arch: arm: soc: add STM32L433

The L433 chip is a superset of the L432, just grabbing a few additional
interfaces (LCD, I2C2, USART3, SPI2, SDMMC).  All the support/HAL files
are already there, so enabling these is just a matter of build system
setup.

Tested on an application specific board (builds correctly and I2C2
works.)  I unfortunately don't have a nucleo/discovery board to create a
reference board for.

Signed-off-by: David Lamparter <equinox@diac24.net>

arch/arm/soc/st_stm32/stm32l4/Kconfig.defconfig.stm32l433xx

@@ -0,0 +1,32 @@
+# Kconfig - ST Microelectronics STM32L433XX MCU
+#
+# Copyright (c) 2018 David Lamparter
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+if SOC_STM32L433XC
+
+config SOC
+	string
+	default "stm32l433xx"
+
+config NUM_IRQS
+	int
+	default 83
+
+if GPIO_STM32
+
+config GPIO_STM32_PORTD
+	def_bool y
+
+config GPIO_STM32_PORTE
+	default y
+
+config GPIO_STM32_PORTH
+	default y
+
+endif # GPIO_STM32
+
+endif # SOC_STM32L433XC
+

arch/arm/soc/st_stm32/stm32l4/Kconfig.soc

@@ -19,6 +19,9 @@ config SOC_STM32L496XG
 config SOC_STM32L432XC
 	bool "STM32L432XC"
 
+config SOC_STM32L433XC
+	bool "STM32L433XC"
+
 config SOC_STM32L475XG
 	bool "STM32L475XG"
 

dts/arm/st/mem.h

@@ -121,6 +121,9 @@
 #elif defined(CONFIG_SOC_STM32L432XC)
 #define DT_FLASH_SIZE		__SIZE_K(256)
 #define DT_SRAM_SIZE		__SIZE_K(64)
+#elif defined(CONFIG_SOC_STM32L433XC)
+#define DT_FLASH_SIZE		__SIZE_K(256)
+#define DT_SRAM_SIZE		__SIZE_K(64)
 #else
 #error "Flash, RAM, and CCM sizes not defined for this chip"
 #endif