R2x2x_CTRL2_XSTP
if ((rs5c->type == rtc_r2025sd && !(ctrl2 & R2x2x_CTRL2_XSTP)) ||
(rs5c->type == rtc_r2221tl && (ctrl2 & R2x2x_CTRL2_XSTP))) {
ctrl2 |= R2x2x_CTRL2_XSTP;
ctrl2 &= ~R2x2x_CTRL2_XSTP;
if ((rs5c->type == rtc_r2025sd && !(ctrl2 & R2x2x_CTRL2_XSTP)) ||
(rs5c->type == rtc_r2221tl && (ctrl2 & R2x2x_CTRL2_XSTP))) {
if (buf[1] & R2x2x_CTRL2_XSTP)
if (!(buf[1] & R2x2x_CTRL2_XSTP))