pinctrl: pistachio: Make it as an option

So it will be avilable for generic MIPS kernel.

--

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
v3: Depend on OF as well
Link: https://lore.kernel.org/r/20210721030134.10562-7-jiaxun.yang@flygoat.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index f38f128..eb98171 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -248,12 +248,15 @@
 	  - 16 bits: sx1509q, sx1506q
 
 config PINCTRL_PISTACHIO
-	def_bool y if MACH_PISTACHIO
+	bool "IMG Pistachio SoC pinctrl driver"
+	depends on OF && (MIPS || COMPILE_TEST)
 	depends on GPIOLIB
 	select PINMUX
 	select GENERIC_PINCONF
 	select GPIOLIB_IRQCHIP
 	select OF_GPIO
+    help
+	  This support pinctrl and gpio driver for IMG Pistachio SoC.
 
 config PINCTRL_ST
 	bool