mb/*,soc/intel: drop the obsolete dt option `speed_shift_enable`

The dt option `speed_shift_enable` is obsolete now. Drop it.

Change-Id: I5ac3b8efe37aedd442962234478fcdce675bf105
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46462
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by:  Felix Singer <felixsinger@posteo.net>
Reviewed-by: Frans Hendriks <fhendriks@eltan.com>

44 files changed, 0 insertions, 101 deletions

diff --git a/src/mainboard/51nb/x210/devicetree.cb b/src/mainboard/51nb/x210/devicetree.cb
index 294ae44022..561bd6f54b 100644
--- a/src/mainboard/51nb/x210/devicetree.cb
+++ b/src/mainboard/51nb/x210/devicetree.cb
@@ -28,9 +28,6 @@ chip soc/intel/skylake
 	register "gen2_dec" = "0x000c0681"
 	register "gen3_dec" = "0x000c1641"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# Disable DPTF
 	register "dptf_enable" = "0"
 
diff --git a/src/mainboard/asrock/h110m/devicetree.cb b/src/mainboard/asrock/h110m/devicetree.cb
index d6f29a20e9..57acd33570 100644
--- a/src/mainboard/asrock/h110m/devicetree.cb
+++ b/src/mainboard/asrock/h110m/devicetree.cb
@@ -18,9 +18,6 @@ chip soc/intel/skylake
 	register "gpe0_dw1" = "GPP_D"
 	register "gpe0_dw2" = "GPP_E"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# Enable DPTF
 	register "dptf_enable" = "1"
 
diff --git a/src/mainboard/clevo/cml-u/variants/l140cu/devicetree.cb b/src/mainboard/clevo/cml-u/variants/l140cu/devicetree.cb
index 8f256ad7fb..e8827bf6de 100644
--- a/src/mainboard/clevo/cml-u/variants/l140cu/devicetree.cb
+++ b/src/mainboard/clevo/cml-u/variants/l140cu/devicetree.cb
@@ -19,9 +19,6 @@ chip soc/intel/cannonlake
 		.tdp_pl2_override = 30,
 	}"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# Enable Enhanced Intel SpeedStep
 	register "eist_enable" = "1"
 
diff --git a/src/mainboard/facebook/monolith/devicetree.cb b/src/mainboard/facebook/monolith/devicetree.cb
index bb11d064b3..15ab7efb71 100644
--- a/src/mainboard/facebook/monolith/devicetree.cb
+++ b/src/mainboard/facebook/monolith/devicetree.cb
@@ -29,9 +29,6 @@ chip soc/intel/skylake
 	# "Intel SpeedStep Technology"
 	register "eist_enable" = "1"
 
-	# "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# DPTF
 	register "dptf_enable" = "1"
 
diff --git a/src/mainboard/google/dedede/variants/baseboard/devicetree.cb b/src/mainboard/google/dedede/variants/baseboard/devicetree.cb
index b7aa11da31..4713589608 100644
--- a/src/mainboard/google/dedede/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/dedede/variants/baseboard/devicetree.cb
@@ -136,9 +136,6 @@ chip soc/intel/jasperlake
 	register "DdiPortBDdc" = "1"
 	register "DdiPortCDdc" = "1"
 
-	# Enable Speed Shift Technology support
-	register "speed_shift_enable" = "1"
-
 	# Enable DPTF
 	register "dptf_enable" = "1"
 
diff --git a/src/mainboard/google/deltaur/variants/baseboard/devicetree.cb b/src/mainboard/google/deltaur/variants/baseboard/devicetree.cb
index 775c54815e..bbb63bcc61 100644
--- a/src/mainboard/google/deltaur/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/deltaur/variants/baseboard/devicetree.cb
@@ -134,9 +134,6 @@ chip soc/intel/tigerlake
 	register "gpio_pm[3]" = "0"
 	register "gpio_pm[4]" = "0"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	device domain 0 on
 		device pci 00.0 on  end # Host Bridge
 		device pci 02.0 on  end # Graphics
diff --git a/src/mainboard/google/drallion/variants/drallion/devicetree.cb b/src/mainboard/google/drallion/variants/drallion/devicetree.cb
index aa6af87c3a..de3b5ca8ea 100644
--- a/src/mainboard/google/drallion/variants/drallion/devicetree.cb
+++ b/src/mainboard/google/drallion/variants/drallion/devicetree.cb
@@ -40,7 +40,6 @@ chip soc/intel/cannonlake
 	# USB2 PHY Power gating
 	register "PchUsb2PhySusPgDisable" = "1"
 
