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- From 39f58f568f34295be6c0b9a2f6f2e502b9305c01 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
- @@ -2313,7 +2313,12 @@ static int pl011_setup_port(struct devic
- 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;
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