pinctrl: bcm: Add STB family pin controller driver

This driver provide pin muxing and configuration functionality
for BCM2712 SoC used by RPi5. According to [1] this chip is an
instance of the one used in Broadcom STB  product line.

[1] https://lore.kernel.org/lkml/f6601f73-cb22-4ba3-88c5-241be8421fc3@broadcom.com/

Cc: Jonathan Bell <jonathan@raspberrypi.com>
Cc: Phil Elwell <phil@raspberrypi.com>
Signed-off-by: Ivan T. Ivanov <iivanov@suse.de>
Reviewed-by: Phil Elwell <phil@raspberrypi.com>
Signed-off-by: Andrea della Porta <andrea.porta@suse.com>
[linusw: Enable also for ARCH_BCM2835]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Author: hanzyd

drivers/pinctrl/bcm/Kconfig

@@ -106,6 +106,18 @@ config PINCTRL_BCM63268
 	help
 	   Say Y here to enable the Broadcom BCM63268 GPIO driver.
 
+config PINCTRL_BRCMSTB
+        tristate "Broadcom STB product line pin controller driver"
+        depends on OF && (ARCH_BCM2835 || ARCH_BRCMSTB || COMPILE_TEST)
+        select PINMUX
+        select PINCONF
+        select GENERIC_PINCONF
+        help
+          Enable pin muxing and configuration functionality
+          for Broadcom STB product line chipsets.
+
+source "drivers/pinctrl/bcm/Kconfig.stb"
+
 config PINCTRL_IPROC_GPIO
 	bool "Broadcom iProc GPIO (with PINCONF) driver"
 	depends on OF_GPIO && (ARCH_BCM_IPROC || COMPILE_TEST)

drivers/pinctrl/bcm/Kconfig.stb

@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0-only
+if PINCTRL_BRCMSTB
+
+config PINCTRL_BCM2712
+	tristate "BCM2712 SoC pin controller driver"
+	help
+	  Driver for BCM2712 integrated pin controller,
+	  commonly found on Raspberry Pi 5.
+
+endif

drivers/pinctrl/bcm/Makefile

@@ -11,6 +11,8 @@ obj-$(CONFIG_PINCTRL_BCM6358)		+= pinctrl-bcm6358.o
 obj-$(CONFIG_PINCTRL_BCM6362)		+= pinctrl-bcm6362.o
 obj-$(CONFIG_PINCTRL_BCM6368)		+= pinctrl-bcm6368.o
 obj-$(CONFIG_PINCTRL_BCM63268)		+= pinctrl-bcm63268.o
+obj-$(CONFIG_PINCTRL_BRCMSTB)		+= pinctrl-brcmstb.o
+obj-$(CONFIG_PINCTRL_BCM2712)		+= pinctrl-brcmstb-bcm2712.o
 obj-$(CONFIG_PINCTRL_IPROC_GPIO)	+= pinctrl-iproc-gpio.o
 obj-$(CONFIG_PINCTRL_CYGNUS_MUX)	+= pinctrl-cygnus-mux.o
 obj-$(CONFIG_PINCTRL_NS)		+= pinctrl-ns.o