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/mod_devicetable.h> 24 #include <linux/module.h> 25 #include <linux/of_platform.h> 26 #include <linux/platform_device.h> 27 #include <linux/property.h> 28 #include <linux/regmap.h> 29 #include <linux/stddef.h> 30 31 #include "simple-mfd-i2c.h" 32 33 static const struct regmap_config regmap_config_8r_8v = { 34 .reg_bits = 8, 35 .val_bits = 8, 36 }; 37 38 static int simple_mfd_i2c_probe(struct i2c_client *i2c) 39 { 40 const struct simple_mfd_data *simple_mfd_data; 41 const struct regmap_config *regmap_config; 42 struct regmap *regmap; 43 int ret; 44 45 simple_mfd_data = device_get_match_data(&i2c->dev); 46 47 /* If no regmap_config is specified, use the default 8reg and 8val bits */ 48 if (!simple_mfd_data || !simple_mfd_data->regmap_config) 49 regmap_config = ®map_config_8r_8v; 50 else 51 regmap_config = simple_mfd_data->regmap_config; 52 53 regmap = devm_regmap_init_i2c(i2c, regmap_config); 54 if (IS_ERR(regmap)) 55 return PTR_ERR(regmap); 56 57 /* If no MFD cells are specified, register using the DT child nodes instead */ 58 if (!simple_mfd_data || !simple_mfd_data->mfd_cell) 59 return devm_of_platform_populate(&i2c->dev); 60 61 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO, 62 simple_mfd_data->mfd_cell, 63 simple_mfd_data->mfd_cell_size, 64 NULL, 0, NULL); 65 if (ret) 66 dev_err(&i2c->dev, "Failed to add child devices\n"); 67 68 return ret; 69 } 70 71 static const struct mfd_cell sy7636a_cells[] = { 72 { .name = "sy7636a-regulator", }, 73 { .name = "sy7636a-temperature", }, 74 }; 75 76 static const struct simple_mfd_data silergy_sy7636a = { 77 .mfd_cell = sy7636a_cells, 78 .mfd_cell_size = ARRAY_SIZE(sy7636a_cells), 79 }; 80 81 static const struct mfd_cell max5970_cells[] = { 82 { .name = "max5970-regulator", }, 83 { .name = "max5970-iio", }, 84 { .name = "max5970-led", }, 85 }; 86 87 static const struct simple_mfd_data maxim_max5970 = { 88 .mfd_cell = max5970_cells, 89 .mfd_cell_size = ARRAY_SIZE(max5970_cells), 90 }; 91 92 static const struct mfd_cell max77705_sensor_cells[] = { 93 { .name = "max77705-battery" }, 94 { .name = "max77705-hwmon", }, 95 }; 96 97 static const struct simple_mfd_data maxim_mon_max77705 = { 98 .mfd_cell = max77705_sensor_cells, 99 .mfd_cell_size = ARRAY_SIZE(max77705_sensor_cells), 100 }; 101 102 static const struct regmap_config spacemit_p1_regmap_config = { 103 .reg_bits = 8, 104 .val_bits = 8, 105 }; 106 107 static const struct mfd_cell spacemit_p1_cells[] = { 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 = "fsl,ls1028aqds-fpga" }, 120 { .compatible = "fsl,lx2160aqds-fpga" }, 121 { .compatible = "fsl,lx2160ardb-fpga" }, 122 { .compatible = "kontron,sl28cpld" }, 123 { .compatible = "maxim,max5970", .data = &maxim_max5970 }, 124 { .compatible = "maxim,max5978", .data = &maxim_max5970 }, 125 { .compatible = "maxim,max77705-battery", .data = &maxim_mon_max77705 }, 126 { .compatible = "silergy,sy7636a", .data = &silergy_sy7636a }, 127 { .compatible = "spacemit,p1", .data = &spacemit_p1 }, 128 {} 129 }; 130 MODULE_DEVICE_TABLE(of, simple_mfd_i2c_of_match); 131 132 static struct i2c_driver simple_mfd_i2c_driver = { 133 .probe = simple_mfd_i2c_probe, 134 .driver = { 135 .name = "simple-mfd-i2c", 136 .of_match_table = simple_mfd_i2c_of_match, 137 }, 138 }; 139 module_i2c_driver(simple_mfd_i2c_driver); 140 141 MODULE_AUTHOR("Michael Walle <michael@walle.cc>"); 142 MODULE_DESCRIPTION("Simple MFD - I2C driver"); 143 MODULE_LICENSE("GPL v2"); 144