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e66d1cb3c2
Changing voltage and enabling regulator might require delays so the regulator stabilizes at expected level. Add support for "regulator-ramp-delay" binding which can introduce required time to both enabling the regulator and to changing the voltage. Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Tested-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
430 lines
9.9 KiB
C
430 lines
9.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2014-2015 Samsung Electronics
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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 <dm/uclass-internal.h>
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#include <power/pmic.h>
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#include <power/regulator.h>
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int regulator_mode(struct udevice *dev, struct dm_regulator_mode **modep)
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{
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struct dm_regulator_uclass_platdata *uc_pdata;
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*modep = NULL;
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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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*modep = uc_pdata->mode;
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return uc_pdata->mode_count;
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}
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int regulator_get_value(struct udevice *dev)
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{
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const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
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if (!ops || !ops->get_value)
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return -ENOSYS;
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return ops->get_value(dev);
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}
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static void regulator_set_value_ramp_delay(struct udevice *dev, int old_uV,
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int new_uV, unsigned int ramp_delay)
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{
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int delay = DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay);
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debug("regulator %s: delay %u us (%d uV -> %d uV)\n", dev->name, delay,
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old_uV, new_uV);
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udelay(delay);
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}
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int regulator_set_value(struct udevice *dev, int uV)
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{
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const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
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struct dm_regulator_uclass_platdata *uc_pdata;
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int ret, old_uV = uV, is_enabled = 0;
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uc_pdata = dev_get_uclass_platdata(dev);
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if (uc_pdata->min_uV != -ENODATA && uV < uc_pdata->min_uV)
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return -EINVAL;
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if (uc_pdata->max_uV != -ENODATA && uV > uc_pdata->max_uV)
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return -EINVAL;
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if (!ops || !ops->set_value)
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return -ENOSYS;
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if (uc_pdata->ramp_delay) {
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is_enabled = regulator_get_enable(dev);
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old_uV = regulator_get_value(dev);
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}
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ret = ops->set_value(dev, uV);
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if (!ret) {
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if (uc_pdata->ramp_delay && old_uV > 0 && is_enabled)
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regulator_set_value_ramp_delay(dev, old_uV, uV,
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uc_pdata->ramp_delay);
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}
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return ret;
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}
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/*
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* To be called with at most caution as there is no check
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* before setting the actual voltage value.
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*/
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int regulator_set_value_force(struct udevice *dev, int uV)
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{
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const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
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if (!ops || !ops->set_value)
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return -ENOSYS;
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return ops->set_value(dev, uV);
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}
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int regulator_get_current(struct udevice *dev)
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{
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const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
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if (!ops || !ops->get_current)
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return -ENOSYS;
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return ops->get_current(dev);
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}
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int regulator_set_current(struct udevice *dev, int uA)
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{
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const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
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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->min_uA != -ENODATA && uA < uc_pdata->min_uA)
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return -EINVAL;
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if (uc_pdata->max_uA != -ENODATA && uA > uc_pdata->max_uA)
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return -EINVAL;
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if (!ops || !ops->set_current)
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return -ENOSYS;
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return ops->set_current(dev, uA);
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}
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int regulator_get_enable(struct udevice *dev)
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{
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const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
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if (!ops || !ops->get_enable)
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return -ENOSYS;
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return ops->get_enable(dev);
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}
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int regulator_set_enable(struct udevice *dev, bool enable)
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{
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const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
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struct dm_regulator_uclass_platdata *uc_pdata;
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int ret, old_enable = 0;
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if (!ops || !ops->set_enable)
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return -ENOSYS;
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uc_pdata = dev_get_uclass_platdata(dev);
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if (!enable && uc_pdata->always_on)
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return -EACCES;
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if (uc_pdata->ramp_delay)
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old_enable = regulator_get_enable(dev);
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ret = ops->set_enable(dev, enable);
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if (!ret) {
