soc: arm: st_stm32: add support for STM32L422Xb

Add support for the STM32L422Xb SoC. Base stm32l422.dtsi on
stm32l412.dtsi to be able to add the crypto device later.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

dts/arm/st/l4/stm32l412.dtsi

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2020 Aurelien Jarno
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <st/l4/stm32l4.dtsi>
+
+/ {
+	soc {
+		usb: usb@40006800 {
+			compatible = "st,stm32-usb";
+			reg = <0x40006800 0x40000>;
+			interrupts = <67 0>;
+			interrupt-names = "usb";
+			num-bidir-endpoints = <8>;
+			ram-size = <1024>;
+			phys = <&usb_fs_phy>;
+			clocks = <&rcc STM32_CLOCK_BUS_APB1 0x04000000>;
+			status = "disabled";
+			label = "USB";
+		};
+	};
+
+	usb_fs_phy: usbphy {
+		compatible = "usb-nop-xceiv";
+		#phy-cells = <0>;
+		label = "USB_FS_PHY";
+	};
+};

dts/arm/st/l4/stm32l422.dtsi

@@ -0,0 +1,7 @@
+/*
+ * Copyright (c) 2020 Aurelien Jarno
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <st/l4/stm32l412.dtsi>

dts/arm/st/l4/stm32l422Xb.dtsi

@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2020 Aurelien Jarno
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <mem.h>
+#include <st/l4/stm32l422.dtsi>
+
+/ {
+	sram0: memory@20000000 {
+		reg = <0x20000000 DT_SIZE_K(40)>;
+	};
+
+	soc {
+		flash-controller@40022000 {
+			flash0: flash@8000000 {
+				reg = <0x08000000 DT_SIZE_K(128)>;
+			};
+		};
+	};
+};

soc/arm/st_stm32/stm32l4/Kconfig.defconfig.stm32l422xx

@@ -0,0 +1,18 @@
+# ST Microelectronics STM32L422XX MCU
+
+# Copyright (c) 2020 Aurelien Jarno
+# SPDX-License-Identifier: Apache-2.0
+
+if SOC_STM32L422XX
+
+config SOC
+	default "stm32l422xx"
+
+config NUM_IRQS
+	default 83
+
+config GPIO_STM32_PORTH
+	default y
+	depends on GPIO_STM32
+
+endif # SOC_STM32L422XX

soc/arm/st_stm32/stm32l4/Kconfig.soc

@@ -16,6 +16,9 @@ config SOC_STM32L476XX
 config SOC_STM32L496XX
 	bool "STM32L496XX"
 
+config SOC_STM32L422XX
+	bool "STM32L422XX"
+
 config SOC_STM32L432XX
 	bool "STM32L432XX"