[mirror_ubuntu-artful-kernel.git] / drivers / cpufreq / Kconfig.arm

#
# ARM CPU Frequency scaling drivers
#

# big LITTLE core layer and glue drivers
config ARM_BIG_LITTLE_CPUFREQ
	tristate "Generic ARM big LITTLE CPUfreq driver"
	depends on (ARM_CPU_TOPOLOGY || ARM64) && HAVE_CLK
	# if CPU_THERMAL is on and THERMAL=m, ARM_BIT_LITTLE_CPUFREQ cannot be =y
	depends on !CPU_THERMAL || THERMAL
	select PM_OPP
	help
	  This enables the Generic CPUfreq driver for ARM big.LITTLE platforms.

config ARM_BRCMSTB_AVS_CPUFREQ
	tristate "Broadcom STB AVS CPUfreq driver"
	depends on ARCH_BRCMSTB || COMPILE_TEST
	default y
	help
	  Some Broadcom STB SoCs use a co-processor running proprietary firmware
	  ("AVS") to handle voltage and frequency scaling. This driver provides
	  a standard CPUfreq interface to to the firmware.

	  Say Y, if you have a Broadcom SoC with AVS support for DFS or DVFS.

config ARM_BRCMSTB_AVS_CPUFREQ_DEBUG
	bool "Broadcom STB AVS CPUfreq driver sysfs debug capability"
	depends on ARM_BRCMSTB_AVS_CPUFREQ
	help
	  Enabling this option turns on debug support via sysfs under
	  /sys/kernel/debug/brcmstb-avs-cpufreq. It is possible to read all and
	  write some AVS mailbox registers through sysfs entries.

	  If in doubt, say N.

config ARM_DT_BL_CPUFREQ
	tristate "Generic probing via DT for ARM big LITTLE CPUfreq driver"
	depends on ARM_BIG_LITTLE_CPUFREQ && OF
	help
	  This enables probing via DT for Generic CPUfreq driver for ARM
	  big.LITTLE platform. This gets frequency tables from DT.

config ARM_VEXPRESS_SPC_CPUFREQ
        tristate "Versatile Express SPC based CPUfreq driver"
	depends on ARM_BIG_LITTLE_CPUFREQ && ARCH_VEXPRESS_SPC
        help
          This add the CPUfreq driver support for Versatile Express
	  big.LITTLE platforms using SPC for power management.

config ARM_EXYNOS5440_CPUFREQ
	tristate "SAMSUNG EXYNOS5440"
	depends on SOC_EXYNOS5440
	depends on HAVE_CLK && OF
	select PM_OPP
	default y
	help
	  This adds the CPUFreq driver for Samsung EXYNOS5440
	  SoC. The nature of exynos5440 clock controller is
	  different than previous exynos controllers so not using
	  the common exynos framework.

	  If in doubt, say N.

config ARM_HIGHBANK_CPUFREQ
	tristate "Calxeda Highbank-based"
	depends on ARCH_HIGHBANK && CPUFREQ_DT && REGULATOR
	default m
	help
	  This adds the CPUFreq driver for Calxeda Highbank SoC
	  based boards.

	  If in doubt, say N.

config ARM_DB8500_CPUFREQ
	tristate "ST-Ericsson DB8500 cpufreq" if COMPILE_TEST && !ARCH_U8500
	default ARCH_U8500
	depends on HAS_IOMEM
	depends on !CPU_THERMAL || THERMAL
	help
	  This adds the CPUFreq driver for ST-Ericsson Ux500 (DB8500) SoC
	  series.

config ARM_IMX6Q_CPUFREQ
	tristate "Freescale i.MX6 cpufreq support"
	depends on ARCH_MXC
	depends on REGULATOR_ANATOP
	select PM_OPP
	help
	  This adds cpufreq driver support for Freescale i.MX6 series SoCs.

