mainboard/intel/cannonlake_rvp: Enable S0ix

This patch enables S0ix from the devicetree.

Change-Id: I38662dc7203366bdee5f1c7aaa18979867a79ba1
Signed-off-by: Vaibhav Shankar <vaibhav.shankar@intel.com>
Reviewed-on: https://review.coreboot.org/25293
Reviewed-by: Sumeet R Pawnikar <sumeet.r.pawnikar@intel.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/intel/cannonlake_rvp/variants/cnl_u/devicetree.cb b/src/mainboard/intel/cannonlake_rvp/variants/cnl_u/devicetree.cb
index 3e60ed9..18aa65d 100644
--- a/src/mainboard/intel/cannonlake_rvp/variants/cnl_u/devicetree.cb
+++ b/src/mainboard/intel/cannonlake_rvp/variants/cnl_u/devicetree.cb
@@ -70,6 +70,9 @@
 	# GPIO for SD card detect
 	register "sdcard_cd_gpio" = "GPP_G5"
 
+	# Enable S0ix
+	register "s0ix_enable" = "1"
+
 	# Audio
 	register "i2c[3]" = "{
 		.speed = I2C_SPEED_STANDARD,
diff --git a/src/mainboard/intel/cannonlake_rvp/variants/cnl_y/devicetree.cb b/src/mainboard/intel/cannonlake_rvp/variants/cnl_y/devicetree.cb
index 8502048..6dd1893 100644
--- a/src/mainboard/intel/cannonlake_rvp/variants/cnl_y/devicetree.cb
+++ b/src/mainboard/intel/cannonlake_rvp/variants/cnl_y/devicetree.cb
@@ -68,6 +68,9 @@
 	# GPIO for SD card detect
 	register "sdcard_cd_gpio" = "GPP_G5"
 
+	# Enable S0ix
+	register "s0ix_enable" = "1"
+
 	device domain 0 on
 		device pci 00.0 on  end # Host Bridge
 		device pci 02.0 on  end # Integrated Graphics Device