pinctrl: Add pinctrl support for BM1880 SoC

Add pinctrl support for Bitmain BM1880 SoC. The driver only handles
pinmuxing as the SoC is not capable of handling pinconf.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 2764d71..c4ac4bf 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -108,6 +108,13 @@
 	  Requires ACPI/FDT device enumeration code to set up a platform
 	  device.
 
+config PINCTRL_BM1880
+	bool "Bitmain BM1880 Pinctrl driver"
+	depends on ARCH_BITMAIN
+	select PINMUX
+	help
+	  Pinctrl driver for Bitmain BM1880 SoC.
+
 config PINCTRL_DA850_PUPD
 	tristate "TI DA850/OMAP-L138/AM18XX pullup/pulldown groups"
 	depends on OF && (ARCH_DAVINCI_DA850 || COMPILE_TEST)