Change in coreboot[master]: mb/google/guybrush: Add SoC thermal zone

[Raul Rangel (Code Review)]

Raul Rangel has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/54134 )

Change subject: mb/google/guybrush: Add SoC thermal zone
......................................................................

mb/google/guybrush: Add SoC thermal zone

The time constant values were taken from the zork thermal.asl.

BUG=b:186166365
TEST=Boot guybrush to OS and verify logs look correct
      thermal-0294 thermal_trips_update  : Found critical threshold [3641]
      thermal-0321 thermal_trips_update  : No hot threshold
      thermal-0200 thermal_get_temperatur: Temperature is 3060 dK
      thermal-0219 thermal_get_polling_fr: Polling frequency is 100 dS
      thermal-0200 thermal_get_temperatur: Temperature is 3060 dK
    thermal LNXTHERM:00: registered as thermal_zone0
    ACPI: Thermal Zone [TM00] (33 C)
      thermal-0200 thermal_get_temperatur: Temperature is 3070 dK

Signed-off-by: Raul E Rangel 
Change-Id: Iaeed75bdaa16b117d0fa7144ede98db1388f74f3
---
M src/mainboard/google/guybrush/Kconfig
M src/mainboard/google/guybrush/variants/baseboard/devicetree.cb
2 files changed, 25 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/34/54134/1

diff --git a/src/mainboard/google/guybrush/Kconfig b/src/mainboard/google/guybrush/Kconfig
index 8c23cf0..9dba79c 100644
--- a/src/mainboard/google/guybrush/Kconfig
+++ b/src/mainboard/google/guybrush/Kconfig
@@ -11,6 +11,7 @@
    select BOARD_ROMSIZE_KB_16384
    select DISABLE_KEYBOARD_RESET_PIN
    select DISABLE_SPI_FLASH_ROM_SHARING
+	select DRIVERS_ACPI_THERMAL_ZONE
    select DRIVERS_AMD_I2S_MACHINE_DEV
    select DRIVERS_GENERIC_GPIO_KEYS
    select DRIVERS_I2C_GENERIC
diff --git a/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb b/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb
index 1d01fff..1a019b4 100644
--- a/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb
@@ -52,6 +52,30 @@
    register "i2c_scl_reset" = "GPIO_I2C0_SCL | GPIO_I2C1_SCL |
    				GPIO_I2C2_SCL | GPIO_I2C3_SCL"

+	chip drivers/acpi/thermal_zone
+		register "name" = ""SOC""
+
+		register "temperature_sensor_id" = "0"
+
+		register "polling_period" = "10000"
+
+		# EC is configured to power off the system at 92C, so add one degree of buffer
+		# so the OS can gracefully shutdown
+		register "critical_temperature" = "91"
+
+		# EC is configured to assert PROCHOT at 90C. That drastically lowers
+		# performance. Instead we will tell the OS to start throttling the CPUs at
+		# 85C in hopes that we don't hit the PROCHOT limit.
+		register "passive_config" = "{
+			.temperature = 85,
+			.time_constant_1 = 2,
+			.time_constant_2 = 5,
+			.time_sampling_period = 2000,
+		}"
+
+		device generic 0 on end
+	end
+
    device domain 0 on
    	device ref gpp_bridge_0 on end # WLAN
    	device ref gpp_bridge_1 on end # SD