	  If in doubt, say N.

config ARM_KIRKWOOD_CPUFREQ
	def_bool MACH_KIRKWOOD
	help
	  This adds the CPUFreq driver for Marvell Kirkwood
	  SoCs.

config ARM_MT8173_CPUFREQ
	tristate "Mediatek MT8173 CPUFreq support"
	depends on ARCH_MEDIATEK && REGULATOR
	depends on ARM64 || (ARM_CPU_TOPOLOGY && COMPILE_TEST)
	depends on !CPU_THERMAL || THERMAL
	select PM_OPP
	help
	  This adds the CPUFreq driver support for Mediatek MT8173 SoC.

config ARM_OMAP2PLUS_CPUFREQ
	bool "TI OMAP2+"
	depends on ARCH_OMAP2PLUS
	default ARCH_OMAP2PLUS

config ARM_S3C_CPUFREQ
	bool
	help
	  Internal configuration node for common cpufreq on Samsung SoC

config ARM_S3C24XX_CPUFREQ
	bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
	depends on ARCH_S3C24XX
	select ARM_S3C_CPUFREQ
	help
	  This enables the CPUfreq driver for the Samsung S3C24XX family
	  of CPUs.

	  For details, take a look at <file:Documentation/cpu-freq>.

	  If in doubt, say N.

config ARM_S3C24XX_CPUFREQ_DEBUG
	bool "Debug CPUfreq Samsung driver core"
	depends on ARM_S3C24XX_CPUFREQ
	help
	  Enable s3c_freq_dbg for the Samsung S3C CPUfreq core

config ARM_S3C24XX_CPUFREQ_IODEBUG
	bool "Debug CPUfreq Samsung driver IO timing"
	depends on ARM_S3C24XX_CPUFREQ
	help
	  Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core

config ARM_S3C24XX_CPUFREQ_DEBUGFS
	bool "Export debugfs for CPUFreq"
	depends on ARM_S3C24XX_CPUFREQ && DEBUG_FS
	help
	  Export status information via debugfs.

config ARM_S3C2410_CPUFREQ
	bool
	depends on ARM_S3C24XX_CPUFREQ && CPU_S3C2410
	select S3C2410_CPUFREQ_UTILS
	help
	  CPU Frequency scaling support for S3C2410

config ARM_S3C2412_CPUFREQ
	bool
	depends on ARM_S3C24XX_CPUFREQ && CPU_S3C2412
	default y
	select S3C2412_IOTIMING
	help
	  CPU Frequency scaling support for S3C2412 and S3C2413 SoC CPUs.

config ARM_S3C2416_CPUFREQ
	bool "S3C2416 CPU Frequency scaling support"
	depends on CPU_S3C2416
	help
	  This adds the CPUFreq driver for the Samsung S3C2416 and
	  S3C2450 SoC. The S3C2416 supports changing the rate of the
	  armdiv clock source and also entering a so called dynamic
	  voltage scaling mode in which it is possible to reduce the
	  core voltage of the CPU.

	  If in doubt, say N.

config ARM_S3C2416_CPUFREQ_VCORESCALE
	bool "Allow voltage scaling for S3C2416 arm core"
	depends on ARM_S3C2416_CPUFREQ && REGULATOR
	help
	  Enable CPU voltage scaling when entering the dvs mode.
	  It uses information gathered through existing hardware and
	  tests but not documented in any datasheet.

	  If in doubt, say N.

config ARM_S3C2440_CPUFREQ
	bool "S3C2440/S3C2442 CPU Frequency scaling support"
	depends on ARM_S3C24XX_CPUFREQ && (CPU_S3C2440 || CPU_S3C2442)
	select S3C2410_CPUFREQ_UTILS
	default y
	help
	  CPU Frequency scaling support for S3C2440 and S3C2442 SoC CPUs.

config ARM_S3C64XX_CPUFREQ
	bool "Samsung S3C64XX"
	depends on CPU_S3C6410
	default y
	help
	  This adds the CPUFreq driver for Samsung S3C6410 SoC.

	  If in doubt, say N.

config ARM_S5PV210_CPUFREQ
	bool "Samsung S5PV210 and S5PC110"
	depends on CPU_S5PV210
	default y
	help
	  This adds the CPUFreq driver for Samsung S5PV210 and
	  S5PC110 SoCs.

	  If in doubt, say N.

config ARM_SA1100_CPUFREQ
	bool

config ARM_SA1110_CPUFREQ
	bool

config ARM_SCPI_CPUFREQ
        tristate "SCPI based CPUfreq driver"
	depends on ARM_BIG_LITTLE_CPUFREQ && ARM_SCPI_PROTOCOL && COMMON_CLK_SCPI
        help
	  This adds the CPUfreq driver support for ARM big.LITTLE platforms
	  using SCPI protocol for CPU power management.

