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: Huang Shijie <b32955@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Huang Shijie 2013-05-30 14:07:12 +08:00 committed by Greg Kroah-Hartman
parent 2cb5a2fa21
commit 20ff2fe60a
2 changed files with 9 additions and 0 deletions

View File

@ -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;
};

View File

@ -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;