-	register "speed_shift_enable" = "1"
 	register "s0ix_enable" = "1"
 	register "dptf_enable" = "1"
 	register "power_limits_config" = "{
diff --git a/src/mainboard/google/eve/devicetree.cb b/src/mainboard/google/eve/devicetree.cb
index a2550bb475..519e53ba6c 100644
--- a/src/mainboard/google/eve/devicetree.cb
+++ b/src/mainboard/google/eve/devicetree.cb
@@ -227,7 +227,6 @@ chip soc/intel/skylake
 		[PchSerialIoIndexUart2] = PchSerialIoSkipInit,
 	}"
 
-	register "speed_shift_enable" = "1"
 	register "dptf_enable" = "1"
 	register "power_limits_config" = "{
 		.tdp_pl1_override = 7,
diff --git a/src/mainboard/google/fizz/variants/baseboard/devicetree.cb b/src/mainboard/google/fizz/variants/baseboard/devicetree.cb
index 9c11e807e8..703ef5b775 100644
--- a/src/mainboard/google/fizz/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/fizz/variants/baseboard/devicetree.cb
@@ -305,7 +305,6 @@ chip soc/intel/skylake
 		[PchSerialIoIndexUart2] = PchSerialIoSkipInit,
 	}"
 
-	register "speed_shift_enable" = "1"
 	register "power_limits_config" = "{
 		.tdp_psyspl2 = 90,
 		.psys_pmax = 120,
diff --git a/src/mainboard/google/glados/devicetree.cb b/src/mainboard/google/glados/devicetree.cb
index 12312e980a..2dfb71f2c0 100644
--- a/src/mainboard/google/glados/devicetree.cb
+++ b/src/mainboard/google/glados/devicetree.cb
@@ -30,9 +30,6 @@ chip soc/intel/skylake
 	register "gen1_dec" = "0x00fc0801"
 	register "gen2_dec" = "0x000c0201"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# Enable DPTF
 	register "dptf_enable" = "1"
 
diff --git a/src/mainboard/google/hatch/variants/baseboard/devicetree.cb b/src/mainboard/google/hatch/variants/baseboard/devicetree.cb
index 10ad029e40..cdd83df114 100644
--- a/src/mainboard/google/hatch/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/hatch/variants/baseboard/devicetree.cb
@@ -29,8 +29,6 @@ chip soc/intel/cannonlake
 	register "satapwroptimize" = "1"
 	# Enable System Agent dynamic frequency
 	register "SaGv" = "SaGv_Enabled"
-	# Enable Speed Shift Technology support
-	register "speed_shift_enable" = "1"
 	# Enable S0ix
 	register "s0ix_enable" = "1"
 	# Enable DPTF
diff --git a/src/mainboard/google/poppy/variants/atlas/devicetree.cb b/src/mainboard/google/poppy/variants/atlas/devicetree.cb
index 9f9d9518d6..3797fb0135 100644
--- a/src/mainboard/google/poppy/variants/atlas/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/atlas/devicetree.cb
@@ -59,7 +59,6 @@ chip soc/intel/skylake
 	register "PmConfigSlpAMinAssert" = "3"         # 2s
 	register "PmTimerDisabled" = "1"
 
-	register "speed_shift_enable" = "1"
 	register "power_limits_config" = "{
 		.tdp_pl1_override = 7,
 		.tdp_pl2_override = 15,
diff --git a/src/mainboard/google/poppy/variants/baseboard/devicetree.cb b/src/mainboard/google/poppy/variants/baseboard/devicetree.cb
index 0dc9131aaf..0b3d6c0346 100644
--- a/src/mainboard/google/poppy/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/baseboard/devicetree.cb
@@ -246,7 +246,6 @@ chip soc/intel/skylake
 		[PchSerialIoIndexUart2] = PchSerialIoSkipInit,
 	}"
 
