target/linux/brcm2708/patches-4.19/950-0697-overlays-i2c-gpio-Fix-the-bus-parameter.patch

   1 From d562b2187263b40aacc1a50d3f25db2cf28696d6 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Tue, 9 Jul 2019 10:32:40 +0100
   4 Subject: [PATCH 697/806] overlays: i2c-gpio: Fix the "bus" parameter
   5
   6 The "bus" parameter has two functions - providing unique names for
   7 multiple instances of the overlay, and allowing the number of the bus
   8 (i.e. "i2c-<bus>") to be specified. The second function hasn't worked
   9 as intended because the overlay doesn't include a "reg" property and
  10 the firmware intentionally won't create a "reg" property if one doesn't
  11 already exist.
  12
  13 Allow the bus numbering scheme to work as intended by providing a "reg"
  14 with a default value that means "the next available one".
  15
  16 See: https://github.com/raspberrypi/linux/issues/3062
  17
  18 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  19 ---
  20  arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts | 2 ++
  21  1 file changed, 2 insertions(+)
  22
  23 --- a/arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts
  24 +++ b/arch/arm/boot/dts/overlays/i2c-gpio-overlay.dts
  25 @@ -7,8 +7,10 @@
  26
  27         fragment@0 {
  28                 target-path = "/";
  29 +
  30                 __overlay__ {
  31                         i2c_gpio: i2c@0 {
  32 +                               reg = <0xffffffff>;
  33                                 compatible = "i2c-gpio";
  34                                 gpios = <&gpio 23 0 /* sda */
  35                                          &gpio 24 0 /* scl */