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// SPDX-License-Identifier: GPL-2.0-only
/*
* Simple MFD - I2C
*
* Author(s):
* Michael Walle <michael@walle.cc>
* Lee Jones <lee.jones@linaro.org>
*
* 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 or via the MFD cells in this file
* will be subsequently registered.
*/
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/regmap.h>
#include "simple-mfd-i2c.h"
static const struct regmap_config regmap_config_8r_8v = {
.reg_bits = 8,
.val_bits = 8,
};
static int simple_mfd_i2c_probe(struct i2c_client *i2c)
{
const struct simple_mfd_data *simple_mfd_data;
const struct regmap_config *regmap_config;
struct regmap *regmap;
int ret;
simple_mfd_data = device_get_match_data(&i2c->dev);
/* If no regmap_config is specified, use the default 8reg and 8val bits */
if (!simple_mfd_data || !simple_mfd_data->regmap_config)
regmap_config = ®map_config_8r_8v;
else
regmap_config = simple_mfd_data->regmap_config;
regmap = devm_regmap_init_i2c(i2c, regmap_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
/* If no MFD cells are spedified, use register the DT child nodes instead */
if (!simple_mfd_data || !simple_mfd_data->mfd_cell)
return devm_of_platform_populate(&i2c->dev);
ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
simple_mfd_data->mfd_cell,
simple_mfd_data->mfd_cell_size,
NULL, 0, NULL);
if (ret)
dev_err(&i2c->dev, "Failed to add child devices\n");
return ret;
}
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");
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