	  This driver uses SCPI Message Protocol driver to interact with the
	  firmware providing the CPU DVFS functionality.

config ARM_SPEAR_CPUFREQ
	bool "SPEAr CPUFreq support"
	depends on PLAT_SPEAR
	default y
	help
	  This adds the CPUFreq driver support for SPEAr SOCs.

config ARM_STI_CPUFREQ
	tristate "STi CPUFreq support"
	depends on SOC_STIH407
	help
	  This driver uses the generic OPP framework to match the running
	  platform with a predefined set of suitable values.  If not provided
	  we will fall-back so safe-values contained in Device Tree.  Enable
	  this config option if you wish to add CPUFreq support for STi based
	  SoCs.

config ARM_TEGRA20_CPUFREQ
	bool "Tegra20 CPUFreq support"
	depends on ARCH_TEGRA
	default y
	help
	  This adds the CPUFreq driver support for Tegra20 SOCs.

config ARM_TEGRA124_CPUFREQ
	tristate "Tegra124 CPUFreq support"
	depends on ARCH_TEGRA && CPUFREQ_DT && REGULATOR
	default y
	help
	  This adds the CPUFreq driver support for Tegra124 SOCs.

config ARM_TEGRA186_CPUFREQ
	tristate "Tegra186 CPUFreq support"
	depends on ARCH_TEGRA && TEGRA_BPMP
	help
	  This adds the CPUFreq driver support for Tegra186 SOCs.

config ARM_TI_CPUFREQ
	bool "Texas Instruments CPUFreq support"
	depends on ARCH_OMAP2PLUS
	help
	  This driver enables valid OPPs on the running platform based on
	  values contained within the SoC in use. Enable this in order to
	  use the cpufreq-dt driver on all Texas Instruments platforms that
	  provide dt based operating-points-v2 tables with opp-supported-hw
	  data provided. Required for cpufreq support on AM335x, AM437x,
	  DRA7x, and AM57x platforms.

config ARM_PXA2xx_CPUFREQ
	tristate "Intel PXA2xx CPUfreq driver"
	depends on PXA27x || PXA25x
	help
	  This add the CPUFreq driver support for Intel PXA2xx SOCs.

	  If in doubt, say N.

config ACPI_CPPC_CPUFREQ
	tristate "CPUFreq driver based on the ACPI CPPC spec"
	depends on ACPI_PROCESSOR
	select ACPI_CPPC_LIB
	default n
	help
	  This adds a CPUFreq driver which uses CPPC methods
	  as described in the ACPIv5.1 spec. CPPC stands for
	  Collaborative Processor Performance Controls. It
	  is based on an abstract continuous scale of CPU
	  performance values which allows the remote power
	  processor to flexibly optimize for power and
	  performance. CPPC relies on power management firmware
	  support for its operation.

