1 # SPDX-License-Identifier: GPL-2.0-only
3 # GPIO infrastructure and drivers
6 config ARCH_HAVE_CUSTOM_GPIO_H
9 Selecting this config option from the architecture Kconfig allows
10 the architecture to provide a custom asm/gpio.h implementation
11 overriding the default implementations. New uses of this are
17 This enables GPIO support through the generic GPIO library.
18 You only need to enable this, if you also want to enable
19 one or more of the GPIO drivers below.
25 config GPIOLIB_FASTPATH_LIMIT
26 int "Maximum number of GPIOs for fast path"
30 This adjusts the point at which certain APIs will switch from
31 using a stack allocated buffer to a dynamically allocated buffer.
33 You shouldn't need to change this unless you really need to
34 optimize either stack space or performance. Change this carefully
35 since setting an incorrect value could cause stack corruption.
46 config GPIOLIB_IRQCHIP
51 bool "Debug GPIO calls"
52 depends on DEBUG_KERNEL
54 Say Y here to add some extra checks and diagnostics to GPIO calls.
55 These checks help ensure that GPIOs have been properly initialized
56 before they are used, and that sleeping calls are not made from
57 non-sleeping contexts. They can make bitbanged serial protocols
58 slower. The diagnostics help catch the type of setup errors
59 that are most common when setting up new platforms or boards.
62 bool "/sys/class/gpio/... (sysfs interface)" if EXPERT
64 select GPIO_CDEV # We need to encourage the new ABI
66 Say Y here to add the legacy sysfs interface for GPIOs.
68 This ABI is deprecated. If you want to use GPIO from userspace,
69 use the character device /dev/gpiochipN with the appropriate
70 ioctl() operations instead.
74 prompt "Character device (/dev/gpiochipN) support" if EXPERT
77 Say Y here to add the character device /dev/gpiochipN interface
78 for GPIOs. The character device allows userspace to control GPIOs
79 using ioctl() operations.
81 Only say N if you are sure that the GPIO character device is not
87 bool "Support GPIO ABI Version 1"
91 Say Y here to support version 1 of the GPIO CDEV ABI.
93 This ABI version is deprecated.
94 Please use the latest ABI for new developments.
99 depends on HAS_IOMEM # Only for IOMEM drivers
106 # put drivers in the right section, in alphabetical order
108 # This symbol is selected by both I2C and SPI expanders
112 menu "Memory mapped GPIO drivers"
115 config GPIO_74XX_MMIO
116 tristate "GPIO driver for 74xx-ICs with MMIO access"
120 Say yes here to support GPIO functionality for 74xx-compatible ICs
121 with MMIO access. Compatible models include:
122 1 bit: 741G125 (Input), 741G74 (Output)
123 2 bits: 742G125 (Input), 7474 (Output)
124 4 bits: 74125 (Input), 74175 (Output)
125 6 bits: 74365 (Input), 74174 (Output)
126 8 bits: 74244 (Input), 74273 (Output)
127 16 bits: 741624 (Input), 7416374 (Output)
130 tristate "Altera GPIO"
132 select GPIOLIB_IRQCHIP
134 Say Y or M here to build support for the Altera PIO device.
136 If driver is built as a module it will be called gpio-altera.
139 tristate "AMD Promontory GPIO support"
143 driver for GPIO functionality on Promontory IOHub
144 Require ACPI ASL code to enumerate as a platform device.
147 tristate "Aspeed GPIO support"
148 depends on (ARCH_ASPEED || COMPILE_TEST) && OF_GPIO
149 select GPIOLIB_IRQCHIP
151 Say Y here to support Aspeed AST2400 and AST2500 GPIO controllers.
153 config GPIO_ASPEED_SGPIO
154 bool "Aspeed SGPIO support"
155 depends on (ARCH_ASPEED || COMPILE_TEST) && OF_GPIO
157 select GPIOLIB_IRQCHIP
159 Say Y here to support Aspeed AST2500 SGPIO functionality.
162 tristate "Atheros AR71XX/AR724X/AR913X GPIO support"
164 depends on ATH79 || COMPILE_TEST
166 select GPIOLIB_IRQCHIP
168 Select this option to enable GPIO driver for
169 Atheros AR71XX/AR724X/AR913X SoC devices.
171 config GPIO_RASPBERRYPI_EXP
172 tristate "Raspberry Pi 3 GPIO Expander"
173 default RASPBERRYPI_FIRMWARE
175 # Make sure not 'y' when RASPBERRYPI_FIRMWARE is 'm'. This can only
176 # happen when COMPILE_TEST=y, hence the added !RASPBERRYPI_FIRMWARE.
177 depends on (ARCH_BCM2835 && RASPBERRYPI_FIRMWARE) || (COMPILE_TEST && !RASPBERRYPI_FIRMWARE)
179 Turn on GPIO support for the expander on Raspberry Pi 3 boards, using
180 the firmware mailbox to communicate with VideoCore on BCM283x chips.
183 bool "Broadcom Kona GPIO"
184 depends on OF_GPIO && (ARCH_BCM_MOBILE || COMPILE_TEST)
186 Turn on GPIO support for Broadcom "Kona" chips.
188 config GPIO_BCM_XGS_IPROC
189 tristate "BRCM XGS iProc GPIO support"
190 depends on OF_GPIO && (ARCH_BCM_IPROC || COMPILE_TEST)
192 select GPIOLIB_IRQCHIP
193 default ARCH_BCM_IPROC
195 Say yes here to enable GPIO support for Broadcom XGS iProc SoCs.
198 tristate "BRCMSTB GPIO support"
199 default y if (ARCH_BRCMSTB || BMIPS_GENERIC)
200 depends on OF_GPIO && (ARCH_BRCMSTB || BMIPS_GENERIC || COMPILE_TEST)
204 Say yes here to enable GPIO support for Broadcom STB (BCM7XXX) SoCs.
207 tristate "Cadence GPIO support"
210 select GPIOLIB_IRQCHIP
212 Say yes here to enable support for Cadence GPIO controller.
215 tristate "CLPS711X GPIO support"
216 depends on ARCH_CLPS711X || COMPILE_TEST
219 Say yes here to support GPIO on CLPS711X SoCs.
222 bool "TI Davinci/Keystone GPIO support"
223 default y if ARCH_DAVINCI
224 depends on (ARM || ARM64) && (ARCH_DAVINCI || ARCH_KEYSTONE || ARCH_K3)