-	register "speed_shift_enable" = "1"
 	# PL2 override 15W for KBL-Y
 	register "power_limits_config" = "{
 		.tdp_pl2_override = 15,
diff --git a/src/mainboard/google/poppy/variants/nami/devicetree.cb b/src/mainboard/google/poppy/variants/nami/devicetree.cb
index 167bd036d6..d408f9ee93 100644
--- a/src/mainboard/google/poppy/variants/nami/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/nami/devicetree.cb
@@ -266,8 +266,6 @@ chip soc/intel/skylake
 		[PchSerialIoIndexUart2] = PchSerialIoSkipInit,
 	}"
 
-	register "speed_shift_enable" = "1"
-
 	register "tcc_offset" = "3"     # TCC of 97C
 	register "power_limits_config" = "{
 		.psys_pmax = 101,
diff --git a/src/mainboard/google/poppy/variants/nautilus/devicetree.cb b/src/mainboard/google/poppy/variants/nautilus/devicetree.cb
index ed21492946..b7d171b6ff 100644
--- a/src/mainboard/google/poppy/variants/nautilus/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/nautilus/devicetree.cb
@@ -268,7 +268,6 @@ chip soc/intel/skylake
 		[PchSerialIoIndexUart2] = PchSerialIoSkipInit,
 	}"
 
-	register "speed_shift_enable" = "1"
 	# PL2 override 15W for KBL-Y
 	register "power_limits_config" = "{
 		.tdp_pl2_override = 15,
diff --git a/src/mainboard/google/poppy/variants/nocturne/devicetree.cb b/src/mainboard/google/poppy/variants/nocturne/devicetree.cb
index 0a29601c39..ab1588af80 100644
--- a/src/mainboard/google/poppy/variants/nocturne/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/nocturne/devicetree.cb
@@ -54,8 +54,6 @@ chip soc/intel/skylake
 	register "PmConfigSlpAMinAssert" = "3"         # 2s
 	register "PmTimerDisabled" = "1"
 
-	# Set speed_shift_enable to 1 to enable P-States, and 0 to disable
-	register "speed_shift_enable" = "1"
 	register "power_limits_config" = "{
 		.tdp_pl1_override = 7,
 		.tdp_pl2_override = 18,
diff --git a/src/mainboard/google/poppy/variants/rammus/devicetree.cb b/src/mainboard/google/poppy/variants/rammus/devicetree.cb
index 591e0fb478..2334a179df 100644
--- a/src/mainboard/google/poppy/variants/rammus/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/rammus/devicetree.cb
@@ -225,7 +225,6 @@ chip soc/intel/skylake
 		[PchSerialIoIndexUart2] = PchSerialIoSkipInit,
 	}"
 
-	register "speed_shift_enable" = "1"
 	# PL2 override 18W for AML-Y
 	register "power_limits_config" = "{
 		.tdp_pl2_override = 18,
diff --git a/src/mainboard/google/poppy/variants/soraka/devicetree.cb b/src/mainboard/google/poppy/variants/soraka/devicetree.cb
index b3570d73b2..c69875597d 100644
--- a/src/mainboard/google/poppy/variants/soraka/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/soraka/devicetree.cb
@@ -247,7 +247,6 @@ chip soc/intel/skylake
 		[PchSerialIoIndexUart2] = PchSerialIoSkipInit,
 	}"
 
-	register "speed_shift_enable" = "1"
 	# PL2 override 15W for KBL-Y
 	register "power_limits_config" = "{
 		.tdp_pl2_override = 15,
diff --git a/src/mainboard/google/sarien/variants/arcada/devicetree.cb b/src/mainboard/google/sarien/variants/arcada/devicetree.cb
index b1d9a36159..3ff9b30637 100644
--- a/src/mainboard/google/sarien/variants/arcada/devicetree.cb
+++ b/src/mainboard/google/sarien/variants/arcada/devicetree.cb
@@ -29,7 +29,6 @@ chip soc/intel/cannonlake
 	# USB2 PHY Power gating
 	register "PchUsb2PhySusPgDisable" = "1"
 
