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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>;
};
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