Linux: How can I use flow control with dma uart?

Hi tosky,
Have a look at the below thread :
e2e.ti.com/.../627763

Thanks,
prabhuraj
BlackPepper Technologies

Thank you your replay.

Unfortunately, the hardware flow control flag is already set, but the rtc signal is not output.

static void serial_omap_config_port(struct uart_port *port, int flags)
{
struct uart_omap_port *up = to_uart_omap_port(port);

dev_dbg(up->port.dev, "serial_omap_config_port+%d\n",
up->port.line);
up->port.type = PORT_OMAP;
up->port.flags |= UPF_SOFT_FLOW | UPF_HARD_FLOW; <======== here!
}

I also confirmed that up -> port.flags is set to hardware flow.

What can I do more?

thank you.

Hi Tosky,
Thanks for your reply.
The AM335x TRM - page 4368 mentions about UART hw flow control (www.ti.com/.../spruh73p.pdf)
Can you go through the programming model carefully and see if it helps you?

Thanks,
Prabhuraj
BlackPepper Technologies