[nrf fromlist] drivers: gpio: Add support for PCAL6408A I/O expander

Upstream PR: zephyrproject-rtos/zephyr#31624

Add GPIO driver and devicetree binding for the PCAL6408A 8-bit I2C-bus
I/O expander.

Signed-off-by: Andrzej Głąbek <[email protected]>

Author: anangl

drivers/gpio/CMakeLists.txt

@@ -34,6 +34,7 @@ zephyr_library_sources_ifdef(CONFIG_GPIO_LPC11U6X   gpio_lpc11u6x.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_XLNX_AXI   gpio_xlnx_axi.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_NPCX       gpio_npcx.c)
 zephyr_library_sources_ifdef(CONFIG_GPIO_EMUL       gpio_emul.c)
+zephyr_library_sources_ifdef(CONFIG_GPIO_PCAL6408A  gpio_pcal6408a.c)
 
 zephyr_library_sources_ifdef(CONFIG_GPIO_SHELL      gpio_shell.c)
 

drivers/gpio/Kconfig

@@ -83,4 +83,6 @@ source "drivers/gpio/Kconfig.npcx"
 
 source "drivers/gpio/Kconfig.emul"
 
+source "drivers/gpio/Kconfig.pcal6408a"
+
 endif # GPIO

drivers/gpio/Kconfig.pcal6408a

@@ -0,0 +1,21 @@
+# PCAL6408a GPIO configuration options
+
+# Copyright (c) 2021 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+# Workaround for not being able to have commas in macro arguments
+DT_COMPAT_NXP_PCAL6408A := nxp,pcal6408a
+
+menuconfig GPIO_PCAL6408A
+	bool "PCAL6408A I2C GPIO chip"
+	default $(dt_compat_enabled,$(DT_COMPAT_NXP_PCAL6408A))
+	depends on I2C
+	help
+	  Enable driver for PCAL6408A I2C GPIO chip.
+
+config GPIO_PCAL6408A_INIT_PRIORITY
+	int "Init priority"
+	default 70
+	depends on GPIO_PCAL6408A
+	help
+	  Device driver initialization priority.