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// SPDX-License-Identifier: GPL-2.0-only
/*
* PCF85063 and compatible I2C RTC driver
*
* Copyright (c) 2025 Kontron Europe GmbH.
*/
#include <dm.h>
#include <i2c.h>
#include <rtc.h>
#include <dm/device_compat.h>
#define PCF85063_REG_CTRL1 0x00 /* status */
#define PCF85063_REG_CTRL1_SR 0x58
#define PCF85063_REG_SC 0x04 /* datetime */
#define PCF85063_REG_SC_OS 0x80
static int pcf85063_get_time(struct udevice *dev, struct rtc_time *tm)
{
u8 regs[7];
int ret;
ret = dm_i2c_read(dev, PCF85063_REG_SC, regs, sizeof(regs));
if (ret)
return ret;
if (regs[0] & PCF85063_REG_SC_OS) {
dev_err(dev, "Power loss detected, Invalid time\n");
return -EINVAL;
}
tm->tm_sec = bcd2bin(regs[0] & 0x7f);
tm->tm_min = bcd2bin(regs[1] & 0x7f);
tm->tm_hour = bcd2bin(regs[2] & 0x3f);
tm->tm_mday = bcd2bin(regs[3] & 0x3f);
tm->tm_wday = regs[4] & 0x07;
tm->tm_mon = bcd2bin(regs[5] & 0x1f) - 1;
tm->tm_year = bcd2bin(regs[6]) + 2000;
return 0;
}
static int pcf85063_set_time(struct udevice *dev, const struct rtc_time *tm)
{
u8 regs[7];
if (tm->tm_year < 2000 || tm->tm_year > 2099) {
dev_err(dev, "Year must be between 2000 and 2099.\n");
return -EINVAL;
}
regs[0] = bin2bcd(tm->tm_sec);
regs[1] = bin2bcd(tm->tm_min);
regs[2] = bin2bcd(tm->tm_hour);
regs[3] = bin2bcd(tm->tm_mday);
regs[4] = tm->tm_wday;
regs[5] = bin2bcd(tm->tm_mon + 1);
regs[6] = bin2bcd(tm->tm_year % 100);
return dm_i2c_write(dev, PCF85063_REG_SC, regs, sizeof(regs));
}
static int pcf85063_reset(struct udevice *dev)
{
return dm_i2c_reg_write(dev, PCF85063_REG_CTRL1, PCF85063_REG_CTRL1_SR);
}
static int pcf85063_read(struct udevice *dev, unsigned int offset, u8 *buf,
unsigned int len)
{
return dm_i2c_read(dev, offset, buf, len);
}
static int pcf85063_write(struct udevice *dev, unsigned int offset,
const u8 *buf, unsigned int len)
{
return dm_i2c_write(dev, offset, buf, len);
}
static const struct rtc_ops pcf85063_rtc_ops = {
.get = pcf85063_get_time,
.set = pcf85063_set_time,
.reset = pcf85063_reset,
.read = pcf85063_read,
.write = pcf85063_write,
};
static int pcf85063_probe(struct udevice *dev)
{
i2c_set_chip_flags(dev, DM_I2C_CHIP_RD_ADDRESS | DM_I2C_CHIP_WR_ADDRESS);
return 0;
}
static const struct udevice_id pcf85063_of_id[] = {
{ .compatible = "microcrystal,rv8263" },
{ }
};
U_BOOT_DRIVER(rtc_pcf85063) = {
.name = "rtc-pcf85063",
.id = UCLASS_RTC,
.probe = pcf85063_probe,
.of_match = pcf85063_of_id,
.ops = &pcf85063_rtc_ops,
};
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