+static int ds3231_rtc_set(struct udevice *dev, const struct rtc_time *tmp)
+{
+ uchar century;
+
+ debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
+ tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
+ tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
+
+ dm_i2c_reg_write(dev, RTC_YR_REG_ADDR, bin2bcd(tmp->tm_year % 100));
+
+ century = (tmp->tm_year >= 2000) ? 0x80 : 0;
+ dm_i2c_reg_write(dev, RTC_MON_REG_ADDR, bin2bcd(tmp->tm_mon) | century);
+
+ dm_i2c_reg_write(dev, RTC_DAY_REG_ADDR, bin2bcd(tmp->tm_wday + 1));
+ dm_i2c_reg_write(dev, RTC_DATE_REG_ADDR, bin2bcd(tmp->tm_mday));
+ dm_i2c_reg_write(dev, RTC_HR_REG_ADDR, bin2bcd(tmp->tm_hour));
+ dm_i2c_reg_write(dev, RTC_MIN_REG_ADDR, bin2bcd(tmp->tm_min));
+ dm_i2c_reg_write(dev, RTC_SEC_REG_ADDR, bin2bcd(tmp->tm_sec));
+
+ return 0;
+}
+
+static int ds3231_rtc_reset(struct udevice *dev)
+{
+ int ret;
+
+ ret = dm_i2c_reg_write(dev, RTC_CTL_REG_ADDR,
+ RTC_CTL_BIT_RS1 | RTC_CTL_BIT_RS2);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int ds3231_probe(struct udevice *dev)
+{
+ i2c_set_chip_flags(dev, DM_I2C_CHIP_RD_ADDRESS |
+ DM_I2C_CHIP_WR_ADDRESS);
+
+ return 0;
+}
+
+#ifdef CONFIG_RTC_ENABLE_32KHZ_OUTPUT
+int rtc_enable_32khz_output(int busnum, int chip_addr)
+{
+ int ret;
+ struct udevice *dev;
+
+ ret = i2c_get_chip_for_busnum(busnum, chip_addr, 1, &dev);
+ if (!ret) {
+ ret = dm_i2c_reg_write(dev, RTC_STAT_REG_ADDR,
+ RTC_STAT_BIT_BB32KHZ |
+ RTC_STAT_BIT_EN32KHZ);
+ }
+ return ret;
+}
+#endif
+
+static const struct rtc_ops ds3231_rtc_ops = {
+ .get = ds3231_rtc_get,
+ .set = ds3231_rtc_set,
+ .reset = ds3231_rtc_reset,
+};
+
+static const struct udevice_id ds3231_rtc_ids[] = {
+ { .compatible = "dallas,ds3231" },
+ { .compatible = "dallas,ds3232" },
+ { }
+};
+
+U_BOOT_DRIVER(rtc_ds3231) = {
+ .name = "rtc-ds3231",
+ .id = UCLASS_RTC,
+ .probe = ds3231_probe,
+ .of_match = ds3231_rtc_ids,
+ .ops = &ds3231_rtc_ops,
+};