target/linux/brcm2708/patches-4.4/0570-BCM270X_DT-Add-spi0-cs-overlay.patch

   1 From 1a2339385e478e3ae3ee4f79edbfefd7fd22e96c Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Mon, 16 Jan 2017 14:53:12 +0000
   4 Subject: [PATCH] BCM270X_DT: Add spi0-cs overlay
   5
   6 The spi0-cs overlay allows the software chip selectts to be modified
   7 using the cs0_pin and cs1_pin parameters.
   8 ---
   9  arch/arm/boot/dts/overlays/Makefile            |  1 +
  10  arch/arm/boot/dts/overlays/README              |  9 +++++++-
  11  arch/arm/boot/dts/overlays/spi0-cs-overlay.dts | 29 ++++++++++++++++++++++++++
  12  3 files changed, 38 insertions(+), 1 deletion(-)
  13  create mode 100644 arch/arm/boot/dts/overlays/spi0-cs-overlay.dts
  14
  15 --- a/arch/arm/boot/dts/overlays/Makefile
  16 +++ b/arch/arm/boot/dts/overlays/Makefile
  17 @@ -93,6 +93,7 @@ dtbo-$(RPI_DT_OVERLAYS) += smi-dev.dtbo
  18  dtbo-$(RPI_DT_OVERLAYS) += smi-nand.dtbo
  19  dtbo-$(RPI_DT_OVERLAYS) += spi-gpio35-39.dtbo
  20  dtbo-$(RPI_DT_OVERLAYS) += spi-rtc.dtbo
  21 +dtbo-$(RPI_DT_OVERLAYS) += spi0-cs.dtbo
  22  dtbo-$(RPI_DT_OVERLAYS) += spi0-hw-cs.dtbo
  23  dtbo-$(RPI_DT_OVERLAYS) += spi1-1cs.dtbo
  24  dtbo-$(RPI_DT_OVERLAYS) += spi1-2cs.dtbo
  25 --- a/arch/arm/boot/dts/overlays/README
  26 +++ b/arch/arm/boot/dts/overlays/README
  27 @@ -1131,7 +1131,7 @@ Params: <None>
  28
  29
  30  Name:   spi-gpio35-39
  31 -Info:   move SPI function block to GPIO 35 to 39
  32 +Info:   Move SPI function block to GPIO 35 to 39
  33  Load:   dtoverlay=spi-gpio35-39
  34  Params: <None>
  35
  36 @@ -1142,6 +1142,13 @@ Load:   dtoverlay=spi-rtc,<param>=<val>
  37  Params: pcf2123                 Select the PCF2123 device
  38
  39
  40 +Name:   spi0-cs
  41 +Info:   Allows the (software) CS pins for SPI0 to be changed
  42 +Load:   dtoverlay=spi0-cs,<param>=<val>
  43 +Params: cs0_pin                 GPIO pin for CS0 (default 8)
  44 +        cs1_pin                 GPIO pin for CS1 (default 7)
  45 +
  46 +
  47  Name:   spi0-hw-cs
  48  Info:   Re-enables hardware CS/CE (chip selects) for SPI0
  49  Load:   dtoverlay=spi0-hw-cs
  50 --- /dev/null
  51 +++ b/arch/arm/boot/dts/overlays/spi0-cs-overlay.dts
  52 @@ -0,0 +1,29 @@
  53 +/dts-v1/;
  54 +/plugin/;
  55 +
  56 +
  57 +/ {
  58 +       compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
  59 +
  60 +       fragment@0 {
  61 +               target = <&spi0_cs_pins>;
  62 +               frag0: __overlay__ {
  63 +                       brcm,pins = <8 7>;
  64 +               };
  65 +       };
  66 +
  67 +       fragment@1 {
  68 +               target = <&spi0>;
  69 +               frag1: __overlay__ {
  70 +                       cs-gpios = <&gpio 8 1>, <&gpio 7 1>;
  71 +                       status = "okay";
  72 +               };
  73 +       };
  74 +
  75 +       __overrides__ {
  76 +               cs0_pin  = <&frag0>,"brcm,pins:0",
  77 +                          <&frag1>,"cs-gpios:4";
  78 +               cs1_pin  = <&frag0>,"brcm,pins:4",
  79 +                          <&frag1>,"cs-gpios:16";
  80 +       };
  81 +};