target/linux/brcm2708/patches-4.4/0408-BCM270X_DT-Add-spi-rtc-overlay-on-SPI0.0.patch

   1 From 14069cf322a96df5b2fdf4ed68510f7d3178bf2e Mon Sep 17 00:00:00 2001
   2 From: Thomas Kriechbaumer <thomas@kriechbaumer.name>
   3 Date: Fri, 3 Jun 2016 09:40:44 +0200
   4 Subject: [PATCH] BCM270X_DT: Add spi-rtc overlay on SPI0.0
   5
   6 Initial version only supports PCF2123 RTC.
   7
   8 See: https://github.com/raspberrypi/linux/pull/1510
   9 ---
  10  arch/arm/boot/dts/overlays/Makefile            |  1 +
  11  arch/arm/boot/dts/overlays/README              |  6 +++++
  12  arch/arm/boot/dts/overlays/spi-rtc-overlay.dts | 33 ++++++++++++++++++++++++++
  13  3 files changed, 40 insertions(+)
  14  create mode 100644 arch/arm/boot/dts/overlays/spi-rtc-overlay.dts
  15
  16 --- a/arch/arm/boot/dts/overlays/Makefile
  17 +++ b/arch/arm/boot/dts/overlays/Makefile
  18 @@ -78,6 +78,7 @@ dtbo-$(RPI_DT_OVERLAYS) += smi.dtbo
  19  dtbo-$(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) += 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 @@ -975,6 +975,12 @@ Load:   dtoverlay=spi-gpio35-39
  29  Params: <None>
  30
  31
  32 +Name:   spi-rtc
  33 +Info:   Adds support for a number of SPI Real Time Clock devices
  34 +Load:   dtoverlay=spi-rtc,<param>=<val>
  35 +Params: pcf2123                 Select the PCF2123 device
  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/spi-rtc-overlay.dts
  43 @@ -0,0 +1,33 @@
  44 +/dts-v1/;
  45 +/plugin/;
  46 +
  47 +/ {
  48 +       compatible = "brcm,bcm2708";
  49 +
  50 +       fragment@0 {
  51 +               target = <&spidev0>;
  52 +               __dormant__ {
  53 +                       status = "disabled";
  54 +               };
  55 +       };
  56 +
  57 +       fragment@1 {
  58 +               target = <&spi0>;
  59 +               __dormant__ {
  60 +                       #address-cells = <1>;
  61 +                       #size-cells = <0>;
  62 +                       status = "okay";
  63 +
  64 +                       rtc-pcf2123@0 {
  65 +                               compatible = "nxp,rtc-pcf2123";
  66 +                               spi-max-frequency = <5000000>;
  67 +                               spi-cs-high = <1>;
  68 +                               reg = <0>;
  69 +                       };
  70 +               };
  71 +       };
  72 +
  73 +       __overrides__ {
  74 +               pcf2123 = <0>, "=0=1";
  75 +       };
  76 +};