226 Say yes here to enable GPIO support for TI Davinci/Keystone SoCs.
229 tristate "Synopsys DesignWare APB GPIO driver"
231 select GPIOLIB_IRQCHIP
233 Say Y or M here to build support for the Synopsys DesignWare APB
237 tristate "Spreadtrum EIC support"
238 depends on ARCH_SPRD || COMPILE_TEST
240 select GPIOLIB_IRQCHIP
242 Say yes here to support Spreadtrum EIC device.
245 tristate "Emma Mobile GPIO"
246 depends on (ARCH_EMEV2 || COMPILE_TEST) && OF_GPIO
248 Say yes here to support GPIO on Renesas Emma Mobile SoCs.
252 depends on ARCH_EP93XX
254 select GPIOLIB_IRQCHIP
257 tristate "Support for GPIO pins on XR17V352/354/358"
258 depends on SERIAL_8250_EXAR
261 Selecting this option will enable handling of GPIO pins present
262 on Exar XR17V352/354/358 chips.
265 bool "GE FPGA based GPIO"
269 Support for common GPIO functionality provided on some GE Single Board
272 This driver provides basic support (configure as input or output, read
273 and write pin state) for GPIO implemented in a number of GE single
276 config GPIO_FTGPIO010
277 bool "Faraday FTGPIO010 GPIO"
280 select GPIOLIB_IRQCHIP
281 default (ARCH_GEMINI || ARCH_MOXART)
283 Support for common GPIOs from the Faraday FTGPIO010 IP core, found in
284 Cortina systems Gemini platforms, Moxa ART and others.
286 config GPIO_GENERIC_PLATFORM
287 tristate "Generic memory-mapped GPIO controller support (MMIO platform device)"
290 Say yes here to support basic platform_device memory-mapped GPIO controllers.
293 tristate "Aeroflex Gaisler GRGPIO support"
298 Select this to support Aeroflex Gaisler GRGPIO cores from the GRLIB
299 VHDL IP core library.
302 tristate "HiSilicon GPIO controller driver"
303 depends on (ARM64 && ACPI) || COMPILE_TEST
305 select GPIOLIB_IRQCHIP
307 Say Y or M here to build support for the HiSilicon GPIO controller
309 This GPIO controller support double-edge interrupt and multi-core
313 tristate "Nintendo Wii (Hollywood) GPIO"
316 select GPIOLIB_IRQCHIP
318 Select this to support the GPIO controller of the Nintendo Wii.
323 tristate "Intel ICH GPIO"
324 depends on PCI && X86
328 Say yes here to support the GPIO functionality of a number of Intel
329 ICH-based chipsets. Currently supported devices: ICH6, ICH7, ICH8
330 ICH9, ICH10, Series 5/3400 (eg Ibex Peak), Series 6/C200 (eg
331 Cougar Point), NM10 (Tiger Point), and 3100 (Whitmore Lake).
336 tristate "Intel IOP GPIO"
337 depends on ARCH_IOP32X || COMPILE_TEST
340 Say yes here to support the GPIO functionality of a number of Intel
346 bool "Intel IXP4xx GPIO"
347 depends on ARM # For <asm/mach-types.h>
348 depends on ARCH_IXP4XX
350 select GPIOLIB_IRQCHIP
351 select IRQ_DOMAIN_HIERARCHY
353 Say yes here to support the GPIO functionality of a number of Intel
354 IXP4xx series of chips.
358 tristate "Xylon LogiCVC GPIO support"
359 depends on MFD_SYSCON && OF
361 Say yes here to support GPIO functionality of the Xylon LogiCVC
362 programmable logic block.
365 bool "Loongson-2/3 GPIO support"
366 depends on CPU_LOONGSON2EF || CPU_LOONGSON64
368 driver for GPIO functionality on Loongson-2F/3A/3B processors.
371 tristate "NXP LPC18XX/43XX GPIO support"
372 default y if ARCH_LPC18XX
373 depends on OF_GPIO && (ARCH_LPC18XX || COMPILE_TEST)
374 select IRQ_DOMAIN_HIERARCHY
376 Select this option to enable GPIO driver for
377 NXP LPC18XX/43XX devices.
380 tristate "NXP LPC32XX GPIO support"
381 depends on OF_GPIO && (ARCH_LPC32XX || COMPILE_TEST)
383 Select this option to enable GPIO driver for
387 tristate "GPIO support for Fujitsu MB86S7x Platforms"
389 Say yes here to support the GPIO controller in Fujitsu MB86S70 SoCs.
392 tristate "MEN 16Z127 GPIO support"
396 Say yes here to support the MEN 16Z127 GPIO Controller
398 config GPIO_MM_LANTIQ
399 bool "Lantiq Memory mapped GPIOs"
400 depends on LANTIQ && SOC_XWAY
402 This enables support for memory mapped GPIOs on the External Bus Unit
403 (EBU) found on Lantiq SoCs. The gpios are output only as they are
404 created by attaching a 16bit latch to the bus.
408 depends on PPC_MPC52xx
411 bool "MPC512x/MPC8xxx/QorIQ GPIO support"
412 depends on PPC_MPC512x || PPC_MPC831x || PPC_MPC834x || PPC_MPC837x || \
413 FSL_SOC_BOOKE || PPC_86xx || ARCH_LAYERSCAPE || ARM || \
418 Say Y here if you're going to use hardware that connects to the
419 MPC512x/831x/834x/837x/8572/8610/QorIQ GPIOs.
422 bool "Mediatek MT7621 GPIO Support"
423 depends on SOC_MT7620 || SOC_MT7621 || COMPILE_TEST
426 select GPIOLIB_IRQCHIP
428 Say yes here to support the Mediatek MT7621 SoC GPIO device
432 depends on PLAT_ORION || ARCH_MVEBU
434 select GENERIC_IRQ_CHIP
438 tristate "i.MX GPIO support"
439 depends on ARCH_MXC || COMPILE_TEST
441 select GENERIC_IRQ_CHIP
444 bool "Freescale MXS GPIO support" if COMPILE_TEST
445 depends on ARCH_MXS || COMPILE_TEST
446 default y if ARCH_MXS
448 select GENERIC_IRQ_CHIP
451 tristate "Cavium OCTEON GPIO"
