linux-kernel - [PATCH 3.12 091/142] serial: of-serial: Remove device

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Message-Id: <b2ca4db9080145428a76c97e740bb0f857f27e2f.1431761807.git.jslaby@suse.cz>
Date:	Sat, 16 May 2015 09:37:31 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Michal Simek <michal.simek@...inx.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 091/142] serial: of-serial: Remove device_type = "serial" registration

From: Michal Simek <michal.simek@...inx.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 6befa9d883385c580369a2cc9e53fbf329771f6d upstream.

Do not probe all serial drivers by of_serial.c which are using
device_type = "serial"; property. Only drivers which have valid
compatible strings listed in the driver should be probed.

When PORT_UNKNOWN is setup probe will fail anyway.

Arnd quotation about driver historical background:
"when I wrote that driver initially, the idea was that it would
get used as a stub to hook up all other serial drivers but after
that, the common code learned to create platform devices from DT"

This patch fix the problem with on the system with xilinx_uartps and
16550a where of_serial failed to register for xilinx_uartps and because
of irq_dispose_mapping() removed irq_desc. Then when xilinx_uartps was asking
for irq with request_irq() EINVAL is returned.

Signed-off-by: Michal Simek <michal.simek@...inx.com>
Acked-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/tty/serial/of_serial.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
index 2caf9c6f6149..d666517288aa 100644
--- a/drivers/tty/serial/of_serial.c
+++ b/drivers/tty/serial/of_serial.c
@@ -262,7 +262,6 @@ static struct of_device_id of_platform_serial_table[] = {
 	{ .compatible = "ibm,qpace-nwp-serial",
 		.data = (void *)PORT_NWPSERIAL, },
 #endif
-	{ .type = "serial",         .data = (void *)PORT_UNKNOWN, },
 	{ /* end of list */ },
 };
 
-- 
2.3.7

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