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From d562b2187263b40aacc1a50d3f25db2cf28696d6 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Tue, 9 Jul 2019 10:32:40 +0100
Subject: [PATCH] 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-<bus>") 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 <phil@raspberrypi.org>
---
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 */
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