target/linux/brcm2708/patches-4.9/0125-BCM270X_DT-Add-spi0-cs-overlay.patch

   1 From 48eea36959fb8d854b4cf1ee4284646be5a279e0 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 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  10 ---
  11  arch/arm/boot/dts/overlays/Makefile            |  1 +
  12  arch/arm/boot/dts/overlays/README              |  9 +++++++-
  13  arch/arm/boot/dts/overlays/spi0-cs-overlay.dts | 29 ++++++++++++++++++++++++++
  14  3 files changed, 38 insertions(+), 1 deletion(-)
  15  create mode 100644 arch/arm/boot/dts/overlays/spi0-cs-overlay.dts
  16
  17 --- a/arch/arm/boot/dts/overlays/Makefile
  18 +++ b/arch/arm/boot/dts/overlays/Makefile
  19 @@ -83,6 +83,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
  20         smi-nand.dtbo \
  21         spi-gpio35-39.dtbo \
  22         spi-rtc.dtbo \
  23 +       spi0-cs.dtbo \
  24         spi0-hw-cs.dtbo \
  25         spi1-1cs.dtbo \
  26         spi1-2cs.dtbo \
  27 --- a/arch/arm/boot/dts/overlays/README
  28 +++ b/arch/arm/boot/dts/overlays/README
  29 @@ -1138,7 +1138,7 @@ Params: <None>
  30
  31
  32  Name:   spi-gpio35-39
  33 -Info:   move SPI function block to GPIO 35 to 39
  34 +Info:   Move SPI function block to GPIO 35 to 39
  35  Load:   dtoverlay=spi-gpio35-39
  36  Params: <None>
  37
  38 @@ -1149,6 +1149,13 @@ Load:   dtoverlay=spi-rtc,<param>=<val>
  39  Params: pcf2123                 Select the PCF2123 device
  40
  41
  42 +Name:   spi0-cs
  43 +Info:   Allows the (software) CS pins for SPI0 to be changed
  44 +Load:   dtoverlay=spi0-cs,<param>=<val>
  45 +Params: cs0_pin                 GPIO pin for CS0 (default 8)
  46 +        cs1_pin                 GPIO pin for CS1 (default 7)
  47 +
  48 +
  49  Name:   spi0-hw-cs
  50  Info:   Re-enables hardware CS/CE (chip selects) for SPI0
  51  Load:   dtoverlay=spi0-hw-cs
  52 --- /dev/null
  53 +++ b/arch/arm/boot/dts/overlays/spi0-cs-overlay.dts
  54 @@ -0,0 +1,29 @@
  55 +/dts-v1/;
  56 +/plugin/;
  57 +
  58 +
  59 +/ {
  60 +       compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
  61 +
  62 +       fragment@0 {
  63 +               target = <&spi0_cs_pins>;
  64 +               frag0: __overlay__ {
  65 +                       brcm,pins = <8 7>;
  66 +               };
  67 +       };
  68 +
  69 +       fragment@1 {
  70 +               target = <&spi0>;
  71 +               frag1: __overlay__ {
  72 +                       cs-gpios = <&gpio 8 1>, <&gpio 7 1>;
  73 +                       status = "okay";
  74 +               };
  75 +       };
  76 +
  77 +       __overrides__ {
  78 +               cs0_pin  = <&frag0>,"brcm,pins:0",
  79 +                          <&frag1>,"cs-gpios:4";
  80 +               cs1_pin  = <&frag0>,"brcm,pins:4",
  81 +                          <&frag1>,"cs-gpios:16";
  82 +       };
  83 +};