Source of rtc-m41t80.c - linux-imx - PHYTEC BitBucket (Stash)

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        m41t80_data->rtc->uie_unsupported = 1;
    }
​
    /* Make sure HT (Halt Update) bit is cleared */
    rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_HOUR);
​
    if (rc >= 0 && rc & M41T80_ALHOUR_HT) {
        if (m41t80_data->features & M41T80_FEATURE_HT) {
            m41t80_rtc_read_time(&client->dev, &tm);
            dev_info(&client->dev, "HT bit was set!\n");
            dev_info(&client->dev,
                 "Power Down at %04i-%02i-%02i %02i:%02i:%02i\n",
                 tm.tm_year + 1900,
                 tm.tm_mon + 1, tm.tm_mday, tm.tm_hour,
                 tm.tm_min, tm.tm_sec);
            dev_info(&client->dev, "Power Down at %ptR\n", &tm);
        }
        rc = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_HOUR,
                           rc & ~M41T80_ALHOUR_HT);
    }
​
    if (rc < 0) {
        dev_err(&client->dev, "Can't clear HT bit\n");
        return rc;
    }
​