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[v4,5/9] serial: fsl_lpuart: Use common rs485 device tree parsing function

Message ID 20170718105948.21986-6-u.kleine-koenig@pengutronix.de
State New
Headers show

Commit Message

Uwe Kleine-König July 18, 2017, 10:59 a.m. UTC 
From: Sascha Hauer <s.hauer@pengutronix.de>

We just got a common helper for parsing the rs485 specific
device tree properties. Use it and drop the open coded parser.

As a side effect this adds support for parsing rs485-rts-delay and
rs485-rx-during-tx. As the driver doesn't support this though, probing
fails if these are defined.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/tty/serial/fsl_lpuart.c | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

Comments

Greg KH July 30, 2017, 2:50 p.m. UTC | #1 
On Tue, Jul 18, 2017 at 12:59:44PM +0200, Uwe Kleine-König wrote:
> From: Sascha Hauer <s.hauer@pengutronix.de>
> 
> We just got a common helper for parsing the rs485 specific
> device tree properties. Use it and drop the open coded parser.
> 
> As a side effect this adds support for parsing rs485-rts-delay and
> rs485-rx-during-tx. As the driver doesn't support this though, probing
> fails if these are defined.
> 
> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> ---
>  drivers/tty/serial/fsl_lpuart.c | 24 ++++++++++++++++++------
>  1 file changed, 18 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
> index 4becfbf35c4c..cac81b143abe 100644
> --- a/drivers/tty/serial/fsl_lpuart.c
> +++ b/drivers/tty/serial/fsl_lpuart.c
> @@ -2161,6 +2161,24 @@ static int lpuart_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> +	of_get_rs485_mode(np, &sport->port.rs485);

error checking?

Elsewhere in this series as well.

Also, why did you not cc: me on this series so I am sure to see it?

thanks,

greg k-h
diff mbox

Patch

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 4becfbf35c4c..cac81b143abe 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -2161,6 +2161,24 @@  static int lpuart_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	of_get_rs485_mode(np, &sport->port.rs485);
+
+	if (sport->port.rs485.flags & SER_RS485_RX_DURING_TX) {
+		dev_err(&pdev->dev, "driver doesn't support RX during TX\n");
+		return -ENOSYS;
+	}
+
+	if (sport->port.rs485.delay_rts_before_send ||
+	    sport->port.rs485.delay_rts_after_send) {
+		dev_err(&pdev->dev, "driver doesn't support RTS delays\n");
+		return -ENOSYS;
+	}
+
+	if (sport->port.rs485.flags & SER_RS485_ENABLED) {
+		sport->port.rs485.flags |= SER_RS485_RTS_ON_SEND;
+		writeb(UARTMODEM_TXRTSE, sport->port.membase + UARTMODEM);
+	}
+
 	sport->dma_tx_chan = dma_request_slave_channel(sport->port.dev, "tx");
 	if (!sport->dma_tx_chan)
 		dev_info(sport->port.dev, "DMA tx channel request failed, "
@@ -2171,12 +2189,6 @@  static int lpuart_probe(struct platform_device *pdev)
 		dev_info(sport->port.dev, "DMA rx channel request failed, "
 				"operating without rx DMA\n");
 
-	if (of_property_read_bool(np, "linux,rs485-enabled-at-boot-time")) {
-		sport->port.rs485.flags |= SER_RS485_ENABLED;
-		sport->port.rs485.flags |= SER_RS485_RTS_ON_SEND;
-		writeb(UARTMODEM_TXRTSE, sport->port.membase + UARTMODEM);
-	}
-
 	return 0;
 }