-	register "speed_shift_enable" = "1"
 	register "s0ix_enable" = "1"
 	register "dptf_enable" = "1"
 	register "satapwroptimize" = "1"
diff --git a/src/mainboard/google/sarien/variants/sarien/devicetree.cb b/src/mainboard/google/sarien/variants/sarien/devicetree.cb
index e1ee6c9be8..17d0127ce6 100644
--- a/src/mainboard/google/sarien/variants/sarien/devicetree.cb
+++ b/src/mainboard/google/sarien/variants/sarien/devicetree.cb
@@ -32,7 +32,6 @@ chip soc/intel/cannonlake
 	# USB2 PHY Power gating
 	register "PchUsb2PhySusPgDisable" = "1"
 
-	register "speed_shift_enable" = "1"
 	register "s0ix_enable" = "1"
 	register "dptf_enable" = "1"
 	register "satapwroptimize" = "1"
diff --git a/src/mainboard/google/volteer/variants/baseboard/devicetree.cb b/src/mainboard/google/volteer/variants/baseboard/devicetree.cb
index b76f627873..2a62505757 100644
--- a/src/mainboard/google/volteer/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/volteer/variants/baseboard/devicetree.cb
@@ -230,9 +230,6 @@ chip soc/intel/tigerlake
 	register "DdiPort3Ddc" = "0"
 	register "DdiPort4Ddc" = "0"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# Enable S0ix
 	register "s0ix_enable" = "1"
 
diff --git a/src/mainboard/intel/adlrvp/variants/adlrvp_p/devicetree.cb b/src/mainboard/intel/adlrvp/variants/adlrvp_p/devicetree.cb
index 818f32f9fa..73055010ca 100644
--- a/src/mainboard/intel/adlrvp/variants/adlrvp_p/devicetree.cb
+++ b/src/mainboard/intel/adlrvp/variants/adlrvp_p/devicetree.cb
@@ -13,8 +13,6 @@ chip soc/intel/alderlake
 	register "pmc_gpe0_dw2" = "GPP_E"
 
 	# FSP configuration
-	# Enable Speed Shift Technology/HWP support
-	register "speed_shift_enable" = "1"
 
 	register "usb2_ports[0]" = "USB2_PORT_MID(OC0)"		# Type-C Port1
 	register "usb2_ports[1]" = "USB2_PORT_MID(OC0)"		# Type-C Port2
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 e10059887e..1110bc1e32 100644
--- a/src/mainboard/intel/cannonlake_rvp/variants/cnl_u/devicetree.cb
+++ b/src/mainboard/intel/cannonlake_rvp/variants/cnl_u/devicetree.cb
@@ -60,9 +60,6 @@ chip soc/intel/cannonlake
 	register "PcieClkSrcClkReq[4]" = "4"
 	register "PcieClkSrcClkReq[5]" = "5"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# GPIO for SD card detect
 	register "sdcard_cd_gpio" = "GPP_G5"
 
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 bf7aa1e962..42023149a9 100644
--- a/src/mainboard/intel/cannonlake_rvp/variants/cnl_y/devicetree.cb
+++ b/src/mainboard/intel/cannonlake_rvp/variants/cnl_y/devicetree.cb
@@ -57,9 +57,6 @@ chip soc/intel/cannonlake
 	register "PcieClkSrcClkReq[4]" = "4"
 	register "PcieClkSrcClkReq[5]" = "5"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# GPIO for SD card detect
 	register "sdcard_cd_gpio" = "GPP_G5"
 
diff --git a/src/mainboard/intel/coffeelake_rvp/variants/baseboard/devicetree.cb b/src/mainboard/intel/coffeelake_rvp/variants/baseboard/devicetree.cb
index 0b40a5c359..12b1c47f33 100644
--- a/src/mainboard/intel/coffeelake_rvp/variants/baseboard/devicetree.cb
+++ b/src/mainboard/intel/coffeelake_rvp/variants/baseboard/devicetree.cb
@@ -43,9 +43,6 @@ chip soc/intel/cannonlake
 	register "PcieClkSrcClkReq[4]" = "4"
 	register "PcieClkSrcClkReq[5]" = "5"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# Disable S0ix
 	register "s0ix_enable" = "0"
 
