intel/apollolake: Update gnvs for dptf

This patch updates dptf variable in gnvs based on device
configuration by reading the device tree structure.

BUG=chrome-os-partner:53096
TEST=Verify that the thermal zones are enumerated
       under /sys/class/thermal in Amenia and Reef board.
       Navigate to /sys/class/thermal, and verify that a
       thermal zone of type TCPU exists there.

Change-Id: I8ab34cdc94d8cdc840b02347569a9f07688e92cd
Signed-off-by: Shaunak Saha <shaunak.saha@intel.com>
Reviewed-on: https://review.coreboot.org/15620
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/apollolake/acpi.c

@@ -27,6 +27,8 @@
 #include <soc/iomap.h>
 #include <soc/pm.h>
 #include <soc/nvs.h>
+#include <soc/pci_devs.h>
+#include "chip.h"
 
 #define CSTATE_RES(address_space, width, offset, address)		\
 	{								\
@@ -146,6 +148,15 @@ unsigned long southbridge_write_acpi_tables(device_t device,
 
 static void acpi_create_gnvs(struct global_nvs_t *gnvs)
 {
+	struct soc_intel_apollolake_config *cfg;
+	struct device *dev = NB_DEV_ROOT;
+
+	if (!dev || !dev->chip_info) {
+		printk(BIOS_ERR, "BUG! Could not find SOC devicetree config\n");
+		return;
+	}
+	cfg = dev->chip_info;
+
 	if (IS_ENABLED(CONFIG_CONSOLE_CBMEM))
 		gnvs->cbmc = (uintptr_t)cbmem_find(CBMEM_ID_CONSOLE);
 
@@ -154,6 +165,9 @@ static void acpi_create_gnvs(struct global_nvs_t *gnvs)
 		chromeos_init_vboot(&gnvs->chromeos);
 		gnvs->chromeos.vbt2 = ACTIVE_ECFW_RO;
 	}
+
+	/* Enable DPTF based on mainboard configuration */
+	gnvs->dpte = cfg->dptf_enable;
 }
 
 void southbridge_inject_dsdt(device_t device)

src/soc/intel/apollolake/chip.h

@@ -102,6 +102,9 @@ struct soc_intel_apollolake_config {
 
 	/* Configure LPSS S0ix Enable */
 	uint8_t lpss_s0ix_enable;
+
+	/* Enable DPTF support */
+	int dptf_enable;
 };
 
 #endif	/* _SOC_APOLLOLAKE_CHIP_H_ */