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, 35 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0925-ARM-dts-Add-UART-skip-init-properties-for-U-boot.patch b/target/linux/bcm27xx/patches-5.4/950-0925-ARM-dts-Add-UART-skip-init-properties-for-U-boot.patch
new file mode 100644
index 0000000000..be6c9dd250
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0925-ARM-dts-Add-UART-skip-init-properties-for-U-boot.patch
@@ -0,0 +1,35 @@
+From 197b4fbd218a0a12573cdfcb011eeb3f00765d96 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.com>
+Date: Fri, 17 Jul 2020 11:20:07 +0100
+Subject: [PATCH] ARM: dts: Add UART skip-init properties for U-boot
+
+U-boot can get stuck trying to initialise UARTs that aren't mapped
+to the pin header. There is no reason for U-boot not to rely on the
+initialisation by the firmware, so tag both UARTs with the u-boot
+magic boolean property "skip-init".
+
+See: https://github.com/raspberrypi/linux/pull/3731
+     https://lists.denx.de/pipermail/u-boot/2017-April/285606.html
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.com>
+---
+ arch/arm/boot/dts/bcm270x-rpi.dtsi | 8 ++++++++
+ 1 file changed, 8 insertions(+)
+
+--- a/arch/arm/boot/dts/bcm270x-rpi.dtsi
++++ b/arch/arm/boot/dts/bcm270x-rpi.dtsi
+@@ -102,6 +102,14 @@
+ 	};
+ };
+ 
++&uart0 {
++	skip-init;
++};
++
++&uart1 {
++	skip-init;
++};
++
+ &txp {
+ 	status = "disabled";
+ };