return uc_pdata->min_uV;
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}
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static int fixed_regulator_get_current(struct udevice *dev)
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{
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struct dm_regulator_uclass_platdata *uc_pdata;
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uc_pdata = dev_get_uclass_platdata(dev);
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if (!uc_pdata)
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return -ENXIO;
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if (uc_pdata->min_uA != uc_pdata->max_uA) {
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debug("Invalid constraints for: %s\n", uc_pdata->name);
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return -EINVAL;
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}
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return uc_pdata->min_uA;
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}
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static int fixed_regulator_get_enable(struct udevice *dev)
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{
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struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
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/* Enable GPIO is optional */
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if (!dev_pdata->gpio.dev)
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return true;
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return dm_gpio_get_value(&dev_pdata->gpio);
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}
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static int fixed_regulator_set_enable(struct udevice *dev, bool enable)
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{
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struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
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int ret;
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debug("%s: dev='%s', enable=%d, delay=%d, has_gpio=%d\n", __func__,
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dev->name, enable, dev_pdata->startup_delay_us,
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dm_gpio_is_valid(&dev_pdata->gpio));
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/* Enable GPIO is optional */
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if (!dm_gpio_is_valid(&dev_pdata->gpio)) {
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if (!enable)
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return -ENOSYS;
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return 0;
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}
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ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
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if (ret) {
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pr_err("Can't set regulator : %s gpio to: %d\n", dev->name,
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enable);
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return ret;
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}
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if (enable && dev_pdata->startup_delay_us)
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udelay(dev_pdata->startup_delay_us);
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debug("%s: done\n", __func__);
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if (!enable && dev_pdata->off_on_delay_us)
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udelay(dev_pdata->off_on_delay_us);
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return 0;
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}
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static const struct dm_regulator_ops fixed_regulator_ops = {
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.get_value = fixed_regulator_get_value,
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.get_current = fixed_regulator_get_current,
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.get_enable = fixed_regulator_get_enable,
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.set_enable = fixed_regulator_set_enable,
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};
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static const struct udevice_id fixed_regulator_ids[] = {
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{ .compatible = "regulator-fixed" },
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{ },
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};
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U_BOOT_DRIVER(fixed_regulator) = {
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.name = "fixed regulator",
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.id = UCLASS_REGULATOR,
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.ops = &fixed_regulator_ops,
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.of_match = fixed_regulator_ids,
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.ofdata_to_platdata = fixed_regulator_ofdata_to_platdata,
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.platdata_auto_alloc_size = sizeof(struct fixed_regulator_platdata),
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};
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