diff options
| author | Fabio Estevam <fabio.estevam@nxp.com> | 2017-01-07 19:29:13 -0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-12 11:51:25 +0100 |
| commit | 7b7e8e8e8fc6a9f1f0372d1ffb271ecfdaf0285a (patch) | |
| tree | 0bd97ad3f037398146ddc49ff995669384e6eb42 /drivers/tty | |
| parent | 3f08087826950de4688da0aea4e4f64f536fcdd6 (diff) | |
serial: imx: Allow passing 'rst-gpios' for rs485 mode
According to Documentation/devicetree/bindings/serial/serial.txt the
generic 'rts-gpios' property can be used to specify the GPIO for RTS
functionality.
Currently it is not possible to use the imx UART port in rs485 mode when
the 'rts-gpios' property is passed in the device tree.
The imx uart driver only checks for the presence of the built-in RTS pin,
via 'uart-has-rtscts' property and disable the rs485 flag if this property
is absent.
So fix this logic by also checking if RTS pin has been passed via GPIO.
Tested on a imx6dl based board.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Tested-by: Clemens Gruber <clemens.gruber@pqgruber.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/imx.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index a70356dad1b7..33fcc84e756b 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -205,6 +205,7 @@ struct imx_port { struct timer_list timer; unsigned int old_status; unsigned int have_rtscts:1; + unsigned int have_rtsgpio:1; unsigned int dte_mode:1; unsigned int irda_inv_rx:1; unsigned int irda_inv_tx:1; @@ -1725,7 +1726,7 @@ static int imx_rs485_config(struct uart_port *port, rs485conf->delay_rts_after_send = 0; /* RTS is required to control the transmitter */ - if (!sport->have_rtscts) + if (!sport->have_rtscts && !sport->have_rtsgpio) rs485conf->flags &= ~SER_RS485_ENABLED; if (rs485conf->flags & SER_RS485_ENABLED) { @@ -2048,6 +2049,9 @@ static int serial_imx_probe_dt(struct imx_port *sport, if (of_get_property(np, "fsl,dte-mode", NULL)) sport->dte_mode = 1; + if (of_get_property(np, "rts-gpios", NULL)) + sport->have_rtsgpio = 1; + return 0; } #else |