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Add support for the regulators found in the SpacemiT P1 PMIC. This PMIC provides 6 buck converters and 12 LDO regulators. The PMIC is implemented as a multi-function device. These regulators are probed based on this driver being named in a MFD cell in the simple MFD I2C driver. Signed-off-by: Alex Elder <elder@riscstar.com> Link: https://patch.msgid.link/20250825172057.163883-4-elder@riscstar.com Signed-off-by: Mark Brown <broonie@kernel.org>
158 lines
3.9 KiB
C
158 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Driver for regulators found in the SpacemiT P1 PMIC
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*
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* Copyright (C) 2025 by RISCstar Solutions Corporation. All rights reserved.
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* Derived from code from SpacemiT.
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* Copyright (c) 2023, SPACEMIT Co., Ltd
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*/
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#include <linux/array_size.h>
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#include <linux/bits.h>
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#include <linux/device.h>
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#include <linux/linear_range.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#define MOD_NAME "spacemit-p1-regulator"
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enum p1_regulator_id {
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P1_BUCK1,
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P1_BUCK2,
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P1_BUCK3,
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P1_BUCK4,
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P1_BUCK5,
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P1_BUCK6,
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P1_ALDO1,
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P1_ALDO2,
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P1_ALDO3,
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P1_ALDO4,
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P1_DLDO1,
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P1_DLDO2,
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P1_DLDO3,
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P1_DLDO4,
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P1_DLDO5,
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P1_DLDO6,
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P1_DLDO7,
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};
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static const struct regulator_ops p1_regulator_ops = {
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.list_voltage = regulator_list_voltage_linear_range,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.set_voltage_time_sel = regulator_set_voltage_time_sel,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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};
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/* Selector value 255 can be used to disable the buck converter on sleep */
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static const struct linear_range p1_buck_ranges[] = {
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REGULATOR_LINEAR_RANGE(500000, 0, 170, 5000),
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REGULATOR_LINEAR_RANGE(1375000, 171, 254, 25000),
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};
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/* Selector value 0 can be used for suspend */
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static const struct linear_range p1_ldo_ranges[] = {
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REGULATOR_LINEAR_RANGE(500000, 11, 127, 25000),
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};
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/* These define the voltage selector field for buck and LDO regulators */
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#define BUCK_MASK GENMASK(7, 0)
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#define LDO_MASK GENMASK(6, 0)
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#define P1_ID(_TYPE, _n) P1_ ## _TYPE ## _n
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#define P1_ENABLE_REG(_off, _n) ((_off) + 3 * ((_n) - 1))
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#define P1_REG_DESC(_TYPE, _type, _n, _s, _off, _mask, _nv, _ranges) \
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{ \
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.name = #_type #_n, \
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.supply_name = _s, \
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.of_match = of_match_ptr(#_type #_n), \
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.regulators_node = of_match_ptr("regulators"), \
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.id = P1_ID(_TYPE, _n), \
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.n_voltages = _nv, \
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.ops = &p1_regulator_ops, \
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.owner = THIS_MODULE, \
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.linear_ranges = _ranges, \
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.n_linear_ranges = ARRAY_SIZE(_ranges), \
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.vsel_reg = P1_ENABLE_REG(_off, _n) + 1, \
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.vsel_mask = _mask, \
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.enable_reg = P1_ENABLE_REG(_off, _n), \
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.enable_mask = BIT(0), \
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}
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#define P1_BUCK_DESC(_n) \
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P1_REG_DESC(BUCK, buck, _n, "vcc", 0x47, BUCK_MASK, 254, p1_buck_ranges)
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#define P1_ALDO_DESC(_n) \
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P1_REG_DESC(ALDO, aldo, _n, "vcc", 0x5b, LDO_MASK, 117, p1_ldo_ranges)
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#define P1_DLDO_DESC(_n) \
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P1_REG_DESC(DLDO, dldo, _n, "buck5", 0x67, LDO_MASK, 117, p1_ldo_ranges)
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static const struct regulator_desc p1_regulator_desc[] = {
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P1_BUCK_DESC(1),
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P1_BUCK_DESC(2),
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P1_BUCK_DESC(3),
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P1_BUCK_DESC(4),
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P1_BUCK_DESC(5),
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P1_BUCK_DESC(6),
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P1_ALDO_DESC(1),
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P1_ALDO_DESC(2),
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P1_ALDO_DESC(3),
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P1_ALDO_DESC(4),
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P1_DLDO_DESC(1),
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P1_DLDO_DESC(2),
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P1_DLDO_DESC(3),
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P1_DLDO_DESC(4),
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P1_DLDO_DESC(5),
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P1_DLDO_DESC(6),
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P1_DLDO_DESC(7),
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};
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static int p1_regulator_probe(struct platform_device *pdev)
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{
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struct regulator_config config = { };
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struct device *dev = &pdev->dev;
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u32 i;
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/*
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* The parent device (PMIC) owns the regmap. Since we don't
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* provide one in the config structure, that one will be used.
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*/
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config.dev = dev->parent;
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for (i = 0; i < ARRAY_SIZE(p1_regulator_desc); i++) {
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const struct regulator_desc *desc = &p1_regulator_desc[i];
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struct regulator_dev *rdev;
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rdev = devm_regulator_register(dev, desc, &config);
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if (IS_ERR(rdev))
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return dev_err_probe(dev, PTR_ERR(rdev),
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"error registering regulator %s\n",
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desc->name);
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}
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return 0;
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}
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static struct platform_driver p1_regulator_driver = {
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.probe = p1_regulator_probe,
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.driver = {
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.name = MOD_NAME,
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},
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};
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module_platform_driver(p1_regulator_driver);
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MODULE_DESCRIPTION("SpacemiT P1 regulator driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:" MOD_NAME);
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