target/linux/brcm2708/patches-4.4/0422-BCM270X_DT-Overlay-to-re-enable-HW-CS-on-SPI0.patch

   1 From b8fdcf0f9af482e7dfa6fc5bb470318696789a52 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Fri, 1 Jul 2016 22:34:52 +0100
   4 Subject: [PATCH 422/423] BCM270X_DT: Overlay to re-enable HW CS on SPI0
   5
   6 See: https://github.com/raspberrypi/linux/issues/1547
   7
   8 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
   9 ---
  10  arch/arm/boot/dts/overlays/Makefile               |  1 +
  11  arch/arm/boot/dts/overlays/README                 |  6 ++++++
  12  arch/arm/boot/dts/overlays/spi0-hw-cs-overlay.dts | 26 +++++++++++++++++++++++
  13  3 files changed, 33 insertions(+)
  14  create mode 100644 arch/arm/boot/dts/overlays/spi0-hw-cs-overlay.dts
  15
  16 --- a/arch/arm/boot/dts/overlays/Makefile
  17 +++ b/arch/arm/boot/dts/overlays/Makefile
  18 @@ -81,6 +81,7 @@ dtbo-$(RPI_DT_OVERLAYS) += smi-dev.dtbo
  19  dtbo-$(RPI_DT_OVERLAYS) += smi-nand.dtbo
  20  dtbo-$(RPI_DT_OVERLAYS) += spi-gpio35-39.dtbo
  21  dtbo-$(RPI_DT_OVERLAYS) += spi-rtc.dtbo
  22 +dtbo-$(RPI_DT_OVERLAYS) += spi0-hw-cs.dtbo
  23  dtbo-$(RPI_DT_OVERLAYS) += spi1-1cs.dtbo
  24  dtbo-$(RPI_DT_OVERLAYS) += spi1-2cs.dtbo
  25  dtbo-$(RPI_DT_OVERLAYS) += spi1-3cs.dtbo
  26 --- a/arch/arm/boot/dts/overlays/README
  27 +++ b/arch/arm/boot/dts/overlays/README
  28 @@ -1006,6 +1006,12 @@ Load:   dtoverlay=spi-rtc,<param>=<val>
  29  Params: pcf2123                 Select the PCF2123 device
  30
  31
  32 +Name:   spi0-hw-cs
  33 +Info:   Re-enables hardware CS/CE (chip selects) for SPI0
  34 +Load:   dtoverlay=spi0-hw-cs
  35 +Params: <None>
  36 +
  37 +
  38  Name:   spi1-1cs
  39  Info:   Enables spi1 with a single chip select (CS) line and associated spidev
  40          dev node. The gpio pin number for the CS line and spidev device node
  41 --- /dev/null
  42 +++ b/arch/arm/boot/dts/overlays/spi0-hw-cs-overlay.dts
  43 @@ -0,0 +1,26 @@
  44 +/*
  45 + * Device tree overlay to re-enable hardware CS for SPI0
  46 + */
  47 +
  48 +/dts-v1/;
  49 +/plugin/;
  50 +
  51 +/ {
  52 +       compatible = "brcm,bcm2835", "brcm,bcm2836", "brcm,bcm2708", "brcm,bcm2709";
  53 +
  54 +       fragment@0 {
  55 +               target = <&spi0>;
  56 +               __overlay__ {
  57 +                       cs-gpios = <0>, <0>;
  58 +                       status = "okay";
  59 +               };
  60 +       };
  61 +
  62 +       fragment@1 {
  63 +               target = <&spi0_cs_pins>;
  64 +               __overlay__ {
  65 +                       brcm,pins = <8 7>;
  66 +                       brcm,function = <4>; /* alt0 */
  67 +               };
  68 +       };
  69 +};