boards: stm: Add CAN support for stm32f072b micro controller

This commit adds the can device to the stm32f072b device tree and pinmux

Signed-off-by: Alexander Wachter <[email protected]>

Author: Alexander Wachter

arch/arm/soc/st_stm32/stm32f0/dts.fixup

@@ -36,6 +36,12 @@
 #define CONFIG_SPI_2_NAME			ST_STM32_SPI_FIFO_40003800_LABEL
 #define CONFIG_SPI_2_IRQ			ST_STM32_SPI_FIFO_40003800_IRQ_0
 
+#define CONFIG_CAN_1_BASE_ADDRESS		ST_STM32_CAN_40006400_BASE_ADDRESS
+#define CONFIG_CAN_1_BUS_SPEED			ST_STM32_CAN_40006400_BUS_SPEED
+#define CONFIG_CAN_1_NAME			ST_STM32_CAN_40006400_LABEL
+#define CONFIG_CAN_1_IRQ			ST_STM32_CAN_40006400_IRQ_0
+#define CONFIG_CAN_1_IRQ_PRIORITY		ST_STM32_CAN_40006400_IRQ_0_PRIORITY
+
 #define FLASH_DEV_BASE_ADDRESS		        ST_STM32F0_FLASH_CONTROLLER_40022000_BASE_ADDRESS
 #define FLASH_DEV_NAME			        ST_STM32F0_FLASH_CONTROLLER_40022000_LABEL
 

boards/arm/stm32f072b_disco/pinmux.c

@@ -32,6 +32,11 @@ static const struct pin_config pinconf[] = {
 	{STM32_PIN_PB4, STM32F0_PINMUX_FUNC_PB4_SPI1_MISO},
 	{STM32_PIN_PB5, STM32F0_PINMUX_FUNC_PB5_SPI1_MOSI},
 #endif /* CONFIG_SPI_1 */
+#ifdef CONFIG_CAN_1
+	{STM32_PIN_PB8, STM32F0_PINMUX_FUNC_PB8_CAN_RX},
+	{STM32_PIN_PB9, STM32F0_PINMUX_FUNC_PB9_CAN_TX},
+#endif /* CONFIG_CAN_1 */
+
 };
 
 static int pinmux_stm32_init(struct device *port)

boards/arm/stm32f072b_disco/stm32f072b_disco.dts

@@ -74,3 +74,10 @@
 &spi1 {
 	status = "ok";
 };
+
+&can1 {
+	pinctrl-0 = <&can_pins_a>;
+	pinctrl-names = "default";
+	bus-speed = <250000>;
+	status = "ok";
+};

drivers/pinmux/stm32/pinmux_stm32f0.h

@@ -88,4 +88,13 @@
 #define STM32F0_PINMUX_FUNC_PC3_SPI2_MOSI \
 	(STM32_PINMUX_ALT_FUNC_0 | STM32_PUSHPULL_NOPULL)
 
+#define STM32F0_PINMUX_FUNC_PB8_CAN_RX \
+	(STM32_PINMUX_ALT_FUNC_4 | STM32_PUSHPULL_NOPULL)
+#define STM32F0_PINMUX_FUNC_PB9_CAN_TX \
+	(STM32_PINMUX_ALT_FUNC_4 | STM32_PUSHPULL_NOPULL)
+#define STM32F0_PINMUX_FUNC_PD0_CAN_RX \
+	(STM32_PINMUX_ALT_FUNC_0 | STM32_PUPDR_PULL_UP)
+#define STM32F0_PINMUX_FUNC_PD1_CAN_TX \
+	(STM32_PINMUX_ALT_FUNC_0 | STM32_PUSHPULL_NOPULL)
+
 #endif /* _STM32F0_PINMUX_H_ */

dts/arm/st/stm32f0-pinctrl.dtsi

@@ -39,6 +39,18 @@
 					tx = <STM32_PIN_PD5 (STM32_PINMUX_ALT_FUNC_0 | STM32_PUSHPULL_NOPULL)>;
 				};
 			};
+			can_pins_a: can@0 {
+				rx_tx {
+					rx = <STM32_PIN_PB8 (STM32_PINMUX_ALT_FUNC_4 | STM32_PUPDR_PULL_UP)>;
+					tx = <STM32_PIN_PB9 (STM32_PINMUX_ALT_FUNC_4 | STM32_PUPDR_NO_PULL)>;
+				};
+			};
+			can_pins_b: can@1 {
+				rx_tx {
+					rx = <STM32_PIN_PD0 (STM32_PINMUX_ALT_FUNC_0 | STM32_PUPDR_PULL_UP)>;
+					tx = <STM32_PIN_PD1 (STM32_PINMUX_ALT_FUNC_0 | STM32_PUPDR_NO_PULL)>;
+				};
+			};
 		};
 	};
 };

dts/arm/st/stm32f072.dtsi

@@ -42,5 +42,15 @@
 			status = "disabled";
 			label= "USB";
 		};
+
+		can1: can@40006400 {
+			compatible = "st,stm32-can";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0x40006400 0x400>;
+			interrupts = <30 0>;
+			status = "disabled";
+			label = "CAN_1";
+		};
 	};
 };