1b1b3ced3SMatti Vaittinen // SPDX-License-Identifier: GPL-2.0-or-later
2b1b3ced3SMatti Vaittinen /*
3b1b3ced3SMatti Vaittinen * Copyright (C) 2021 ROHM Semiconductors
4b1b3ced3SMatti Vaittinen *
5b1b3ced3SMatti Vaittinen * ROHM BD9576MUF and BD9573MUF PMIC driver
6b1b3ced3SMatti Vaittinen */
7b1b3ced3SMatti Vaittinen
8b1b3ced3SMatti Vaittinen #include <linux/i2c.h>
9b1b3ced3SMatti Vaittinen #include <linux/interrupt.h>
10b1b3ced3SMatti Vaittinen #include <linux/ioport.h>
11b1b3ced3SMatti Vaittinen #include <linux/irq.h>
12b1b3ced3SMatti Vaittinen #include <linux/mfd/core.h>
13b1b3ced3SMatti Vaittinen #include <linux/mfd/rohm-bd957x.h>
14b1b3ced3SMatti Vaittinen #include <linux/mfd/rohm-generic.h>
15b1b3ced3SMatti Vaittinen #include <linux/module.h>
16*dc0c386eSRob Herring #include <linux/of.h>
17b1b3ced3SMatti Vaittinen #include <linux/regmap.h>
18b1b3ced3SMatti Vaittinen #include <linux/types.h>
19b1b3ced3SMatti Vaittinen
200e969260SMatti Vaittinen enum {
210e969260SMatti Vaittinen BD957X_REGULATOR_CELL,
220e969260SMatti Vaittinen BD957X_WDT_CELL,
230e969260SMatti Vaittinen };
240e969260SMatti Vaittinen
250e969260SMatti Vaittinen /*
26def387a2SJulia Lawall * Due to the BD9576MUF nasty IRQ behaviour we don't always populate IRQs.
270e969260SMatti Vaittinen * These will be added to regulator resources only if IRQ information for the
280e969260SMatti Vaittinen * PMIC is populated in device-tree.
290e969260SMatti Vaittinen */
300e969260SMatti Vaittinen static const struct resource bd9576_regulator_irqs[] = {
310e969260SMatti Vaittinen DEFINE_RES_IRQ_NAMED(BD9576_INT_THERM, "bd9576-temp"),
320e969260SMatti Vaittinen DEFINE_RES_IRQ_NAMED(BD9576_INT_OVD, "bd9576-ovd"),
330e969260SMatti Vaittinen DEFINE_RES_IRQ_NAMED(BD9576_INT_UVD, "bd9576-uvd"),
340e969260SMatti Vaittinen };
350e969260SMatti Vaittinen
36b1b3ced3SMatti Vaittinen static struct mfd_cell bd9573_mfd_cells[] = {
370e969260SMatti Vaittinen [BD957X_REGULATOR_CELL] = { .name = "bd9573-regulator", },
380e969260SMatti Vaittinen [BD957X_WDT_CELL] = { .name = "bd9576-wdt", },
39b1b3ced3SMatti Vaittinen };
40b1b3ced3SMatti Vaittinen
41b1b3ced3SMatti Vaittinen static struct mfd_cell bd9576_mfd_cells[] = {
420e969260SMatti Vaittinen [BD957X_REGULATOR_CELL] = { .name = "bd9576-regulator", },
430e969260SMatti Vaittinen [BD957X_WDT_CELL] = { .name = "bd9576-wdt", },
44b1b3ced3SMatti Vaittinen };
45b1b3ced3SMatti Vaittinen
46b1b3ced3SMatti Vaittinen static const struct regmap_range volatile_ranges[] = {
47b1b3ced3SMatti Vaittinen regmap_reg_range(BD957X_REG_SMRB_ASSERT, BD957X_REG_SMRB_ASSERT),
