target/linux/brcm2708/patches-4.1/0107-BCM270X_DT-Overlay-for-the-Fen-Logic-VGA666-board.patch

   1 From ee874bae0042910abccd54b90e411a852b4569ef Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Tue, 30 Jun 2015 09:10:36 +0100
   4 Subject: [PATCH 107/148] BCM270X_DT: Overlay for the Fen Logic VGA666 board
   5
   6 The VGA666 board requires GPIOs 2-21 (so no I2C or UART). Using the
   7 overlay (instead of a custom dt-blob.bin) has the advantage that it will
   8 reserve those pins and stop other devices using them (except for GPIO),
   9 but it does delay the point at which the output becomes valid until 2-3
  10 seconds after the kernel has started.
  11 ---
  12  arch/arm/boot/dts/overlays/Makefile           |  1 +
  13  arch/arm/boot/dts/overlays/README             |  8 +++++++
  14  arch/arm/boot/dts/overlays/vga666-overlay.dts | 30 +++++++++++++++++++++++++++
  15  3 files changed, 39 insertions(+)
  16  create mode 100644 arch/arm/boot/dts/overlays/vga666-overlay.dts
  17
  18 --- a/arch/arm/boot/dts/overlays/Makefile
  19 +++ b/arch/arm/boot/dts/overlays/Makefile
  20 @@ -43,6 +43,7 @@ dtb-$(RPI_DT_OVERLAYS) += spi-bcm2708-ov
  21  dtb-$(RPI_DT_OVERLAYS) += spi-bcm2835-overlay.dtb
  22  dtb-$(RPI_DT_OVERLAYS) += tinylcd35-overlay.dtb
  23  dtb-$(RPI_DT_OVERLAYS) += uart1-overlay.dtb
  24 +dtb-$(RPI_DT_OVERLAYS) += vga666-overlay.dtb
  25  dtb-$(RPI_DT_OVERLAYS) += w1-gpio-overlay.dtb
  26  dtb-$(RPI_DT_OVERLAYS) += w1-gpio-pullup-overlay.dtb
  27
  28 --- a/arch/arm/boot/dts/overlays/README
  29 +++ b/arch/arm/boot/dts/overlays/README
  30 @@ -497,6 +497,14 @@ Params: txd1_pin                 GPIO pi
  31          rxd1_pin                 GPIO pin for RXD1 (15, 33 or 41 - default 15)
  32
  33
  34 +Name:   vga666
  35 +Info:   Overlay for the Fen Logic VGA666 board
  36 +        This uses GPIOs 2-21 (so no I2C), and activates the output 2-3 seconds
  37 +        after the kernel has started.
  38 +Load:   dtoverlay=vga666
  39 +Params: <None>
  40 +
  41 +
  42  Name:   w1-gpio
  43  Info:   Configures the w1-gpio Onewire interface module.
  44          Use this overlay if you *don't* need a GPIO to drive an external pullup.
  45 --- /dev/null
  46 +++ b/arch/arm/boot/dts/overlays/vga666-overlay.dts
  47 @@ -0,0 +1,30 @@
  48 +/dts-v1/;
  49 +/plugin/;
  50 +
  51 +/{
  52 +       compatible = "brcm,bcm2708";
  53 +
  54 +       // There is no VGA driver module, but we need a platform device
  55 +       // node (that doesn't already use pinctrl) to hang the pinctrl
  56 +       // reference on - leds will do
  57 +
  58 +       fragment@0 {
  59 +               target = <&leds>;
  60 +               __overlay__ {
  61 +                       pinctrl-names = "default";
  62 +                       pinctrl-0 = <&vga666_pins>;
  63 +               };
  64 +       };
  65 +
  66 +       fragment@1 {
  67 +               target = <&gpio>;
  68 +               __overlay__ {
  69 +                       vga666_pins: vga666_pins {
  70 +                               brcm,pins = <2 3 4 5 6 7 8 9 10 11 12
  71 +                                            13 14 15 16 17 18 19 20 21>;
  72 +                               brcm,function = <6>; /* alt2 */
  73 +                               brcm,pull = <0>; /* no pull */
  74 +                       };
  75 +               };
  76 +       };
  77 +};