[PATCH -next] pinctrl: sprd: fix build errors and dependencies

[Randy Dunlap]

From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

Fix build errors when CONFIG_OF is not enabled.
Also, the pinctrl-sprd-sc9860 driver uses functions from the pinctrl-sprd
driver, so the former should depend on the latter driver.

../drivers/pinctrl/sprd/pinctrl-sprd.c: In function 'sprd_dt_node_to_map':
../drivers/pinctrl/sprd/pinctrl-sprd.c:290:2: error: implicit declaration of function 'pinconf_generic_parse_dt_config' [-Werror=implicit-function-declaration]
  ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
  ^
../drivers/pinctrl/sprd/pinctrl-sprd.c: At top level:
../drivers/pinctrl/sprd/pinctrl-sprd.c:844:44: error: array type has incomplete element type
 static const struct pinconf_generic_params sprd_dt_params[] = {
                                            ^
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Baolin Wang <baolin.wang@xxxxxxxxxxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: linux-gpio@xxxxxxxxxxxxxxx
---
 drivers/pinctrl/sprd/Kconfig |    2 ++
 1 file changed, 2 insertions(+)

Why are these drivers not buildable as loadable modules?
I.e., why bool instead of tristate?

--- linux-next-20170904.orig/drivers/pinctrl/sprd/Kconfig
+++ linux-next-20170904/drivers/pinctrl/sprd/Kconfig
@@ -8,10 +8,12 @@ config PINCTRL_SPRD
 	select PINCONF
 	select GENERIC_PINCONF
 	select GENERIC_PINMUX_FUNCTIONS
+	depends on OF
 	help
 	  Say Y here to enable Spreadtrum pinctrl driver
 
 config PINCTRL_SPRD_SC9860
 	bool "Spreadtrum SC9860 pinctrl driver"
+	depends on PINCTRL_SPRD
 	help
 	  Say Y here to enable Spreadtrum SC9860 pinctrl driver