USDHI6_SD_CLK_CTRL
val = usdhi6_read(host, USDHI6_SD_CLK_CTRL) & ~USDHI6_SD_CLK_CTRL_DIV_MASK;
usdhi6_write(host, USDHI6_SD_CLK_CTRL,
usdhi6_write(host, USDHI6_SD_CLK_CTRL, val);
usdhi6_write(host, USDHI6_SD_CLK_CTRL,