// SPDX-License-Identifier: GPL-2.0-only /* * Simple MFD - I2C * * This driver creates a single register map with the intention for it to be * shared by all sub-devices. Children can use their parent's device structure * (dev.parent) in order to reference it. * * Once the register map has been successfully initialised, any sub-devices * represented by child nodes in Device Tree will be subsequently registered. */ #include <linux/i2c.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of_platform.h> #include <linux/regmap.h> static const struct regmap_config simple_regmap_config = { .reg_bits = 8, .val_bits = 8, }; static int simple_mfd_i2c_probe(struct i2c_client *i2c) { const struct regmap_config *config; struct regmap *regmap; config = device_get_match_data(&i2c->dev); if (!config) config = &simple_regmap_config; regmap = devm_regmap_init_i2c(i2c, config); if (IS_ERR(regmap)) return PTR_ERR(regmap); return devm_of_platform_populate(&i2c->dev); } static const struct of_device_id simple_mfd_i2c_of_match[] = { { .compatible = "kontron,sl28cpld" }, {} }; MODULE_DEVICE_TABLE(of, simple_mfd_i2c_of_match); static struct i2c_driver simple_mfd_i2c_driver = { .probe_new = simple_mfd_i2c_probe, .driver = { .name = "simple-mfd-i2c", .of_match_table = simple_mfd_i2c_of_match, }, }; module_i2c_driver(simple_mfd_i2c_driver); MODULE_AUTHOR("Michael Walle <michael@walle.cc>"); MODULE_DESCRIPTION("Simple MFD - I2C driver"); MODULE_LICENSE("GPL v2");