1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Simple MFD - I2C 4 * 5 * Author(s): 6 * Michael Walle <michael@walle.cc> 7 * Lee Jones <lee.jones@linaro.org> 8 * 9 * This driver creates a single register map with the intention for it to be 10 * shared by all sub-devices. Children can use their parent's device structure 11 * (dev.parent) in order to reference it. 12 * 13 * Once the register map has been successfully initialised, any sub-devices 14 * represented by child nodes in Device Tree or via the MFD cells in this file 15 * will be subsequently registered. 16 */ 17 18 #include <linux/array_size.h> 19 #include <linux/dev_printk.h> 20 #include <linux/err.h> 21 #include <linux/i2c.h> 22 #include <linux/mfd/core.h> 23 #include <linux/module.h> 24 #include <linux/of_platform.h> 25 #include <linux/platform_device.h> 26 #include <linux/property.h> 27 #include <linux/regmap.h> 28 #include <linux/stddef.h> 29 30 #include "simple-mfd-i2c.h" 31 32 static const struct regmap_config regmap_config_8r_8v = { 33 .reg_bits = 8, 34 .val_bits = 8, 35 }; 36 37 static int simple_mfd_i2c_probe(struct i2c_client *i2c) 38 { 39 const struct simple_mfd_data *simple_mfd_data; 40 const struct regmap_config *regmap_config; 41 struct regmap *regmap; 42 int ret; 43 44 simple_mfd_data = device_get_match_data(&i2c->dev); 45 46 /* If no regmap_config is specified, use the default 8reg and 8val bits */ 47 if (!simple_mfd_data || !simple_mfd_data->regmap_config) 48 regmap_config = ®map_config_8r_8v; 49 else 50 regmap_config = simple_mfd_data->regmap_config; 51 52 regmap = devm_regmap_init_i2c(i2c, regmap_config); 53 if (IS_ERR(regmap)) 54 return PTR_ERR(regmap); 55 56 /* If no MFD cells are specified, register using the DT child nodes instead */ 57 if (!simple_mfd_data || !simple_mfd_data->mfd_cell) 58 return devm_of_platform_populate(&i2c->dev); 59 60 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO, 61 simple_mfd_data->mfd_cell, 62 simple_mfd_data->mfd_cell_size, 63 NULL, 0, NULL); 64 if (ret) 65 dev_err(&i2c->dev, "Failed to add child devices\n"); 66 67 return ret; 68 } 69 70 static const struct mfd_cell sy7636a_cells[] = { 71 { .name = "sy7636a-regulator", }, 72 { .name = "sy7636a-temperature", }, 73 }; 74 75 static const struct simple_mfd_data silergy_sy7636a = { 76 .mfd_cell = sy7636a_cells, 77 .mfd_cell_size = ARRAY_SIZE(sy7636a_cells), 78 }; 79 80 static const struct mfd_cell max5970_cells[] = { 81 { .name = "max5970-regulator", }, 82 { .name = "max5970-iio", }, 83 { .name = "max5970-led", }, 84 }; 85 86 static const struct simple_mfd_data maxim_max5970 = { 87 .mfd_cell = max5970_cells, 88 .mfd_cell_size = ARRAY_SIZE(max5970_cells), 89 }; 90 91 static const struct mfd_cell max77705_sensor_cells[] = { 92 { .name = "max77705-battery" }, 93 { .name = "max77705-hwmon", }, 94 }; 95 96 static const struct simple_mfd_data maxim_mon_max77705 = { 97 .mfd_cell = max77705_sensor_cells, 98 .mfd_cell_size = ARRAY_SIZE(max77705_sensor_cells), 99 }; 100 101 static const struct regmap_config spacemit_p1_regmap_config = { 102 .reg_bits = 8, 103 .val_bits = 8, 104 }; 105 106 static const struct mfd_cell spacemit_p1_cells[] = { 107 { .name = "spacemit-p1-reboot", }, 108 { .name = "spacemit-p1-regulator", }, 109 { .name = "spacemit-p1-rtc", }, 110 }; 111 112 static const struct simple_mfd_data spacemit_p1 = { 113 .regmap_config = &spacemit_p1_regmap_config, 114 .mfd_cell = spacemit_p1_cells, 115 .mfd_cell_size = ARRAY_SIZE(spacemit_p1_cells), 116 }; 117 118 static const struct of_device_id simple_mfd_i2c_of_match[] = { 119 { .compatible = "delta,tn48m-cpld" }, 120 { .compatible = "fsl,ls1028aqds-fpga" }, 121 { .compatible = "fsl,lx2160aqds-fpga" }, 122 { .compatible = "fsl,lx2160ardb-fpga" }, 123 { .compatible = "kontron,sl28cpld" }, 124 { .compatible = "maxim,max5970", .data = &maxim_max5970 }, 125 { .compatible = "maxim,max5978", .data = &maxim_max5970 }, 126 { .compatible = "maxim,max77705-battery", .data = &maxim_mon_max77705 }, 127 { .compatible = "silergy,sy7636a", .data = &silergy_sy7636a }, 128 { .compatible = "spacemit,p1", .data = &spacemit_p1 }, 129 {} 130 }; 131 MODULE_DEVICE_TABLE(of, simple_mfd_i2c_of_match); 132 133 static struct i2c_driver simple_mfd_i2c_driver = { 134 .probe = simple_mfd_i2c_probe, 135 .driver = { 136 .name = "simple-mfd-i2c", 137 .of_match_table = simple_mfd_i2c_of_match, 138 }, 139 }; 140 module_i2c_driver(simple_mfd_i2c_driver); 141 142 MODULE_AUTHOR("Michael Walle <michael@walle.cc>"); 143 MODULE_DESCRIPTION("Simple MFD - I2C driver"); 144 MODULE_LICENSE("GPL v2"); 145