soc: arm: nxp: Add LPC55S28 support

Add initial support for NXP LPC55S28.

Signed-off-by: Christian Taedcke <christian.taedcke@lemonbeat.com>

soc/arm/nxp_lpc/lpc55xxx/Kconfig.defconfig.lpc55S28

@@ -0,0 +1,39 @@
+# NXP LPC55S28 platform configuration options
+
+# Copyright (c) 2020 Lemonbeat GmbH
+# SPDX-License-Identifier: Apache-2.0
+
+if SOC_LPC55S28
+
+config SOC
+	default "lpc55S28"
+
+config PINMUX_MCUX_LPC
+	default y
+	depends on PINMUX
+
+config GPIO_MCUX_LPC
+	default y
+	depends on GPIO
+
+config UART_MCUX_FLEXCOMM
+	default y
+	depends on SERIAL
+
+config SOC_FLASH_MCUX
+	default y
+	depends on FLASH
+
+config WDT_MCUX_WWDT
+	default y
+	depends on WATCHDOG
+
+config ADC_MCUX_LPADC
+	default y
+	depends on ADC
+
+config DMA_MCUX_LPC
+	default y
+	depends on DMA
+
+endif # SOC_LPC55S28

soc/arm/nxp_lpc/lpc55xxx/Kconfig.soc

@@ -18,6 +18,19 @@ config SOC_LPC55S16
 	select CLOCK_CONTROL
 	select HAS_MCUX_IAP if !TRUSTED_EXECUTION_NONSECURE
 
+config SOC_LPC55S28
+	bool "SOC_LPC55S28 M33"
+	select CPU_CORTEX_M33
+	select CPU_HAS_ARM_SAU
+	select CPU_HAS_ARM_MPU
+	select CPU_HAS_FPU
+	select ARMV8_M_DSP
+	select ARM_TRUSTZONE_M
+	select CLOCK_CONTROL
+	select HAS_MCUX_IAP
+	select HAS_MCUX_LPADC
+	select HAS_MCUX_LPC_DMA
+
 config SOC_LPC55S69_CPU0
 	bool "SOC_LPC55S69 M33 [CPU 0]"
 	select CPU_CORTEX_M33
@@ -42,6 +55,9 @@ if SOC_SERIES_LPC55XXX
 config SOC_PART_NUMBER_LPC55S16JBD100
 	bool
 
+config SOC_PART_NUMBER_LPC55S28JBD100
+	bool
+
 config SOC_PART_NUMBER_LPC55S69JBD100
 	bool
 
@@ -51,6 +67,7 @@ config SOC_PART_NUMBER_LPC55S69JET98
 config SOC_PART_NUMBER_LPC55XXX
 	string
 	default "LPC55S16JBD100" if SOC_PART_NUMBER_LPC55S16JBD100
+	default "LPC55S28JBD100" if SOC_PART_NUMBER_LPC55S28JBD100
 	default "LPC55S69JBD100" if SOC_PART_NUMBER_LPC55S69JBD100
 	default "LPC55S69JET98"  if SOC_PART_NUMBER_LPC55S69JET98
 

soc/arm/nxp_lpc/lpc55xxx/soc.c

@@ -36,7 +36,8 @@
 
 static ALWAYS_INLINE void clock_init(void)
 {
-#if defined(CONFIG_SOC_LPC55S16) || defined(CONFIG_SOC_LPC55S69_CPU0)
+#if defined(CONFIG_SOC_LPC55S16) || defined(CONFIG_SOC_LPC55S28) || \
+	defined(CONFIG_SOC_LPC55S69_CPU0)
     /*!< Set up the clock sources */
     /*!< Configure FRO192M */
 	/*!< Ensure FRO is on  */