[lora] add lora from https://github.com/starnight/LoRa

utils/lora/Makefile

@@ -0,0 +1,28 @@
+PROJ=sx1278
+obj-m := $(PROJ).o
+
+#KERNEL_LOCATION=/lib/modules/$(shell uname -r)
+KERNEL_LOCATION=../..
+BUILDDIR=$(KERNEL_LOCATION)
+
+all:
+	make -C $(BUILDDIR) M=$(PWD) modules
+
+install:
+	sudo make -C $(BUILDDIR) M=$(PWD) modules_install
+	# Rebuild the kernel module dependencies for modprobe
+	sudo depmod -a
+
+uninstall:
+	sudo modprobe -r $(PROJ)
+	sudo rm $(KERNEL_LOCATION)/extra/$(PROJ).ko.gz
+	# Rebuild the kernel module dependencies for modprobe
+	sudo depmod -a
+
+test:
+	make install; echo
+	ls -l /dev/$(PROJ)*
+	make uninstall
+
+clean:
+	make -C $(BUILDDIR) M=$(PWD) clean

utils/lora/build.sh

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+#!/bin/bash
+make CROSS_COMPILE=arm-linux-gnueabihf- ARCH=arm CFLAGS="-D__LINUX_ARM_ARCH__=7"
+#make

utils/lora/overlay/Makefile

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+OVERLAY_SRC=rpi-lora-spi-overlay.dts
+OVERLAY_DST=rpi-lora-spi.dtbo
+
+all:
+	dtc -I dts -O dtb -@ -o $(OVERLAY_DST) $(OVERLAY_SRC)
+
+test:
+	dtc -I fs /proc/device-tree
+

utils/lora/overlay/README.md

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+# SX1278 Compatible Radio Device Tree
+
+## Required properties:
+  - compatible:		should be "semtech,sx1276", "semtech,sx1277",
+			"semtech,sx1277" or "semtech,sx1279" depends on your
+			transceiver board
+  - spi-max-frequency:	maximal bus speed, should be set something under or
+			equal 10000000 Hz
+  - reg:		the chipselect index
+  - clock-frequency:	the external crystal oscillator frequency in Hz of the
+			transceiver
+  - center-carrier-frq:	the RF center carrier frequency in Hz
+
+## Optional properties:
+  - rf-bandwidth:	the RF bandwidth in Hz
+  - minimal-RF-channel:	the minimal RF channel number and the value must be with
+			prefix "/bits/ 8" because of being a byte datatype
+  - maximum-RF-channel: the maximum RF channel number and the value must be with
+			prefix "/bits/ 8" because of being a byte datatype
+  - spreading-factor:	the spreading factor of Chirp Spread Spectrum modulation
+
+## Example:
+
+	sx1278@0 {
+		compatible = "semtech,sx1278";
+		spi-max-frequency = <15200>;
+		reg = <0>;
+		clock-frequency = <32000000>;
+		center-carrier-frq = <434000000>;
+		minimal-RF-channel = /bits/ 8 <11>;
+		maximum-RF-channel = /bits/ 8 <11>;
+	};

utils/lora/overlay/rpi-lora-spi-overlay.dts

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+/dts-v1/;
+/plugin/;
+
+/ {
+	fragment@0 {
+		target = <&spi>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			spidev@0 {
+				status = "disabled";
+			};
+
+			spidev@1 {
+				status = "disabled";
+			};
+
+			sx1278@0 {
+				compatible = "sx1278";
+				reg = <0>;
+				status = "okay";
+				spi-max-frequency = <0x3b60>;
+				center-carrier-frq = <434000000>;
+				clock-frequency = <32000000>;
+				minimal-RF-channel = /bits/ 8 <11>;
+				maximum-RF-channel = /bits/ 8 <11>;
+			};
+
+			sx1278@1 {
+				compatible = "sx1278";
+				reg = <1>;
+				status = "okay";
+				spi-max-frequency = <0x3b60>;
+				center-carrier-frq = <434000000>;
+				clock-frequency = <32000000>;
+				minimal-RF-channel = /bits/ 8 <11>;
+				maximum-RF-channel = /bits/ 8 <11>;
+			};
+		};
+	};
+};