diff --git a/src/mainboard/intel/icelake_rvp/variants/icl_u/devicetree.cb b/src/mainboard/intel/icelake_rvp/variants/icl_u/devicetree.cb
index 49303da030..1215628dbc 100644
--- a/src/mainboard/intel/icelake_rvp/variants/icl_u/devicetree.cb
+++ b/src/mainboard/intel/icelake_rvp/variants/icl_u/devicetree.cb
@@ -152,9 +152,6 @@ chip soc/intel/icelake
 		[PchSerialIoIndexUART2] = PchSerialIoSkipInit,
 	}"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# Enable DPTF
 	register "dptf_enable" = "1"
 
diff --git a/src/mainboard/intel/icelake_rvp/variants/icl_y/devicetree.cb b/src/mainboard/intel/icelake_rvp/variants/icl_y/devicetree.cb
index a1c32c99be..e8c6e8f5c4 100644
--- a/src/mainboard/intel/icelake_rvp/variants/icl_y/devicetree.cb
+++ b/src/mainboard/intel/icelake_rvp/variants/icl_y/devicetree.cb
@@ -152,9 +152,6 @@ chip soc/intel/icelake
 		[PchSerialIoIndexUART2] = PchSerialIoSkipInit,
 	}"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# Enable DPTF
 	register "dptf_enable" = "1"
 
diff --git a/src/mainboard/intel/jasperlake_rvp/variants/jslrvp/devicetree.cb b/src/mainboard/intel/jasperlake_rvp/variants/jslrvp/devicetree.cb
index b9aec378fb..61a5e70695 100644
--- a/src/mainboard/intel/jasperlake_rvp/variants/jslrvp/devicetree.cb
+++ b/src/mainboard/intel/jasperlake_rvp/variants/jslrvp/devicetree.cb
@@ -122,9 +122,6 @@ chip soc/intel/jasperlake
 		[PchSerialIoIndexUART2] = PchSerialIoSkipInit,
 	}"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# Enable DPTF
 	register "dptf_enable" = "1"
 
diff --git a/src/mainboard/intel/kblrvp/variants/baseboard/devicetree.cb b/src/mainboard/intel/kblrvp/variants/baseboard/devicetree.cb
index 8de089de90..e17c8b71f3 100644
--- a/src/mainboard/intel/kblrvp/variants/baseboard/devicetree.cb
+++ b/src/mainboard/intel/kblrvp/variants/baseboard/devicetree.cb
@@ -16,9 +16,6 @@ chip soc/intel/skylake
 	# EC host command ranges are in 0x800-0x8ff & 0x200-0x20f
 	register "gen1_dec" = "0x00fc0801"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# Enable DPTF
 	register "dptf_enable" = "1"
 
diff --git a/src/mainboard/intel/kunimitsu/devicetree.cb b/src/mainboard/intel/kunimitsu/devicetree.cb
index 3afff4506e..07afb7bd1b 100644
--- a/src/mainboard/intel/kunimitsu/devicetree.cb
+++ b/src/mainboard/intel/kunimitsu/devicetree.cb
@@ -17,9 +17,6 @@ chip soc/intel/skylake
 	register "gen1_dec" = "0x00fc0801"
 	register "gen2_dec" = "0x000c0201"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# Enable DPTF
 	register "dptf_enable" = "1"
 
diff --git a/src/mainboard/intel/saddlebrook/devicetree.cb b/src/mainboard/intel/saddlebrook/devicetree.cb
index a25cb8c579..5c64326e3e 100644
--- a/src/mainboard/intel/saddlebrook/devicetree.cb
+++ b/src/mainboard/intel/saddlebrook/devicetree.cb
@@ -14,9 +14,6 @@ chip soc/intel/skylake
 	register "gpe0_dw1" = "GPP_D"
 	register "gpe0_dw2" = "GPP_E"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# FSP Configuration
 	register "DspEnable" = "1"
 	register "IoBufferOwnership" = "3"
diff --git a/src/mainboard/intel/tglrvp/variants/tglrvp_up3/devicetree.cb b/src/mainboard/intel/tglrvp/variants/tglrvp_up3/devicetree.cb
index 09ab2583c1..de93c99aa2 100644
--- a/src/mainboard/intel/tglrvp/variants/tglrvp_up3/devicetree.cb
+++ b/src/mainboard/intel/tglrvp/variants/tglrvp_up3/devicetree.cb
@@ -115,9 +115,6 @@ chip soc/intel/tigerlake
 	register "TcssXhciEn" = "1"
 	register "TcssAuxOri" = "0"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# Enable S0ix
 	register "s0ix_enable" = "1"
 
