overlays: Add gpio-no-bank0-irq overlay

See: #2590

Signed-off-by: Phil Elwell <[email protected]>

Author: Phil Elwell

arch/arm/boot/dts/overlays/Makefile

@@ -39,6 +39,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	gpio-ir.dtbo \
 	gpio-ir-tx.dtbo \
 	gpio-key.dtbo \
+	gpio-no-bank0-irq.dtbo \
 	gpio-no-irq.dtbo \
 	gpio-poweroff.dtbo \
 	gpio-shutdown.dtbo \

arch/arm/boot/dts/overlays/README

@@ -619,6 +619,15 @@ Params: gpio                    GPIO pin to trigger on (default 3)
         keycode                 Set the key code for the button
 
 
+Name:   gpio-no-bank0-irq
+Info:   Use this overlay to disable GPIO interrupts for GPIOs in bank 0 (0-27),
+        which can be useful for UIO drivers.
+        N.B. Using this overlay will trigger a kernel WARN during booting, but
+        this can safely be ignored - the system should work as expected.
+Load:   dtoverlay=gpio-no-bank0-irq
+Params: <None>
+
+
 Name:   gpio-no-irq
 Info:   Use this overlay to disable all GPIO interrupts, which can be useful
         for user-space GPIO edge detection systems.

arch/arm/boot/dts/overlays/gpio-no-bank0-irq-overlay.dts

@@ -0,0 +1,14 @@
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2835";
+
+	fragment@0 {
+		// Configure the gpio pin controller
+		target = <&gpio>;
+		__overlay__ {
+			    interrupts = <255 255>, <2 18>;
+		};
+	};
+};