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Message-Id: <20241210144945.2325330-12-arnd@kernel.org> Date: Tue, 10 Dec 2024 15:49:45 +0100 From: Arnd Bergmann <arnd@...nel.org> To: linux-kernel@...r.kernel.org, x86@...nel.org Cc: Arnd Bergmann <arnd@...db.de>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Andy Shevchenko <andy@...nel.org>, Matthew Wilcox <willy@...radead.org> Subject: [PATCH v2 11/11] x86: Move platforms to Kconfig.platforms From: Arnd Bergmann <arnd@...db.de> The x86 platform options in Kconfig are rather confusing, as they are a mix of options that just control visibility of drivers and those that are fundamental to the operation, with some of the code in arch/x86/platforms and other code in drivers/platform/x86, and the options listed in various places in arch/x86/Kconfig. Make this a little more consistent by moving all options that control a platform from arch/x86/Kconfig to arch/x86/Kconfig.platforms and put them into a submenu. Signed-off-by: Arnd Bergmann <arnd@...db.de> --- arch/x86/Kconfig | 363 +------------------------------------ arch/x86/Kconfig.platforms | 361 ++++++++++++++++++++++++++++++++++++ 2 files changed, 363 insertions(+), 361 deletions(-) create mode 100644 arch/x86/Kconfig.platforms diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index fb071548bc1e..98530ce14eab 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -526,205 +526,7 @@ config X86_FRED ring transitions and exception/interrupt handling if the system supports it. -config X86_EXTENDED_PLATFORM - bool "Support for extended (non-PC) x86 platforms" - default y - help - If you disable this option then the kernel will only support - standard PC platforms. (which covers the vast majority of - systems out there.) - - If you enable this option then you'll be able to select support - for the following non-PC x86 platforms, depending on the value of - CONFIG_64BIT. - - 32-bit platforms (CONFIG_64BIT=n): - Goldfish (Android emulator) - AMD Elan - RDC R-321x SoC - SGI 320/540 (Visual Workstation) - - 64-bit platforms (CONFIG_64BIT=y): - Numascale NumaChip - ScaleMP vSMP - SGI Ultraviolet - Merrifield/Moorefield MID devices - - If you have one of these systems, or if you want to build a - generic distribution kernel, say Y here - otherwise say N. - -# This is an alphabetically sorted list of 64 bit extended platforms -# Please maintain the alphabetic order if and when there are additions -config X86_NUMACHIP - bool "Numascale NumaChip" - depends on X86_64 - depends on X86_EXTENDED_PLATFORM - depends on NUMA - depends on SMP - depends on X86_X2APIC - depends on PCI_MMCONFIG - help - Adds support for Numascale NumaChip large-SMP systems. Needed to - enable more than ~168 cores. - If you don't have one of these, you should say N here. - -config X86_VSMP - bool "ScaleMP vSMP" - select HYPERVISOR_GUEST - select PARAVIRT - depends on X86_64 && PCI - depends on X86_EXTENDED_PLATFORM - depends on SMP - help - Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is - supposed to run on these EM64T-based machines. Only choose this option - if you have one of these machines. - -config X86_UV - bool "SGI Ultraviolet" - depends on X86_64 - depends on X86_EXTENDED_PLATFORM - depends on NUMA - depends on EFI - depends on KEXEC_CORE - depends on X86_X2APIC - depends on PCI - help - This option is needed in order to support SGI Ultraviolet systems. - If you don't have one of these, you should say N here. - -config X86_INTEL_MID - bool "Intel Z34xx/Z35xx MID platform support" - depends on X86_EXTENDED_PLATFORM - depends on X86_PLATFORM_DEVICES - depends on PCI - depends on X86_64 || (EXPERT && PCI_GOANY) - depends on X86_IO_APIC - select I2C - select DW_APB_TIMER - select INTEL_SCU_PCI - help - Select to build a kernel capable of supporting 64-bit Intel MID - (Mobile Internet Device) platform systems which do not have - the PCI legacy interfaces. - - The only supported devices are the 22nm Merrified (Z34xx) - and Moorefield (Z35xx) SoC used in the Intel Edison board and - a small number of Android devices such as the Asus Zenfone 2, - Asus FonePad 8 and Dell Venue 7. - - If you are building for a PC class system or non-MID