a538ad229b
Add the core support for the board management controller found on the SMARC-sAL28 board. Also add a virtual symbol which pulls in the simple-mfd-i2c driver and provide a common symbol on which the subdevice drivers can depend on. At the moment, this controller is used on the Kontron SMARC-sAL28 board. Signed-off-by: Michael Walle <michael@walle.cc> Signed-off-by: Lee Jones <lee.jones@linaro.org>
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
// 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");
|