pinctrl: hide subsystem from the populace

Machines that have embedded pin controllers need to select them
explicitly, so why broadcast their config options to menuconfig.
We provide a helpful submenu for those machines that do select
it, making it possible to enable debugging for example.
Reported-by: NLinus Torvalds <torvalds@linux-foundation.org>
Acked-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/Kconfig

@@ -2,23 +2,17 @@
 # PINCTRL infrastructure and drivers
 #
 
-menuconfig PINCTRL
-	bool "PINCTRL Support"
+config PINCTRL
+	bool
 	depends on EXPERIMENTAL
-	help
-	  This enables the PINCTRL subsystem for controlling pins
-	  on chip packages, for example multiplexing pins on primarily
-	  PGA and BGA packages for systems on chip.
-
-	  If unsure, say N.
 
 if PINCTRL
 
+menu "Pin controllers"
+	depends on PINCTRL
+
 config PINMUX
 	bool "Support pinmux controllers"
-	help
-	  Say Y here if you want the pincontrol subsystem to handle pin
-	  multiplexing drivers.
 
 config DEBUG_PINCTRL
 	bool "Debug PINCTRL calls"
@@ -30,14 +24,12 @@ config PINMUX_SIRF
 	bool "CSR SiRFprimaII pinmux driver"
 	depends on ARCH_PRIMA2
 	select PINMUX
-	help
-	  Say Y here to enable the SiRFprimaII pinmux driver
 
 config PINMUX_U300
 	bool "U300 pinmux driver"
 	depends on ARCH_U300
 	select PINMUX
-	help
-	  Say Y here to enable the U300 pinmux driver
+
+endmenu
 
 endif