target/linux/bcm27xx/patches-6.1/950-1029-overlays-mcp23017-allow-specification-of-the-i2c-bus.patch

   1 From 27f0e0e195568c06f21ce380f0736bdd219baf3c Mon Sep 17 00:00:00 2001
   2 From: Janis Streib <janis+github@dogcraft.de>
   3 Date: Sun, 15 Oct 2023 21:08:40 +0200
   4 Subject: [PATCH] overlays: mcp23017: allow specification of the i2c bus
   5
   6 Analogous to i2c-rtc-overlay.dts
   7
   8 See: https://github.com/raspberrypi/linux/pull/5650
   9 ---
  10  arch/arm/boot/dts/overlays/README             | 10 ++++++
  11  .../boot/dts/overlays/mcp23017-overlay.dts    | 36 +++++++++++++++++--
  12  2 files changed, 44 insertions(+), 2 deletions(-)
  13
  14 --- a/arch/arm/boot/dts/overlays/README
  15 +++ b/arch/arm/boot/dts/overlays/README
  16 @@ -2810,6 +2810,16 @@ Params: gpiopin                 Gpio pin
  17
  18          mcp23008                Configure an MCP23008 instead.
  19          noints                  Disable the interrupt GPIO line.
  20 +        i2c0                    Choose the I2C0 bus on GPIOs 0&1
  21 +        i2c_csi_dsi             Choose the I2C0 bus on GPIOs 44&45
  22 +        i2c3                    Choose the I2C3 bus (configure with the i2c3
  23 +                                overlay - BCM2711 only)
  24 +        i2c4                    Choose the I2C4 bus (configure with the i2c4
  25 +                                overlay - BCM2711 only)
  26 +        i2c5                    Choose the I2C5 bus (configure with the i2c5
  27 +                                overlay - BCM2711 only)
  28 +        i2c6                    Choose the I2C6 bus (configure with the i2c6
  29 +                                overlay - BCM2711 only)
  30
  31
  32  Name:   mcp23s17
  33 --- a/arch/arm/boot/dts/overlays/mcp23017-overlay.dts
  34 +++ b/arch/arm/boot/dts/overlays/mcp23017-overlay.dts
  35 @@ -7,7 +7,7 @@
  36         compatible = "brcm,bcm2835";
  37
  38         fragment@0 {
  39 -               target = <&i2c1>;
  40 +               target = <&i2cbus>;
  41                 __overlay__ {
  42                         status = "okay";
  43                 };
  44 @@ -24,7 +24,7 @@
  45         };
  46
  47         fragment@2 {
  48 -               target = <&i2c1>;
  49 +               target = <&i2cbus>;
  50                 __overlay__ {
  51                         #address-cells = <1>;
  52                         #size-cells = <0>;
  53 @@ -58,12 +58,44 @@
  54                 };
  55         };
  56
  57 +       frag100: fragment@100 {
  58 +               target = <&i2c1>;
  59 +               i2cbus: __overlay__ {
  60 +                       status = "okay";
  61 +               };
  62 +       };
  63 +
  64 +       fragment@101 {
  65 +               target = <&i2c0if>;
  66 +               __dormant__ {
  67 +                       status = "okay";
  68 +               };
  69 +       };
  70 +
  71 +       fragment@102 {
  72 +               target = <&i2c0mux>;
  73 +               __dormant__ {
  74 +                       status = "okay";
  75 +               };
  76 +       };
  77 +
  78         __overrides__ {
  79                 gpiopin = <&mcp23017_pins>,"brcm,pins:0",
  80                                 <&mcp23017_irq>,"interrupts:0";
  81                 addr = <&mcp23017>,"reg:0", <&mcp23017_pins>,"reg:0";
  82                 mcp23008 = <0>,"=3";
  83                 noints = <0>,"!1!4";
  84 +               i2c0 = <&frag100>, "target:0=",<&i2c0>;
  85 +               i2c_csi_dsi = <&frag100>, "target:0=",<&i2c_csi_dsi>,
  86 +                             <0>,"+101+102";
  87 +               i2c3 = <&frag100>, "target?=0",
  88 +                      <&frag100>, "target-path=i2c3";
  89 +               i2c4 = <&frag100>, "target?=0",
  90 +                      <&frag100>, "target-path=i2c4";
  91 +               i2c5 = <&frag100>, "target?=0",
  92 +                      <&frag100>, "target-path=i2c5";
  93 +               i2c6 = <&frag100>, "target?=0",
  94 +                      <&frag100>, "target-path=i2c6";
  95         };
  96  };
  97