target/linux/brcm2708/patches-4.4/0491-overlays-added-sc16is750-UART-over-I2C-1617.patch

   1 From 81d6acbdeecbca2db335d5c8362898df3d4fa8a3 Mon Sep 17 00:00:00 2001
   2 From: Georgii Staroselskii <gosha371@gmail.com>
   3 Date: Tue, 23 Aug 2016 17:40:05 +0400
   4 Subject: [PATCH] overlays: added sc16is750 UART over I2C (#1617)
   5
   6 ---
   7  arch/arm/boot/dts/overlays/Makefile                |  1 +
   8  arch/arm/boot/dts/overlays/README                  | 10 ++++++
   9  .../boot/dts/overlays/sc16is750-i2c-overlay.dts    | 37 ++++++++++++++++++++++
  10  3 files changed, 48 insertions(+)
  11  create mode 100644 arch/arm/boot/dts/overlays/sc16is750-i2c-overlay.dts
  12
  13 --- a/arch/arm/boot/dts/overlays/Makefile
  14 +++ b/arch/arm/boot/dts/overlays/Makefile
  15 @@ -75,6 +75,7 @@ dtbo-$(RPI_DT_OVERLAYS) += rpi-ft5406.dt
  16  dtbo-$(RPI_DT_OVERLAYS) += rpi-proto.dtbo
  17  dtbo-$(RPI_DT_OVERLAYS) += rpi-sense.dtbo
  18  dtbo-$(RPI_DT_OVERLAYS) += rra-digidac1-wm8741-audio.dtbo
  19 +dtbo-$(RPI_DT_OVERLAYS) += sc16is750-i2c.dtbo
  20  dtbo-$(RPI_DT_OVERLAYS) += sc16is752-spi1.dtbo
  21  dtbo-$(RPI_DT_OVERLAYS) += sdhost.dtbo
  22  dtbo-$(RPI_DT_OVERLAYS) += sdio.dtbo
  23 --- a/arch/arm/boot/dts/overlays/README
  24 +++ b/arch/arm/boot/dts/overlays/README
  25 @@ -935,6 +935,16 @@ Load:   dtoverlay=rra-digidac1-wm8741-au
  26  Params: <None>
  27
  28
  29 +Name:   sc16is750-i2c
  30 +Info:   Overlay for the NXP SC16IS750 UART with I2C Interface
  31 +        Enables the chip on I2C1 at 0x48. To select another address,
  32 +        please refer to table 10 in reference manual.
  33 +
  34 +Load:   dtoverlay=sc16is750-i2c,<param>=<val>
  35 +Params: int_pin                 GPIO used for IRQ (default 24)
  36 +        addr                    Address (default 0x48)
  37 +
  38 +
  39  Name:   sc16is752-spi1
  40  Info:   Overlay for the NXP SC16IS752 Dual UART with SPI Interface
  41          Enables the chip on SPI1.
  42 --- /dev/null
  43 +++ b/arch/arm/boot/dts/overlays/sc16is750-i2c-overlay.dts
  44 @@ -0,0 +1,37 @@
  45 +/dts-v1/;
  46 +/plugin/;
  47 +
  48 +/ {
  49 +       compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
  50 +
  51 +       fragment@0 {
  52 +               target = <&i2c_arm>;
  53 +               __overlay__ {
  54 +                       #address-cells = <1>;
  55 +                       #size-cells = <0>;
  56 +                       status = "okay";
  57 +
  58 +                       sc16is750: sc16is750@48 {
  59 +                               compatible = "nxp,sc16is750";
  60 +                               reg = <0x48>; /* address */
  61 +                               clocks = <&sc16is750_clk>;
  62 +                               interrupt-parent = <&gpio>;
  63 +                               interrupts = <24 2>; /* IRQ_TYPE_EDGE_FALLING */
  64 +                               #gpio-cells = <2>;
  65 +
  66 +                               sc16is750_clk: sc16is750_clk {
  67 +                                       compatible = "fixed-clock";
  68 +                                       #clock-cells = <0>;
  69 +                                       clock-frequency = <14745600>;
  70 +                               };
  71 +                       };
  72 +               };
  73 +       };
  74 +
  75 +
  76 +       __overrides__ {
  77 +               int_pin = <&sc16is750>,"interrupts:0";
  78 +               addr = <&sc16is750>,"reg:0";
  79 +       };
  80 +
  81 +};