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: raspberrypi/firmware#1381 Signed-off-by: Phil Elwell <[email protected]>
raspberrypi · Jul 13, 2020 · 219a1ce · 219a1ce
1 parent 354df8e
commit 219a1ce
Showing 1 changed file with 2 additions and 0 deletions.
diff --git 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>;
 			};