boards: stm32l562e_dk: add support for I2C

Add i2c1 interface for stm32l552xx and stm32l562xx microcontrollers
and enable i2c1 that connects to lsm6dso sensor module on the
stm32l562e_dk board.

Signed-off-by: Yestin Sun <sunyi0804@gmail.com>

boards/arm/stm32l562e_dk/doc/index.rst

@@ -162,6 +162,8 @@ The Zephyr stm32l562e_dk board configuration supports the following hardware fea
 +-----------+------------+-------------------------------------+
 | GPIO      | on-chip    | gpio                                |
 +-----------+------------+-------------------------------------+
+| I2C       | on-chip    | i2c                                 |
++-----------+------------+-------------------------------------+
 
 Other hardware features are not yet supported on this Zephyr port.
 
@@ -181,6 +183,7 @@ Default Zephyr Peripheral Mapping:
 ----------------------------------
 
 - USART_1 TX/RX : PA9/PA10
+- I2C_1 SCL/SDA : PB6/PB7
 - USER_PB : PC13
 - LD10 : PG12
 

boards/arm/stm32l562e_dk/stm32l562e_dk.yaml

@@ -7,5 +7,7 @@ toolchain:
   - gnuarmemb
 supported:
   - gpio
+  - i2c
+  - lsm6dso
 ram: 192
 flash: 512

boards/arm/stm32l562e_dk/stm32l562e_dk_common.dtsi

@@ -35,3 +35,16 @@
 	current-speed = <115200>;
 	status = "okay";
 };
+
+&i2c1 {
+	pinctrl-0 = <&i2c1_scl_pb6 &i2c1_sda_pb7>;
+	status = "okay";
+	clock-frequency = <I2C_BITRATE_FAST>;
+
+	lsm6dso@6a {
+		compatible = "st,lsm6dso";
+		reg = <0x6a>;
+		irq-gpios = <&gpiof 3 GPIO_ACTIVE_HIGH>;
+		label = "LSM6DSO";
+	};
+};

dts/arm/st/l5/stm32l5.dtsi

@@ -8,6 +8,7 @@
 #include <arm/armv8-m.dtsi>
 #include <dt-bindings/clock/stm32_clock.h>
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/i2c/i2c.h>
 #include <dt-bindings/pwm/pwm.h>
 
 / {
@@ -190,6 +191,19 @@
 			status = "disabled";
 			label = "LPUART_1";
 		};
+
+		i2c1: i2c@40005400 {
+			compatible = "st,stm32-i2c-v2";
+			clock-frequency = <I2C_BITRATE_STANDARD>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0x40005400 0x400>;
+			clocks = <&rcc STM32_CLOCK_BUS_APB1 0x00200000>;
+			interrupts = <55 0>, <56 0>;
+			interrupt-names = "event", "error";
+			status = "disabled";
+			label= "I2C_1";
+		};
 	};
 };
 

soc/arm/st_stm32/stm32l5/soc.h

@@ -43,6 +43,10 @@
 #include <stm32l5xx_ll_gpio.h>
 #endif
 
+#ifdef CONFIG_I2C_STM32
+#include <stm32l5xx_ll_i2c.h>
+#endif
+
 #ifdef CONFIG_SERIAL_HAS_DRIVER
 #include <stm32l5xx_ll_usart.h>
 #include <stm32l5xx_ll_lpuart.h>