target/linux/brcm2708/patches-4.4/0418-dts-Add-overlay-for-NXP-SC16IS752-Dual-UART-with-SPI.patch

   1 From 23074d03200bc35acdb2ebd8a127fb6b832307fc Mon Sep 17 00:00:00 2001
   2 From: Erdem MEYDANLI <erdem.meydanli@punica.com.tr>
   3 Date: Thu, 30 Jun 2016 21:05:08 +0300
   4 Subject: [PATCH] dts: Add overlay for NXP SC16IS752 Dual UART with SPI
   5  Interface
   6
   7 ---
   8  arch/arm/boot/dts/overlays/Makefile                |  1 +
   9  arch/arm/boot/dts/overlays/README                  | 10 ++++
  10  .../boot/dts/overlays/sc16is752-spi1-overlay.dts   | 61 ++++++++++++++++++++++
  11  3 files changed, 72 insertions(+)
  12  create mode 100644 arch/arm/boot/dts/overlays/sc16is752-spi1-overlay.dts
  13
  14 --- a/arch/arm/boot/dts/overlays/Makefile
  15 +++ b/arch/arm/boot/dts/overlays/Makefile
  16 @@ -71,6 +71,7 @@ dtbo-$(RPI_DT_OVERLAYS) += rpi-ft5406.dt
  17  dtbo-$(RPI_DT_OVERLAYS) += rpi-proto.dtbo
  18  dtbo-$(RPI_DT_OVERLAYS) += rpi-sense.dtbo
  19  dtbo-$(RPI_DT_OVERLAYS) += rra-digidac1-wm8741-audio.dtbo
  20 +dtbo-$(RPI_DT_OVERLAYS) += sc16is752-spi1.dtbo
  21  dtbo-$(RPI_DT_OVERLAYS) += sdhost.dtbo
  22  dtbo-$(RPI_DT_OVERLAYS) += sdio.dtbo
  23  dtbo-$(RPI_DT_OVERLAYS) += sdio-1bit.dtbo
  24 --- a/arch/arm/boot/dts/overlays/README
  25 +++ b/arch/arm/boot/dts/overlays/README
  26 @@ -888,6 +888,16 @@ Load:   dtoverlay=rra-digidac1-wm8741-au
  27  Params: <None>
  28
  29
  30 +Name:   sc16is752-spi1
  31 +Info:   Overlay for the NXP SC16IS752 Dual UART with SPI Interface
  32 +        Enables the chip on SPI1.
  33 +        N.B.: spi1 is only accessible on devices with a 40pin header, eg:
  34 +              A+, B+, Zero and PI2 B; as well as the Compute Module.
  35 +
  36 +Load:   dtoverlay=sc16is752-spi1,<param>=<val>
  37 +Params: int_pin                 GPIO used for IRQ (default 24)
  38 +
  39 +
  40  Name:   sdhost
  41  Info:   Selects the bcm2835-sdhost SD/MMC driver, optionally with overclock.
  42          N.B. This overlay is designed for situations where the mmc driver is
  43 --- /dev/null
  44 +++ b/arch/arm/boot/dts/overlays/sc16is752-spi1-overlay.dts
  45 @@ -0,0 +1,61 @@
  46 +/dts-v1/;
  47 +/plugin/;
  48 +
  49 +/ {
  50 +       compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
  51 +
  52 +       fragment@0 {
  53 +               target = <&gpio>;
  54 +               __overlay__ {
  55 +                       spi1_pins: spi1_pins {
  56 +                               brcm,pins = <19 20 21>;
  57 +                               brcm,function = <3>; /* alt4 */
  58 +                       };
  59 +
  60 +                       spi1_cs_pins: spi1_cs_pins {
  61 +                               brcm,pins = <18>;
  62 +                               brcm,function = <1>; /* output */
  63 +                       };
  64 +               };
  65 +       };
  66 +
  67 +       fragment@1 {
  68 +               target = <&spi1>;
  69 +               frag1: __overlay__ {
  70 +                       #address-cells = <1>;
  71 +                       #size-cells = <0>;
  72 +                       pinctrl-names = "default";
  73 +                       pinctrl-0 = <&spi1_pins &spi1_cs_pins>;
  74 +                       cs-gpios = <&gpio 18 1>;
  75 +                       status = "okay";
  76 +
  77 +                       sc16is752: sc16is752@0 {
  78 +                               compatible = "nxp,sc16is752";
  79 +                               reg = <0>; /* CE0 */
  80 +                               clocks = <&sc16is752_clk>;
  81 +                               interrupt-parent = <&gpio>;
  82 +                               interrupts = <24 2>; /* IRQ_TYPE_EDGE_FALLING */
  83 +                               #gpio-controller;
  84 +                               #gpio-cells = <2>;
  85 +                               spi-max-frequency = <4000000>;
  86 +
  87 +                               sc16is752_clk: sc16is752_clk {
  88 +                                       compatible = "fixed-clock";
  89 +                                       #clock-cells = <0>;
  90 +                                       clock-frequency = <14745600>;
  91 +                               };
  92 +                       };
  93 +               };
  94 +       };
  95 +
  96 +       fragment@2 {
  97 +               target = <&aux>;
  98 +               __overlay__ {
  99 +                       status = "okay";
 100 +               };
 101 +       };
 102 +
 103 +    __overrides__ {
 104 +      int_pin = <&sc16is752>,"interrupts:0";
 105 +    };
 106 +};