tablet - SoCs like Bay Trail (Z36xx/Z37xx), say N here. - - Intel MID platforms are based on an Intel processor and chipset which - consume less power than most of the x86 derivatives. - -config X86_GOLDFISH - bool "Goldfish (Virtual Platform)" - depends on X86_EXTENDED_PLATFORM - help - Enable support for the Goldfish virtual platform used primarily - for Android development. Unless you are building for the Android - Goldfish emulator say N here. - -# Following is an alphabetically sorted list of 32 bit extended platforms -# Please maintain the alphabetic order if and when there are additions - -config X86_INTEL_CE - bool "CE4100 TV platform" - depends on PCI - depends on PCI_GODIRECT - depends on X86_IO_APIC - depends on X86_32 - depends on X86_EXTENDED_PLATFORM - select X86_REBOOTFIXUPS - select OF - select OF_EARLY_FLATTREE - help - Select for the Intel CE media processor (CE4100) SOC. - This option compiles in support for the CE4100 SOC for settop - boxes and media devices. - -config X86_INTEL_QUARK - bool "Intel Quark platform support" - depends on X86_32 - depends on X86_EXTENDED_PLATFORM - depends on X86_PLATFORM_DEVICES - depends on X86_TSC - depends on PCI - depends on PCI_GOANY - depends on X86_IO_APIC - select IOSF_MBI - select INTEL_IMR - select COMMON_CLK - help - Select to include support for Quark X1000 SoC. - Say Y here if you have a Quark based system such as the Arduino - compatible Intel Galileo. - -config X86_INTEL_LPSS - bool "Intel Low Power Subsystem Support" - depends on X86 && ACPI && PCI - select COMMON_CLK - select PINCTRL - select IOSF_MBI - help - Select to build support for Intel Low Power Subsystem such as - found on Intel Lynxpoint PCH. Selecting this option enables - things like clock tree (common clock framework) and pincontrol - which are needed by the LPSS peripheral drivers. - -config X86_AMD_PLATFORM_DEVICE - bool "AMD ACPI2Platform devices support" - depends on ACPI - select COMMON_CLK - select PINCTRL - help - Select to interpret AMD specific ACPI device to platform device - such as I2C, UART, GPIO found on AMD Carrizo and later chipsets. - I2C and UART depend on COMMON_CLK to set clock. GPIO driver is - implemented under PINCTRL subsystem. - -config IOSF_MBI - tristate "Intel SoC IOSF Sideband support for SoC platforms" - depends on PCI - help - This option enables sideband register access support for Intel SoC - platforms. On these platforms the IOSF sideband is used in lieu of - MSR's for some register accesses, mostly but not limited to thermal - and power. Drivers may query the availability of this device to - determine if they need the sideband in order to work on these - platforms. The sideband is available on the following SoC products. - This list is not meant to be exclusive. - - BayTrail - - Braswell - - Quark - - You should say Y if you are running a kernel on one of these SoC's. - -config IOSF_MBI_DEBUG - bool "Enable IOSF sideband access through debugfs" - depends on IOSF_MBI && DEBUG_FS - help - Select this option to expose the IOSF sideband access registers (MCR, - MDR, MCRX) through debugfs to write and read register information from - different units on the SoC. This is most useful for obtaining device - state information for debug and analysis. As this is a general access - mechanism, users of this option would have specific knowledge of the - device they want to access. - - If you don't require the option or are in doubt, say N. - -config X86_RDC321X - bool "RDC R-321x SoC" - depends on X86_32 - depends on X86_EXTENDED_PLATFORM - select M486 - select X86_REBOOTFIXUPS - help - This option is needed for RDC R-321x system-on-chip, also known - as R-8610-(G). - If you don't have one of these chips, you should say N here. +source "arch/x86/Kconfig.platforms" config X86_SUPPORTS_MEMORY_FAILURE def_bool y @@ -735,19 +537,6 @@ config X86_SUPPORTS_MEMORY_FAILURE depends on X86_64 || !SPARSEMEM select ARCH_SUPPORTS_MEMORY_FAILURE -config X86_32_IRIS - tristate "Eurobraille/Iris poweroff module" - depends on X86_32 - help - The Iris machines from EuroBraille do not have APM or ACPI support - to shut themselves down properly. A special I/O sequence is - needed