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Right now the regulator helpers expect raw register values for the range selectors. This is different from the voltage selectors, which are normalized as bitfield values. This leads to a bit of confusion. Also, raw values are harder to copy from datasheets or match up with them, as datasheets will typically have bitfield values. Make the helpers expect bitfield values, and convert existing users. The field in regulator_desc is renamed to |linear_range_selectors_bitfield|. This is intended to cause drivers added in the same merge window and out-of-tree drivers using the incorrect variable and values to break, preventing incorrect values being used on actual hardware and potentially producing magic smoke. Also include bitops.h explicitly for ffs(), and reorder the header include statements. While at it, also replace module.h with export.h, since the only use is EXPORT_SYMBOL_GPL. Signed-off-by: Chen-Yu Tsai <wenst@chromium.org> Link: https://lore.kernel.org/r/20230714081408.274567-1-wenst@chromium.org Signed-off-by: Mark Brown <broonie@kernel.org>
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_bitfield)
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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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