2019-08-09 17:50:30 +00:00
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From 903fe021059f70162175066f034de618064ca0bb Mon Sep 17 00:00:00 2001
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2019-07-31 16:23:26 +00:00
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Tue, 9 Jul 2019 10:32:40 +0100
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2019-08-09 17:50:30 +00:00
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Subject: [PATCH 698/773] overlays: i2c-gpio: Fix the "bus" parameter
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2019-07-31 16:23:26 +00:00
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The "bus" parameter has two functions - providing unique names for
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multiple instances of the overlay, and allowing the number of the bus
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(i.e. "i2c-<bus>") to be specified. The second function hasn't worked
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as intended because the overlay doesn't include a "reg" property and
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the firmware intentionally won't create a "reg" property if one doesn't
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already exist.
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Allow the bus numbering scheme to work as intended by providing a "reg"
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with a default value that means "the next available one".
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See: https://github.com/raspberrypi/linux/issues/3062
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts | 2 ++
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1 file changed, 2 insertions(+)
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--- a/arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts
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@@ -7,8 +7,10 @@
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fragment@0 {
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target-path = "/";
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+
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__overlay__ {
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i2c_gpio: i2c@0 {
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+ reg = <0xffffffff>;
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compatible = "i2c-gpio";
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gpios = <&gpio 23 0 /* sda */
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&gpio 24 0 /* scl */
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