BUTTRESS_REG_SLEEP_LEVEL_STS
ret = readl_poll_timeout(isp->base + BUTTRESS_REG_SLEEP_LEVEL_STS,
u32 sleep_level_reg = BUTTRESS_REG_SLEEP_LEVEL_STS;
val = readl(isp->base + BUTTRESS_REG_SLEEP_LEVEL_STS);