pinctrl: Add Cypress cy8c95x0 support

Add support for cypress I2C GPIO expanders cy8c9520, cy8c9540 and
cy8c9560. The GPIO expanders feature a PWM mode, thus add it as
pinctrl driver.

The chip features multiple drive modes for each pin when configured
as output and multiple bias settings when configured as input.

Tested all three components and verified that all functionality
is fully working.

Datasheet: https://www.cypress.com/file/37971/download
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: Naresh Solanki <naresh.solanki@9elements.com>
Link: https://lore.kernel.org/r/20220816054917.7893-3-patrick.rudolph@9elements.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

MAINTAINERS

@@ -5629,6 +5629,12 @@ Q:	http://patchwork.linuxtv.org/project/linux-media/list/
 T:	git git://linuxtv.org/anttip/media_tree.git
 F:	drivers/media/common/cypress_firmware*
 
+CYPRESS CY8C95X0 PINCTRL DRIVER
+M:	Patrick Rudolph <patrick.rudolph@9elements.com>
+L:	linux-gpio@vger.kernel.org
+S:	Maintained
+F:	drivers/pinctrl/pinctrl-cy8c95x0.c
+
 CYPRESS CY8CTMA140 TOUCHSCREEN DRIVER
 M:	Linus Walleij <linus.walleij@linaro.org>
 L:	linux-input@vger.kernel.org

drivers/pinctrl/Kconfig

@@ -135,6 +135,20 @@ config PINCTRL_BM1880
 	help
 	  Pinctrl driver for Bitmain BM1880 SoC.
 
+config PINCTRL_CY8C95X0
+	tristate "Cypress CY8C95X0 I2C pinctrl and GPIO driver"
+	depends on I2C && OF
+	select GPIOLIB
+	select GPIOLIB_IRQCHIP
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+	select REGMAP_I2C
+	help
+	  Support for 20/40/60 pin Cypress Cy8C95x0 pinctrl/gpio I2C expander.
+	  This driver can also be built as a module. If so, the module will be
+	  called pinctrl-cy8c95x0.
+
 config PINCTRL_DA850_PUPD
 	tristate "TI DA850/OMAP-L138/AM18XX pull-up and pull-down groups"
 	depends on OF && (ARCH_DAVINCI_DA850 || COMPILE_TEST)

drivers/pinctrl/Makefile

@@ -17,6 +17,7 @@ obj-$(CONFIG_PINCTRL_AT91)	+= pinctrl-at91.o
 obj-$(CONFIG_PINCTRL_AT91PIO4)	+= pinctrl-at91-pio4.o
 obj-$(CONFIG_PINCTRL_AXP209)	+= pinctrl-axp209.o
 obj-$(CONFIG_PINCTRL_BM1880)	+= pinctrl-bm1880.o
+obj-$(CONFIG_PINCTRL_CY8C95X0)	+= pinctrl-cy8c95x0.o
 obj-$(CONFIG_PINCTRL_DA850_PUPD) += pinctrl-da850-pupd.o
 obj-$(CONFIG_PINCTRL_DA9062)	+= pinctrl-da9062.o
 obj-$(CONFIG_PINCTRL_DIGICOLOR)	+= pinctrl-digicolor.o