linux-kernel - [PATCH 08/15] of_serial: support for UARTs on I/O ports

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Date:	Fri, 22 May 2015 16:51:07 +0100
From:	Paul Burton <paul.burton@...tec.com>
To:	<linux-mips@...ux-mips.org>
CC:	<devicetree@...r.kernel.org>, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"Paul Burton" <paul.burton@...tec.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, <linux-kernel@...r.kernel.org>,
	<linux-serial@...r.kernel.org>
Subject: [PATCH 08/15] of_serial: support for UARTs on I/O ports

If the address provided for the UART is of an I/O port rather than
a regular memory address, then set the port iotype appropriately and
write the address to iobase rather than mapbase.

Signed-off-by: Paul Burton <paul.burton@...tec.com>
---

 drivers/tty/serial/of_serial.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
index 137381e..ccff9ba 100644
--- a/drivers/tty/serial/of_serial.c
+++ b/drivers/tty/serial/of_serial.c
@@ -110,7 +110,12 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 
 	port->irq = irq_of_parse_and_map(np, 0);
 	port->iotype = UPIO_MEM;
-	if (of_property_read_u32(np, "reg-io-width", &prop) == 0) {
+
+	if (resource.flags & IORESOURCE_IO) {
+		port->iotype = UPIO_PORT;
+		port->iobase = port->mapbase;
+		port->mapbase = 0;
+	} else if (of_property_read_u32(np, "reg-io-width", &prop) == 0) {
 		switch (prop) {
 		case 1:
 			port->iotype = UPIO_MEM;
-- 
2.4.1

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