48b1b3ced3SMatti Vaittinen regmap_reg_range(BD957X_REG_PMIC_INTERNAL_STAT,
49b1b3ced3SMatti Vaittinen BD957X_REG_PMIC_INTERNAL_STAT),
50b1b3ced3SMatti Vaittinen regmap_reg_range(BD957X_REG_INT_THERM_STAT, BD957X_REG_INT_THERM_STAT),
51b1b3ced3SMatti Vaittinen regmap_reg_range(BD957X_REG_INT_OVP_STAT, BD957X_REG_INT_SYS_STAT),
52b1b3ced3SMatti Vaittinen regmap_reg_range(BD957X_REG_INT_MAIN_STAT, BD957X_REG_INT_MAIN_STAT),
53b1b3ced3SMatti Vaittinen };
54b1b3ced3SMatti Vaittinen
55b1b3ced3SMatti Vaittinen static const struct regmap_access_table volatile_regs = {
56b1b3ced3SMatti Vaittinen .yes_ranges = &volatile_ranges[0],
57b1b3ced3SMatti Vaittinen .n_yes_ranges = ARRAY_SIZE(volatile_ranges),
58b1b3ced3SMatti Vaittinen };
59b1b3ced3SMatti Vaittinen
60b1b3ced3SMatti Vaittinen static struct regmap_config bd957x_regmap = {
61b1b3ced3SMatti Vaittinen .reg_bits = 8,
62b1b3ced3SMatti Vaittinen .val_bits = 8,
63b1b3ced3SMatti Vaittinen .volatile_table = &volatile_regs,
64b1b3ced3SMatti Vaittinen .max_register = BD957X_MAX_REGISTER,
65b1b3ced3SMatti Vaittinen .cache_type = REGCACHE_RBTREE,
66b1b3ced3SMatti Vaittinen };
67b1b3ced3SMatti Vaittinen
680e969260SMatti Vaittinen static struct regmap_irq bd9576_irqs[] = {
690e969260SMatti Vaittinen REGMAP_IRQ_REG(BD9576_INT_THERM, 0, BD957X_MASK_INT_MAIN_THERM),
700e969260SMatti Vaittinen REGMAP_IRQ_REG(BD9576_INT_OVP, 0, BD957X_MASK_INT_MAIN_OVP),
710e969260SMatti Vaittinen REGMAP_IRQ_REG(BD9576_INT_SCP, 0, BD957X_MASK_INT_MAIN_SCP),
720e969260SMatti Vaittinen REGMAP_IRQ_REG(BD9576_INT_OCP, 0, BD957X_MASK_INT_MAIN_OCP),
730e969260SMatti Vaittinen REGMAP_IRQ_REG(BD9576_INT_OVD, 0, BD957X_MASK_INT_MAIN_OVD),
740e969260SMatti Vaittinen REGMAP_IRQ_REG(BD9576_INT_UVD, 0, BD957X_MASK_INT_MAIN_UVD),
750e969260SMatti Vaittinen REGMAP_IRQ_REG(BD9576_INT_UVP, 0, BD957X_MASK_INT_MAIN_UVP),
760e969260SMatti Vaittinen REGMAP_IRQ_REG(BD9576_INT_SYS, 0, BD957X_MASK_INT_MAIN_SYS),
770e969260SMatti Vaittinen };
780e969260SMatti Vaittinen
790e969260SMatti Vaittinen static struct regmap_irq_chip bd9576_irq_chip = {
800e969260SMatti Vaittinen .name = "bd9576_irq",
810e969260SMatti Vaittinen .irqs = &bd9576_irqs[0],
820e969260SMatti Vaittinen .num_irqs = ARRAY_SIZE(bd9576_irqs),
830e969260SMatti Vaittinen .status_base = BD957X_REG_INT_MAIN_STAT,
840e969260SMatti Vaittinen .mask_base = BD957X_REG_INT_MAIN_MASK,
850e969260SMatti Vaittinen .ack_base = BD957X_REG_INT_MAIN_STAT,
860e969260SMatti Vaittinen .init_ack_masked = true,
870e969260SMatti Vaittinen .num_regs = 1,
