target/linux/brcm2708/patches-4.19/950-0369-Maxim-MAX98357A-I2S-DAC-overlay-2935.patch

   1 From 5962d99b5efed4297ed5c1807d21b406ab86aef1 Mon Sep 17 00:00:00 2001
   2 From: wavelet2 <20504977+wavelet2@users.noreply.github.com>
   3 Date: Mon, 15 Apr 2019 10:00:20 +0100
   4 Subject: [PATCH] Maxim MAX98357A I2S DAC overlay (#2935)
   5
   6 Add overlay for Maxim MAX98357A I2S DAC.
   7
   8 Signed-off-by: Richard Steedman <richard.steedman@gmail.com>
   9 ---
  10  arch/arm/boot/dts/overlays/Makefile           |  1 +
  11  arch/arm/boot/dts/overlays/README             |  9 ++
  12  .../boot/dts/overlays/max98357a-overlay.dts   | 84 +++++++++++++++++++
  13  3 files changed, 94 insertions(+)
  14  create mode 100644 arch/arm/boot/dts/overlays/max98357a-overlay.dts
  15
  16 --- a/arch/arm/boot/dts/overlays/Makefile
  17 +++ b/arch/arm/boot/dts/overlays/Makefile
  18 @@ -75,6 +75,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
  19         justboom-dac.dtbo \
  20         justboom-digi.dtbo \
  21         ltc294x.dtbo \
  22 +       max98357a.dtbo \
  23         mbed-dac.dtbo \
  24         mcp23017.dtbo \
  25         mcp23s17.dtbo \
  26 --- a/arch/arm/boot/dts/overlays/README
  27 +++ b/arch/arm/boot/dts/overlays/README
  28 @@ -1276,6 +1276,15 @@ Params: ltc2941                 Select t
  29                                  See the datasheet for more information.
  30
  31
  32 +Name:   max98357a
  33 +Info:   Configures the Maxim MAX98357A I2S DAC
  34 +Load:   dtoverlay=max98357a,<param>=<val>
  35 +Params: no-sdmode               Driver does not manage the state of the DAC's
  36 +                                SD_MODE pin (i.e. chip is always on).
  37 +        sdmode-pin              integer, GPIO pin connected to the SD_MODE input
  38 +                                of the DAC (default GPIO4 if parameter omitted).
  39 +
  40 +
  41  Name:   mbed-dac
  42  Info:   Configures the mbed AudioCODEC (TLV320AIC23B)
  43  Load:   dtoverlay=mbed-dac
  44 --- /dev/null
  45 +++ b/arch/arm/boot/dts/overlays/max98357a-overlay.dts
  46 @@ -0,0 +1,84 @@
  47 +// Overlay for Maxim MAX98357A audio DAC
  48 +
  49 +// dtparams:
  50 +//     no-sdmode  - SD_MODE pin not managed by driver.
  51 +//     sdmode-pin - Specify GPIO pin to which SD_MODE is connected (default 4).
  52 +
  53 +/dts-v1/;
  54 +/plugin/;
  55 +
  56 +/ {
  57 +       compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
  58 +
  59 +       /* Enable I2S */
  60 +       fragment@0 {
  61 +               target = <&i2s>;
  62 +               __overlay__ {
  63 +                       status = "okay";
  64 +               };
  65 +       };
  66 +
  67 +       /* DAC whose SD_MODE pin is managed by driver (via GPIO pin) */
  68 +       fragment@1 {
  69 +               target-path = "/";
  70 +               __overlay__ {
  71 +                       max98357a_dac: max98357a {
  72 +                               compatible = "maxim,max98357a";
  73 +                               #sound-dai-cells = <0>;
  74 +                               sdmode-gpios = <&gpio 4 0>;   /* 2nd word overwritten by sdmode-pin parameter */
  75 +                               status = "okay";
  76 +                       };
  77 +               };
  78 +       };
  79 +
  80 +       /* DAC whose SD_MODE pin is not managed by driver */
  81 +       fragment@2 {
  82 +               target-path = "/";
  83 +               __dormant__ {
  84 +                       max98357a_nsd: max98357a {
  85 +                               compatible = "maxim,max98357a";
  86 +                               #sound-dai-cells = <0>;
  87 +                               status = "okay";
  88 +                       };
  89 +               };
  90 +       };
  91 +
  92 +       /* Soundcard connecting I2S to DAC with SD_MODE */
  93 +       fragment@3 {
  94 +               target = <&sound>;
  95 +               __overlay__ {
  96 +                       compatible = "simple-audio-card";
  97 +                       simple-audio-card,format = "i2s";
  98 +                       simple-audio-card,name = "MAX98357A";
  99 +                       status = "okay";
 100 +                       simple-audio-card,cpu {
 101 +                               sound-dai = <&i2s>;
 102 +                       };
 103 +                       simple-audio-card,codec {
 104 +                               sound-dai = <&max98357a_dac>;
 105 +                       };
 106 +               };
 107 +       };
 108 +
 109 +       /* Soundcard connecting I2S to DAC without SD_MODE */
 110 +       fragment@4 {
 111 +               target = <&sound>;
 112 +               __dormant__ {
 113 +                       compatible = "simple-audio-card";
 114 +                       simple-audio-card,format = "i2s";
 115 +                       simple-audio-card,name = "MAX98357A";
 116 +                       status = "okay";
 117 +                       simple-audio-card,cpu {
 118 +                               sound-dai = <&i2s>;
 119 +                       };
 120 +                       simple-audio-card,codec {
 121 +                               sound-dai = <&max98357a_nsd>;
 122 +                       };
 123 +               };
 124 +       };
 125 +
 126 +       __overrides__ {
 127 +               no-sdmode  = <0>,"-1+2-3+4";
 128 +               sdmode-pin = <&max98357a_dac>,"sdmode-gpios:4";
 129 +       };
 130 +};