target/linux/brcm2708/patches-4.19/950-0562-overlays-Add-the-spi-gpio40-45-overlay.patch

   1 From 726da40b8c272d181a41686195f91b914363167b Mon Sep 17 00:00:00 2001
   2 From: Tim Gover <tim.gover@raspberrypi.org>
   3 Date: Tue, 22 Jan 2019 10:49:41 +0000
   4 Subject: [PATCH] overlays: Add the spi-gpio40-45 overlay
   5
   6 The 2711 B0 boot EEPROM is programmed via SPI0 on GPIO
   7 pins 40-43 CS0. Add a device tree overlay to optionally
   8 change the SPI0 pinmux from the external GPIO pins to
   9 the boot EEPROM pins.
  10 ---
  11  arch/arm/boot/dts/overlays/Makefile           |  1 +
  12  arch/arm/boot/dts/overlays/README             |  6 ++++
  13  .../dts/overlays/spi-gpio40-45-overlay.dts    | 36 +++++++++++++++++++
  14  3 files changed, 43 insertions(+)
  15  create mode 100644 arch/arm/boot/dts/overlays/spi-gpio40-45-overlay.dts
  16
  17 --- a/arch/arm/boot/dts/overlays/Makefile
  18 +++ b/arch/arm/boot/dts/overlays/Makefile
  19 @@ -135,6 +135,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
  20         smi-dev.dtbo \
  21         smi-nand.dtbo \
  22         spi-gpio35-39.dtbo \
  23 +       spi-gpio40-45.dtbo \
  24         spi-rtc.dtbo \
  25         spi0-cs.dtbo \
  26         spi0-hw-cs.dtbo \
  27 --- a/arch/arm/boot/dts/overlays/README
  28 +++ b/arch/arm/boot/dts/overlays/README
  29 @@ -1967,6 +1967,12 @@ Load:   dtoverlay=spi-gpio35-39
  30  Params: <None>
  31
  32
  33 +Name:   spi-gpio40-45
  34 +Info:   Move SPI function block to GPIOs 40 to 45
  35 +Load:   dtoverlay=spi-gpio40-45
  36 +Params: <None>
  37 +
  38 +
  39  Name:   spi-rtc
  40  Info:   Adds support for a number of SPI Real Time Clock devices
  41  Load:   dtoverlay=spi-rtc,<param>=<val>
  42 --- /dev/null
  43 +++ b/arch/arm/boot/dts/overlays/spi-gpio40-45-overlay.dts
  44 @@ -0,0 +1,36 @@
  45 +/*
  46 + * Boot EEPROM overlay
  47 + */
  48 +
  49 +/dts-v1/;
  50 +/plugin/;
  51 +
  52 +/ {
  53 +       compatible = "brcm,bcm2835";
  54 +
  55 +       fragment@0 {
  56 +               target = <&spi0>;
  57 +               __overlay__ {
  58 +                       cs-gpios = <&gpio 43 1>, <&gpio 44 1>, <&gpio 45 1>;
  59 +                       status = "okay";
  60 +               };
  61 +       };
  62 +
  63 +       fragment@1 {
  64 +               target = <&spi0_cs_pins>;
  65 +               __overlay__ {
  66 +                       brcm,pins = <45 44 43>;
  67 +                       brcm,function = <1>; /* output */
  68 +                       status = "okay";
  69 +               };
  70 +       };
  71 +
  72 +       fragment@2 {
  73 +               target = <&spi0_pins>;
  74 +               __overlay__ {
  75 +                       brcm,pins = <40 41 42>;
  76 +                       brcm,function = <3>; /* alt4 */
  77 +                       status = "okay";
  78 +               };
  79 +       };
  80 +};