	  If in doubt, say N.
Commit	Line	Data
f7d77079 KK	1	#
	2	# ARM CPU Frequency scaling drivers
	3	#
	4
3b84d58d	5	# big LITTLE core layer and glue drivers
8a67f0ef	6	config ARM_BIG_LITTLE_CPUFREQ
99af7711	7	tristate "Generic ARM big LITTLE CPUfreq driver"
14730145	8	depends on (ARM_CPU_TOPOLOGY \|\| ARM64) && HAVE_CLK
2f7e8a17 PA	9	# if CPU_THERMAL is on and THERMAL=m, ARM_BIT_LITTLE_CPUFREQ cannot be =y
2f7e8a17 PA	10	depends on !CPU_THERMAL \|\| THERMAL
109df086	11	select PM_OPP
99af7711 VK	12	help
99af7711 VK	13	This enables the Generic CPUfreq driver for ARM big.LITTLE platforms.
8a67f0ef	14
de322e08 MM	15	config ARM_BRCMSTB_AVS_CPUFREQ
	16	tristate "Broadcom STB AVS CPUfreq driver"
	17	depends on ARCH_BRCMSTB \|\| COMPILE_TEST
	18	default y
	19	help
	20	Some Broadcom STB SoCs use a co-processor running proprietary firmware
	21	("AVS") to handle voltage and frequency scaling. This driver provides
	22	a standard CPUfreq interface to to the firmware.
	23
	24	Say Y, if you have a Broadcom SoC with AVS support for DFS or DVFS.
	25
33de45c1 MM	26	config ARM_BRCMSTB_AVS_CPUFREQ_DEBUG
	27	bool "Broadcom STB AVS CPUfreq driver sysfs debug capability"
	28	depends on ARM_BRCMSTB_AVS_CPUFREQ
	29	help
	30	Enabling this option turns on debug support via sysfs under
	31	/sys/kernel/debug/brcmstb-avs-cpufreq. It is possible to read all and
	32	write some AVS mailbox registers through sysfs entries.
	33
	34	If in doubt, say N.
	35
8a67f0ef	36	config ARM_DT_BL_CPUFREQ
99af7711 VK	37	tristate "Generic probing via DT for ARM big LITTLE CPUfreq driver"
99af7711 VK	38	depends on ARM_BIG_LITTLE_CPUFREQ && OF
8a67f0ef	39	help
99af7711 VK	40	This enables probing via DT for Generic CPUfreq driver for ARM
99af7711 VK	41	big.LITTLE platform. This gets frequency tables from DT.
8a67f0ef	42
3b84d58d	43	config ARM_VEXPRESS_SPC_CPUFREQ
	44	tristate "Versatile Express SPC based CPUfreq driver"
	45	depends on ARM_BIG_LITTLE_CPUFREQ && ARCH_VEXPRESS_SPC
	46	help
	47	This add the CPUfreq driver support for Versatile Express
	48	big.LITTLE platforms using SPC for power management.
	49
8b2b4a4e AB	50	config ARM_EXYNOS5440_CPUFREQ
	51	tristate "SAMSUNG EXYNOS5440"
	52	depends on SOC_EXYNOS5440
	53	depends on HAVE_CLK && OF
	54	select PM_OPP
	55	default y
	56	help
	57	This adds the CPUFreq driver for Samsung EXYNOS5440
	58	SoC. The nature of exynos5440 clock controller is
	59	different than previous exynos controllers so not using
	60	the common exynos framework.
	61
	62	If in doubt, say N.
	63
a0ea048a VK	64	config ARM_HIGHBANK_CPUFREQ
a0ea048a VK	65	tristate "Calxeda Highbank-based"
bbcf0719	66	depends on ARCH_HIGHBANK && CPUFREQ_DT && REGULATOR
a0ea048a VK	67	default m
	68	help
	69	This adds the CPUFreq driver for Calxeda Highbank SoC
	70	based boards.
	71
	72	If in doubt, say N.
	73
be0408d7 AB	74	config ARM_DB8500_CPUFREQ
	75	tristate "ST-Ericsson DB8500 cpufreq" if COMPILE_TEST && !ARCH_U8500
	76	default ARCH_U8500
	77	depends on HAS_IOMEM
	78	depends on !CPU_THERMAL \|\| THERMAL
	79	help
	80	This adds the CPUFreq driver for ST-Ericsson Ux500 (DB8500) SoC
	81	series.
	82
a0ea048a	83	config ARM_IMX6Q_CPUFREQ
1d0eaae9 SG	84	tristate "Freescale i.MX6 cpufreq support"
1d0eaae9 SG	85	depends on ARCH_MXC
a0ea048a	86	depends on REGULATOR_ANATOP
7e021687	87	select PM_OPP
a0ea048a	88	help
1d0eaae9	89	This adds cpufreq driver support for Freescale i.MX6 series SoCs.
a0ea048a VK	90
	91	If in doubt, say N.
	92
	93	config ARM_KIRKWOOD_CPUFREQ
6c8df11d	94	def_bool MACH_KIRKWOOD
