pinctrl: add pinctrl/GPIO driver for Apple SoCs

This driver adds support for the pinctrl / GPIO hardware found
on some Apple SoCs.

Co-developed-by: Stan Skowronek <[email protected]>
Signed-off-by: Stan Skowronek <[email protected]>
Signed-off-by: Joey Gouly <[email protected]>
Acked-by: Hector Martin <[email protected]>
Reviewed-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>

Author: jgouly

drivers/pinctrl/Kconfig

@@ -31,6 +31,22 @@ config DEBUG_PINCTRL
 	help
 	  Say Y here to add some extra checks and diagnostics to PINCTRL calls.
 
+config PINCTRL_APPLE_GPIO
+	tristate "Apple SoC GPIO pin controller driver"
+	depends on ARCH_APPLE
+	select PINMUX
+	select GPIOLIB
+	select GPIOLIB_IRQCHIP
+	select GENERIC_PINCTRL_GROUPS
+	select GENERIC_PINMUX_FUNCTIONS
+	select OF_GPIO
+	help
+	  This is the driver for the GPIO controller found on Apple ARM SoCs,
+	  including M1.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called pinctrl-apple-gpio.
+
 config PINCTRL_ARTPEC6
 	bool "Axis ARTPEC-6 pin controller driver"
 	depends on MACH_ARTPEC6

drivers/pinctrl/Makefile

@@ -8,6 +8,7 @@ obj-$(CONFIG_PINMUX)		+= pinmux.o
 obj-$(CONFIG_PINCONF)		+= pinconf.o
 obj-$(CONFIG_OF)		+= devicetree.o
 obj-$(CONFIG_GENERIC_PINCONF)	+= pinconf-generic.o
+obj-$(CONFIG_PINCTRL_APPLE_GPIO) += pinctrl-apple-gpio.o
 obj-$(CONFIG_PINCTRL_ARTPEC6)	+= pinctrl-artpec6.o
 obj-$(CONFIG_PINCTRL_AS3722)	+= pinctrl-as3722.o
 obj-$(CONFIG_PINCTRL_AXP209)	+= pinctrl-axp209.o