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authorHuang Shijie <b32955@freescale.com>2013-05-30 14:07:12 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-06-03 14:31:39 -0700
commit20ff2fe60aa86683a68cd369c919ae6a98059c80 (patch)
treedbca4cbe28cfa92153d6459d33babf088db3d2a5
parent2cb5a2fa219897e5d4ccd8831e8d0f3d6e6f0f23 (diff)
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>
-rw-r--r--Documentation/devicetree/bindings/tty/serial/fsl-imx-uart.txt3
-rw-r--r--drivers/tty/serial/imx.c6
2 files changed, 9 insertions, 0 deletions
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;

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