bcm27xx: update patches from RPi foundation

bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2
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, 29 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0705-overlays-gpio-keys-Avoid-open-drain-warnings.patch b/target/linux/bcm27xx/patches-5.4/950-0705-overlays-gpio-keys-Avoid-open-drain-warnings.patch
new file mode 100644
index 0000000000..579b3b61b6
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0705-overlays-gpio-keys-Avoid-open-drain-warnings.patch
@@ -0,0 +1,29 @@
+From ae10c15867d9a5b85eefaf11333bd30473af4b2b Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.com>
+Date: Sat, 2 May 2020 13:43:06 +0100
+Subject: [PATCH] overlays: gpio-keys: Avoid open-drain warnings
+
+The i2c-gpio driver expects to use a GPIO in open-drain mode. Failure
+to configure it in that way causes alarming warnings in the kernel log.
+The BCM283x and BCM2711 GPIO blocks don't support open-drain mode,
+but i2c-gpio works anyway. Silence the warning by declaring that
+open-drain mode has been enabled by other means.
+
+See: https://github.com/raspberrypi/firmware/issues/1381
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.com>
+---
+ arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts
++++ b/arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts
+@@ -16,6 +16,8 @@
+ 					 &gpio 24 0 /* scl */
+ 					>;
+ 				i2c-gpio,delay-us = <2>;        /* ~100 kHz */
++				i2c-gpio,sda-open-drain;
++				i2c-gpio,scl-open-drain;
+ 				#address-cells = <1>;
+ 				#size-cells = <0>;
+ 			};