2022-05-16 21:40:32 +00:00
|
|
|
From da6e94edb85fc948357b4163b6ddaa9e75f5e0df Mon Sep 17 00:00:00 2001
|
|
|
|
|
From: Phil Elwell <phil@raspberrypi.org>
|
|
|
|
|
Date: Tue, 23 Feb 2016 17:26:48 +0000
|
|
|
|
|
Subject: [PATCH] amba_pl011: Don't use DT aliases for numbering
|
|
|
|
|
|
|
|
|
|
The pl011 driver looks for DT aliases of the form "serial<n>",
|
|
|
|
|
and if found uses <n> as the device ID. This can cause
|
|
|
|
|
/dev/ttyAMA0 to become /dev/ttyAMA1, which is confusing if the
|
|
|
|
|
other serial port is provided by the 8250 driver which doesn't
|
|
|
|
|
use the same logic.
|
|
|
|
|
---
|
|
|
|
|
drivers/tty/serial/amba-pl011.c | 5 +++++
|
|
|
|
|
1 file changed, 5 insertions(+)
|
|
|
|
|
|
|
|
|
|
--- a/drivers/tty/serial/amba-pl011.c
|
|
|
|
|
+++ b/drivers/tty/serial/amba-pl011.c
|
2022-12-31 15:29:53 +00:00
|
|
|
@@ -2756,7 +2756,12 @@ static int pl011_setup_port(struct devic
|
2022-05-16 21:40:32 +00:00
|
|
|
if (IS_ERR(base))
|
|
|
|
|
return PTR_ERR(base);
|
|
|
|
|
|
|
|
|
|
+ /* Don't use DT serial<n> aliases - it causes the device to
|
|
|
|
|
+ be renumbered to ttyAMA1 if it is the second serial port in the
|
|
|
|
|
+ system, even though the other one is ttyS0. The 8250 driver
|
|
|
|
|
+ doesn't use this logic, so always remains ttyS0.
|
|
|
|
|
index = pl011_probe_dt_alias(index, dev);
|
|
|
|
|
+ */
|
|
|
|
|
|
|
|
|
|
uap->old_cr = 0;
|
|
|
|
|
uap->port.dev = dev;
|
