MU3D_EP_RXCR2
mtu3_writel(mbase, MU3D_EP_RXCR2(epnum), csr2);
mtu3_readl(mbase, MU3D_EP_RXCR2(epnum)));
mtu3_writel(mbase, MU3D_EP_RXCR2(epnum), 0);
regs[2].offset = in ? MU3D_EP_TXCR2(epnum) : MU3D_EP_RXCR2(epnum);