880e969260SMatti Vaittinen .irq_reg_stride = 1,
890e969260SMatti Vaittinen };
900e969260SMatti Vaittinen
bd957x_i2c_probe(struct i2c_client * i2c)91959ecba7SUwe Kleine-König static int bd957x_i2c_probe(struct i2c_client *i2c)
92b1b3ced3SMatti Vaittinen {
93b1b3ced3SMatti Vaittinen int ret;
94b1b3ced3SMatti Vaittinen struct regmap *regmap;
95b1b3ced3SMatti Vaittinen struct mfd_cell *cells;
96b1b3ced3SMatti Vaittinen int num_cells;
97b1b3ced3SMatti Vaittinen unsigned long chip_type;
980e969260SMatti Vaittinen struct irq_domain *domain;
990e969260SMatti Vaittinen bool usable_irqs;
100b1b3ced3SMatti Vaittinen
101b1b3ced3SMatti Vaittinen chip_type = (unsigned long)of_device_get_match_data(&i2c->dev);
102b1b3ced3SMatti Vaittinen
103b1b3ced3SMatti Vaittinen switch (chip_type) {
104b1b3ced3SMatti Vaittinen case ROHM_CHIP_TYPE_BD9576:
105b1b3ced3SMatti Vaittinen cells = bd9576_mfd_cells;
106b1b3ced3SMatti Vaittinen num_cells = ARRAY_SIZE(bd9576_mfd_cells);
1070e969260SMatti Vaittinen usable_irqs = !!i2c->irq;
108b1b3ced3SMatti Vaittinen break;
109b1b3ced3SMatti Vaittinen case ROHM_CHIP_TYPE_BD9573:
110b1b3ced3SMatti Vaittinen cells = bd9573_mfd_cells;
111b1b3ced3SMatti Vaittinen num_cells = ARRAY_SIZE(bd9573_mfd_cells);
1120e969260SMatti Vaittinen /*
1130e969260SMatti Vaittinen * BD9573 only supports fatal IRQs which we can not handle
1140e969260SMatti Vaittinen * because SoC is going to lose the power.
1150e969260SMatti Vaittinen */
1160e969260SMatti Vaittinen usable_irqs = false;
117b1b3ced3SMatti Vaittinen break;
118b1b3ced3SMatti Vaittinen default:
119b1b3ced3SMatti Vaittinen dev_err(&i2c->dev, "Unknown device type");
120b1b3ced3SMatti Vaittinen return -EINVAL;
121b1b3ced3SMatti Vaittinen }
122b1b3ced3SMatti Vaittinen
123b1b3ced3SMatti Vaittinen regmap = devm_regmap_init_i2c(i2c, &bd957x_regmap);
124cb83cb0dSMatti Vaittinen if (IS_ERR(regmap))
125cb83cb0dSMatti Vaittinen return dev_err_probe(&i2c->dev, PTR_ERR(regmap),
126cb83cb0dSMatti Vaittinen "Failed to initialize Regmap\n");
127b1b3ced3SMatti Vaittinen
1280e969260SMatti Vaittinen /*
1290e969260SMatti Vaittinen * BD9576 behaves badly. It kepts IRQ line asserted for the whole
1300e969260SMatti Vaittinen * duration of detected HW condition (like over temperature). So we
1310e969260SMatti Vaittinen * don't require IRQ to be populated.
1320e969260SMatti Vaittinen * If IRQ information is not given, then we mask all IRQs and do not
1330e969260SMatti Vaittinen * provide IRQ resources to regulator driver - which then just omits
1340e969260SMatti Vaittinen * the notifiers.
