Commit 20ff2fe6 authored by Huang Shijie's avatar Huang Shijie Committed by Greg Kroah-Hartman
Browse files

serial: imx: add support for DTE mode 



The uart works in the DCE mode by default, but sometime we need it
works at the DTE mode.

This patch adds the support for the DTE mode.

Signed-off-by: default avatarHuang Shijie <b32955@freescale.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2cb5a2fa

Documentation/devicetree/bindings/tty/serial/fsl-imx-uart.txt

+3 −0
Original line number Diff line number Diff line
@@ -8,6 +8,8 @@ Required properties: 
Optional properties:

- fsl,uart-has-rtscts : Indicate the uart has rts and cts

- fsl,irda-mode : Indicate the uart supports irda mode

- fsl,dte-mode : Indicate the uart works in DTE mode. The uart works

                  is DCE mode by default.



Example:
@@ -16,4 +18,5 @@ serial@73fbc000 { 
	reg = <0x73fbc000 0x4000>;

	interrupts = <31>;

	fsl,uart-has-rtscts;

	fsl,dte-mode;

};

drivers/tty/serial/imx.c

+6 −0
Original line number Diff line number Diff line
@@ -201,6 +201,7 @@ struct imx_port { 
	unsigned int		old_status;

	int			txirq, rxirq, rtsirq;

	unsigned int		have_rtscts:1;

	unsigned int		dte_mode:1;

	unsigned int		use_irda:1;

	unsigned int		irda_inv_rx:1;

	unsigned int		irda_inv_tx:1;
@@ -1020,6 +1021,8 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios, 


	ufcr = readl(sport->port.membase + UFCR);

	ufcr = (ufcr & (~UFCR_RFDIV)) | UFCR_RFDIV_REG(div);

	if (sport->dte_mode)

		ufcr |= UFCR_DCEDTE;

	writel(ufcr, sport->port.membase + UFCR);



	writel(num, sport->port.membase + UBIR);
@@ -1444,6 +1447,9 @@ static int serial_imx_probe_dt(struct imx_port *sport, 
	if (of_get_property(np, "fsl,irda-mode", NULL))

		sport->use_irda = 1;



	if (of_get_property(np, "fsl,dte-mode", NULL))

		sport->dte_mode = 1;



	sport->devdata = of_id->data;



	return 0;