ARM: npcm: Introduce Nuvoton WPCM450 SoC

The WPCM450 is an older BMC SoC in the Nuvoton NPCM family, originally
marketed as Winbond WPCM450.

Signed-off-by: Jonathan Neuschäfer <[e-mail]>
Reviewed-by: Joel Stanley <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Joel Stanley <[e-mail]>

arch/arm/mach-npcm/Kconfig

···
 # SPDX-License-Identifier: GPL-2.0-only
 menuconfig ARCH_NPCM
 	bool "Nuvoton NPCM Architecture"
-	depends on ARCH_MULTI_V7
+	depends on ARCH_MULTI_V5 || ARCH_MULTI_V7
 	select PINCTRL
 
 if ARCH_NPCM
+
+config ARCH_WPCM450
+	bool "Support for WPCM450 BMC (Hermon)"
+	depends on ARCH_MULTI_V5
+	select CPU_ARM926T
+	select NPCM7XX_TIMER
+	help
+	  General support for WPCM450 BMC (Hermon).
+
+	  Winbond/Nuvoton WPCM450 BMC based on the ARM926EJ-S.
 
 config ARCH_NPCM7XX
 	bool "Support for NPCM7xx BMC (Poleg)"

arch/arm/mach-npcm/Makefile

···
 # SPDX-License-Identifier: GPL-2.0-only
 AFLAGS_headsmp.o		+= -march=armv7-a
 
+obj-$(CONFIG_ARCH_WPCM450)	+= wpcm450.o
 obj-$(CONFIG_ARCH_NPCM7XX)	+= npcm7xx.o
 obj-$(CONFIG_SMP)		+= platsmp.o headsmp.o

arch/arm/mach-npcm/wpcm450.c

···
+// SPDX-License-Identifier: GPL-2.0
+// Copyright 2021 Jonathan Neuschäfer
+
+#include <asm/mach/arch.h>
+
+static const char *const wpcm450_dt_match[] = {
+	"nuvoton,wpcm450",
+	NULL
+};
+
+DT_MACHINE_START(WPCM450_DT, "WPCM450 chip")
+	.dt_compat	= wpcm450_dt_match,
+MACHINE_END