134 lines
3.5 KiB
C
134 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2020 ROHM Semiconductors
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#include <linux/errno.h>
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#include <linux/mfd/rohm-generic.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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#include <linux/regulator/driver.h>
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static int set_dvs_level(const struct regulator_desc *desc,
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struct device_node *np, struct regmap *regmap,
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char *prop, unsigned int reg, unsigned int mask,
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unsigned int omask, unsigned int oreg)
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{
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int ret, i;
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uint32_t uv;
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ret = of_property_read_u32(np, prop, &uv);
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if (ret) {
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if (ret != -EINVAL)
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return ret;
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return 0;
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}
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/* If voltage is set to 0 => disable */
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if (uv == 0) {
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if (omask)
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return regmap_update_bits(regmap, oreg, omask, 0);
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}
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/* Some setups don't allow setting own voltage but do allow enabling */
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if (!mask) {
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if (omask)
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return regmap_update_bits(regmap, oreg, omask, omask);
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return -EINVAL;
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}
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for (i = 0; i < desc->n_voltages; i++) {
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/* NOTE to next hacker - Does not support pickable ranges */
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if (desc->linear_range_selectors)
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return -EINVAL;
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if (desc->n_linear_ranges)
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ret = regulator_desc_list_voltage_linear_range(desc, i);
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else
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ret = regulator_desc_list_voltage_linear(desc, i);
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if (ret < 0)
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continue;
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if (ret == uv) {
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i <<= ffs(desc->vsel_mask) - 1;
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ret = regmap_update_bits(regmap, reg, mask, i);
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if (omask && !ret)
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ret = regmap_update_bits(regmap, oreg, omask,
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omask);
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break;
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}
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}
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return ret;
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}
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int rohm_regulator_set_dvs_levels(const struct rohm_dvs_config *dvs,
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struct device_node *np,
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const struct regulator_desc *desc,
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struct regmap *regmap)
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{
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int i, ret = 0;
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char *prop;
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unsigned int reg, mask, omask, oreg = desc->enable_reg;
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for (i = 0; i < ROHM_DVS_LEVEL_VALID_AMOUNT && !ret; i++) {
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int bit;
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bit = BIT(i);
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if (dvs->level_map & bit) {
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switch (bit) {
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case ROHM_DVS_LEVEL_RUN:
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prop = "rohm,dvs-run-voltage";
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reg = dvs->run_reg;
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mask = dvs->run_mask;
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omask = dvs->run_on_mask;
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break;
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case ROHM_DVS_LEVEL_IDLE:
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prop = "rohm,dvs-idle-voltage";
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reg = dvs->idle_reg;
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mask = dvs->idle_mask;
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omask = dvs->idle_on_mask;
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break;
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case ROHM_DVS_LEVEL_SUSPEND:
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prop = "rohm,dvs-suspend-voltage";
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reg = dvs->suspend_reg;
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mask = dvs->suspend_mask;
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omask = dvs->suspend_on_mask;
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break;
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case ROHM_DVS_LEVEL_LPSR:
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prop = "rohm,dvs-lpsr-voltage";
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reg = dvs->lpsr_reg;
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mask = dvs->lpsr_mask;
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omask = dvs->lpsr_on_mask;
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break;
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case ROHM_DVS_LEVEL_SNVS:
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prop = "rohm,dvs-snvs-voltage";
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reg = dvs->snvs_reg;
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mask = dvs->snvs_mask;
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omask = dvs->snvs_on_mask;
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break;
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default:
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return -EINVAL;
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}
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ret = set_dvs_level(desc, np, regmap, prop, reg, mask,
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omask, oreg);
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}
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}
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return ret;
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}
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EXPORT_SYMBOL(rohm_regulator_set_dvs_levels);
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/*
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* Few ROHM PMIC ICs have constrains on voltage changing:
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* BD71837 - only buck 1-4 voltages can be changed when they are enabled.
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* Other bucks and all LDOs must be disabled when voltage is changed.
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* BD96801 - LDO voltage levels can be changed when LDOs are disabled.
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*/
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int rohm_regulator_set_voltage_sel_restricted(struct regulator_dev *rdev,
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unsigned int sel)
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{
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if (rdev->desc->ops->is_enabled(rdev))
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return -EBUSY;
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return regulator_set_voltage_sel_regmap(rdev, sel);
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}
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EXPORT_SYMBOL_GPL(rohm_regulator_set_voltage_sel_restricted);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
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MODULE_DESCRIPTION("Generic helpers for ROHM PMIC regulator drivers");
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