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 <rrangel@chromium.org>
Change-Id: Iaeed75bdaa16b117d0fa7144ede98db1388f74f3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54134
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>

2 files changed, 58 insertions, 1 deletions

diff --git a/src/mainboard/google/guybrush/Kconfig b/src/mainboard/google/guybrush/Kconfig
index fc515af422..5326616edb 100644
--- a/src/mainboard/google/guybrush/Kconfig
+++ b/src/mainboard/google/guybrush/Kconfig
@@ -11,6 +11,7 @@ config BOARD_SPECIFIC_OPTIONS
 	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 a5ec351168..a30772054a 100644
--- a/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb
@@ -152,7 +152,7 @@ chip soc/amd/cezanne
 
 		device ref lpc_bridge on
 			chip ec/google/chromeec
-				device pnp 0c09.0 on end
+				device pnp 0c09.0 alias chrome_ec on end
 			end
 		end
 	end # domain
@@ -168,4 +168,60 @@ chip soc/amd/cezanne
 
 	device ref uart_0 on end # UART0
 
+	# See https://source.chromium.org/chromiumos/chromiumos/codesearch/+/main:src/platform/ec/baseboard/guybrush/baseboard.c;l=221
+	# for the EC configuration.
+	#
+	# EC is configured to power off the system at 105C, so add a two degree
+	# buffer so the OS can gracefully shutdown.
+	#
+	# EC is configured to assert PROCHOT at 100C. That drastically lowers
+	# performance. Instead we will tell the OS to start throttling the CPUs
+	# at 95C in hopes that we don't hit the PROCHOT limit.
+	#
+	# We set use_acpi1_thermal_zone_scope because the Chrome ec.asl
+	# performs a `Notify` to the `_\TZ` scope.
+	chip drivers/acpi/thermal_zone
+		register "description" = ""SOC""
+		use chrome_ec as temperature_controller
+		register "sensor_id" = "0"
+		register "polling_period" = "10"
+		register "critical_temperature" = "103"
+		register "passive_config.temperature" = "95"
+		register "use_acpi1_thermal_zone_scope" = "true"
+
+		device generic 0 on end
+	end
+	chip drivers/acpi/thermal_zone
+		register "description" = ""Charger""
+		use chrome_ec as temperature_controller
+		register "sensor_id" = "1"
+		register "polling_period" = "10"
+		register "critical_temperature" = "103"
+		register "passive_config.temperature" = "95"
+		register "use_acpi1_thermal_zone_scope" = "true"
+
+		device generic 1 on end
+	end
+	chip drivers/acpi/thermal_zone
+		register "description" = ""Memory""
+		use chrome_ec as temperature_controller
+		register "sensor_id" = "2"
+		register "polling_period" = "10"
+		register "critical_temperature" = "103"
+		register "passive_config.temperature" = "95"
+		register "use_acpi1_thermal_zone_scope" = "true"
+
+		device generic 2 on end
+	end
+	chip drivers/acpi/thermal_zone
+		register "description" = ""CPU""
+		use chrome_ec as temperature_controller
+		register "sensor_id" = "3"
+		register "polling_period" = "10"
+		register "critical_temperature" = "103"
+		register "passive_config.temperature" = "95"
+		register "use_acpi1_thermal_zone_scope" = "true"
+
+		device generic 3 on end
+	end
 end	# chip soc/amd/cezanne