RFC: Add initial LoRa support

CODEOWNERS

@@ -138,6 +138,7 @@
 /drivers/*/vexriscv_litex.c               @mateusz-holenko @kgugala @pgielda
 /drivers/led/                             @Mani-Sadhasivam
 /drivers/led_strip/                       @mbolivar
+/drivers/lora/                            @Mani-Sadhasivam
 /drivers/modem/                           @mike-scott
 /drivers/pci/                             @gnuless
 /drivers/pcie/                            @gnuless
@@ -254,6 +255,7 @@
 /include/misc/                            @andrewboie @andyross
 /include/net/                             @jukkar @tbursztyka @pfalcon
 /include/net/buf.h                        @jukkar @jhedberg @tbursztyka @pfalcon
+/include/net/lora.h                       @Mani-Sadhasivam
 /include/posix/                           @pfalcon
 /include/power/power.h                    @wentongwu @nashif
 /include/ptp_clock.h                      @jukkar
@@ -287,6 +289,7 @@
 /samples/display/                         @vanwinkeljan
 /samples/drivers/CAN/                     @alexanderwachter
 /samples/drivers/ht16k33/                 @henrikbrixandersen
+/samples/drivers/lora/                    @Mani-Sadhasivam
 /samples/gui/                             @vanwinkeljan
 /samples/net/                             @jukkar @tbursztyka @pfalcon
 /samples/net/dns_resolve/                 @jukkar @tbursztyka @pfalcon

boards/arm/96b_wistrio/96b_wistrio.dts

@@ -58,3 +58,18 @@
 		label = "LIS3DH";
 	};
 };
+
+&spi1 {
+	status = "okay";
+	cs-gpios = <&gpiob 0 0>;
+
+	sx1276@0 {
+		compatible = "semtech,sx1276";
+		reg = <0>;
+		label = "sx1276";
+		reset-gpios = <&gpiob 13 0>;
+		dio-gpios = <&gpioa 11 0>;
+		clock-frequency = <32000000>;
+		spi-max-frequency = <1000000>;
+	};
+};

boards/arm/96b_wistrio/pinmux.c

@@ -4,11 +4,12 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <kernel.h>
 #include <device.h>
+#include <gpio.h>
 #include <init.h>
-#include <drivers/pinmux.h>
-#include <sys/sys_io.h>
+#include <kernel.h>
+#include <pinmux.h>
+#include <sys_io.h>
 
 #include <pinmux/stm32/pinmux_stm32.h>
 
@@ -25,16 +26,53 @@ static const struct pin_config pinconf[] = {
 	{STM32_PIN_PB8, STM32L1X_PINMUX_FUNC_PB8_I2C1_SCL},
 	{STM32_PIN_PB9, STM32L1X_PINMUX_FUNC_PB9_I2C1_SDA},
 #endif /* CONFIG_I2C_1 */
+#ifdef CONFIG_SPI_1
+	{STM32_PIN_PA5, STM32L1X_PINMUX_FUNC_PA5_SPI1_SCK},
+	{STM32_PIN_PA6, STM32L1X_PINMUX_FUNC_PA6_SPI1_MISO},
+	{STM32_PIN_PA7, STM32L1X_PINMUX_FUNC_PA7_SPI1_MOSI},
+#endif /* CONFIG_SPI_1 */
+	{STM32_PIN_PA4, STM32_PUSHPULL_PULLUP},
+	{STM32_PIN_PA11, STM32_PUSHPULL_PULLUP},
+	{STM32_PIN_PB6, STM32_PUSHPULL_PULLUP},
+	{STM32_PIN_PB7, STM32_PUSHPULL_PULLUP},
 };
 
 static int pinmux_stm32_init(struct device *port)
 {
 	ARG_UNUSED(port);
+	struct device *gpioa, *gpiob, *gpioh;
 
 	stm32_setup_pins(pinconf, ARRAY_SIZE(pinconf));
 
