WDKEY_SEQ1
iowrite32(WDKEY_SEQ1 | WDEN, davinci_wdt->base + WDTCR);
iowrite32(WDKEY_SEQ1, davinci_wdt->base + WDTCR);
wdtcr = WDKEY_SEQ1 | WDEN;
writel_relaxed(WDKEY_SEQ1, wdt->base + RTIWDKEY);