1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2021 ROHM Semiconductors 4 * 5 * ROHM BD9576MUF and BD9573MUF PMIC driver 6 */ 7 8 #include <linux/i2c.h> 9 #include <linux/interrupt.h> 10 #include <linux/ioport.h> 11 #include <linux/irq.h> 12 #include <linux/mfd/core.h> 13 #include <linux/mfd/rohm-bd957x.h> 14 #include <linux/mfd/rohm-generic.h> 15 #include <linux/module.h> 16 #include <linux/of_device.h> 17 #include <linux/regmap.h> 18 #include <linux/types.h> 19 20 enum { 21 BD957X_REGULATOR_CELL, 22 BD957X_WDT_CELL, 23 }; 24 25 /* 26 * Due to the BD9576MUF nasty IRQ behaviour we don't always populate IRQs. 27 * These will be added to regulator resources only if IRQ information for the 28 * PMIC is populated in device-tree. 29 */ 30 static const struct resource bd9576_regulator_irqs[] = { 31 DEFINE_RES_IRQ_NAMED(BD9576_INT_THERM, "bd9576-temp"), 32 DEFINE_RES_IRQ_NAMED(BD9576_INT_OVD, "bd9576-ovd"), 33 DEFINE_RES_IRQ_NAMED(BD9576_INT_UVD, "bd9576-uvd"), 34 }; 35 36 static struct mfd_cell bd9573_mfd_cells[] = { 37 [BD957X_REGULATOR_CELL] = { .name = "bd9573-regulator", }, 38 [BD957X_WDT_CELL] = { .name = "bd9576-wdt", }, 39 }; 40 41 static struct mfd_cell bd9576_mfd_cells[] = { 42 [BD957X_REGULATOR_CELL] = { .name = "bd9576-regulator", }, 43 [BD957X_WDT_CELL] = { .name = "bd9576-wdt", }, 44 }; 45 46 static const struct regmap_range volatile_ranges[] = { 47 regmap_reg_range(BD957X_REG_SMRB_ASSERT, BD957X_REG_SMRB_ASSERT), 48 regmap_reg_range(BD957X_REG_PMIC_INTERNAL_STAT, 49 BD957X_REG_PMIC_INTERNAL_STAT), 50 regmap_reg_range(BD957X_REG_INT_THERM_STAT, BD957X_REG_INT_THERM_STAT), 51 regmap_reg_range(BD957X_REG_INT_OVP_STAT, BD957X_REG_INT_SYS_STAT), 52 regmap_reg_range(BD957X_REG_INT_MAIN_STAT, BD957X_REG_INT_MAIN_STAT), 53 }; 54 55 static const struct regmap_access_table volatile_regs = { 56 .yes_ranges = &volatile_ranges[0], 57 .n_yes_ranges = ARRAY_SIZE(volatile_ranges), 58 }; 59 60 static struct regmap_config bd957x_regmap = { 61 .reg_bits = 8, 62 .val_bits = 8, 63 .volatile_table = &volatile_regs, 64 .max_register = BD957X_MAX_REGISTER, 65 .cache_type = REGCACHE_RBTREE, 66 }; 67 68 static struct regmap_irq bd9576_irqs[] = { 69 REGMAP_IRQ_REG(BD9576_INT_THERM, 0, BD957X_MASK_INT_MAIN_THERM), 70 REGMAP_IRQ_REG(BD9576_INT_OVP, 0, BD957X_MASK_INT_MAIN_OVP), 71 REGMAP_IRQ_REG(BD9576_INT_SCP, 0, BD957X_MASK_INT_MAIN_SCP), 72 REGMAP_IRQ_REG(BD9576_INT_OCP, 0, BD957X_MASK_INT_MAIN_OCP), 73 REGMAP_IRQ_REG(BD9576_INT_OVD, 0, BD957X_MASK_INT_MAIN_OVD), 74 REGMAP_IRQ_REG(BD9576_INT_UVD, 0, BD957X_MASK_INT_MAIN_UVD), 75 REGMAP_IRQ_REG(BD9576_INT_UVP, 0, BD957X_MASK_INT_MAIN_UVP), 76 REGMAP_IRQ_REG(BD9576_INT_SYS, 0, BD957X_MASK_INT_MAIN_SYS), 77 }; 78 79 static struct regmap_irq_chip bd9576_irq_chip = { 80 .name = "bd9576_irq", 81 .irqs = &bd9576_irqs[0], 82 .num_irqs = ARRAY_SIZE(bd9576_irqs), 83 .status_base = BD957X_REG_INT_MAIN_STAT, 84 .mask_base = BD957X_REG_INT_MAIN_MASK, 85 .ack_base = BD957X_REG_INT_MAIN_STAT, 86 .init_ack_masked = true, 87 .num_regs = 1, 88 .irq_reg_stride = 1, 89 }; 90 91 static int bd957x_i2c_probe(struct i2c_client *i2c) 92 { 93 int ret; 94 struct regmap *regmap; 95 struct mfd_cell *cells; 96 int num_cells; 97 unsigned long chip_type; 98 struct irq_domain *domain; 99 bool usable_irqs; 100 101 chip_type = (unsigned long)of_device_get_match_data(&i2c->dev); 102 103 switch (chip_type) { 104 case ROHM_CHIP_TYPE_BD9576: 105 cells = bd9576_mfd_cells; 106 num_cells = ARRAY_SIZE(bd9576_mfd_cells); 107 usable_irqs = !!i2c->irq; 108 break; 109 case ROHM_CHIP_TYPE_BD9573: 110 cells = bd9573_mfd_cells; 111 num_cells = ARRAY_SIZE(bd9573_mfd_cells); 112 /* 113 * BD9573 only supports fatal IRQs which we can not handle 114 * because SoC is going to lose the power. 115 */ 116 usable_irqs = false; 117 break; 118 default: 119 dev_err(&i2c->dev, "Unknown device type"); 120 return -EINVAL; 121 } 122 123 regmap = devm_regmap_init_i2c(i2c, &bd957x_regmap); 124 if (IS_ERR(regmap)) 125 return dev_err_probe(&i2c->dev, PTR_ERR(regmap), 126 "Failed to initialize Regmap\n"); 127 128 /* 129 * BD9576 behaves badly. It kepts IRQ line asserted for the whole 130 * duration of detected HW condition (like over temperature). So we 131 * don't require IRQ to be populated. 132 * If IRQ information is not given, then we mask all IRQs and do not 133 * provide IRQ resources to regulator driver - which then just omits 134 * the notifiers. 135 */ 136 if (usable_irqs) { 137 struct regmap_irq_chip_data *irq_data; 138 struct mfd_cell *regulators; 139 140 regulators = &bd9576_mfd_cells[BD957X_REGULATOR_CELL]; 141 regulators->resources = bd9576_regulator_irqs; 142 regulators->num_resources = ARRAY_SIZE(bd9576_regulator_irqs); 143 144 ret = devm_regmap_add_irq_chip(&i2c->dev, regmap, i2c->irq, 145 IRQF_ONESHOT, 0, 146 &bd9576_irq_chip, &irq_data); 147 if (ret) 148 return dev_err_probe(&i2c->dev, ret, 149 "Failed to add IRQ chip\n"); 150 151 domain = regmap_irq_get_domain(irq_data); 152 } else { 153 ret = regmap_update_bits(regmap, BD957X_REG_INT_MAIN_MASK, 154 BD957X_MASK_INT_ALL, 155 BD957X_MASK_INT_ALL); 156 if (ret) 157 return ret; 158 domain = NULL; 159 } 160 161 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO, cells, 162 num_cells, NULL, 0, domain); 163 if (ret) 164 dev_err_probe(&i2c->dev, ret, "Failed to create subdevices\n"); 165 166 return ret; 167 } 168 169 static const struct of_device_id bd957x_of_match[] = { 170 { .compatible = "rohm,bd9576", .data = (void *)ROHM_CHIP_TYPE_BD9576, }, 171 { .compatible = "rohm,bd9573", .data = (void *)ROHM_CHIP_TYPE_BD9573, }, 172 { }, 173 }; 174 MODULE_DEVICE_TABLE(of, bd957x_of_match); 175 176 static struct i2c_driver bd957x_drv = { 177 .driver = { 178 .name = "rohm-bd957x", 179 .of_match_table = bd957x_of_match, 180 }, 181 .probe = bd957x_i2c_probe, 182 }; 183 module_i2c_driver(bd957x_drv); 184 185 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>"); 186 MODULE_DESCRIPTION("ROHM BD9576MUF and BD9573MUF Power Management IC driver"); 187 MODULE_LICENSE("GPL"); 188