gpio: npcm: Add support for Nuvoton NPCM SoCs

Add Nuvoton BMC NPCM7xx/NPCM8xx gpio driver

Signed-off-by: Stanley Chu <yschu@nuvoton.com>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 886cdbc..149a62f 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -279,6 +279,13 @@
 	help
 	  Support GPIO controllers on i.MX23 and i.MX28 platforms
 
+config NPCM_GPIO
+	bool "Nuvoton NPCM GPIO driver"
+	depends on DM_GPIO
+	help
+	  Support GPIO controllers on Nuvovon NPCM SoCs.
+	  NPCM7xx/NPCM8xx contain 8 GPIO banks, each bank contains 32 pins.
+
 config OMAP_GPIO
 	bool "TI OMAP GPIO driver"
 	depends on ARCH_OMAP2PLUS