pinctrl: Add support for the Lantic PEF2256 pinmux

The Lantiq PEF2256 is a framer and line interface component designed to
fulfill all required interfacing between an analog E1/T1/J1 line and the
digital PCM system highway/H.100 bus.

This kind of component can be found in old telecommunication system.
It was used to digital transmission of many simultaneous telephone calls
by time-division multiplexing. Also using HDLC protocol, WAN networks
can be reached through the framer.

This pinmux support handles the pin muxing part (pins RP(A..D) and pins
XP(A..D)) of the PEF2256.
Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20231128132534.258459-5-herve.codina@bootlin.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/Kconfig

@@ -366,6 +366,21 @@ config PINCTRL_PALMAS
 	  open drain configuration for the Palmas series devices like
 	  TPS65913, TPS80036 etc.
 
+config PINCTRL_PEF2256
+	tristate "Lantiq PEF2256 (FALC56) pin controller driver"
+	depends on OF && FRAMER_PEF2256
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+	help
+	  This option enables the pin controller support for the Lantiq PEF2256
+	  framer, also known as FALC56.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called pinctrl-pef2256.
+
 config PINCTRL_PIC32
 	bool "Microchip PIC32 pin controller driver"
 	depends on OF

drivers/pinctrl/Makefile

@@ -39,6 +39,7 @@ obj-$(CONFIG_PINCTRL_MICROCHIP_SGPIO)	+= pinctrl-microchip-sgpio.o
 obj-$(CONFIG_PINCTRL_MLXBF3)	+= pinctrl-mlxbf3.o
 obj-$(CONFIG_PINCTRL_OCELOT)	+= pinctrl-ocelot.o
 obj-$(CONFIG_PINCTRL_PALMAS)	+= pinctrl-palmas.o
+obj-$(CONFIG_PINCTRL_PEF2256)	+= pinctrl-pef2256.o
 obj-$(CONFIG_PINCTRL_PIC32)	+= pinctrl-pic32.o
 obj-$(CONFIG_PINCTRL_PISTACHIO)	+= pinctrl-pistachio.o
 obj-$(CONFIG_PINCTRL_RK805)	+= pinctrl-rk805.o