From 274eef4797a1a39b9f098cd2a156c2be5b6024a6 Mon Sep 17 00:00:00 2001 From: Phil Elwell Date: Tue, 9 Jul 2019 10:32:40 +0100 Subject: [PATCH 697/782] overlays: i2c-gpio: Fix the "bus" parameter The "bus" parameter has two functions - providing unique names for multiple instances of the overlay, and allowing the number of the bus (i.e. "i2c-") to be specified. The second function hasn't worked as intended because the overlay doesn't include a "reg" property and the firmware intentionally won't create a "reg" property if one doesn't already exist. Allow the bus numbering scheme to work as intended by providing a "reg" with a default value that means "the next available one". See: https://github.com/raspberrypi/linux/issues/3062 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 @@ -7,8 +7,10 @@ fragment@0 { target-path = "/"; + __overlay__ { i2c_gpio: i2c@0 { + reg = <0xffffffff>; compatible = "i2c-gpio"; gpios = <&gpio 23 0 /* sda */ &gpio 24 0 /* scl */