git.openwrt.org Git - openwrt/staging/ldir.git/blob

   1 From 911dedf3f51adf8cfd6554af1c89c922c4453889 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Mon, 24 Apr 2023 16:27:57 +0100
   4 Subject: [PATCH] dtoverlays: Add overrides for alternate i2c buses to
   5  i2c-mux
   6
   7 The i2c-mux overlay was fixed to i2c-1. Add overrides to allow
   8 it to be assigned to alternate buses.
   9
  10 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  11 ---
  12  arch/arm/boot/dts/overlays/README             | 16 ++++++++
  13  .../arm/boot/dts/overlays/i2c-mux-overlay.dts | 40 +++++++++++++++++--
  14  2 files changed, 53 insertions(+), 3 deletions(-)
  15
  16 --- a/arch/arm/boot/dts/overlays/README
  17 +++ b/arch/arm/boot/dts/overlays/README
  18 @@ -1833,6 +1833,22 @@ Params: pca9542                 Select t
  19
  20          addr                    Change I2C address of the device (default 0x70)
  21
  22 +        i2c0                    Choose the I2C0 bus on GPIOs 0&1
  23 +
  24 +        i2c_csi_dsi             Choose the I2C0 bus on GPIOs 44&45
  25 +
  26 +        i2c3                    Choose the I2C3 bus (configure with the i2c3
  27 +                                overlay - BCM2711 only)
  28 +
  29 +        i2c4                    Choose the I2C3 bus (configure with the i2c3
  30 +                                overlay - BCM2711 only)
  31 +
  32 +        i2c5                    Choose the I2C5 bus (configure with the i2c4
  33 +                                overlay - BCM2711 only)
  34 +
  35 +        i2c6                    Choose the I2C6 bus (configure with the i2c6
  36 +                                overlay - BCM2711 only)
  37 +
  38
  39  [ The i2c-mux-pca9548a overlay has been deleted. See i2c-mux. ]
  40
  41 --- a/arch/arm/boot/dts/overlays/i2c-mux-overlay.dts
  42 +++ b/arch/arm/boot/dts/overlays/i2c-mux-overlay.dts
  43 @@ -7,7 +7,7 @@
  44         compatible = "brcm,bcm2835";
  45
  46         fragment@0 {
  47 -               target = <&i2c_arm>;
  48 +               target = <&i2cbus>;
  49                 __dormant__ {
  50                         #address-cells = <1>;
  51                         #size-cells = <0>;
  52 @@ -34,7 +34,7 @@
  53         };
  54
  55         fragment@1 {
  56 -               target = <&i2c_arm>;
  57 +               target = <&i2cbus>;
  58                 __dormant__ {
  59                         #address-cells = <1>;
  60                         #size-cells = <0>;
  61 @@ -71,7 +71,7 @@
  62         };
  63
  64         fragment@2 {
  65 -               target = <&i2c_arm>;
  66 +               target = <&i2cbus>;
  67                 __dormant__ {
  68                         #address-cells = <1>;
  69                         #size-cells = <0>;
  70 @@ -127,6 +127,27 @@
  71                 };
  72         };
  73
  74 +       frag100: fragment@100 {
  75 +               target = <&i2c_arm>;
  76 +               i2cbus: __overlay__ {
  77 +                       status = "okay";
  78 +               };
  79 +       };
  80 +
  81 +       fragment@101 {
  82 +               target = <&i2c0if>;
  83 +               __dormant__ {
  84 +                       status = "okay";
  85 +               };
  86 +       };
  87 +
  88 +       fragment@102 {
  89 +               target = <&i2c0mux>;
  90 +               __dormant__ {
  91 +                       status = "okay";
  92 +               };
  93 +       };
  94 +
  95         __overrides__ {
  96                 pca9542 = <0>, "+0";
  97                 pca9545 = <0>, "+1";
  98 @@ -135,5 +156,18 @@
  99                 addr =  <&pca9542>,"reg:0",
 100                         <&pca9545>,"reg:0",
 101                         <&pca9548>,"reg:0";
 102 +
 103 +               i2c0 = <&frag100>, "target:0=",<&i2c0>,
 104 +                             <0>,"+101+102";
 105 +               i2c_csi_dsi = <&frag100>, "target:0=",<&i2c_csi_dsi>,
 106 +                             <0>,"+101+102";
 107 +               i2c3 = <&frag100>, "target?=0",
 108 +                      <&frag100>, "target-path=i2c3";
 109 +               i2c4 = <&frag100>, "target?=0",
 110 +                      <&frag100>, "target-path=i2c4";
 111 +               i2c5 = <&frag100>, "target?=0",
 112 +                      <&frag100>, "target-path=i2c5";
 113 +               i2c6 = <&frag100>, "target?=0",
 114 +                      <&frag100>, "target-path=i2c6";
 115         };
 116  };