drivers: gpio: PCF857x: Modify PCF8574 driver

Modify existing PCF8574 driver as PCF857x to be used with both PCF8574 and PCF8575.
PCF8574 - 8 channel I/O expander
PCF8575 - 16 channel I/O expander

Signed-off-by: Amrith Venkat Kesavamoorthi <amrith@mr-beam.org>

drivers/gpio/CMakeLists.txt

@@ -55,7 +55,7 @@ zephyr_library_sources_ifdef(CONFIG_GPIO_SNPS_CREG  gpio_creg_gpio.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_STMPE1600  gpio_stmpe1600.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_XEC_V2     gpio_mchp_xec_v2.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_PCA953X    gpio_pca953x.c)
-zephyr_library_sources_ifdef(CONFIG_GPIO_PCF8574    gpio_pcf8574.c)
+zephyr_library_sources_ifdef(CONFIG_GPIO_PCF857X    gpio_pcf857x.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_FXL6408    gpio_fxl6408.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_ANDES_ATCGPIO100 gpio_andes_atcgpio100.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_NEORV32    gpio_neorv32.c)

drivers/gpio/Kconfig

@@ -159,7 +159,7 @@ source "drivers/gpio/Kconfig.stmpe1600"
 
 source "drivers/gpio/Kconfig.pca953x"
 
-source "drivers/gpio/Kconfig.pcf8574"
+source "drivers/gpio/Kconfig.pcf857x"
 
 source "drivers/gpio/Kconfig.fxl6408"
 

drivers/gpio/Kconfig.pcf857x

@@ -0,0 +1,20 @@
+# PCF857x GPIO configuration options
+
+# Copyright (c) 2022 Ithinx
+# Copyright (c) 2023 Mr Beam Lasers GmbH
+# Copyright (c) 2023 Amrith Venkat Kesavamoorthi <amrith@mr-beam.org>
+
+menuconfig GPIO_PCF857X
+	bool "PCF857X I2C GPIO chip"
+	default y
+	depends on DT_HAS_NXP_PCF857X_ENABLED
+	select I2C
+	help
+	  Enable driver for PCF857X I2C GPIO chip.
+
+config GPIO_PCF857X_INIT_PRIORITY
+	int "Init priority"
+	default 70
+	depends on GPIO_PCF857X
+	help
+	  Device driver initialization priority.