brcm2708: update to latest patches from RPi Foundation

[openwrt/staging/dedeckeh.git] / target / linux / brcm2708 / patches-4.19 / 950-0033-amba_pl011-Don-t-use-DT-aliases-for-numbering.patch

diff --git a/target/linux/brcm2708/patches-4.19/950-0033-amba_pl011-Don-t-use-DT-aliases-for-numbering.patch b/target/linux/brcm2708/patches-4.19/950-0033-amba_pl011-Don-t-use-DT-aliases-for-numbering.patch
new file mode 100644 (file)
index 0000000..1d6fdac
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0033-amba_pl011-Don-t-use-DT-aliases-for-numbering.patch
@@ -0,0 +1,29 @@
+From c048d8c7b1ae0d56d9ee1bca2be8cc9da5a43bba 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
+@@ -2576,7 +2576,12 @@ 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;