1350e969260SMatti Vaittinen */
1360e969260SMatti Vaittinen if (usable_irqs) {
1370e969260SMatti Vaittinen struct regmap_irq_chip_data *irq_data;
1380e969260SMatti Vaittinen struct mfd_cell *regulators;
1390e969260SMatti Vaittinen
1400e969260SMatti Vaittinen regulators = &bd9576_mfd_cells[BD957X_REGULATOR_CELL];
1410e969260SMatti Vaittinen regulators->resources = bd9576_regulator_irqs;
1420e969260SMatti Vaittinen regulators->num_resources = ARRAY_SIZE(bd9576_regulator_irqs);
1430e969260SMatti Vaittinen
1440e969260SMatti Vaittinen ret = devm_regmap_add_irq_chip(&i2c->dev, regmap, i2c->irq,
1450e969260SMatti Vaittinen IRQF_ONESHOT, 0,
1460e969260SMatti Vaittinen &bd9576_irq_chip, &irq_data);
147cb83cb0dSMatti Vaittinen if (ret)
148cb83cb0dSMatti Vaittinen return dev_err_probe(&i2c->dev, ret,
149cb83cb0dSMatti Vaittinen "Failed to add IRQ chip\n");
150cb83cb0dSMatti Vaittinen
1510e969260SMatti Vaittinen domain = regmap_irq_get_domain(irq_data);
1520e969260SMatti Vaittinen } else {
1530e969260SMatti Vaittinen ret = regmap_update_bits(regmap, BD957X_REG_INT_MAIN_MASK,
1540e969260SMatti Vaittinen BD957X_MASK_INT_ALL,
1550e969260SMatti Vaittinen BD957X_MASK_INT_ALL);
1560e969260SMatti Vaittinen if (ret)
1570e969260SMatti Vaittinen return ret;
1580e969260SMatti Vaittinen domain = NULL;
1590e969260SMatti Vaittinen }
1600e969260SMatti Vaittinen
161b1b3ced3SMatti Vaittinen ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO, cells,
1620e969260SMatti Vaittinen num_cells, NULL, 0, domain);
163b1b3ced3SMatti Vaittinen if (ret)
164cb83cb0dSMatti Vaittinen dev_err_probe(&i2c->dev, ret, "Failed to create subdevices\n");
165b1b3ced3SMatti Vaittinen
166b1b3ced3SMatti Vaittinen return ret;
167b1b3ced3SMatti Vaittinen }
168b1b3ced3SMatti Vaittinen
169b1b3ced3SMatti Vaittinen static const struct of_device_id bd957x_of_match[] = {
170b1b3ced3SMatti Vaittinen { .compatible = "rohm,bd9576", .data = (void *)ROHM_CHIP_TYPE_BD9576, },
171b1b3ced3SMatti Vaittinen { .compatible = "rohm,bd9573", .data = (void *)ROHM_CHIP_TYPE_BD9573, },
172b1b3ced3SMatti Vaittinen { },
173b1b3ced3SMatti Vaittinen };
174b1b3ced3SMatti Vaittinen MODULE_DEVICE_TABLE(of, bd957x_of_match);
175b1b3ced3SMatti Vaittinen
176b1b3ced3SMatti Vaittinen static struct i2c_driver bd957x_drv = {
177b1b3ced3SMatti Vaittinen .driver = {
178b1b3ced3SMatti Vaittinen .name = "rohm-bd957x",
179b1b3ced3SMatti Vaittinen .of_match_table = bd957x_of_match,
180b1b3ced3SMatti Vaittinen },
1819816d859SUwe Kleine-König .probe = bd957x_i2c_probe,
182b1b3ced3SMatti Vaittinen };
183b1b3ced3SMatti Vaittinen module_i2c_driver(bd957x_drv);
184b1b3ced3SMatti Vaittinen
185b1b3ced3SMatti Vaittinen MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
186b1b3ced3SMatti Vaittinen MODULE_DESCRIPTION("ROHM BD9576MUF and BD9573MUF Power Management IC driver");
187b1b3ced3SMatti Vaittinen MODULE_LICENSE("GPL");
188