drivers: gpio: add pcal9722 SPI GPIO expander driver

Adds a driver for NXP's PCAL9722 SPI GPIO expander

Signed-off-by: Michael Estes <michael.estes@byteserv.io>

Author: singular0770

drivers/gpio/CMakeLists.txt

@@ -78,6 +78,7 @@ zephyr_library_sources_ifdef(CONFIG_GPIO_PCA6416    gpio_pca6416.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_PCA953X    gpio_pca953x.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_PCA95XX    gpio_pca95xx.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_PCAL64XXA  gpio_pcal64xxa.c)
+zephyr_library_sources_ifdef(CONFIG_GPIO_PCAL9722   gpio_pcal9722.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_PCA_SERIES gpio_pca_series.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_PCF857X    gpio_pcf857x.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_PSOC6      gpio_psoc6.c)

drivers/gpio/Kconfig

@@ -165,6 +165,7 @@ source "drivers/gpio/Kconfig.pca953x"
 source "drivers/gpio/Kconfig.pca95xx"
 source "drivers/gpio/Kconfig.pca_series"
 source "drivers/gpio/Kconfig.pcal64xxa"
+source "drivers/gpio/Kconfig.pcal9722"
 source "drivers/gpio/Kconfig.pcf857x"
 source "drivers/gpio/Kconfig.psoc6"
 source "drivers/gpio/Kconfig.rcar"

drivers/gpio/Kconfig.pcal9722

@@ -0,0 +1,22 @@
+# PCAL9722 GPIO configuration options
+
+# Copyright 2025 Michael Estes
+# SPDX-License-Identifier: Apache-2.0
+
+menuconfig GPIO_PCAL9722
+	bool "PCAL9722 SPI GPIO chip"
+	default y
+	depends on DT_HAS_NXP_PCAL9722_ENABLED
+	depends on SPI
+	help
+	  Enable driver for PCAL9722 SPI GPIO chip.
+
+if GPIO_PCAL9722
+
+config GPIO_PCAL9722_INIT_PRIORITY
+	int "Init priority"
+	default 70
+	help
+	  PCAL9722 Device driver initialization priority.
+
+endif # GPIO_PCAL9722