drivers: interrupt_controller: Add support for NXP's IRQ_STEER

This commit implements the support for the IRQ_STEER IP which
is an interrupt controller employed by some NXP chips.

Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>

drivers/interrupt_controller/CMakeLists.txt

@@ -35,6 +35,7 @@ zephyr_library_sources_ifdef(CONFIG_NUCLEI_ECLIC            intc_nuclei_eclic.c)
 zephyr_library_sources_ifdef(CONFIG_NXP_S32_EIRQ            intc_eirq_nxp_s32.c)
 zephyr_library_sources_ifdef(CONFIG_XMC4XXX_INTC            intc_xmc4xxx.c)
 zephyr_library_sources_ifdef(CONFIG_NXP_PINT                intc_nxp_pint.c)
+zephyr_library_sources_ifdef(CONFIG_NXP_IRQSTEER            intc_nxp_irqsteer.c)
 
 if(CONFIG_INTEL_VTD_ICTL)
   zephyr_library_include_directories(${ZEPHYR_BASE}/arch/x86/include)

drivers/interrupt_controller/Kconfig

@@ -102,4 +102,6 @@ source "drivers/interrupt_controller/Kconfig.nxp_pint"
 
 source "drivers/interrupt_controller/Kconfig.vim"
 
+source "drivers/interrupt_controller/Kconfig.nxp_irqsteer"
+
 endmenu

drivers/interrupt_controller/Kconfig.nxp_irqsteer

@@ -0,0 +1,24 @@
+# Copyright 2023 NXP
+# SPDX-License-Identifier: Apache-2.0
+
+config NXP_IRQSTEER
+	bool "IRQ_STEER interrupt controller for NXP chips"
+	default y
+	depends on DT_HAS_NXP_IRQSTEER_INTC_ENABLED
+	help
+		The IRQSTEER INTC provides support for MUX-ing
+		multiple interrupts from peripheral to one or
+		more CPU interrupt lines. This is used for CPUs
+		such as XTENSA DSPs.
+
+config NXP_IRQSTEER_ISR_THRESHOLD
+	int "Error threshold for a dispatcher's ISR"
+	default 5
+	depends on NXP_IRQSTEER
+	help
+		This config controls how many times a
+		dispatcher's ISR is allowed to iterate
+		over its assigned interrupt status register
+		before it can conclude that an interrupt
+		will get retriggered ad-infinitum (or at
+		least for an unacceptable number of times).