diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0160-amba_pl011-Don-t-use-DT-aliases-for-numbering.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0160-amba_pl011-Don-t-use-DT-aliases-for-numbering.patch | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0160-amba_pl011-Don-t-use-DT-aliases-for-numbering.patch b/target/linux/brcm2708/patches-4.4/0160-amba_pl011-Don-t-use-DT-aliases-for-numbering.patch new file mode 100644 index 0000000..344fbd9 --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0160-amba_pl011-Don-t-use-DT-aliases-for-numbering.patch @@ -0,0 +1,29 @@ +From 00dba6ec2ac004fc17075febd4504646eb3dc543 Mon Sep 17 00:00:00 2001 +From: Phil Elwell <phil@raspberrypi.org> +Date: Tue, 23 Feb 2016 17:26:48 +0000 +Subject: [PATCH 160/170] 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; |