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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2023 Holger Assmann, Pengutronix
*/
#include <common.h>
#include <driver.h>
#include <errno.h>
#include <i2c/i2c.h>
#include <init.h>
#include <mfd/pca9450.h>
#include <of.h>
#include <regmap.h>
#include <reset_source.h>
#define REASON_PMIC_RST 0x10
#define REASON_SW_RST 0x20
#define REASON_WDOG 0x40
#define REASON_PWON 0x80
static const struct regmap_config pca9450_regmap_i2c_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0x2E,
};
static int pca9450_get_reset_source(struct device *dev, struct regmap *map)
{
enum reset_src_type type;
int reg;
int ret;
ret = regmap_read(map, PCA9450_PWRON_STAT, ®);
if (ret)
return ret;
switch (reg) {
case REASON_PWON:
dev_dbg(dev, "Power ON triggered by PMIC_ON_REQ.\n");
type = RESET_POR;
break;
case REASON_WDOG:
dev_dbg(dev, "Detected cold reset by WDOGB pin\n");
type = RESET_WDG;
break;
case REASON_SW_RST:
dev_dbg(dev, "Detected cold reset by SW_RST\n");
type = RESET_RST;
break;
case REASON_PMIC_RST:
dev_dbg(dev, "Detected cold reset by PMIC_RST_B\n");
type = RESET_EXT;
break;
default:
dev_warn(dev, "Could not determine reset reason.\n");
type = RESET_UKWN;
}
reset_source_set_device(dev, type);
return 0;
};
static struct regmap *pca9450_map;
static void (*pca9450_init_callback)(struct regmap *map);
int pca9450_register_init_callback(void(*callback)(struct regmap *map))
{
if (pca9450_init_callback)
return -EBUSY;
pca9450_init_callback = callback;
if (pca9450_map)
pca9450_init_callback(pca9450_map);
return 0;
}
static int __init pca9450_probe(struct device *dev)
{
struct regmap *regmap;
int reg;
int ret;
regmap = regmap_init_i2c(to_i2c_client(dev), &pca9450_regmap_i2c_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
ret = regmap_register_cdev(regmap, NULL);
if (ret)
return ret;
ret = regmap_read(regmap, PCA9450_REG_DEV_ID, ®);
if (ret) {
dev_err(dev, "Unable to read PMIC Chip ID\n");
return ret;
}
/* Chip ID defined in bits [7:4] */
dev_info(dev, "PMIC Chip ID: 0x%x\n", (reg >> 4));
if (pca9450_init_callback)
pca9450_init_callback(regmap);
pca9450_map = regmap;
pca9450_get_reset_source(dev,regmap);
return of_platform_populate(dev->of_node, NULL, dev);
}
static __maybe_unused struct of_device_id pca9450_dt_ids[] = {
{ .compatible = "nxp,pca9450a" },
{ .compatible = "nxp,pca9450c" },
{ .compatible = "nxp,pca9451a" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, pca9450_dt_ids);
static struct driver pca9450_i2c_driver = {
.name = "pca9450-i2c",
.probe = pca9450_probe,
.of_compatible = DRV_OF_COMPAT(pca9450_dt_ids),
};
coredevice_i2c_driver(pca9450_i2c_driver);
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