pinctrl: Add driver for the T-Head TH1520 SoC

Add pinctrl driver for the T-Head TH1520 RISC-V SoC.

Tested-by: Thomas Bonnefille <thomas.bonnefille@bootlin.com>
Signed-off-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
[dfustini: use thead,pad-group to identify the pin controller instance]
Signed-off-by: Drew Fustini <dfustini@tenstorrent.com>
Link: https://lore.kernel.org/20240930-th1520-pinctrl-v3-2-32cea2bdbecb@tenstorrent.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

MAINTAINERS

@@ -19945,6 +19945,7 @@ F:	Documentation/devicetree/bindings/clock/thead,th1520-clk-ap.yaml
 F:	Documentation/devicetree/bindings/pinctrl/thead,th1520-pinctrl.yaml
 F:	arch/riscv/boot/dts/thead/
 F:	drivers/clk/thead/clk-th1520-ap.c
+F:	drivers/pinctrl/pinctrl-th1520.c
 F:	include/dt-bindings/clock/thead,th1520-clk-ap.h
 
 RNBD BLOCK DRIVERS

drivers/pinctrl/Kconfig

@@ -551,6 +551,19 @@ config PINCTRL_TPS6594
 	  This driver can also be built as a module
 	  called tps6594-pinctrl.
 
+config PINCTRL_TH1520
+	tristate "Pinctrl driver for the T-Head TH1520 SoC"
+	depends on ARCH_THEAD || COMPILE_TEST
+	select GENERIC_PINMUX_FUNCTIONS
+	select GENERIC_PINCONF
+	select PINMUX
+	help
+	  This is the driver for the pin controller blocks on the
+	  T-Head TH1520 SoC.
+
+	  This driver is needed for RISC-V development boards like
+	  the BeagleV Ahead and the LicheePi 4A.
+
 config PINCTRL_ZYNQ
 	bool "Pinctrl driver for Xilinx Zynq"
 	depends on ARCH_ZYNQ

drivers/pinctrl/Makefile

@@ -54,6 +54,7 @@ obj-$(CONFIG_PINCTRL_STMFX) 	+= pinctrl-stmfx.o
 obj-$(CONFIG_PINCTRL_SX150X)	+= pinctrl-sx150x.o
 obj-$(CONFIG_PINCTRL_TB10X)	+= pinctrl-tb10x.o
 obj-$(CONFIG_PINCTRL_TPS6594)	+= pinctrl-tps6594.o
+obj-$(CONFIG_PINCTRL_TH1520)	+= pinctrl-th1520.o
 obj-$(CONFIG_PINCTRL_ZYNQMP)	+= pinctrl-zynqmp.o
 obj-$(CONFIG_PINCTRL_ZYNQ)	+= pinctrl-zynq.o