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if (uc_pdata->ramp_delay && !old_enable && enable) {
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int uV = regulator_get_value(dev);
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if (uV > 0) {
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regulator_set_value_ramp_delay(dev, 0, uV,
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uc_pdata->ramp_delay);
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}
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}
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}
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return ret;
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}
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int regulator_set_enable_if_allowed(struct udevice *dev, bool enable)
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{
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int ret;
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ret = regulator_set_enable(dev, enable);
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if (ret == -ENOSYS || ret == -EACCES)
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return 0;
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return ret;
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}
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int regulator_get_mode(struct udevice *dev)
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{
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const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
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if (!ops || !ops->get_mode)
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return -ENOSYS;
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return ops->get_mode(dev);
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}
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int regulator_set_mode(struct udevice *dev, int mode)
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{
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const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
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if (!ops || !ops->set_mode)
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return -ENOSYS;
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return ops->set_mode(dev, mode);
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}
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int regulator_get_by_platname(const char *plat_name, struct udevice **devp)
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{
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struct dm_regulator_uclass_platdata *uc_pdata;
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struct udevice *dev;
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int ret;
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*devp = NULL;
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for (ret = uclass_find_first_device(UCLASS_REGULATOR, &dev); dev;
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ret = uclass_find_next_device(&dev)) {
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if (ret) {
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debug("regulator %s, ret=%d\n", dev->name, ret);
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continue;
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}
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uc_pdata = dev_get_uclass_platdata(dev);
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if (!uc_pdata || strcmp(plat_name, uc_pdata->name))
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continue;
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return uclass_get_device_tail(dev, 0, devp);
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}
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debug("%s: can't find: %s, ret=%d\n", __func__, plat_name, ret);
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return -ENODEV;
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}
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int regulator_get_by_devname(const char *devname, struct udevice **devp)
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{
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return uclass_get_device_by_name(UCLASS_REGULATOR, devname, devp);
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}
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int device_get_supply_regulator(struct udevice *dev, const char *supply_name,
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struct udevice **devp)
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{
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return uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
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supply_name, devp);
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}
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int regulator_autoset(struct udevice *dev)
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{
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struct dm_regulator_uclass_platdata *uc_pdata;
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int ret = 0;
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uc_pdata = dev_get_uclass_platdata(dev);
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if (!uc_pdata->always_on && !uc_pdata->boot_on)
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return -EMEDIUMTYPE;
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if (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UV)
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ret = regulator_set_value(dev, uc_pdata->min_uV);
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if (!ret && (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UA))
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ret = regulator_set_current(dev, uc_pdata->min_uA);
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if (!ret)
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ret = regulator_set_enable(dev, true);
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return ret;
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}
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static void regulator_show(struct udevice *dev, int ret)
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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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printf("%s@%s: ", dev->name, uc_pdata->name);
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if (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UV)
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printf("set %d uV", uc_pdata->min_uV);
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if (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UA)
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printf("; set %d uA", uc_pdata->min_uA);
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printf("; enabling");
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if (ret)
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printf(" (ret: %d)", ret);
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printf("\n");
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}
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int regulator_autoset_by_name(const char *platname, struct udevice **devp)
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{
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struct udevice *dev;
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int ret;
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ret = regulator_get_by_platname(platname, &dev);
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if (devp)
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*devp = dev;
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if (ret) {
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debug("Can get the regulator: %s (err=%d)\n", platname, ret);
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return ret;
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}
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return regulator_autoset(dev);
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}
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int regulator_list_autoset(const char *list_platname[],
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struct udevice *list_devp[],
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bool verbose)
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{
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struct udevice *dev;
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int error = 0, i = 0, ret;
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while (list_platname[i]) {