452 depends on CAVIUM_OCTEON_SOC
455 Say yes here to support the on-chip GPIO lines on the OCTEON
459 tristate "TI OMAP GPIO support" if ARCH_OMAP2PLUS || COMPILE_TEST
460 default y if ARCH_OMAP
462 select GENERIC_IRQ_CHIP
463 select GPIOLIB_IRQCHIP
465 Say yes here to enable GPIO support for TI OMAP SoCs.
468 tristate "PrimeCell PL061 GPIO support"
471 select GPIOLIB_IRQCHIP
473 Say yes here to support the PrimeCell PL061 GPIO device
475 config GPIO_PMIC_EIC_SPRD
476 tristate "Spreadtrum PMIC EIC support"
477 depends on MFD_SC27XX_PMIC || COMPILE_TEST
479 select GPIOLIB_IRQCHIP
481 Say yes here to support Spreadtrum PMIC EIC device.
484 bool "PXA GPIO support"
485 depends on ARCH_PXA || ARCH_MMP || COMPILE_TEST
487 Say yes here to support the PXA GPIO device
490 tristate "Renesas R-Car and RZ/G GPIO support"
491 depends on ARCH_RENESAS || COMPILE_TEST
492 select GPIOLIB_IRQCHIP
494 Say yes here to support GPIO on Renesas R-Car or RZ/G SoCs.
497 bool "RDA Micro GPIO controller support"
498 depends on ARCH_RDA || COMPILE_TEST
501 select GPIOLIB_IRQCHIP
503 Say Y here to support RDA Micro GPIO controller.
508 A 32-bit single register GPIO fixed in/out implementation. This
509 can be used to represent any register as a set of GPIO signals.
511 config GPIO_SAMA5D2_PIOBU
512 tristate "SAMA5D2 PIOBU GPIO support"
513 depends on MFD_SYSCON
517 Say yes here to use the PIOBU pins as GPIOs.
519 PIOBU pins on the SAMA5D2 can be used as GPIOs.
520 The difference from regular GPIOs is that they
521 maintain their value during backup/self-refresh.
524 bool "SiFive GPIO support"
526 select IRQ_DOMAIN_HIERARCHY
528 select GPIOLIB_IRQCHIP
531 Say yes here to support the GPIO device on SiFive SoCs.
534 tristate "SIOX GPIO support"
536 select GPIOLIB_IRQCHIP
538 Say yes here to support SIOX I/O devices. These are units connected
539 via a SIOX bus and have a number of fixed-direction I/O lines.
541 config GPIO_SNPS_CREG
542 bool "Synopsys GPIO via CREG (Control REGisters) driver"
543 depends on ARC || COMPILE_TEST
546 This driver supports GPIOs via CREG on various Synopsys SoCs.
547 This is a single-register MMIO GPIO driver for complex cases
548 where only several fields in register belong to GPIO lines and
549 each GPIO line owns a field with different length and on/off value.
551 config GPIO_SPEAR_SPICS
552 bool "ST SPEAr13xx SPI Chip Select as GPIO support"
553 depends on PLAT_SPEAR
554 select GENERIC_IRQ_CHIP
556 Say yes here to support ST SPEAr SPI Chip Select as GPIO device
559 tristate "Spreadtrum GPIO support"
560 depends on ARCH_SPRD || COMPILE_TEST
562 select GPIOLIB_IRQCHIP
564 Say yes here to support Spreadtrum GPIO device.
567 bool "STA2x11/ConneXt GPIO support"
568 depends on MFD_STA2X11
569 select GENERIC_IRQ_CHIP
571 Say yes here to support the STA2x11/ConneXt GPIO device.
572 The GPIO module has 128 GPIO pins with alternate functions.
575 bool "XWAY STP GPIOs"
576 depends on SOC_XWAY || COMPILE_TEST
579 This enables support for the Serial To Parallel (STP) unit found on
580 XWAY SoC. The STP allows the SoC to drive a shift registers cascade,
581 that can be up to 24 bit. This peripheral is aimed at driving leds.
582 Some of the gpios/leds can be auto updated by the soc with dsl and
586 tristate "GPIO based on SYSCON"
587 depends on MFD_SYSCON && OF
589 Say yes here to support GPIO functionality though SYSCON driver.
594 select GENERIC_IRQ_CHIP
598 tristate "NVIDIA Tegra GPIO support"
600 depends on ARCH_TEGRA || COMPILE_TEST
602 select GPIOLIB_IRQCHIP
603 select IRQ_DOMAIN_HIERARCHY
605 Say yes here to support GPIO pins on NVIDIA Tegra SoCs.
608 tristate "NVIDIA Tegra186 GPIO support"
609 default ARCH_TEGRA_186_SOC || ARCH_TEGRA_194_SOC
610 depends on ARCH_TEGRA_186_SOC || ARCH_TEGRA_194_SOC || COMPILE_TEST
612 select GPIOLIB_IRQCHIP
613 select IRQ_DOMAIN_HIERARCHY
615 Say yes here to support GPIO pins on NVIDIA Tegra186 SoCs.
618 tristate "TS-4800 DIO blocks and compatibles"
620 depends on SOC_IMX51 || COMPILE_TEST
623 This driver support TS-4800 FPGA GPIO controllers.
626 tristate "Cavium ThunderX/OCTEON-TX GPIO"
627 depends on ARCH_THUNDER || (64BIT && COMPILE_TEST)
629 select GPIOLIB_IRQCHIP
630 select IRQ_DOMAIN_HIERARCHY
631 select IRQ_FASTEOI_HIERARCHY_HANDLERS
633 Say yes here to support the on-chip GPIO lines on the ThunderX
634 and OCTEON-TX families of SoCs.
637 tristate "UniPhier GPIO support"
638 depends on ARCH_UNIPHIER || COMPILE_TEST
640 select IRQ_DOMAIN_HIERARCHY
642 Say yes here to support UniPhier GPIOs.
646 depends on ARCH_MXC && SOC_VF610
647 select GPIOLIB_IRQCHIP
649 Say yes here to support Vybrid vf610 GPIOs.
652 tristate "Toshiba Visconti GPIO support"
653 depends on ARCH_VISCONTI || COMPILE_TEST
655 select GPIOLIB_IRQCHIP
657 select IRQ_DOMAIN_HIERARCHY
659 Say yes here to support GPIO on Tohisba Visconti.
662 tristate "NEC VR4100 series General-purpose I/O Uint support"
663 depends on CPU_VR41XX
665 Say yes here to support the NEC VR4100 series General-purpose I/O Uint
668 tristate "VIA VX855/VX875 GPIO"
669 depends on (X86 || COMPILE_TEST) && PCI
673 Support access to the VX855/VX875 GPIO lines through the gpio library.
675 This driver provides common support for accessing the device,
676 additional drivers must be enabled in order to use the
677 functionality of the device.