a0ea048a VK	95	help
	96	This adds the CPUFreq driver for Marvell Kirkwood
	97	SoCs.
	98
1453863f	99	config ARM_MT8173_CPUFREQ
3c2002ae	100	tristate "Mediatek MT8173 CPUFreq support"
1453863f	101	depends on ARCH_MEDIATEK && REGULATOR
2d4ee303	102	depends on ARM64 \|\| (ARM_CPU_TOPOLOGY && COMPILE_TEST)
3c2002ae	103	depends on !CPU_THERMAL \|\| THERMAL
1453863f PCC	104	select PM_OPP
	105	help
	106	This adds the CPUFreq driver support for Mediatek MT8173 SoC.
	107
b09db45c RK	108	config ARM_OMAP2PLUS_CPUFREQ
b09db45c RK	109	bool "TI OMAP2+"
2d59dcfb	110	depends on ARCH_OMAP2PLUS
b09db45c	111	default ARCH_OMAP2PLUS
b09db45c	112
f023f8dd VK	113	config ARM_S3C_CPUFREQ
	114	bool
	115	help
	116	Internal configuration node for common cpufreq on Samsung SoC
	117
	118	config ARM_S3C24XX_CPUFREQ
	119	bool "CPUfreq driver for Samsung S3C24XX series CPUs (EXPERIMENTAL)"
	120	depends on ARCH_S3C24XX
	121	select ARM_S3C_CPUFREQ
	122	help
	123	This enables the CPUfreq driver for the Samsung S3C24XX family
	124	of CPUs.
	125
	126	For details, take a look at <file:Documentation/cpu-freq>.
	127
	128	If in doubt, say N.
	129
	130	config ARM_S3C24XX_CPUFREQ_DEBUG
	131	bool "Debug CPUfreq Samsung driver core"
	132	depends on ARM_S3C24XX_CPUFREQ
	133	help
	134	Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
	135
	136	config ARM_S3C24XX_CPUFREQ_IODEBUG
	137	bool "Debug CPUfreq Samsung driver IO timing"
	138	depends on ARM_S3C24XX_CPUFREQ
	139	help
	140	Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
	141
	142	config ARM_S3C24XX_CPUFREQ_DEBUGFS
	143	bool "Export debugfs for CPUFreq"
	144	depends on ARM_S3C24XX_CPUFREQ && DEBUG_FS
	145	help
	146	Export status information via debugfs.
	147
	148	config ARM_S3C2410_CPUFREQ
	149	bool
	150	depends on ARM_S3C24XX_CPUFREQ && CPU_S3C2410
	151	select S3C2410_CPUFREQ_UTILS
	152	help
	153	CPU Frequency scaling support for S3C2410
	154
	155	config ARM_S3C2412_CPUFREQ
	156	bool
	157	depends on ARM_S3C24XX_CPUFREQ && CPU_S3C2412
	158	default y
	159	select S3C2412_IOTIMING
	160	help
	161	CPU Frequency scaling support for S3C2412 and S3C2413 SoC CPUs.
	162
34ee5507 HS	163	config ARM_S3C2416_CPUFREQ
	164	bool "S3C2416 CPU Frequency scaling support"
	165	depends on CPU_S3C2416
	166	help
	167	This adds the CPUFreq driver for the Samsung S3C2416 and
	168	S3C2450 SoC. The S3C2416 supports changing the rate of the
	169	armdiv clock source and also entering a so called dynamic
	170	voltage scaling mode in which it is possible to reduce the
735dc249	171	core voltage of the CPU.
34ee5507 HS	172
	173	If in doubt, say N.
	174
	175	config ARM_S3C2416_CPUFREQ_VCORESCALE
0f194b56 KC	176	bool "Allow voltage scaling for S3C2416 arm core"
0f194b56 KC	177	depends on ARM_S3C2416_CPUFREQ && REGULATOR
34ee5507 HS	178	help
	179	Enable CPU voltage scaling when entering the dvs mode.
	180	It uses information gathered through existing hardware and
	181	tests but not documented in any datasheet.
	182
	183	If in doubt, say N.
	184
f023f8dd VK	185	config ARM_S3C2440_CPUFREQ
	186	bool "S3C2440/S3C2442 CPU Frequency scaling support"
	187	depends on ARM_S3C24XX_CPUFREQ && (CPU_S3C2440 \|\| CPU_S3C2442)
	188	select S3C2410_CPUFREQ_UTILS
	189	default y
	190	help
	191	CPU Frequency scaling support for S3C2440 and S3C2442 SoC CPUs.
	192
15964d38 KK	193	config ARM_S3C64XX_CPUFREQ
	194	bool "Samsung S3C64XX"
	195	depends on CPU_S3C6410
	196	default y
	197	help
	198	This adds the CPUFreq driver for Samsung S3C6410 SoC.
	199
	200	If in doubt, say N.
	201
