pinctrl: Add STM32F746 MCU support

This patch which adds STM32F746 pinctrl and GPIO support, relies on the
generic STM32 pinctrl driver.

Signed-off-by: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/stm32/Kconfig

@@ -13,4 +13,10 @@ config PINCTRL_STM32F429
 	default MACH_STM32F429
 	select PINCTRL_STM32
 
+config PINCTRL_STM32F746
+	bool "STMicroelectronics STM32F746 pin control" if COMPILE_TEST && !MACH_STM32F746
+	depends on OF
+	default MACH_STM32F746
+	select PINCTRL_STM32
+
 endif

drivers/pinctrl/stm32/Makefile

@@ -3,3 +3,4 @@ obj-$(CONFIG_PINCTRL_STM32) += pinctrl-stm32.o
 
 # SoC Drivers
 obj-$(CONFIG_PINCTRL_STM32F429)	+= pinctrl-stm32f429.o
+obj-$(CONFIG_PINCTRL_STM32F746)	+= pinctrl-stm32f746.o