bcm27xx: import latest patches from the RPi foundation

bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0962-ARM-dts-Limit-BT-modem-baud-rate-on-3B.patch b/target/linux/bcm27xx/patches-5.4/950-0962-ARM-dts-Limit-BT-modem-baud-rate-on-3B.patch
new file mode 100644
index 0000000000..f88cc7b397
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0962-ARM-dts-Limit-BT-modem-baud-rate-on-3B.patch
@@ -0,0 +1,28 @@
+From 27f210c863d3349d41e366fb7573e9dcc0708e3d Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.com>
+Date: Fri, 4 Sep 2020 09:04:29 +0100
+Subject: [PATCH] ARM: dts: Limit BT modem baud rate on 3B
+
+The 3B doesn't have the flow control signals connected to the BT modem,
+which limits the maximum usable baud rate to below 1 Mbaud. Use
+921600 as a relatively safe default value, but the krnbt_baudrate
+parameter can still override it.
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.com>
+---
+ arch/arm/boot/dts/bcm2710-rpi-3-b.dts | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+--- a/arch/arm/boot/dts/bcm2710-rpi-3-b.dts
++++ b/arch/arm/boot/dts/bcm2710-rpi-3-b.dts
+@@ -117,6 +117,10 @@
+ 	status = "okay";
+ };
+ 
++&bt {
++	max-speed = <921600>;
++};
++
+ &spi0 {
+ 	pinctrl-names = "default";
+ 	pinctrl-0 = <&spi0_pins &spi0_cs_pins>;