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, 62 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0755-overlays-gpio-shutdown-Add-information-for-Raspberry.patch b/target/linux/bcm27xx/patches-5.4/950-0755-overlays-gpio-shutdown-Add-information-for-Raspberry.patch
new file mode 100644
index 0000000000..5bb6ee23ab
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0755-overlays-gpio-shutdown-Add-information-for-Raspberry.patch
@@ -0,0 +1,62 @@
+From 5f9fcc99c517a517e8d74ce001fc5bc2648f0e59 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Thu, 30 Apr 2020 19:41:10 +0200
+Subject: [PATCH] overlays: gpio-shutdown: Add information for
+ Raspberry Pi 1 Model B rev 1
+
+Raspberry Pi 1 Model B rev 1 uses GPIO1 for power-up instead of GPIO3.
+---
+ arch/arm/boot/dts/overlays/README                    | 10 ++++++++--
+ arch/arm/boot/dts/overlays/gpio-shutdown-overlay.dts |  6 ++++--
+ 2 files changed, 12 insertions(+), 4 deletions(-)
+
+--- a/arch/arm/boot/dts/overlays/README
++++ b/arch/arm/boot/dts/overlays/README
+@@ -883,9 +883,14 @@ Info:   Initiates a shutdown when GPIO p
+         can be powered up again by driving GPIO3 low. The default
+         configuration uses GPIO3 with a pullup, so if you connect a
+         button between GPIO3 and GND (pin 5 and 6 on the 40-pin header),
+-        you get a shutdown and power-up button.
++        you get a shutdown and power-up button. Please note that
++        Raspberry Pi 1 Model B rev 1 uses GPIO1 instead of GPIO3.
+ Load:   dtoverlay=gpio-shutdown,<param>=<val>
+ Params: gpio_pin                GPIO pin to trigger on (default 3)
++                                For Raspberry Pi 1 Model B rev 1 set this
++                                explicitly to value 1, e.g.:
++
++                                    dtoverlay=gpio-shutdown,gpio_pin=1
+ 
+         active_low              When this is 1 (active low), a falling
+                                 edge generates a key down event and a
+@@ -897,7 +902,8 @@ Params: gpio_pin                GPIO pin
+                                 Default is "up".
+ 
+                                 Note that the default pin (GPIO3) has an
+-                                external pullup.
++                                external pullup. Same applies for GPIO1
++                                on Raspberry Pi 1 Model B rev 1.
+ 
+         debounce                Specify the debounce interval in milliseconds
+                                 (default 100)
+--- a/arch/arm/boot/dts/overlays/gpio-shutdown-overlay.dts
++++ b/arch/arm/boot/dts/overlays/gpio-shutdown-overlay.dts
+@@ -4,7 +4,9 @@
+ 
+ // This overlay sets up an input device that generates KEY_POWER events
+ // when a given GPIO pin changes. It defaults to using GPIO3, which can
+-// also be used to wake up (start) the Rpi again after shutdown. Since
++// also be used to wake up (start) the Rpi again after shutdown.
++// Raspberry Pi 1 Model B rev 1 can be wake up only by GPIO1 pin, so for
++// these boards change default GPIO pin to 1 via gpio_pin parameter. Since
+ // wakeup is active-low, this defaults to active-low with a pullup
+ // enabled, but all of this can be changed using overlay parameters (but
+ // note that GPIO3 has an external pullup on at least some boards).
+@@ -71,7 +73,7 @@
+ 
+ 		// Allow changing the internal pullup/down state. 0 = none, 1 = pulldown, 2 = pullup
+ 		// Note that GPIO3 and GPIO2 are the I2c pins and have an external pullup (at least
+-                // on some boards).
++		// on some boards). Same applies for GPIO1 on Raspberry Pi 1 Model B rev 1.
+ 		gpio_pull = <&pin_state>,"brcm,pull:0";
+ 
+ 		// Allow setting the active_low flag. 0 = active high, 1 = active low