to do so, which is what this module does at - kernel shutdown. - - This is only for Iris machines from EuroBraille. - - If unused, say N. - config SCHED_OMIT_FRAME_POINTER def_bool y prompt "Single-depth WCHAN output" @@ -1275,39 +1064,6 @@ config X86_IOPL_IOPERM ability to disable interrupts from user space which would be granted if the hardware IOPL mechanism would be used. -config TOSHIBA - tristate "Toshiba Laptop support" - depends on X86_32 - help - This adds a driver to safely access the System Management Mode of - the CPU on Toshiba portables with a genuine Toshiba BIOS. It does - not work on models with a Phoenix BIOS. The System Management Mode - is used to set the BIOS and power saving options on Toshiba portables. - - For information on utilities to make use of this driver see the - Toshiba Linux utilities web site at: - <http://www.buzzard.org.uk/toshiba/>. - - Say Y if you intend to run this kernel on a Toshiba portable. - Say N otherwise. - -config X86_REBOOTFIXUPS - bool "Enable X86 board specific fixups for reboot" - depends on X86_32 - help - This enables chipset and/or board specific fixups to be done - in order to get reboot to work correctly. This is only needed on - some combinations of hardware and BIOS. The symptom, for which - this config is intended, is when reboot ends with a stalled/hung - system. - - Currently, the only fixup is for the Geode machines using - CS5530A and CS5536 chipsets and the RDC R-321x SoC. - - Say Y if you want to enable the fixup. Currently, it's safe to - enable this option even if you don't need it. - Say N otherwise. - config MICROCODE def_bool y depends on CPU_SUP_AMD || CPU_SUP_INTEL @@ -2927,10 +2683,9 @@ config ISA_DMA_API Enables ISA-style DMA support for devices requiring such controllers. If unsure, say Y. -if X86_32 - config ISA bool "ISA support" + depends on X86_32 help Find out whether you have ISA slots on your motherboard. ISA is the name of a bus system, i.e. the way the CPU talks to the other stuff @@ -2938,120 +2693,6 @@ config ISA (MCA) or VESA. ISA is an older system, now being displaced by PCI; newer boards don't support it. If you have ISA, say Y, otherwise N. -config SCx200 - tristate "NatSemi SCx200 support" - help - This provides basic support for National Semiconductor's - (now AMD's) Geode processors. The driver probes for the - PCI-IDs of several on-chip devices, so its a good dependency - for other scx200_* drivers. - - If compiled as a module, the driver is named scx200. - -config SCx200HR_TIMER - tristate "NatSemi SCx200 27MHz High-Resolution Timer Support" - depends on SCx200 - default y - help - This driver provides a clocksource built upon the on-chip - 27MHz high-resolution timer. Its also a workaround for - NSC Geode SC-1100's buggy TSC, which loses time when the - processor goes idle (as is done by the scheduler). The - other workaround is idle=poll boot option. - -config OLPC - bool "One Laptop Per Child support" - depends on !X86_PAE - select GPIOLIB - select OF - select OF_PROMTREE - select IRQ_DOMAIN - select OLPC_EC - help - Add support for detecting the unique features of the OLPC - XO hardware. - -config OLPC_XO1_PM - bool "OLPC XO-1 Power Management" - depends on OLPC && MFD_CS5535=y && PM_SLEEP - help - Add support for poweroff and suspend of the OLPC XO-1 laptop. - -config OLPC_XO1_RTC - bool "OLPC XO-1 Real Time Clock" - depends on OLPC_XO1_PM && RTC_DRV_CMOS - help - Add support for the XO-1 real time clock, which can be used as a - programmable wakeup source. - -config OLPC_XO1_SCI - bool "OLPC XO-1 SCI extras" - depends on OLPC && OLPC_XO1_PM && GPIO_CS5535=y - depends on INPUT=y - select POWER_SUPPLY - help - Add support for SCI-based features of the OLPC XO-1 laptop: - - EC-driven system wakeups - - Power button - - Ebook switch - - Lid switch - - AC adapter status updates - - Battery status updates - -config OLPC_XO15_SCI - bool "OLPC XO-1.5 SCI extras" - depends on OLPC && ACPI - select POWER_SUPPLY - help - Add support for SCI-based features of the OLPC XO-1.5 laptop: - - EC-driven system wakeups - - AC adapter status updates - - Battery status updates - -config GEODE_COMMON - bool - -config ALIX - bool "PCEngines ALIX System Support (LED setup)" - select GPIOLIB - select GEODE_COMMON - help - This option enables system support for the PCEngines ALIX. - At present this just sets up LEDs for GPIO control on - ALIX2/3/6 boards. However, other system specific setup should - get added here. - - Note: You must still enable the drivers for GPIO and LED support - (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs - - Note: You have to set alix.force=1 for boards with Award BIOS. - -config NET5501 - bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)" - select GPIOLIB - select GEODE_COMMON - help - This option enables system support for the Soekris Engineering net5501. - -config GEOS - bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)" - select GPIOLIB - select GEODE_COMMON - depends on DMI - help - This option enables system support for the Traverse Technologies GEOS. - -config TS5500 - bool "Technologic Systems TS-5500 platform support" - depends on MELAN - select CHECK_SIGNATURE - select NEW_LEDS - select LEDS_CLASS - help - This option enables system support for the Technologic Systems TS-5500. - -endif # X86_32 - config AMD_NB def_bool y depends on CPU_SUP_AMD && PCI diff --git a/arch/x86/Kconfig.platforms b/arch/x86/Kconfig.platforms new file mode 100644 index 000000000000..cac6753bacea --- /dev/null +++ b/arch/x86/Kconfig.platforms @@ -0,0 +1,361 @@ +menu "Platform selection" + +config X86_EXTENDED_PLATFORM + bool "Support for extended (non-PC) x86 platforms" + default y + help + If you disable this option then the kernel will only support + standard PC platforms. (which covers the vast majority of + systems out there.) + + If you enable this option then you'll be able to select support + for the following non-PC x86 platforms, depending on the value of + CONFIG_64BIT. + + 32-bit platforms (CONFIG_64BIT=n): + Intel CE4100 + Intel Quark + AMD Geode + AMD Elan + RDC R-321x + + 64-bit platforms (CONFIG_64BIT=y): + Numascale NumaChip + ScaleMP vSMP + SGI Ultraviolet + Merrifield/Moorefield MID devices + Goldfish (Android emulator) + + If you have one of these systems, or if you want to build a + generic distribution kernel, say Y here - otherwise say N. + +# This is an alphabetically sorted list of 64 bit extended platforms +# Please maintain the alphabetic order if and when there are additions +config X86_NUMACHIP + bool "Numascale NumaChip" + depends on X86_64 + depends on X86_EXTENDED_PLATFORM + depends on NUMA + depends on SMP + depends on X86_X2APIC + depends on PCI_MMCONFIG + help + Adds support for Numascale NumaChip large-SMP systems. Needed to + enable more than ~168 cores. + If you don't have one of these, you should say N here. + +config X86_VSMP + bool "ScaleMP vSMP" + select HYPERVISOR_GUEST + select PARAVIRT + depends on X86_64 && PCI + depends on X86_EXTENDED_PLATFORM + depends on SMP + help + Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is + supposed to run on these EM64T-based machines. Only choose this option + if you have one of these machines. + +config X86_UV + bool "SGI Ultraviolet" + depends on X86_64 + depends on X86_EXTENDED_PLATFORM + depends on NUMA + depends on EFI + depends on KEXEC_CORE + depends on X86_X2APIC + depends on PCI + help + This option is needed in order to support SGI Ultraviolet systems. + If you don't have one of these, you should say N here. + +config X86_INTEL_MID + bool "Intel Z34xx/Z35xx MID platform support" + depends on X86_EXTENDED_PLATFORM + depends on X86_PLATFORM_DEVICES + depends on PCI + depends on X86_64 || (EXPERT && PCI_GOANY) + depends on X86_IO_APIC + select I2C + select DW_APB_TIMER + select INTEL_SCU_PCI + help + Select to build a kernel capable of supporting 64-bit Intel MID + (Mobile Internet Device) platform systems which do not have + the PCI legacy interfaces. + + The only supported devices are the 22nm Merrified (Z34xx) + and Moorefield (Z35xx) SoC used in the Intel Edison board and + a small number of Android devices such as the Asus Zenfone 2, + Asus FonePad 8 and Dell Venue 7. + + If you are building for a PC class system or non-MID tablet + SoCs like Bay Trail (Z36xx/Z37xx), say N here. + + Intel MID platforms are based