680 tristate "Qualcomm Technologies Inc WCD9340/WCD9341 gpio controller driver"
681 depends on MFD_WCD934X && OF_GPIO
683 This driver is to support GPIO block found on the Qualcomm Technologies
684 Inc WCD9340/WCD9341 Audio Codec.
687 bool "APM X-Gene GPIO controller support"
688 depends on ARM64 && OF_GPIO
690 This driver is to support the GPIO block within the APM X-Gene SoC
691 platform's generic flash controller. The GPIO pins are muxed with
692 the generic flash controller's address and data pins. Say yes
693 here to enable the GFC GPIO functionality.
696 tristate "APM X-Gene GPIO standby controller support"
697 depends on (ARCH_XGENE || COMPILE_TEST)
699 select GPIOLIB_IRQCHIP
700 select IRQ_DOMAIN_HIERARCHY
702 This driver supports the GPIO block within the APM X-Gene
703 Standby Domain. Say yes here to enable the GPIO functionality.
706 tristate "Xilinx GPIO support"
707 select GPIOLIB_IRQCHIP
710 Say yes here to support the Xilinx FPGA GPIO device
713 tristate "Netlogic XLP GPIO support"
714 depends on OF_GPIO && (CPU_XLP || ARCH_THUNDER2 || COMPILE_TEST)
715 select GPIOLIB_IRQCHIP
717 This driver provides support for GPIO interface on Netlogic XLP MIPS64
718 SoCs. Currently supported XLP variants are XLP8XX, XLP3XX, XLP2XX,
719 XLP9XX and XLP5XX. The same GPIO controller block is also present in
720 Cavium's ThunderX2 CN99XX SoCs.
725 bool "Xtensa GPIO32 support"
727 depends on HAVE_XTENSA_GPIO32
730 Say yes here to support the Xtensa internal GPIO32 IMPWIRE (input)
731 and EXPSTATE (output) ports
734 bool "LSI ZEVIO SoC memory mapped GPIOs"
735 depends on ARM && OF_GPIO
737 Say yes here to support the GPIO controller in LSI ZEVIO SoCs.
740 tristate "Xilinx Zynq GPIO support"
741 depends on ARCH_ZYNQ || ARCH_ZYNQMP
742 select GPIOLIB_IRQCHIP
744 Say yes here to support Xilinx Zynq GPIO controller.
746 config GPIO_LOONGSON1
747 tristate "Loongson1 GPIO support"
748 depends on MACH_LOONGSON32
751 Say Y or M here to support GPIO on Loongson1 SoCs.
754 tristate "GPIO support for AMD Fusion Controller Hub (G-series SOCs)"
756 This option enables driver for GPIO on AMDs Fusion Controller Hub,
757 as found on G-series SOCs (eg. GX-412TC)
759 Note: This driver doesn't registers itself automatically, as it
760 needs to be provided with platform specific configuration.
761 (See eg. CONFIG_PCENGINES_APU2.)
764 bool "MStar MSC313 GPIO support"
765 depends on ARCH_MSTARV7
767 select GPIOLIB_IRQCHIP
768 select IRQ_DOMAIN_HIERARCHY
770 Say Y here to support the main GPIO block on MStar/SigmaStar
775 menu "Port-mapped I/O GPIO drivers"
776 depends on X86 # Unconditional I/O space access
778 config GPIO_104_DIO_48E
779 tristate "ACCES 104-DIO-48E GPIO support"
782 select GPIOLIB_IRQCHIP
784 Enables GPIO support for the ACCES 104-DIO-48E series (104-DIO-48E,
785 104-DIO-24E). The base port addresses for the devices may be
786 configured via the base module parameter. The interrupt line numbers
787 for the devices may be configured via the irq module parameter.
789 config GPIO_104_IDIO_16
790 tristate "ACCES 104-IDIO-16 GPIO support"
793 select GPIOLIB_IRQCHIP
795 Enables GPIO support for the ACCES 104-IDIO-16 family (104-IDIO-16,
796 104-IDIO-16E, 104-IDO-16, 104-IDIO-8, 104-IDIO-8E, 104-IDO-8). The
797 base port addresses for the devices may be configured via the base
798 module parameter. The interrupt line numbers for the devices may be
799 configured via the irq module parameter.
801 config GPIO_104_IDI_48
802 tristate "ACCES 104-IDI-48 GPIO support"
805 select GPIOLIB_IRQCHIP
807 Enables GPIO support for the ACCES 104-IDI-48 family (104-IDI-48A,
808 104-IDI-48AC, 104-IDI-48B, 104-IDI-48BC). The base port addresses for
809 the devices may be configured via the base module parameter. The
810 interrupt line numbers for the devices may be configured via the irq
814 tristate "F71869, F71869A, F71882FG, F71889F and F81866 GPIO support"
816 This option enables support for GPIOs found on Fintek Super-I/O
817 chips F71869, F71869A, F71882FG, F71889F and F81866.
819 To compile this driver as a module, choose M here: the module will
820 be called f7188x-gpio.
823 tristate "Diamond Systems GPIO-MM GPIO support"
827 Enables GPIO support for the Diamond Systems GPIO-MM and GPIO-MM-12.
829 The Diamond Systems GPIO-MM device features 48 lines of digital I/O
830 via the emulation of dual 82C55A PPI chips. This driver provides GPIO
831 support for these 48 channels of digital I/O.
833 The base port addresses for the devices may be configured via the base
834 array module parameter.
837 tristate "IT87xx GPIO support"
839 Say yes here to support GPIO functionality of IT87xx Super I/O chips.
841 This driver is tested with ITE IT8728 and IT8732 Super I/O chips, and
842 supports the IT8761E, IT8613, IT8620E, and IT8628E Super I/O chips as
845 To compile this driver as a module, choose M here: the module will
849 tristate "Intel SCH/TunnelCreek/Centerton/Quark X1000 GPIO"
850 depends on (X86 || COMPILE_TEST) && PCI
854 Say yes here to support GPIO interface on Intel Poulsbo SCH,
855 Intel Tunnel Creek processor, Intel Centerton processor or
856 Intel Quark X1000 SoC.
858 The Intel SCH contains a total of 14 GPIO pins. Ten GPIOs are
859 powered by the core power rail and are turned off during sleep
860 modes (S3 and higher). The remaining four GPIOs are powered by
861 the Intel SCH suspend power supply. These GPIOs remain
862 active during S3. The suspend powered GPIOs can be used to wake the
863 system from the Suspend-to-RAM state.
