pinctrl: Add Intel Thunder Bay pinctrl driver

About Intel Thunder Bay:
-----------------------
Intel Thunder Bay is a computer vision AI accelerator SoC based on ARM CPU.

Pinctrl IP:
----------
The SoC has a customised pinmux controller IP which controls pin
multiplexing and configuration.

Thunder Bay pinctrl IP is not based on and have nothing in common with the
existing pinctrl drivers. The registers used are incompatible with the
existing drivers, so it requires a new driver.

Add pinctrl driver to enable pin control support in the Intel Thunder Bay
SoC.

Co-developed-by: Kiran Kumar S <kiran.kumar1.s@intel.com>
Signed-off-by: Kiran Kumar S <kiran.kumar1.s@intel.com>
Signed-off-by: Lakshmi Sowjanya D <lakshmi.sowjanya.d@intel.com>
Link: https://lore.kernel.org/r/20211201072626.19599-3-lakshmi.sowjanya.d@intel.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Author: Lakshmi-Sowjanya

drivers/pinctrl/Kconfig

@@ -499,4 +499,23 @@ config PINCTRL_EQUILIBRIUM
 	  pin functions, configure GPIO attributes for LGM SoC pins. Pinmux and
 	  pinconf settings are retrieved from device tree.
 
+config PINCTRL_THUNDERBAY
+	tristate "Generic pinctrl and GPIO driver for Intel Thunder Bay SoC"
+	depends on ARCH_THUNDERBAY || (ARM64 && COMPILE_TEST)
+	depends on HAS_IOMEM
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+	select GENERIC_PINCTRL_GROUPS
+	select GENERIC_PINMUX_FUNCTIONS
+	select GPIOLIB
+	select GPIOLIB_IRQCHIP
+	select GPIO_GENERIC
+	help
+	  This selects pin control driver for the Intel Thunder Bay SoC.
+	  It provides pin config functions such as pullup, pulldown,
+	  interrupt, drive strength, sec lock, schmitt trigger, slew
+	  rate control and direction control. This module will be
+	  called as pinctrl-thunderbay.
+
 endif

drivers/pinctrl/Makefile

@@ -49,6 +49,7 @@ obj-$(CONFIG_PINCTRL_MICROCHIP_SGPIO)	+= pinctrl-microchip-sgpio.o
 obj-$(CONFIG_PINCTRL_EQUILIBRIUM)   += pinctrl-equilibrium.o
 obj-$(CONFIG_PINCTRL_K210)	+= pinctrl-k210.o
 obj-$(CONFIG_PINCTRL_KEEMBAY)	+= pinctrl-keembay.o
+obj-$(CONFIG_PINCTRL_THUNDERBAY) += pinctrl-thunderbay.o
 
 obj-y				+= actions/
 obj-$(CONFIG_ARCH_ASPEED)	+= aspeed/