on an Intel processor and chipset which + consume less power than most of the x86 derivatives. + +config X86_GOLDFISH + bool "Goldfish (Virtual Platform)" + depends on X86_EXTENDED_PLATFORM + help + Enable support for the Goldfish virtual platform used primarily + for Android development. Unless you are building for the Android + Goldfish emulator say N here. + +# Following is an alphabetically sorted list of 32 bit extended platforms +# Please maintain the alphabetic order if and when there are additions + +if X86_32 && X86_EXTENDED_PLATFORM + +config X86_INTEL_CE + bool "CE4100 TV platform" + depends on PCI + depends on PCI_GODIRECT + depends on X86_IO_APIC + select X86_REBOOTFIXUPS + select OF + select OF_EARLY_FLATTREE + help + Select for the Intel CE media processor (CE4100) SOC. + This option compiles in support for the CE4100 SOC for settop + boxes and media devices. + +config X86_INTEL_QUARK + bool "Intel Quark platform support" + depends on X86_PLATFORM_DEVICES + depends on X86_TSC + depends on PCI + depends on PCI_GOANY + depends on X86_IO_APIC + select IOSF_MBI + select INTEL_IMR + select COMMON_CLK + help + Select to include support for Quark X1000 SoC. + Say Y here if you have a Quark based system such as the Arduino + compatible Intel Galileo. + +config SCx200 + tristate "NatSemi SCx200 support" + help + This provides basic support for National Semiconductor's + (now AMD's) Geode processors. The driver probes for the + PCI-IDs of several on-chip devices, so its a good dependency + for other scx200_* drivers. + + If compiled as a module, the driver is named scx200. + +config SCx200HR_TIMER + tristate "NatSemi SCx200 27MHz High-Resolution Timer Support" + depends on SCx200 + default y + help + This driver provides a clocksource built upon the on-chip + 27MHz high-resolution timer. Its also a workaround for + NSC Geode SC-1100's buggy TSC, which loses time when the + processor goes idle (as is done by the scheduler). The + other workaround is idle=poll boot option. + +config OLPC + bool "One Laptop Per Child support" + depends on !X86_PAE + select GPIOLIB + select OF + select OF_PROMTREE + select IRQ_DOMAIN + select OLPC_EC + help + Add support for detecting the unique features of the OLPC + XO hardware. + +config OLPC_XO1_PM + bool "OLPC XO-1 Power Management" + depends on OLPC && MFD_CS5535=y && PM_SLEEP + help + Add support for poweroff and suspend of the OLPC XO-1 laptop. + +config OLPC_XO1_RTC + bool "OLPC XO-1 Real Time Clock" + depends on OLPC_XO1_PM && RTC_DRV_CMOS + help + Add support for the XO-1 real time clock, which can be used as a + programmable wakeup source. + +config OLPC_XO1_SCI + bool "OLPC XO-1 SCI extras" + depends on OLPC && OLPC_XO1_PM && GPIO_CS5535=y + depends on INPUT=y + select POWER_SUPPLY + help + Add support for SCI-based features of the OLPC XO-1 laptop: + - EC-driven system wakeups + - Power button + - Ebook switch + - Lid switch + - AC adapter status updates + - Battery status updates + +config OLPC_XO15_SCI + bool "OLPC XO-1.5 SCI extras" + depends on OLPC && ACPI + select POWER_SUPPLY + help + Add support for SCI-based features of the OLPC XO-1.5 laptop: + - EC-driven system wakeups + - AC adapter status updates + - Battery status updates + +config GEODE_COMMON + bool + +config ALIX + bool "PCEngines ALIX System Support (LED setup)" + select GPIOLIB + select GEODE_COMMON + help + This option enables system support for the PCEngines ALIX. + At present this just sets up LEDs for GPIO control on + ALIX2/3/6 boards. However, other system specific setup should + get added here. + + Note: You must still enable the drivers for GPIO and LED support + (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs + + Note: You have to set alix.force=1 for boards with Award BIOS. + +config NET5501 + bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)" + select GPIOLIB + select GEODE_COMMON + help + This option enables system support for the Soekris Engineering net5501. + +config GEOS + bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)" + select GPIOLIB + select GEODE_COMMON + depends on DMI + help + This option enables system support for the Traverse Technologies