865 The Intel Tunnel Creek processor has 5 GPIOs powered by the
866 core power rail and 9 from suspend power supply.
868 The Intel Centerton processor has a total of 30 GPIO pins.
869 Twenty-one are powered by the core power rail and 9 from the
870 suspend power supply.
872 The Intel Quark X1000 SoC has 2 GPIOs powered by the core
873 power well and 6 from the suspend power well.
876 tristate "SMSC SCH311x SuperI/O GPIO"
878 Driver to enable the GPIOs found on SMSC SMSC SCH3112, SCH3114 and
879 SCH3116 "Super I/O" chipsets.
881 To compile this driver as a module, choose M here: the module will
882 be called gpio-sch311x.
885 tristate "TS-5500 DIO blocks and compatibles"
886 depends on TS5500 || COMPILE_TEST
888 This driver supports Digital I/O exposed by pin blocks found on some
889 Technologic Systems platforms. It includes, but is not limited to, 3
890 blocks of the TS-5500: DIO1, DIO2 and the LCD port, and the TS-5600
894 tristate "Winbond Super I/O GPIO support"
897 This option enables support for GPIOs found on Winbond Super I/O
899 Currently, only W83627UHG (also known as Nuvoton NCT6627UD) is
902 You will need to provide a module parameter "gpios", or a
903 boot-time parameter "gpio_winbond.gpios" with a bitmask of GPIO
904 ports to enable (bit 0 is GPIO1, bit 1 is GPIO2, etc.).
906 To compile this driver as a module, choose M here: the module will
907 be called gpio-winbond.
910 tristate "WinSystems WS16C48 GPIO support"
912 select GPIOLIB_IRQCHIP
914 Enables GPIO support for the WinSystems WS16C48. The base port
915 addresses for the devices may be configured via the base module
916 parameter. The interrupt line numbers for the devices may be
917 configured via the irq module parameter.
921 menu "I2C GPIO expanders"
925 tristate "ADP5588 I2C GPIO expander"
927 This option enables support for 18 GPIOs found
928 on Analog Devices ADP5588 GPIO Expanders.
930 config GPIO_ADP5588_IRQ
931 bool "Interrupt controller support for ADP5588"
932 depends on GPIO_ADP5588=y
933 select GPIOLIB_IRQCHIP
935 Say yes here to enable the adp5588 to be used as an interrupt
936 controller. It requires the driver to be built in the kernel.
939 tristate "Avionic Design N-bit GPIO expander"
941 select GPIOLIB_IRQCHIP
943 This option enables support for N GPIOs found on Avionic Design
944 I2C GPIO expanders. The register space will be extended by powers
945 of two, so the controller will need to accommodate for that. For
946 example: if a controller provides 48 pins, 6 registers will be
947 enough to represent all pins, but the driver will assume a
948 register layout for 64 pins (8 registers).
951 tristate "Gateworks PLD GPIO Expander"
954 Say yes here to provide access to the Gateworks I2C PLD GPIO
955 Expander. This is used at least on the Cambria GW2358-4.
958 tristate "Maxim MAX7300 GPIO expander"
961 GPIO driver for Maxim MAX7300 I2C-based GPIO expander.
964 tristate "MAX7319, MAX7320-7327 I2C Port Expanders"
966 Say yes here to support the MAX7319, MAX7320-7327 series of I2C
967 Port Expanders. Each IO port on these chips has a fixed role of
968 Input (designated by 'I'), Push-Pull Output ('O'), or Open-Drain
969 Input and Output (designed by 'P'). The combinations are listed
972 8 bits: max7319 (8I), max7320 (8O), max7321 (8P),
973 max7322 (4I4O), max7323 (4P4O)
975 16 bits: max7324 (8I8O), max7325 (8P8O),
976 max7326 (4I12O), max7327 (4P12O)
978 Board setup code must specify the model to use, and the start
979 number for these GPIOs.
981 config GPIO_MAX732X_IRQ
982 bool "Interrupt controller support for MAX732x"
983 depends on GPIO_MAX732X=y
984 select GPIOLIB_IRQCHIP
986 Say yes here to enable the max732x to be used as an interrupt
987 controller. It requires the driver to be built in the kernel.
989 config GPIO_MC9S08DZ60
990 bool "MX35 3DS BOARD MC9S08DZ60 GPIO functions"
991 depends on I2C=y && MACH_MX35_3DS
993 Select this to enable the MC9S08DZ60 GPIO driver
996 tristate "PCA95[357]x, PCA9698, TCA64xx, and MAX7310 I/O ports"
999 Say yes here to provide access to several register-oriented
1000 SMBus I/O expanders, made mostly by NXP or TI. Compatible
1003 4 bits: pca9536, pca9537
1005 8 bits: max7310, max7315, pca6107, pca9534, pca9538, pca9554,
1006 pca9556, pca9557, pca9574, tca6408, tca9554, xra1202
1008 16 bits: max7312, max7313, pca9535, pca9539, pca9555, pca9575,
1013 40 bits: pca9505, pca9698
1015 config GPIO_PCA953X_IRQ
1016 bool "Interrupt controller support for PCA953x"
1017 depends on GPIO_PCA953X
1018 select GPIOLIB_IRQCHIP
1020 Say yes here to enable the pca953x to be used as an interrupt
1021 controller. It requires the driver to be built in the kernel.
1024 tristate "PCA9570 4-Bit I2C GPO expander"
1026 Say yes here to enable the GPO driver for the NXP PCA9570 chip.
1028 To compile this driver as a module, choose M here: the module will
1029 be called gpio-pca9570.
1032 tristate "PCF857x, PCA{85,96}7x, and MAX732[89] I2C GPIO expanders"
1033 select GPIOLIB_IRQCHIP
1036 Say yes here to provide access to most "quasi-bidirectional" I2C
1037 GPIO expanders used for additional digital outputs or inputs.
1038 Most of these parts are from NXP, though TI is a second source for
1039 some of them. Compatible models include:
1041 8 bits: pcf8574, pcf8574a, pca8574, pca8574a,
1042 pca9670, pca9672, pca9674, pca9674a,
1045 16 bits: pcf8575, pcf8575c, pca8575,
1046 pca9671, pca9673, pca9675
1048 Your board setup code will need to declare the expanders in
1049 use, and assign numbers to the GPIOs they expose. Those GPIOs
1050 can then be used from drivers and other kernel code, just like
1051 other GPIOs, but only accessible from task contexts.
