target/linux/bcm27xx/patches-5.4/950-0703-overlays-gpio-keys-Avoid-open-drain-warnings.patch

   1 From ae10c15867d9a5b85eefaf11333bd30473af4b2b Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.com>
   3 Date: Sat, 2 May 2020 13:43:06 +0100
   4 Subject: [PATCH] overlays: gpio-keys: Avoid open-drain warnings
   5
   6 The i2c-gpio driver expects to use a GPIO in open-drain mode. Failure
   7 to configure it in that way causes alarming warnings in the kernel log.
   8 The BCM283x and BCM2711 GPIO blocks don't support open-drain mode,
   9 but i2c-gpio works anyway. Silence the warning by declaring that
  10 open-drain mode has been enabled by other means.
  11
  12 See: https://github.com/raspberrypi/firmware/issues/1381
  13
  14 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
  15 ---
  16  arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts | 2 ++
  17  1 file changed, 2 insertions(+)
  18
  19 --- a/arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts
  20 +++ b/arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts
  21 @@ -16,6 +16,8 @@
  22                                          &gpio 24 0 /* scl */
  23                                         >;
  24                                 i2c-gpio,delay-us = <2>;        /* ~100 kHz */
  25 +                               i2c-gpio,sda-open-drain;
  26 +                               i2c-gpio,scl-open-drain;
  27                                 #address-cells = <1>;
  28                                 #size-cells = <0>;
  29                         };