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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Simple MFD - I2C4 *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 be10 * shared by all sub-devices. Children can use their parent's device structure11 * (dev.parent) in order to reference it.12 *13 * Once the register map has been successfully initialised, any sub-devices14 * represented by child nodes in Device Tree or via the MFD cells in this file15 * will be subsequently registered.16 */17 18#include <linux/i2c.h>19#include <linux/kernel.h>20#include <linux/mfd/core.h>21#include <linux/module.h>22#include <linux/of_platform.h>23#include <linux/regmap.h>24 25#include "simple-mfd-i2c.h"26 27static const struct regmap_config regmap_config_8r_8v = {28 .reg_bits = 8,29 .val_bits = 8,30};31 32static int simple_mfd_i2c_probe(struct i2c_client *i2c)33{34 const struct simple_mfd_data *simple_mfd_data;35 const struct regmap_config *regmap_config;36 struct regmap *regmap;37 int ret;38 39 simple_mfd_data = device_get_match_data(&i2c->dev);40 41 /* If no regmap_config is specified, use the default 8reg and 8val bits */42 if (!simple_mfd_data || !simple_mfd_data->regmap_config)43 regmap_config = ®map_config_8r_8v;44 else45 regmap_config = simple_mfd_data->regmap_config;46 47 regmap = devm_regmap_init_i2c(i2c, regmap_config);48 if (IS_ERR(regmap))49 return PTR_ERR(regmap);50 51 /* If no MFD cells are specified, register using the DT child nodes instead */52 if (!simple_mfd_data || !simple_mfd_data->mfd_cell)53 return devm_of_platform_populate(&i2c->dev);54 55 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,56 simple_mfd_data->mfd_cell,57 simple_mfd_data->mfd_cell_size,58 NULL, 0, NULL);59 if (ret)60 dev_err(&i2c->dev, "Failed to add child devices\n");61 62 return ret;63}64 65static const struct mfd_cell sy7636a_cells[] = {66 { .name = "sy7636a-regulator", },67 { .name = "sy7636a-temperature", },68};69 70static const struct simple_mfd_data silergy_sy7636a = {71 .mfd_cell = sy7636a_cells,72 .mfd_cell_size = ARRAY_SIZE(sy7636a_cells),73};74 75static const struct mfd_cell max5970_cells[] = {76 { .name = "max5970-regulator", },77 { .name = "max5970-iio", },78 { .name = "max5970-led", },79};80 81static const struct simple_mfd_data maxim_max5970 = {82 .mfd_cell = max5970_cells,83 .mfd_cell_size = ARRAY_SIZE(max5970_cells),84};85 86static const struct of_device_id simple_mfd_i2c_of_match[] = {87 { .compatible = "kontron,sl28cpld" },88 { .compatible = "silergy,sy7636a", .data = &silergy_sy7636a},89 { .compatible = "maxim,max5970", .data = &maxim_max5970},90 { .compatible = "maxim,max5978", .data = &maxim_max5970},91 {}92};93MODULE_DEVICE_TABLE(of, simple_mfd_i2c_of_match);94 95static struct i2c_driver simple_mfd_i2c_driver = {96 .probe = simple_mfd_i2c_probe,97 .driver = {98 .name = "simple-mfd-i2c",99 .of_match_table = simple_mfd_i2c_of_match,100 },101};102module_i2c_driver(simple_mfd_i2c_driver);103 104MODULE_AUTHOR("Michael Walle <michael@walle.cc>");105MODULE_DESCRIPTION("Simple MFD - I2C driver");106MODULE_LICENSE("GPL v2");107