1053 This driver provides an in-kernel interface to those GPIOs using
1054 platform-neutral GPIO calls.
1056 config GPIO_TPIC2810
1057 tristate "TPIC2810 8-Bit I2C GPO expander"
1059 Say yes here to enable the GPO driver for the TI TPIC2810 chip.
1061 To compile this driver as a module, choose M here: the module will
1062 be called gpio-tpic2810.
1065 tristate "Technologic Systems FPGA I2C GPIO"
1066 depends on SOC_IMX6 || COMPILE_TEST
1069 Say yes here to enabled the GPIO driver for Technologic's FPGA core.
1070 Series supported include TS-4100, TS-4900, TS-7970 and TS-7990.
1074 menu "MFD GPIO expanders"
1077 tristate "GPIO Support for ADP5520 PMIC"
1078 depends on PMIC_ADP5520
1080 This option enables support for on-chip GPIO found
1081 on Analog Devices ADP5520 PMICs.
1083 config GPIO_ALTERA_A10SR
1084 tristate "Altera Arria10 System Resource GPIO"
1085 depends on MFD_ALTERA_A10SR
1087 Driver for Arria10 Development Kit GPIO expansion which
1088 includes reads of pushbuttons and DIP switches as well
1092 tristate "Wolfson Microelectronics Arizona class devices"
1093 depends on MFD_ARIZONA
1095 Support for GPIOs on Wolfson Arizona class devices.
1098 tristate "ROHM BD70528 GPIO support"
1099 depends on MFD_ROHM_BD70528
1101 Support for GPIOs on ROHM BD70528 PMIC. There are four GPIOs
1102 available on the ROHM PMIC in total. The GPIOs can also
1103 generate interrupts.
1105 This driver can also be built as a module. If so, the module
1106 will be called gpio-bd70528.
1109 tristate "ROHM BD71828 GPIO support"
1110 depends on MFD_ROHM_BD71828
1112 Support for GPIOs on ROHM BD71828 PMIC. There are three GPIOs
1113 available on the ROHM PMIC in total. The GPIOs are limited to
1114 outputs only and pins must be configured to GPIO outputs by
1115 OTP. Enable this only if you want to use these pins as outputs.
1117 This driver can also be built as a module. If so, the module
1118 will be called gpio-bd71828.
1120 config GPIO_BD9571MWV
1121 tristate "ROHM BD9571 GPIO support"
1122 depends on MFD_BD9571MWV
1124 Support for GPIOs on ROHM BD9571 PMIC. There are two GPIOs
1125 available on the ROHM PMIC in total, both of which can also
1126 generate interrupts.
1128 This driver can also be built as a module. If so, the module
1129 will be called gpio-bd9571mwv.
1131 config GPIO_CRYSTAL_COVE
1132 tristate "GPIO support for Crystal Cove PMIC"
1133 depends on (X86 || COMPILE_TEST) && INTEL_SOC_PMIC
1134 select GPIOLIB_IRQCHIP
1136 Support for GPIO pins on Crystal Cove PMIC.
1138 Say Yes if you have a Intel SoC based tablet with Crystal Cove PMIC
1141 This driver can also be built as a module. If so, the module will be
1142 called gpio-crystalcove.
1145 tristate "AMD CS5535/CS5536 GPIO support"
1146 depends on X86 || MIPS || COMPILE_TEST
1147 depends on MFD_CS5535
1149 The AMD CS5535 and CS5536 southbridges support 28 GPIO pins that
1150 can be used for quite a number of things. The CS5535/6 is found on
1151 AMD Geode and Lemote Yeeloong devices.
1156 tristate "Dialog DA9052 GPIO"
1157 depends on PMIC_DA9052
1159 Say yes here to enable the GPIO driver for the DA9052 chip.
1162 tristate "Dialog Semiconductor DA9055 GPIO"
1163 depends on MFD_DA9055
1165 Say yes here to enable the GPIO driver for the DA9055 chip.
1167 The Dialog DA9055 PMIC chip has 3 GPIO pins that can be
1168 be controller by this driver.
1170 If driver is built as a module it will be called gpio-da9055.
1173 tristate "Diolan DLN2 GPIO support"
1175 select GPIOLIB_IRQCHIP
1178 Select this option to enable GPIO driver for the Diolan DLN2
1181 This driver can also be built as a module. If so, the module
1182 will be called gpio-dln2.
1185 bool "HTC EGPIO support"
1188 This driver supports the CPLD egpio chip present on
1189 several HTC phones. It provides basic support for input
1190 pins, output pins, and irqs.
1192 config GPIO_JANZ_TTL
1193 tristate "Janz VMOD-TTL Digital IO Module"
1194 depends on MFD_JANZ_CMODIO
1196 This enables support for the Janz VMOD-TTL Digital IO module.
1197 This driver provides support for driving the pins in output
1198 mode only. Input mode is not supported.
1201 tristate "Kontron ETX / COMexpress GPIO"
1202 depends on MFD_KEMPLD
1204 This enables support for the PLD GPIO interface on some Kontron ETX
1205 and COMexpress (ETXexpress) modules.
1207 This driver can also be built as a module. If so, the module will be
1211 tristate "TI/National Semiconductor LP3943 GPIO expander"
1212 depends on MFD_LP3943
1214 GPIO driver for LP3943 MFD.
1215 LP3943 can be used as a GPIO expander which provides up to 16 GPIOs.
1216 Open drain outputs are required for this usage.
1219 tristate "TI LP873X GPO"
1220 depends on MFD_TI_LP873X
1222 This driver supports the GPO on TI Lp873x PMICs. 2 GPOs are present
1225 This driver can also be built as a module. If so, the module will be
1229 tristate "TI LP87565 GPIO"
1230 depends on MFD_TI_LP87565
1232 This driver supports the GPIO on TI Lp873565 PMICs. 3 GPIOs are present
1235 This driver can also be built as a module. If so, the module will be
1236 called gpio-lp87565.
1239 tristate "Cirrus Logic Madera class codecs"
1240 depends on PINCTRL_MADERA
1242 Support for GPIOs on Cirrus Logic Madera class codecs.
1244 config GPIO_MAX77620
1245 tristate "GPIO support for PMIC MAX77620 and MAX20024"
1246 depends on MFD_MAX77620
1247 select GPIOLIB_IRQCHIP
1249 GPIO driver for MAX77620 and MAX20024 PMIC from Maxim Semiconductor.
1250 MAX77620 PMIC has 8 pins that can be configured as GPIOs. The
1251 driver also provides interrupt support for each of the gpios.