diff --git a/src/mainboard/intel/tglrvp/variants/tglrvp_up4/devicetree.cb b/src/mainboard/intel/tglrvp/variants/tglrvp_up4/devicetree.cb
index 25c229332a..4078894bfd 100644
--- a/src/mainboard/intel/tglrvp/variants/tglrvp_up4/devicetree.cb
+++ b/src/mainboard/intel/tglrvp/variants/tglrvp_up4/devicetree.cb
@@ -119,9 +119,6 @@ chip soc/intel/tigerlake
 	register "TcssXhciEn" = "1"
 	register "TcssAuxOri" = "0"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# Enable S0ix
 	register "s0ix_enable" = "1"
 
diff --git a/src/mainboard/kontron/bsl6/devicetree.cb b/src/mainboard/kontron/bsl6/devicetree.cb
index 357f8fa1fa..ef1f0d4a5f 100644
--- a/src/mainboard/kontron/bsl6/devicetree.cb
+++ b/src/mainboard/kontron/bsl6/devicetree.cb
@@ -2,8 +2,6 @@
 
 chip soc/intel/skylake
 
-	register "speed_shift_enable" = "1"
-
 	register "common_soc_config" = "{
 		.chipset_lockdown = CHIPSET_LOCKDOWN_COREBOOT,
 	}"
diff --git a/src/mainboard/libretrend/lt1000/devicetree.cb b/src/mainboard/libretrend/lt1000/devicetree.cb
index d47eca8a48..911690f053 100644
--- a/src/mainboard/libretrend/lt1000/devicetree.cb
+++ b/src/mainboard/libretrend/lt1000/devicetree.cb
@@ -30,9 +30,6 @@ chip soc/intel/skylake
 	register "gen3_dec" = "0x00fc02e1" # COM2/4/5/6 ports 0x2e0 - 0x2ff
 	register "gen4_dec" = "0x000c0081" # 0x80 - 0x8f
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# Disable DPTF
 	register "dptf_enable" = "0"
 
diff --git a/src/mainboard/prodrive/hermes/variants/baseboard/overridetree.cb b/src/mainboard/prodrive/hermes/variants/baseboard/overridetree.cb
index 071fc5fc95..04e6774f65 100644
--- a/src/mainboard/prodrive/hermes/variants/baseboard/overridetree.cb
+++ b/src/mainboard/prodrive/hermes/variants/baseboard/overridetree.cb
@@ -126,8 +126,6 @@ chip soc/intel/cannonlake
 	# Thermal
 	register "tcc_offset" = "6"     # TCC of 94C
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
 
 	# Disable S0ix
 	register "s0ix_enable" = "0"
diff --git a/src/mainboard/protectli/vault_kbl/devicetree.cb b/src/mainboard/protectli/vault_kbl/devicetree.cb
index 2a4b1e9ffd..e6e748a247 100644
--- a/src/mainboard/protectli/vault_kbl/devicetree.cb
+++ b/src/mainboard/protectli/vault_kbl/devicetree.cb
@@ -17,8 +17,6 @@ chip soc/intel/skylake
 	register "gen3_dec" = "0x000c03e1"
 	register "gen4_dec" = "0x001c02e1"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
 	register "eist_enable" = "1"
 
