target/linux/bcm27xx/patches-5.10/950-0698-overlays-Add-overlay-for-Si446x-Transceiver-SPI.patch

   1 From 7f747c53fc4afa9a25eeb3ca290b4fed4690ca3f Mon Sep 17 00:00:00 2001
   2 From: "Sunip K. Mukherjee" <sunipkmukherjee@gmail.com>
   3 Date: Sun, 4 Jul 2021 16:03:07 -0400
   4 Subject: [PATCH] overlays: Add overlay for Si446x Transceiver SPI
   5
   6 See: https://github.com/raspberrypi/linux/pull/4430
   7
   8 Signed-off-by: Sunip K. Mukherjee <sunipkmukherjee@gmail.com>
   9 ---
  10  arch/arm/boot/dts/overlays/Makefile           |  1 +
  11  arch/arm/boot/dts/overlays/README             | 10 ++++
  12  .../boot/dts/overlays/si446x-spi0-overlay.dts | 53 +++++++++++++++++++
  13  3 files changed, 64 insertions(+)
  14  create mode 100644 arch/arm/boot/dts/overlays/si446x-spi0-overlay.dts
  15
  16 --- a/arch/arm/boot/dts/overlays/Makefile
  17 +++ b/arch/arm/boot/dts/overlays/Makefile
  18 @@ -176,6 +176,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
  19         seeed-can-fd-hat-v1.dtbo \
  20         seeed-can-fd-hat-v2.dtbo \
  21         sh1106-spi.dtbo \
  22 +       si446x-spi0.dtbo \
  23         smi.dtbo \
  24         smi-dev.dtbo \
  25         smi-nand.dtbo \
  26 --- a/arch/arm/boot/dts/overlays/README
  27 +++ b/arch/arm/boot/dts/overlays/README
  28 @@ -2733,6 +2733,16 @@ Params: speed                   SPI bus
  29          height                  Display height (32 or 64; default 64)
  30
  31
  32 +Name:   si446x-spi0
  33 +Info:   Overlay for Si446x UHF Transceiver via SPI using si446x driver.
  34 +        The driver is currently out-of-tree at
  35 +        https://github.com/sunipkmukherjee/silabs.git
  36 +Load:   dtoverlay=si446x-spi0,<param>=<val>
  37 +Params: speed                   SPI bus speed (default 4000000)
  38 +        int_pin                 GPIO pin for interrupts (default 17)
  39 +        reset_pin               GPIO pin for RESET (default 27)
  40 +
  41 +
  42  Name:   smi
  43  Info:   Enables the Secondary Memory Interface peripheral. Uses GPIOs 2-25!
  44  Load:   dtoverlay=smi
  45 --- /dev/null
  46 +++ b/arch/arm/boot/dts/overlays/si446x-spi0-overlay.dts
  47 @@ -0,0 +1,53 @@
  48 +// Overlay for the SiLabs Si446X Controller - SPI0
  49 +// Default Interrupt Pin: 17
  50 +// Default SDN Pin: 27
  51 +/dts-v1/;
  52 +/plugin/;
  53 +
  54 +   / {
  55 +    compatible = "brcm,bcm2835";
  56 +
  57 +    fragment@0 {
  58 +        target = <&spi0>;
  59 +        __overlay__ {
  60 +            // needed to avoid dtc warning
  61 +            #address-cells = <1>;
  62 +            #size-cells = <0>;
  63 +
  64 +            status = "okay";
  65 +
  66 +            uhf0: si446x@0{
  67 +                compatible = "silabs,si446x";
  68 +                reg = <0>; // CE0
  69 +                pinctrl-names = "default";
  70 +                pinctrl-0 = <&uhf0_pins>;
  71 +                interrupt-parent = <&gpio>;
  72 +                interrupts = <17 0x2>; // falling edge
  73 +                spi-max-frequency = <4000000>;
  74 +                sdn_pin = <27>;
  75 +                irq_pin = <17>;
  76 +                status = "okay";
  77 +            };
  78 +        };
  79 +    };
  80 +
  81 +    fragment@1 {
  82 +        target = <&gpio>;
  83 +        __overlay__ {
  84 +            uhf0_pins: uhf0_pins {
  85 +                brcm,pins = <17 27>;
  86 +                brcm,function = <0 1>; // in, out
  87 +                brcm,pull = <2 0>; // high, none
  88 +            };
  89 +        };
  90 +    };
  91 +
  92 +    __overrides__ {
  93 +        int_pin = <&uhf0>, "interrupts:0",
  94 +                  <&uhf0>, "irq_pin:0",
  95 +                  <&uhf0_pins>, "brcm,pins:0";
  96 +        reset_pin = <&uhf0>, "sdn_pin:0",
  97 +                    <&uhf0_pins>, "brcm,pins:4";
  98 +        speed   = <&uhf0>, "spi-max-frequency:0";
  99 +    };
 100 +};