1252 Say yes here to enable the max77620 to be used as gpio controller.
1254 config GPIO_MAX77650
1255 tristate "Maxim MAX77650/77651 GPIO support"
1256 depends on MFD_MAX77650
1258 GPIO driver for MAX77650/77651 PMIC from Maxim Semiconductor.
1259 These chips have a single pin that can be configured as GPIO.
1262 bool "TI PALMAS series PMICs GPIO"
1263 depends on MFD_PALMAS
1265 Select this option to enable GPIO driver for the TI PALMAS
1269 bool "RICOH RC5T583 GPIO"
1270 depends on MFD_RC5T583
1272 Select this option to enable GPIO driver for the Ricoh RC5T583
1274 This driver provides the support for driving/reading the gpio pins
1275 of RC5T583 device through standard gpio library.
1277 config GPIO_SL28CPLD
1278 tristate "Kontron sl28cpld GPIO support"
1279 depends on MFD_SL28CPLD || COMPILE_TEST
1281 select GPIOLIB_IRQCHIP
1284 This enables support for the GPIOs found on the Kontron sl28 CPLD.
1286 This driver can also be built as a module. If so, the module will be
1287 called gpio-sl28cpld.
1291 depends on MFD_STMPE
1293 select GPIOLIB_IRQCHIP
1295 This enables support for the GPIOs found on the STMPE I/O
1299 bool "TC3589X GPIOs"
1300 depends on MFD_TC3589X
1302 select GPIOLIB_IRQCHIP
1304 This enables support for the GPIOs found on the TC3589X
1307 config GPIO_TIMBERDALE
1308 bool "Support for timberdale GPIO IP"
1309 depends on MFD_TIMBERDALE
1311 Add support for the GPIO IP in the timberdale FPGA.
1313 config GPIO_TPS65086
1314 tristate "TI TPS65086 GPO"
1315 depends on MFD_TPS65086
1317 This driver supports the GPO on TI TPS65086x PMICs.
1319 config GPIO_TPS65218
1320 tristate "TPS65218 GPIO"
1321 depends on MFD_TPS65218
1323 Select this option to enable GPIO driver for the TPS65218
1326 config GPIO_TPS6586X
1327 bool "TPS6586X GPIO"
1328 depends on MFD_TPS6586X
1330 Select this option to enable GPIO driver for the TPS6586X
1333 config GPIO_TPS65910
1334 bool "TPS65910 GPIO"
1335 depends on MFD_TPS65910
1337 Select this option to enable GPIO driver for the TPS65910
1340 config GPIO_TPS65912
1341 tristate "TI TPS65912 GPIO"
1342 depends on MFD_TPS65912
1344 This driver supports TPS65912 gpio chip
1346 config GPIO_TPS68470
1347 bool "TPS68470 GPIO"
1348 depends on MFD_TPS68470
1350 Select this option to enable GPIO driver for the TPS68470
1352 There are 7 GPIOs and few sensor related GPIOs supported
1353 by the TPS68470. While the 7 GPIOs can be configured as
1354 input or output as appropriate, the sensor related GPIOs
1355 are "output only" GPIOs.
1357 This driver config is bool, as the GPIO functionality
1358 of the TPS68470 must be available before dependent
1362 tristate "TQ-Systems QTMX86 GPIO"
1363 depends on MFD_TQMX86 || COMPILE_TEST
1364 select GPIOLIB_IRQCHIP
1366 This driver supports GPIO on the TQMX86 IO controller.
1369 tristate "TWL4030, TWL5030, and TPS659x0 GPIOs"
1370 depends on TWL4030_CORE
1372 Say yes here to access the GPIO signals of various multi-function
1373 power management chips from Texas Instruments.
1376 tristate "TWL6040 GPO"
1377 depends on TWL6040_CORE
1379 Say yes here to access the GPO signals of twl6040
1380 audio chip from Texas Instruments.
1383 tristate "Philips UCB1400 GPIO"
1384 depends on UCB1400_CORE
1386 This enables support for the Philips UCB1400 GPIO pins.
1387 The UCB1400 is an AC97 audio codec.
1389 config GPIO_WHISKEY_COVE
1390 tristate "GPIO support for Whiskey Cove PMIC"
1391 depends on (X86 || COMPILE_TEST) && INTEL_SOC_PMIC_BXTWC
1392 select GPIOLIB_IRQCHIP
1394 Support for GPIO pins on Whiskey Cove PMIC.
1396 Say Yes if you have a Intel SoC based tablet with Whiskey Cove PMIC
1399 This driver can also be built as a module. If so, the module will be
1403 tristate "WM831x GPIOs"
1404 depends on MFD_WM831X
1406 Say yes here to access the GPIO signals of WM831x power management
1407 chips from Wolfson Microelectronics.
1410 tristate "WM8350 GPIOs"
1411 depends on MFD_WM8350
1413 Say yes here to access the GPIO signals of WM8350 power management
1414 chips from Wolfson Microelectronics.
1417 tristate "WM8994 GPIOs"
1418 depends on MFD_WM8994
1420 Say yes here to access the GPIO signals of WM8994 audio hub
1421 CODECs from Wolfson Microelectronics.
1425 menu "PCI GPIO expanders"
1429 tristate "AMD 8111 GPIO driver"
1430 depends on X86 || COMPILE_TEST
1432 The AMD 8111 south bridge contains 32 GPIO pins which can be used.
1434 Note, that usually system firmware/ACPI handles GPIO pins on their
1435 own and users might easily break their systems with uncarefull usage
1441 tristate "BT8XX GPIO abuser"
1442 depends on VIDEO_BT848=n
1444 The BT8xx frame grabber chip has 24 GPIO pins that can be abused
1445 as a cheap PCI GPIO card.
