M41T93_REG_ST_SEC
tm->tm_sec = bcd2bin(buf[M41T93_REG_ST_SEC]);
u8 reset_osc = buf[M41T93_REG_ST_SEC] | M41T93_FLAG_ST;
m41t93_set_reg(spi, M41T93_REG_ST_SEC, reset_osc);
m41t93_set_reg(spi, M41T93_REG_ST_SEC, reset_osc);
data[M41T93_REG_ST_SEC] = bin2bcd(tm->tm_sec);