pinctrl: Add driver for Awinic AW9523/B I2C GPIO Expander

The Awinic AW9523(B) is a multi-function I2C gpio expander in a
TQFN-24L package, featuring PWM (max 37mA per pin, or total max
power 3.2Watts) for LED driving capability.

It has two ports with 8 pins per port (for a total of 16 pins),
configurable as either PWM with 1/256 stepping or GPIO input/output,
1.8V logic input; each GPIO can be configured as input or output
independently from each other.

This IC also has an internal interrupt controller, which is capable
of generating an interrupt for each GPIO, depending on the
configuration, and will raise an interrupt on the INTN pin to
advertise this to an external interrupt controller.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Signed-off-by: David Bauer <mail@david-bauer.net>
Link: https://lore.kernel.org/r/20210624214458.68716-2-mail@david-bauer.netAcked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20240301-awinic-aw9523-v8-1-7ec572f5dfb4@linaro.org

drivers/pinctrl/Kconfig

@@ -127,6 +127,24 @@ config PINCTRL_AXP209
 	  selected.
 	  Say Y to enable pinctrl and GPIO support for the AXP209 PMIC.
 
+config PINCTRL_AW9523
+	bool "Awinic AW9523/AW9523B I2C GPIO expander pinctrl driver"
+	depends on OF && I2C
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+	select GPIOLIB
+	select GPIOLIB_IRQCHIP
+	select REGMAP
+	select REGMAP_I2C
+	help
+	  The Awinic AW9523/AW9523B is a multi-function I2C GPIO
+	  expander with PWM functionality. This driver bundles a
+	  pinctrl driver to select the function muxing and a GPIO
+	  driver to handle GPIO, when the GPIO function is selected.
+
+	  Say yes to enable pinctrl and GPIO support for the AW9523(B).
+
 config PINCTRL_BM1880
 	bool "Bitmain BM1880 Pinctrl driver"
 	depends on OF && (ARCH_BITMAIN || COMPILE_TEST)

drivers/pinctrl/Makefile

@@ -15,6 +15,7 @@ obj-$(CONFIG_PINCTRL_ARTPEC6)	+= pinctrl-artpec6.o
 obj-$(CONFIG_PINCTRL_AS3722)	+= pinctrl-as3722.o
 obj-$(CONFIG_PINCTRL_AT91)	+= pinctrl-at91.o
 obj-$(CONFIG_PINCTRL_AT91PIO4)	+= pinctrl-at91-pio4.o
+obj-$(CONFIG_PINCTRL_AW9523)	+= pinctrl-aw9523.o
 obj-$(CONFIG_PINCTRL_AXP209)	+= pinctrl-axp209.o
 obj-$(CONFIG_PINCTRL_BM1880)	+= pinctrl-bm1880.o
 obj-$(CONFIG_PINCTRL_CY8C95X0)	+= pinctrl-cy8c95x0.o