From ae10c15867d9a5b85eefaf11333bd30473af4b2b Mon Sep 17 00:00:00 2001 From: Phil Elwell 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 --- 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>; };