target/linux/bcm27xx/patches-4.19/950-0619-overlays-audremap-Support-GPIOs-18-19.patch

   1 From f42cc245e1f3e586f1a26550e5760489b6c329ab Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Tue, 23 Jul 2019 12:55:07 +0100
   4 Subject: [PATCH] overlays: audremap: Support GPIOs 18 & 19
   5
   6 PWM audio can also be used on GPIOs 18 and 19, so add the pins_18_19
   7 parameter to select that location. pins_12_13 explicitly chooses GPIOs
   8 12 and 13, although this is the default behaviour so is there only for
   9 completeness.
  10
  11 See: https://github.com/raspberrypi/firmware/issues/1178
  12
  13 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  14 ---
  15  arch/arm/boot/dts/overlays/README               |  4 +++-
  16  arch/arm/boot/dts/overlays/audremap-overlay.dts | 16 ++++++++++++++++
  17  2 files changed, 19 insertions(+), 1 deletion(-)
  18
  19 --- a/arch/arm/boot/dts/overlays/README
  20 +++ b/arch/arm/boot/dts/overlays/README
  21 @@ -475,12 +475,14 @@ Params: <None>
  22
  23
  24  Name:   audremap
  25 -Info:   Switches PWM sound output to pins 12 (Right) & 13 (Left)
  26 +Info:   Switches PWM sound output to GPIOs on the 40-pin header
  27  Load:   dtoverlay=audremap,<param>=<val>
  28  Params: swap_lr                 Reverse the channel allocation, which will also
  29                                  swap the audio jack outputs (default off)
  30          enable_jack             Don't switch off the audio jack output
  31                                  (default off)
  32 +        pins_12_13              Select GPIOs 12 & 13 (default)
  33 +        pins_18_19              Select GPIOs 18 & 19
  34
  35
  36  Name:   balena-fin
  37 --- a/arch/arm/boot/dts/overlays/audremap-overlay.dts
  38 +++ b/arch/arm/boot/dts/overlays/audremap-overlay.dts
  39 @@ -7,13 +7,29 @@
  40          fragment@0 {
  41                  target = <&audio_pins>;
  42                  frag0: __overlay__ {
  43 +                };
  44 +        };
  45 +
  46 +       fragment@1 {
  47 +                target = <&audio_pins>;
  48 +                __overlay__ {
  49                          brcm,pins = < 12 13 >;
  50                          brcm,function = < 4 >; /* alt0 alt0 */
  51                  };
  52          };
  53
  54 +       fragment@2 {
  55 +               target = <&audio_pins>;
  56 +               __dormant__ {
  57 +                        brcm,pins = < 18 19 >;
  58 +                        brcm,function = < 2 >; /* alt5 alt5 */
  59 +               };
  60 +       };
  61 +
  62         __overrides__ {
  63                 swap_lr = <&frag0>, "swap_lr?";
  64                 enable_jack = <&frag0>, "enable_jack?";
  65 +               pins_12_13 = <0>,"+1-2";
  66 +               pins_18_19 = <0>,"-1+2";
  67         };
  68  };