RP2_UART_CTL
rp2_rmw(up, RP2_UART_CTL,
rp2_rmw_set(up, RP2_UART_CTL,
readl(up->base + RP2_UART_CTL);
rp2_rmw_clr(up, RP2_UART_CTL,
writel(RP2_UART_CTL_RESET_CH_m, up->base + RP2_UART_CTL);
readl(up->base + RP2_UART_CTL);
writel(0, up->base + RP2_UART_CTL);
readl(up->base + RP2_UART_CTL);
rp2_rmw(up, RP2_UART_CTL, RP2_UART_CTL_MODE_m,