linux-kernel - [PATCH 2/2] serial: bfin-sport-uart: Request CTS GPIO PIN when the sport emulated serial device starts up.

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Date:	Tue, 6 Dec 2011 15:16:34 +0800
From:	Sonic Zhang <sonic.adi@...il.com>
To:	Greg Kroah-Hartman <gregkh@...e.de>, <linux-serial@...r.kernel.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	<uclinux-dist-devel@...ckfin.uclinux.org>,
	Sonic Zhang <sonic.zhang@...log.com>
Subject: [PATCH 2/2] serial: bfin-sport-uart: Request CTS GPIO PIN when the sport emulated serial device starts up.

From: Sonic Zhang <sonic.zhang@...log.com>

This patch is similar to that for bfin-uart hardware flow control.
Sport emulated serial device may be probed earlier before GPIOLIB is initialized.
Requesting and configuring CTS GPIO PIN fails in that early stage.

Signed-off-by: Sonic Zhang <sonic.zhang@...log.com>
---
 drivers/tty/serial/bfin_sport_uart.c |   18 +++++++++---------
 1 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/tty/serial/bfin_sport_uart.c b/drivers/tty/serial/bfin_sport_uart.c
index ee101c0..f650526 100644
--- a/drivers/tty/serial/bfin_sport_uart.c
+++ b/drivers/tty/serial/bfin_sport_uart.c
@@ -299,8 +299,13 @@ static int sport_startup(struct uart_port *port)
 			dev_info(port->dev, "Unable to attach BlackFin UART over SPORT CTS interrupt. So, disable it.\n");
 		}
 	}
-	if (up->rts_pin >= 0)
-		gpio_direction_output(up->rts_pin, 0);
+	if (up->rts_pin >= 0) {
+		if (gpio_request(up->rts_pin, DRV_NAME)) {
+			dev_info(port->dev, "fail to request RTS PIN at GPIO_%d\n", up->rts_pin);
+			up->rts_pin = -1;
+		} else
+			gpio_direction_output(up->rts_pin, 0);
+	}
 #endif
 
 	return 0;
@@ -445,6 +450,8 @@ static void sport_shutdown(struct uart_port *port)
 #ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
 	if (up->cts_pin >= 0)
 		free_irq(gpio_to_irq(up->cts_pin), up);
+	if (up->rts_pin >= 0)
+		gpio_free(up->rts_pin);
 #endif
 }
 
@@ -811,9 +818,6 @@ static int __devinit sport_uart_probe(struct platform_device *pdev)
 			sport->rts_pin = -1;
 		else
 			sport->rts_pin = res->start;
-
-		if (sport->rts_pin >= 0)
-			gpio_request(sport->rts_pin, DRV_NAME);
 #endif
 	}
 
@@ -853,10 +857,6 @@ static int __devexit sport_uart_remove(struct platform_device *pdev)
 
 	if (sport) {
 		uart_remove_one_port(&sport_uart_reg, &sport->port);
-#ifdef CONFIG_SERIAL_BFIN_CTSRTS
-		if (sport->rts_pin >= 0)
-			gpio_free(sport->rts_pin);
-#endif
 		iounmap(sport->port.membase);
 		peripheral_free_list(
 			(unsigned short *)pdev->dev.platform_data);
-- 
1.7.0.4


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