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 diff --git a/arch/arm/boot/dts/overlays/Makefile b/arch/arm/boot/dts/overlays/Makefile
  16 index 05eda03..72f2d90a 100644
  17 --- a/arch/arm/boot/dts/overlays/Makefile
  18 +++ b/arch/arm/boot/dts/overlays/Makefile
  19 @@ -93,6 +93,7 @@ dtbo-$(RPI_DT_OVERLAYS) += smi-dev.dtbo
  20  dtbo-$(RPI_DT_OVERLAYS) += smi-nand.dtbo
  21  dtbo-$(RPI_DT_OVERLAYS) += spi-gpio35-39.dtbo
  22  dtbo-$(RPI_DT_OVERLAYS) += spi-rtc.dtbo
  23 +dtbo-$(RPI_DT_OVERLAYS) += spi0-cs.dtbo
  24  dtbo-$(RPI_DT_OVERLAYS) += spi0-hw-cs.dtbo
  25  dtbo-$(RPI_DT_OVERLAYS) += spi1-1cs.dtbo
  26  dtbo-$(RPI_DT_OVERLAYS) += spi1-2cs.dtbo
  27 diff --git a/arch/arm/boot/dts/overlays/README b/arch/arm/boot/dts/overlays/README
  28 index adb86bc..7f4bd29 100644
  29 --- a/arch/arm/boot/dts/overlays/README
  30 +++ b/arch/arm/boot/dts/overlays/README
  31 @@ -1131,7 +1131,7 @@ Params: <None>
  32
  33
  34  Name:   spi-gpio35-39
  35 -Info:   move SPI function block to GPIO 35 to 39
  36 +Info:   Move SPI function block to GPIO 35 to 39
  37  Load:   dtoverlay=spi-gpio35-39
  38  Params: <None>
  39
  40 @@ -1142,6 +1142,13 @@ Load:   dtoverlay=spi-rtc,<param>=<val>
  41  Params: pcf2123                 Select the PCF2123 device
  42
  43
  44 +Name:   spi0-cs
  45 +Info:   Allows the (software) CS pins for SPI0 to be changed
  46 +Load:   dtoverlay=spi0-cs,<param>=<val>
  47 +Params: cs0_pin                 GPIO pin for CS0 (default 8)
  48 +        cs1_pin                 GPIO pin for CS1 (default 7)
  49 +
  50 +
  51  Name:   spi0-hw-cs
  52  Info:   Re-enables hardware CS/CE (chip selects) for SPI0
  53  Load:   dtoverlay=spi0-hw-cs
  54 diff --git a/arch/arm/boot/dts/overlays/spi0-cs-overlay.dts b/arch/arm/boot/dts/overlays/spi0-cs-overlay.dts
  55 new file mode 100644
  56 index 0000000..7f79029
  57 --- /dev/null
  58 +++ b/arch/arm/boot/dts/overlays/spi0-cs-overlay.dts
  59 @@ -0,0 +1,29 @@
  60 +/dts-v1/;
  61 +/plugin/;
  62 +
  63 +
  64 +/ {
  65 +       compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
  66 +
  67 +       fragment@0 {
  68 +               target = <&spi0_cs_pins>;
  69 +               frag0: __overlay__ {
  70 +                       brcm,pins = <8 7>;
  71 +               };
  72 +       };
  73 +
  74 +       fragment@1 {
  75 +               target = <&spi0>;
  76 +               frag1: __overlay__ {
  77 +                       cs-gpios = <&gpio 8 1>, <&gpio 7 1>;
  78 +                       status = "okay";
  79 +               };
  80 +       };
  81 +
  82 +       __overrides__ {
  83 +               cs0_pin  = <&frag0>,"brcm,pins:0",
  84 +                          <&frag1>,"cs-gpios:4";
  85 +               cs1_pin  = <&frag0>,"brcm,pins:4",
  86 +                          <&frag1>,"cs-gpios:16";
  87 +       };
  88 +};
  89 --
  90 2.1.4
  91