f7d77079 KK	202	config ARM_S5PV210_CPUFREQ
	203	bool "Samsung S5PV210 and S5PC110"
	204	depends on CPU_S5PV210
	205	default y
	206	help
	207	This adds the CPUFreq driver for Samsung S5PV210 and
	208	S5PC110 SoCs.
	209
	210	If in doubt, say N.
	211
59a2e613 VK	212	config ARM_SA1100_CPUFREQ
	213	bool
	214
	215	config ARM_SA1110_CPUFREQ
	216	bool
	217
8def3103 SH	218	config ARM_SCPI_CPUFREQ
8def3103 SH	219	tristate "SCPI based CPUfreq driver"
73124ced	220	depends on ARM_BIG_LITTLE_CPUFREQ && ARM_SCPI_PROTOCOL && COMMON_CLK_SCPI
8def3103 SH	221	help
	222	This adds the CPUfreq driver support for ARM big.LITTLE platforms
	223	using SCPI protocol for CPU power management.
	224
	225	This driver uses SCPI Message Protocol driver to interact with the
	226	firmware providing the CPU DVFS functionality.
	227
42099322 DS	228	config ARM_SPEAR_CPUFREQ
	229	bool "SPEAr CPUFreq support"
	230	depends on PLAT_SPEAR
	231	default y
	232	help
	233	This adds the CPUFreq driver support for SPEAr SOCs.
dbb8d76e	234
ab0ea257 LJ	235	config ARM_STI_CPUFREQ
	236	tristate "STi CPUFreq support"
	237	depends on SOC_STIH407
	238	help
	239	This driver uses the generic OPP framework to match the running
	240	platform with a predefined set of suitable values. If not provided
	241	we will fall-back so safe-values contained in Device Tree. Enable
	242	this config option if you wish to add CPUFreq support for STi based
	243	SoCs.
	244
109e13ea TT	245	config ARM_TEGRA20_CPUFREQ
109e13ea TT	246	bool "Tegra20 CPUFreq support"
dbb8d76e	247	depends on ARCH_TEGRA
dbb8d76e VK	248	default y
dbb8d76e VK	249	help
109e13ea	250	This adds the CPUFreq driver support for Tegra20 SOCs.
608eab22	251
9eb15dbb TT	252	config ARM_TEGRA124_CPUFREQ
9eb15dbb TT	253	tristate "Tegra124 CPUFreq support"
b5832e4b	254	depends on ARCH_TEGRA && CPUFREQ_DT && REGULATOR
9eb15dbb TT	255	default y
	256	help
	257	This adds the CPUFreq driver support for Tegra124 SOCs.
	258
939dc6f5 MP	259	config ARM_TEGRA186_CPUFREQ
	260	tristate "Tegra186 CPUFreq support"
	261	depends on ARCH_TEGRA && TEGRA_BPMP
	262	help
	263	This adds the CPUFreq driver support for Tegra186 SOCs.
	264
e13cf046 DG	265	config ARM_TI_CPUFREQ
	266	bool "Texas Instruments CPUFreq support"
	267	depends on ARCH_OMAP2PLUS
	268	help
	269	This driver enables valid OPPs on the running platform based on
	270	values contained within the SoC in use. Enable this in order to
	271	use the cpufreq-dt driver on all Texas Instruments platforms that
	272	provide dt based operating-points-v2 tables with opp-supported-hw
	273	data provided. Required for cpufreq support on AM335x, AM437x,
	274	DRA7x, and AM57x platforms.
	275
608eab22 PC	276	config ARM_PXA2xx_CPUFREQ
	277	tristate "Intel PXA2xx CPUfreq driver"
	278	depends on PXA27x \|\| PXA25x
	279	help
	280	This add the CPUFreq driver support for Intel PXA2xx SOCs.
	281
	282	If in doubt, say N.
5477fb3b AC	283
	284	config ACPI_CPPC_CPUFREQ
	285	tristate "CPUFreq driver based on the ACPI CPPC spec"
a578884f	286	depends on ACPI_PROCESSOR
5477fb3b AC	287	select ACPI_CPPC_LIB
	288	default n
	289	help
	290	This adds a CPUFreq driver which uses CPPC methods
	291	as described in the ACPIv5.1 spec. CPPC stands for
	292	Collaborative Processor Performance Controls. It
	293	is based on an abstract continuous scale of CPU
	294	performance values which allows the remote power
	295	processor to flexibly optimize for power and
	296	performance. CPPC relies on power management firmware
	297	support for its operation.
	298
	299	If in doubt, say N.