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 const struct i2c_device_id *id) 93 { 94 int ret; 95 struct regmap *regmap; 96 struct mfd_cell *cells; 97 int num_cells; 98 unsigned long chip_type; 99 struct irq_domain *domain; 100 bool usable_irqs; 101 102 chip_type = (unsigned long)of_device_get_match_data(&i2c->dev); 103 104 switch (chip_type) { 105 case ROHM_CHIP_TYPE_BD9576: 106 cells = bd9576_mfd_cells; 107 num_cells = ARRAY_SIZE(bd9576_mfd_cells); 108 usable_irqs = !!i2c->irq; 109 break; 110 case ROHM_CHIP_TYPE_BD9573: 111 cells = bd9573_mfd_cells; 112 num_cells = ARRAY_SIZE(bd9573_mfd_cells); 113 /* 114 * BD9573 only supports fatal IRQs which we can not handle 115 * because SoC is going to lose the power. 116 */ 117 usable_irqs = false; 118 break; 119 default: 120 dev_err(&i2c->dev, "Unknown device type"); 121 return -EINVAL; 122 } 123 124 regmap = devm_regmap_init_i2c(i2c, &bd957x_regmap); 125 if (IS_ERR(regmap)) { 126 dev_err(&i2c->dev, "Failed to initialize Regmap\n"); 127 return PTR_ERR(regmap); 128 } 129 130 /* 131 * BD9576 behaves badly. It kepts IRQ line asserted for the whole 132 * duration of detected HW condition (like over temperature). So we 133 * don't require IRQ to be populated. 134 * If IRQ information is not given, then we mask all IRQs and do not 135 * provide IRQ resources to regulator driver - which then just omits 136 * the notifiers. 137 */ 138 if (usable_irqs) { 139 struct regmap_irq_chip_data *irq_data; 140 struct mfd_cell *regulators; 141 142 regulators = &bd9576_mfd_cells[BD957X_REGULATOR_CELL]; 143 regulators->resources = bd9576_regulator_irqs; 144 regulators->num_resources = ARRAY_SIZE(bd9576_regulator_irqs); 145 146 ret = devm_regmap_add_irq_chip(&i2c->dev, regmap, i2c->irq, 147 IRQF_ONESHOT, 0, 148 &bd9576_irq_chip, &irq_data); 149 if (ret) { 150 dev_err(&i2c->dev, "Failed to add IRQ chip\n"); 151 return ret; 152 } 153 domain = regmap_irq_get_domain(irq_data); 154 } else { 155 ret = regmap_update_bits(regmap, BD957X_REG_INT_MAIN_MASK, 156 BD957X_MASK_INT_ALL, 157 BD957X_MASK_INT_ALL); 158 if (ret) 159 return ret; 160 domain = NULL; 161 } 162 163 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO, cells, 164 num_cells, NULL, 0, domain); 165 if (ret) 166 dev_err(&i2c->dev, "Failed to create subdevices\n"); 167 168 return ret; 169 } 170 171 static const struct of_device_id bd957x_of_match[] = { 172 { .compatible = "rohm,bd9576", .data = (void *)ROHM_CHIP_TYPE_BD9576, }, 173 { .compatible = "rohm,bd9573", .data = (void *)ROHM_CHIP_TYPE_BD9573, }, 174 { }, 175 }; 176 MODULE_DEVICE_TABLE(of, bd957x_of_match); 177 178 static struct i2c_driver bd957x_drv = { 179 .driver = { 180 .name = "rohm-bd957x", 181 .of_match_table = bd957x_of_match, 182 }, 183 .probe = &bd957x_i2c_probe, 184 }; 185 module_i2c_driver(bd957x_drv); 186 187 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>"); 188 MODULE_DESCRIPTION("ROHM BD9576MUF and BD9573MUF Power Management IC driver"); 189 MODULE_LICENSE("GPL"); 190