From: Huang Shijie <b32955@freescale.com>
Date: Thu, 30 May 2013 06:07:12 +0000 (+0800)
Subject: serial: imx: add support for DTE mode
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=20ff2fe60aa86683a68cd369c919ae6a98059c80;p=linux-beck.git

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>
---

diff --git a/Documentation/devicetree/bindings/tty/serial/fsl-imx-uart.txt b/Documentation/devicetree/bindings/tty/serial/fsl-imx-uart.txt
index b462d0c54823..c662eb36be29 100644
--- a/Documentation/devicetree/bindings/tty/serial/fsl-imx-uart.txt
+++ b/Documentation/devicetree/bindings/tty/serial/fsl-imx-uart.txt
@@ -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;
 };
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 72bc1dbcd055..381a2d79593c 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -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;