1447 This chip can be found on Miro, Hauppauge and STB TV-cards.
1449 The card needs to be physically altered for using it as a
1450 GPIO card. For more information on how to build a GPIO card
1451 from a BT8xx TV card, see the documentation file at
1452 Documentation/driver-api/gpio/bt8xxgpio.rst
1456 config GPIO_MERRIFIELD
1457 tristate "Intel Merrifield GPIO support"
1458 depends on X86_INTEL_MID
1459 select GPIOLIB_IRQCHIP
1461 Say Y here to support Intel Merrifield GPIO.
1464 tristate "Mellanox BlueField SoC GPIO"
1465 depends on (MELLANOX_PLATFORM && ARM64 && ACPI) || (64BIT && COMPILE_TEST)
1468 Say Y here if you want GPIO support on Mellanox BlueField SoC.
1471 tristate "Mellanox BlueField 2 SoC GPIO"
1472 depends on (MELLANOX_PLATFORM && ARM64 && ACPI) || (64BIT && COMPILE_TEST)
1475 Say Y here if you want GPIO support on Mellanox BlueField 2 SoC.
1478 tristate "OKI SEMICONDUCTOR ML7213 IOH GPIO support"
1479 depends on X86 || COMPILE_TEST
1480 select GENERIC_IRQ_CHIP
1482 ML7213 is companion chip for Intel Atom E6xx series.
1483 This driver can be used for OKI SEMICONDUCTOR ML7213 IOH(Input/Output
1484 Hub) which is for IVI(In-Vehicle Infotainment) use.
1485 This driver can access the IOH's GPIO device.
1488 tristate "Intel EG20T PCH/LAPIS Semiconductor IOH(ML7223/ML7831) GPIO"
1489 depends on X86_32 || MIPS || COMPILE_TEST
1490 select GENERIC_IRQ_CHIP
1492 This driver is for PCH(Platform controller Hub) GPIO of Intel Topcliff
1493 which is an IOH(Input/Output Hub) for x86 embedded processor.
1494 This driver can access PCH GPIO device.
1496 This driver also can be used for LAPIS Semiconductor IOH(Input/
1497 Output Hub), ML7223 and ML7831.
1498 ML7223 IOH is for MP(Media Phone) use.
1499 ML7831 IOH is for general purpose use.
1500 ML7223/ML7831 is companion chip for Intel Atom E6xx series.
1501 ML7223/ML7831 is completely compatible for Intel EG20T PCH.
1503 config GPIO_PCI_IDIO_16
1504 tristate "ACCES PCI-IDIO-16 GPIO support"
1505 select GPIOLIB_IRQCHIP
1507 Enables GPIO support for the ACCES PCI-IDIO-16. An interrupt is
1508 generated when any of the inputs change state (low to high or high to
1509 low). Input filter control is not supported by this driver, and the
1510 input filters are deactivated by this driver.
1512 config GPIO_PCIE_IDIO_24
1513 tristate "ACCES PCIe-IDIO-24 GPIO support"
1514 select GPIOLIB_IRQCHIP
1516 Enables GPIO support for the ACCES PCIe-IDIO-24 family (PCIe-IDIO-24,
1517 PCIe-IDI-24, PCIe-IDO-24, PCIe-IDIO-12). An interrupt is generated
1518 when any of the inputs change state (low to high or high to low).
1519 Input filter control is not supported by this driver, and the input
1520 filters are deactivated by this driver.
1523 tristate "RDC R-321x GPIO support"
1527 Support for the RDC R321x SoC GPIOs over southbridge
1528 PCI configuration space.
1530 config GPIO_SODAVILLE
1531 bool "Intel Sodaville GPIO support"
1532 depends on X86 && OF
1534 select GENERIC_IRQ_CHIP
1536 Say Y here to support Intel Sodaville GPIO.
1540 menu "SPI GPIO expanders"
1541 depends on SPI_MASTER
1544 tristate "74x164 serial-in/parallel-out 8-bits shift register"
1547 Driver for 74x164 compatible serial-in/parallel-out 8-outputs
1548 shift registers. This driver can be used to provide access
1549 to more gpio outputs.
1551 config GPIO_MAX3191X
1552 tristate "Maxim MAX3191x industrial serializer"
1555 GPIO driver for Maxim MAX31910, MAX31911, MAX31912, MAX31913,
1556 MAX31953 and MAX31963 industrial serializer, a daisy-chainable
1557 chip to make 8 digital 24V inputs available via SPI. Supports
1558 CRC checksums to guard against electromagnetic interference,
1559 as well as undervoltage and overtemperature detection.
1562 tristate "Maxim MAX7301 GPIO expander"
1565 GPIO driver for Maxim MAX7301 SPI-based GPIO expander.
1568 tristate "Freescale MC33880 high-side/low-side switch"
1570 SPI driver for Freescale MC33880 high-side/low-side switch.
1571 This provides GPIO interface supporting inputs and outputs.
1574 tristate "Generic parallel-in/serial-out shift register"
1576 GPIO driver for SPI compatible parallel-in/serial-out shift
1577 registers. These are input only devices.
1580 tristate "EXAR XRA1403 16-bit GPIO expander"
1583 GPIO driver for EXAR XRA1403 16-bit SPI-based GPIO expander.
1586 tristate "Turris Mox Moxtet bus GPIO expander"
1589 Say yes here if you are building for the Turris Mox router.
1590 This is the driver needed for configuring the GPIOs via the Moxtet
1591 bus. For example the Mox module with SFP cage needs this driver
1592 so that phylink can use corresponding GPIOs.
1596 menu "USB GPIO expanders"
1599 config GPIO_VIPERBOARD
1600 tristate "Viperboard GPIO a & b support"
1601 depends on MFD_VIPERBOARD
1603 Say yes here to access the GPIO signals of Nano River
1604 Technologies Viperboard. There are two GPIO chips on the
1605 board: gpioa and gpiob.
1606 See viperboard API specification and Nano
1607 River Tech's viperboard.h for detailed meaning
1608 of the module parameters.
1612 menu "Virtual GPIO drivers"
1614 config GPIO_AGGREGATOR
1615 tristate "GPIO Aggregator"
1617 Say yes here to enable the GPIO Aggregator, which provides a way to
1618 aggregate existing GPIO lines into a new virtual GPIO chip.
1619 This can serve the following purposes:
1620 - Assign permissions for a collection of GPIO lines to a user,
1621 - Export a collection of GPIO lines to a virtual machine,
1622 - Provide a generic driver for a GPIO-operated device in an
1623 industrial control context, to be operated from userspace using
1624 the GPIO chardev interface.
1627 tristate "GPIO Testing Driver"
1630 This enables GPIO Testing driver, which provides a way to test GPIO
1631 subsystem through sysfs (or char device) and debugfs.
1632 User could use it through the script in
1633 tools/testing/selftests/gpio/gpio-mockup.sh. Reference the usage in