 	# Disable DPTF
diff --git a/src/mainboard/purism/librem_skl/devicetree.cb b/src/mainboard/purism/librem_skl/devicetree.cb
index 23c57120f1..2c73280148 100644
--- a/src/mainboard/purism/librem_skl/devicetree.cb
+++ b/src/mainboard/purism/librem_skl/devicetree.cb
@@ -37,9 +37,6 @@ chip soc/intel/skylake
 	register "gen1_dec" = "0x00000381"
 	register "gen2_dec" = "0x000c0081"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# Disable DPTF
 	register "dptf_enable" = "0"
 
diff --git a/src/mainboard/purism/librem_whl/devicetree.cb b/src/mainboard/purism/librem_whl/devicetree.cb
index 497a4cca4d..205033230b 100644
--- a/src/mainboard/purism/librem_whl/devicetree.cb
+++ b/src/mainboard/purism/librem_whl/devicetree.cb
@@ -24,9 +24,6 @@ chip soc/intel/cannonlake
 		.tdp_pl2_override = 28,
 	}"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# Enable Enhanced Intel SpeedStep
 	register "eist_enable" = "1"
 
diff --git a/src/mainboard/razer/blade_stealth_kbl/devicetree.cb b/src/mainboard/razer/blade_stealth_kbl/devicetree.cb
index edf13335a2..4f8ceb6815 100644
--- a/src/mainboard/razer/blade_stealth_kbl/devicetree.cb
+++ b/src/mainboard/razer/blade_stealth_kbl/devicetree.cb
@@ -19,9 +19,6 @@ chip soc/intel/skylake
 	register "gen2_dec" = "0x000c0681"
 	register "gen3_dec" = "0x000c1641"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# Disable DPTF
 	register "dptf_enable" = "0"
 
diff --git a/src/mainboard/siemens/chili/variants/base/devicetree.cb b/src/mainboard/siemens/chili/variants/base/devicetree.cb
index 505e9a4852..cca88384ff 100644
--- a/src/mainboard/siemens/chili/variants/base/devicetree.cb
+++ b/src/mainboard/siemens/chili/variants/base/devicetree.cb
@@ -4,7 +4,6 @@ chip soc/intel/cannonlake
 	# FSP configuration
 	register "SaGv" = "SaGv_Enabled"
 	register "RMT" = "0"
-	register "speed_shift_enable" = "1"
 
 	register "PchHdaDspEnable" = "0"
         register "PchHdaAudioLinkHda" = "1"
diff --git a/src/mainboard/siemens/chili/variants/chili/devicetree.cb b/src/mainboard/siemens/chili/variants/chili/devicetree.cb
index 5a2fc01e37..3c9d968506 100644
--- a/src/mainboard/siemens/chili/variants/chili/devicetree.cb
+++ b/src/mainboard/siemens/chili/variants/chili/devicetree.cb
@@ -4,7 +4,6 @@ chip soc/intel/cannonlake
 	# FSP configuration
 	register "SaGv" = "SaGv_Enabled"
 	register "RMT" = "0"
-	register "speed_shift_enable" = "1"
 
 	register "PchHdaDspEnable" = "0"
         register "PchHdaAudioLinkHda" = "1"
diff --git a/src/mainboard/supermicro/x11-lga1151-series/devicetree.cb b/src/mainboard/supermicro/x11-lga1151-series/devicetree.cb
index dd0e520365..e7b26dc5de 100644
--- a/src/mainboard/supermicro/x11-lga1151-series/devicetree.cb
+++ b/src/mainboard/supermicro/x11-lga1151-series/devicetree.cb
@@ -3,9 +3,6 @@ chip soc/intel/skylake
 	register "deep_s5_enable_ac" = "0"
 	register "deep_s5_enable_dc" = "0"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# FSP Configuration
 	register "ScsEmmcHs400Enabled" = "0"
 	register "SkipExtGfxScan" = "1"
diff --git a/src/mainboard/system76/lemp9/devicetree.cb b/src/mainboard/system76/lemp9/devicetree.cb
index 277570ece9..84c0312c3f 100644
--- a/src/mainboard/system76/lemp9/devicetree.cb
+++ b/src/mainboard/system76/lemp9/devicetree.cb
@@ -19,9 +19,6 @@ chip soc/intel/cannonlake
 		.tdp_pl2_override = 30,
 	}"
 
-	# Enable "Intel Speed Shift Technology"
-	register "speed_shift_enable" = "1"
-
 	# Enable Enhanced Intel SpeedStep
 	register "eist_enable" = "1"