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ret = regulator_autoset_by_name(list_platname[i], &dev);
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if (ret != -EMEDIUMTYPE && verbose)
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regulator_show(dev, ret);
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if (ret & !error)
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error = ret;
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if (list_devp)
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list_devp[i] = dev;
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i++;
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}
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return error;
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}
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static bool regulator_name_is_unique(struct udevice *check_dev,
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const char *check_name)
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{
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struct dm_regulator_uclass_platdata *uc_pdata;
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struct udevice *dev;
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int check_len = strlen(check_name);
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int ret;
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int len;
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for (ret = uclass_find_first_device(UCLASS_REGULATOR, &dev); dev;
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ret = uclass_find_next_device(&dev)) {
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if (ret || dev == check_dev)
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continue;
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uc_pdata = dev_get_uclass_platdata(dev);
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len = strlen(uc_pdata->name);
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if (len != check_len)
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continue;
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if (!strcmp(uc_pdata->name, check_name))
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return false;
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}
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return true;
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}
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static int regulator_post_bind(struct udevice *dev)
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{
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struct dm_regulator_uclass_platdata *uc_pdata;
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const char *property = "regulator-name";
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uc_pdata = dev_get_uclass_platdata(dev);
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/* Regulator's mandatory constraint */
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uc_pdata->name = dev_read_string(dev, property);
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if (!uc_pdata->name) {
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debug("%s: dev '%s' has no property '%s'\n",
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__func__, dev->name, property);
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uc_pdata->name = dev_read_name(dev);
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if (!uc_pdata->name)
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return -EINVAL;
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}
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if (regulator_name_is_unique(dev, uc_pdata->name))
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return 0;
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debug("'%s' of dev: '%s', has nonunique value: '%s\n",
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property, dev->name, uc_pdata->name);
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return -EINVAL;
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}
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static int regulator_pre_probe(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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/* Regulator's optional constraints */
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uc_pdata->min_uV = dev_read_u32_default(dev, "regulator-min-microvolt",
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-ENODATA);
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uc_pdata->max_uV = dev_read_u32_default(dev, "regulator-max-microvolt",
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-ENODATA);
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uc_pdata->min_uA = dev_read_u32_default(dev, "regulator-min-microamp",
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-ENODATA);
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uc_pdata->max_uA = dev_read_u32_default(dev, "regulator-max-microamp",
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-ENODATA);
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uc_pdata->always_on = dev_read_bool(dev, "regulator-always-on");
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uc_pdata->boot_on = dev_read_bool(dev, "regulator-boot-on");
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uc_pdata->ramp_delay = dev_read_u32_default(dev, "regulator-ramp-delay",
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0);
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/* Those values are optional (-ENODATA if unset) */
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if ((uc_pdata->min_uV != -ENODATA) &&
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(uc_pdata->max_uV != -ENODATA) &&
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(uc_pdata->min_uV == uc_pdata->max_uV))
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uc_pdata->flags |= REGULATOR_FLAG_AUTOSET_UV;
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/* Those values are optional (-ENODATA if unset) */
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if ((uc_pdata->min_uA != -ENODATA) &&
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(uc_pdata->max_uA != -ENODATA) &&
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(uc_pdata->min_uA == uc_pdata->max_uA))
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uc_pdata->flags |= REGULATOR_FLAG_AUTOSET_UA;
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return 0;
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}
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int regulators_enable_boot_on(bool verbose)
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{
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struct udevice *dev;
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struct uclass *uc;
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int ret;
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ret = uclass_get(UCLASS_REGULATOR, &uc);
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if (ret)
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return ret;
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for (uclass_first_device(UCLASS_REGULATOR, &dev);
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dev;
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uclass_next_device(&dev)) {
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ret = regulator_autoset(dev);
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if (ret == -EMEDIUMTYPE) {
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ret = 0;
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continue;
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}
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if (verbose)
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regulator_show(dev, ret);
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if (ret == -ENOSYS)
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ret = 0;
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}
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return ret;
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}
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UCLASS_DRIVER(regulator) = {
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.id = UCLASS_REGULATOR,
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.name = "regulator",
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.post_bind = regulator_post_bind,
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.pre_probe = regulator_pre_probe,
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.per_device_platdata_auto_alloc_size =
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sizeof(struct dm_regulator_uclass_platdata),
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};
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