sysctl_r32
act = sysctl_r32(clk->module, SYSCTL_ACT);
status = sysctl_r32(SYSCTL_SYS1, SYS1_INFRAC);
sysctl_w32(m, (sysctl_r32(m, reg) & ~(clear)) | (set), reg)
do {} while (--err && ((sysctl_r32(clk->module, reg)
sysctl_r32(clk->module, reg) & clk->bits);