target/linux/brcm2708/patches-4.4/0213-Add-configs-and-overlay-for-PCA9548-I2C-mux.patch

   1 From 031f69058a890ac8df5834cde9e0f6301b9a75d3 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <6by9@users.noreply.github.com>
   3 Date: Thu, 17 Mar 2016 18:16:16 +0000
   4 Subject: [PATCH 213/304] Add configs and overlay for PCA9548 I2C mux
   5
   6 Adds kernel configs for I2C muxes and a dt overlay for PCA9548
   7 that adds the 8 muxed I2C buses and mux device.
   8 ---
   9  arch/arm/boot/dts/overlays/Makefile                |  1 +
  10  arch/arm/boot/dts/overlays/README                  |  6 ++
  11  .../boot/dts/overlays/i2c-mux-pca9548a-overlay.dts | 67 ++++++++++++++++++++++
  12  arch/arm/configs/bcm2709_defconfig                 |  2 +
  13  arch/arm/configs/bcmrpi_defconfig                  |  2 +
  14  5 files changed, 78 insertions(+)
  15  create mode 100644 arch/arm/boot/dts/overlays/i2c-mux-pca9548a-overlay.dts
  16
  17 --- a/arch/arm/boot/dts/overlays/Makefile
  18 +++ b/arch/arm/boot/dts/overlays/Makefile
  19 @@ -29,6 +29,7 @@ dtbo-$(RPI_DT_OVERLAYS) += hy28a.dtbo
  20  dtbo-$(RPI_DT_OVERLAYS) += hy28b.dtbo
  21  dtbo-$(RPI_DT_OVERLAYS) += i2c-rtc.dtbo
  22  dtbo-$(RPI_DT_OVERLAYS) += i2c-gpio.dtbo
  23 +dtbo-$(RPI_DT_OVERLAYS) += i2c-mux-pca9548a.dtbo
  24  dtbo-$(RPI_DT_OVERLAYS) += i2c0-bcm2708.dtbo
  25  dtbo-$(RPI_DT_OVERLAYS) += i2c1-bcm2708.dtbo
  26  dtbo-$(RPI_DT_OVERLAYS) += i2s-mmap.dtbo
  27 --- a/arch/arm/boot/dts/overlays/README
  28 +++ b/arch/arm/boot/dts/overlays/README
  29 @@ -360,6 +360,12 @@ Params: i2c_gpio_sda            GPIO use
  30                                  (default "2" = ~100kHz)
  31
  32
  33 +Name:   i2c-mux-pca9548a
  34 +Info:   Adds support for an NXP PCA9548A I2C multiplexer on i2c_arm
  35 +Load:   dtoverlay=i2c-mux-pca9548a,<param>=<val>
  36 +Params: addr                    I2C address of PCA9548A (default 0x70)
  37 +
  38 +
  39  Name:   i2c-rtc
  40  Info:   Adds support for a number of I2C Real Time Clock devices
  41  Load:   dtoverlay=i2c-rtc,<param>=<val>
  42 --- /dev/null
  43 +++ b/arch/arm/boot/dts/overlays/i2c-mux-pca9548a-overlay.dts
  44 @@ -0,0 +1,67 @@
  45 +// Definitions for NXP PCA9548A I2C mux on ARM I2C bus.
  46 +/dts-v1/;
  47 +/plugin/;
  48 +
  49 +/{
  50 +       compatible = "brcm,bcm2708";
  51 +
  52 +       fragment@0 {
  53 +               target = <&i2c_arm>;
  54 +               __overlay__ {
  55 +                       #address-cells = <1>;
  56 +                       #size-cells = <0>;
  57 +                       status = "okay";
  58 +
  59 +                       i2cmux: mux@70 {
  60 +                               compatible = "nxp,pca9548";
  61 +                               reg = <0x70>;
  62 +                               #address-cells = <1>;
  63 +                               #size-cells = <0>;
  64 +
  65 +                               i2c@0 {
  66 +                                       #address-cells = <1>;
  67 +                                       #size-cells = <0>;
  68 +                                       reg = <0>;
  69 +                               };
  70 +                               i2c@1 {
  71 +                                       #address-cells = <1>;
  72 +                                       #size-cells = <0>;
  73 +                                       reg = <1>;
  74 +                               };
  75 +                               i2c@2 {
  76 +                                       #address-cells = <1>;
  77 +                                       #size-cells = <0>;
  78 +                                       reg = <2>;
  79 +                               };
  80 +                               i2c@3 {
  81 +                                       #address-cells = <1>;
  82 +                                       #size-cells = <0>;
  83 +                                       reg = <3>;
  84 +                               };
  85 +                               i2c@4 {
  86 +                                       #address-cells = <1>;
  87 +                                       #size-cells = <0>;
  88 +                                       reg = <4>;
  89 +                               };
  90 +                               i2c@5 {
  91 +                                       #address-cells = <1>;
  92 +                                       #size-cells = <0>;
  93 +                                       reg = <5>;
  94 +                               };
  95 +                               i2c@6 {
  96 +                                       #address-cells = <1>;
  97 +                                       #size-cells = <0>;
  98 +                                       reg = <6>;
  99 +                               };
 100 +                               i2c@7 {
 101 +                                       #address-cells = <1>;
 102 +                                       #size-cells = <0>;
 103 +                                       reg = <7>;
 104 +                               };
 105 +                       };
 106 +               };
 107 +       };
 108 +       __overrides__ {
 109 +               addr = <&i2cmux>,"reg:0";
 110 +       };
 111 +};
 112 --- a/arch/arm/configs/bcm2709_defconfig
 113 +++ b/arch/arm/configs/bcm2709_defconfig
 114 @@ -600,6 +600,8 @@ CONFIG_I2C=y
 115  CONFIG_I2C_CHARDEV=m
 116  CONFIG_I2C_BCM2708=m
 117  CONFIG_I2C_GPIO=m
 118 +CONFIG_I2C_MUX=m
 119 +CONFIG_I2C_MUX_PCA954x=m
 120  CONFIG_SPI=y
 121  CONFIG_SPI_BCM2835=m
 122  CONFIG_SPI_BCM2835AUX=m
 123 --- a/arch/arm/configs/bcmrpi_defconfig
 124 +++ b/arch/arm/configs/bcmrpi_defconfig
 125 @@ -593,6 +593,8 @@ CONFIG_I2C=y
 126  CONFIG_I2C_CHARDEV=m
 127  CONFIG_I2C_BCM2708=m
 128  CONFIG_I2C_GPIO=m
 129 +CONFIG_I2C_MUX=m
 130 +CONFIG_I2C_MUX_PCA954x=m
 131  CONFIG_SPI=y
 132  CONFIG_SPI_BCM2835=m
 133  CONFIG_SPI_BCM2835AUX=m