+	gpioa = device_get_binding(DT_ST_STM32_GPIO_40020000_LABEL);
+	if (!gpioa) {
+		return -ENODEV;
+	}
+
+	gpiob = device_get_binding(DT_ST_STM32_GPIO_40020400_LABEL);
+	if (!gpiob) {
+		return -ENODEV;
+	}
+
+	gpioh = device_get_binding(DT_ST_STM32_GPIO_40021400_LABEL);
+	if (!gpioh) {
+		return -ENODEV;
+	}
+
+	gpio_pin_configure(gpioa, 4, GPIO_DIR_OUT);
+	gpio_pin_write(gpioa, 4, 1);
+
+	gpio_pin_configure(gpiob, 6, GPIO_DIR_OUT);
+	gpio_pin_write(gpiob, 6, 1);
+
+	gpio_pin_configure(gpiob, 7, GPIO_DIR_OUT);
+	gpio_pin_write(gpiob, 7, 0);
+
+	gpio_pin_configure(gpioh, 1, GPIO_DIR_OUT);
+	gpio_pin_write(gpioh, 1, 1);
+
 	return 0;
 }
 
-SYS_INIT(pinmux_stm32_init, PRE_KERNEL_1,
-	 CONFIG_PINMUX_STM32_DEVICE_INITIALIZATION_PRIORITY);
+/* Need to be initialised after GPIO driver */
+SYS_INIT(pinmux_stm32_init, POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE);

drivers/CMakeLists.txt

@@ -33,6 +33,7 @@ add_subdirectory_if_kconfig(wifi)
 add_subdirectory_if_kconfig(can)
 add_subdirectory_if_kconfig(audio)
 add_subdirectory_if_kconfig(hwinfo)
+add_subdirectory_if_kconfig(lora)
 
 add_subdirectory_ifdef(CONFIG_FLASH_HAS_DRIVER_ENABLED flash)
 add_subdirectory_ifdef(CONFIG_SERIAL_HAS_DRIVER serial)

drivers/Kconfig

@@ -13,6 +13,8 @@ source "drivers/bluetooth/Kconfig"
 
 source "drivers/ieee802154/Kconfig"
 
+source "drivers/lora/Kconfig"
+
 source "drivers/console/Kconfig"
 
 source "drivers/ethernet/Kconfig"

drivers/lora/CMakeLists.txt

@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_sources_ifdef(CONFIG_LORA_SX1276 sx1276.c)

drivers/lora/Kconfig

@@ -0,0 +1,28 @@
+#
+# Copyright (c) 2019 Manivannan Sadhasivam
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+# Top-level configuration file for LORA drivers.
+
+menuconfig LORA
+	bool "LoRa drivers"
+	help
+	  Include LoRa drivers in the system configuration.
+
+if LORA
+
+module = LORA
+module-str = lora
+source "subsys/logging/Kconfig.template.log_config"
+
+config LORA_INIT_PRIORITY
+	int "LoRa initialization priority"
+	default 90
+	help
+	  System initialization priority for LoRa drivers.
+
+source "drivers/lora/Kconfig.sx1276"
+
+endif # LORA

drivers/lora/Kconfig.sx1276

@@ -0,0 +1,33 @@
+#
+# Copyright (c) 2019 Manivannan Sadhasivam
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+menuconfig LORA_SX1276
+	bool "Semtech SX1276 driver"
+	depends on SPI
+	help
+	  Enable LoRa driver for Semtech SX1276.
+
+if LORA_SX1276
+
+choice
+	prompt "SX1276 PA Output pin"
+	default PA_BOOST_PIN
+	help
+	  Antenna connection type.
+
+config PA_RFO_PIN
+	bool "PA_RFO_PIN"
+	help
+	  Antenna connected to PA_RFO pin.
+
+config PA_BOOST_PIN
+	bool "PA_BOOST_PIN"
+	help
+	  Antenna connected to PA_BOOST pin.
+
+endchoice
+
+endif # LORA_SX1276