thermal/drivers: Add support for Airoha EN7581 thermal sensor

Add support for Airoha EN7581 thermal sensor. This provide support for
reading the CPU or SoC Package sensor and to setup trip points for hot
and critical condition. An interrupt is fired to react on this and
doesn't require passive poll to read the temperature.

The thermal regs provide a way to read the ADC value from an external
register placed in the Chip SCU regs. Monitor will read this value and
fire an interrupt if the trip condition configured is reached.

The Thermal Trip and Interrupt logic is conceptually similar to Mediatek
LVTS Thermal but differ in register mapping and actual function/bug
workaround. The implementation only share some register names but from
functionality observation it's very different and used only for the
basic function of periodically poll the temp and trip the interrupt.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Link: https://lore.kernel.org/r/20250511185003.3754495-2-ansuelsmth@gmail.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Author: Ansuel

drivers/thermal/Kconfig

@@ -327,6 +327,15 @@ config QORIQ_THERMAL
 	  cpufreq is used as the cooling device to throttle CPUs when the
 	  passive trip is crossed.
 
+config AIROHA_THERMAL
+	tristate "Airoha thermal sensor driver"
+	depends on ARCH_AIROHA || COMPILE_TEST
+	depends on MFD_SYSCON
+	depends on OF
+	help
+	  Enable this to plug the Airoha thermal sensor driver into the Linux
+	  thermal framework.
+
 config SPEAR_THERMAL
 	tristate "SPEAr thermal sensor driver"
 	depends on PLAT_SPEAR || COMPILE_TEST

drivers/thermal/Makefile

@@ -38,6 +38,7 @@ obj-$(CONFIG_K3_THERMAL)	+= k3_bandgap.o k3_j72xx_bandgap.o
 # platform thermal drivers
 obj-y				+= broadcom/
 obj-$(CONFIG_THERMAL_MMIO)		+= thermal_mmio.o
+obj-$(CONFIG_AIROHA_THERMAL)	+= airoha_thermal.o
 obj-$(CONFIG_SPEAR_THERMAL)	+= spear_thermal.o
 obj-$(CONFIG_SUN8I_THERMAL)     += sun8i_thermal.o
 obj-$(CONFIG_ROCKCHIP_THERMAL)	+= rockchip_thermal.o