GEOS. + +config TS5500 + bool "Technologic Systems TS-5500 platform support" + depends on MELAN + select CHECK_SIGNATURE + select NEW_LEDS + select LEDS_CLASS + help + This option enables system support for the Technologic Systems TS-5500. + +config X86_RDC321X + bool "RDC R-321x SoC" + select M486 + select X86_REBOOTFIXUPS + help + This option is needed for RDC R-321x system-on-chip, also known + as R-8610-(G). + If you don't have one of these chips, you should say N here. + +config X86_REBOOTFIXUPS + bool "Enable X86 board specific fixups for reboot" + depends on X86_32 + help + This enables chipset and/or board specific fixups to be done + in order to get reboot to work correctly. This is only needed on + some combinations of hardware and BIOS. The symptom, for which + this config is intended, is when reboot ends with a stalled/hung + system. + + Currently, the only fixup is for the Geode machines using + CS5530A and CS5536 chipsets and the RDC R-321x SoC. + + Say Y if you want to enable the fixup. Currently, it's safe to + enable this option even if you don't need it. + Say N otherwise. + +endif # X86_32 extended platform + +config TOSHIBA + tristate "Toshiba Laptop support" + depends on X86_32 + help + This adds a driver to safely access the System Management Mode of + the CPU on Toshiba portables with a genuine Toshiba BIOS. It does + not work on models with a Phoenix BIOS. The System Management Mode + is used to set the BIOS and power saving options on Toshiba portables. + + For information on utilities to make use of this driver see the + Toshiba Linux utilities web site at: + <http://www.buzzard.org.uk/toshiba/>. + + Say Y if you intend to run this kernel on a Toshiba portable. + Say N otherwise. + +config X86_32_IRIS + tristate "Eurobraille/Iris poweroff module" + depends on X86_32 + help + The Iris machines from EuroBraille do not have APM or ACPI support + to shut themselves down properly. A special I/O sequence is + needed to do so, which is what this module does at + kernel shutdown. + + This is only for Iris machines from EuroBraille. + + If unused, say N. + +config X86_INTEL_LPSS + bool "Intel Low Power Subsystem Support" + depends on X86 && ACPI && PCI + select COMMON_CLK + select PINCTRL + select IOSF_MBI + help + Select to build support for Intel Low Power Subsystem such as + found on Intel Lynxpoint PCH. Selecting this option enables + things like clock tree (common clock framework) and pincontrol + which are needed by the LPSS peripheral drivers. + +config X86_AMD_PLATFORM_DEVICE + bool "AMD ACPI2Platform devices support" + depends on ACPI + select COMMON_CLK + select PINCTRL + help + Select to interpret AMD specific ACPI device to platform device + such as I2C, UART, GPIO found on AMD Carrizo and later chipsets. + I2C and UART depend on COMMON_CLK to set clock. GPIO driver is + implemented under PINCTRL subsystem. + +config IOSF_MBI + tristate "Intel SoC IOSF Sideband support for SoC platforms" + depends on PCI + help + This option enables sideband register access support for Intel SoC + platforms. On these platforms the IOSF sideband is used in lieu of + MSR's for some register accesses, mostly but not limited to thermal + and power. Drivers may query the availability of this device to + determine if they need the sideband in order to work on these + platforms. The sideband is available on the following SoC products. + This list is not meant to be exclusive. + - BayTrail + - Braswell + - Quark + + You should say Y if you are running a kernel on one of these SoC's. + +config IOSF_MBI_DEBUG + bool "Enable IOSF sideband access through debugfs" + depends on IOSF_MBI && DEBUG_FS + help + Select this option to expose the IOSF sideband access registers (MCR, + MDR, MCRX) through debugfs to write and read register information from + different units on the SoC. This is most useful for obtaining device + state information for debug and analysis. As this is a general access + mechanism, users of this option would have specific knowledge of the + device they want to access. + + If you don't require the option or are in doubt, say N. + +endmenu -- 2.39.5
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