1*3abee457SMichael Walle // SPDX-License-Identifier: GPL-2.0-only 2*3abee457SMichael Walle /* 3*3abee457SMichael Walle * Simple MFD - I2C 4*3abee457SMichael Walle * 5*3abee457SMichael Walle * This driver creates a single register map with the intention for it to be 6*3abee457SMichael Walle * shared by all sub-devices. Children can use their parent's device structure 7*3abee457SMichael Walle * (dev.parent) in order to reference it. 8*3abee457SMichael Walle * 9*3abee457SMichael Walle * Once the register map has been successfully initialised, any sub-devices 10*3abee457SMichael Walle * represented by child nodes in Device Tree will be subsequently registered. 11*3abee457SMichael Walle */ 12*3abee457SMichael Walle 13*3abee457SMichael Walle #include <linux/i2c.h> 14*3abee457SMichael Walle #include <linux/kernel.h> 15*3abee457SMichael Walle #include <linux/module.h> 16*3abee457SMichael Walle #include <linux/of_platform.h> 17*3abee457SMichael Walle #include <linux/regmap.h> 18*3abee457SMichael Walle 19*3abee457SMichael Walle static const struct regmap_config simple_regmap_config = { 20*3abee457SMichael Walle .reg_bits = 8, 21*3abee457SMichael Walle .val_bits = 8, 22*3abee457SMichael Walle }; 23*3abee457SMichael Walle 24*3abee457SMichael Walle static int simple_mfd_i2c_probe(struct i2c_client *i2c) 25*3abee457SMichael Walle { 26*3abee457SMichael Walle const struct regmap_config *config; 27*3abee457SMichael Walle struct regmap *regmap; 28*3abee457SMichael Walle 29*3abee457SMichael Walle config = device_get_match_data(&i2c->dev); 30*3abee457SMichael Walle if (!config) 31*3abee457SMichael Walle config = &simple_regmap_config; 32*3abee457SMichael Walle 33*3abee457SMichael Walle regmap = devm_regmap_init_i2c(i2c, config); 34*3abee457SMichael Walle if (IS_ERR(regmap)) 35*3abee457SMichael Walle return PTR_ERR(regmap); 36*3abee457SMichael Walle 37*3abee457SMichael Walle return devm_of_platform_populate(&i2c->dev); 38*3abee457SMichael Walle } 39*3abee457SMichael Walle 40*3abee457SMichael Walle static const struct of_device_id simple_mfd_i2c_of_match[] = { 41*3abee457SMichael Walle {} 42*3abee457SMichael Walle }; 43*3abee457SMichael Walle MODULE_DEVICE_TABLE(of, simple_mfd_i2c_of_match); 44*3abee457SMichael Walle 45*3abee457SMichael Walle static struct i2c_driver simple_mfd_i2c_driver = { 46*3abee457SMichael Walle .probe_new = simple_mfd_i2c_probe, 47*3abee457SMichael Walle .driver = { 48*3abee457SMichael Walle .name = "simple-mfd-i2c", 49*3abee457SMichael Walle .of_match_table = simple_mfd_i2c_of_match, 50*3abee457SMichael Walle }, 51*3abee457SMichael Walle }; 52*3abee457SMichael Walle module_i2c_driver(simple_mfd_i2c_driver); 53*3abee457SMichael Walle 54*3abee457SMichael Walle MODULE_AUTHOR("Michael Walle <michael@walle.cc>"); 55*3abee457SMichael Walle MODULE_DESCRIPTION("Simple MFD - I2C driver"); 56*3abee457SMichael Walle MODULE_LICENSE("GPL v2"); 57