pinctrl: bcm: add driver for BCM4908 pinmux

BCM4908 has its own pins layout so it needs a custom binding and a Linux
driver.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20220124102243.14912-2-zajec5@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

MAINTAINERS

@@ -3694,6 +3694,7 @@ M:	bcm-kernel-feedback-list@broadcom.com
 L:	linux-gpio@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/pinctrl/brcm,bcm4908-pinctrl.yaml
+F:	drivers/pinctrl/bcm/pinctrl-bcm4908.c
 
 BROADCOM BCM5301X ARM ARCHITECTURE
 M:	Florian Fainelli <f.fainelli@gmail.com>

drivers/pinctrl/bcm/Kconfig

@@ -29,6 +29,20 @@ config PINCTRL_BCM2835
 	help
 	   Say Y here to enable the Broadcom BCM2835 GPIO driver.
 
+config PINCTRL_BCM4908
+	tristate "Broadcom BCM4908 pinmux driver"
+	depends on OF && (ARCH_BCM4908 || COMPILE_TEST)
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+	select GENERIC_PINCTRL_GROUPS
+	select GENERIC_PINMUX_FUNCTIONS
+	default ARCH_BCM4908
+	help
+	  Driver for BCM4908 family SoCs with integrated pin controller.
+
+	  If compiled as module it will be called pinctrl-bcm4908.
+
 config PINCTRL_BCM63XX
 	bool
 	select PINMUX

drivers/pinctrl/bcm/Makefile

@@ -3,6 +3,7 @@
 
 obj-$(CONFIG_PINCTRL_BCM281XX)		+= pinctrl-bcm281xx.o
 obj-$(CONFIG_PINCTRL_BCM2835)		+= pinctrl-bcm2835.o
+obj-$(CONFIG_PINCTRL_BCM4908)		+= pinctrl-bcm4908.o
 obj-$(CONFIG_PINCTRL_BCM63XX)		+= pinctrl-bcm63xx.o
 obj-$(CONFIG_PINCTRL_BCM6318)		+= pinctrl-bcm6318.o
 obj-$(CONFIG_PINCTRL_BCM6328)		+= pinctrl-bcm6328.o