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
445 depends on ARCH_MXS || COMPILE_TEST
447 select GENERIC_IRQ_CHIP
450 tristate "Cavium OCTEON GPIO"
451 depends on CAVIUM_OCTEON_SOC
454 Say yes here to support the on-chip GPIO lines on the OCTEON
458 tristate "TI OMAP GPIO support" if ARCH_OMAP2PLUS || COMPILE_TEST
459 default y if ARCH_OMAP
461 select GENERIC_IRQ_CHIP
462 select GPIOLIB_IRQCHIP
464 Say yes here to enable GPIO support for TI OMAP SoCs.
467 tristate "PrimeCell PL061 GPIO support"
470 select GPIOLIB_IRQCHIP
472 Say yes here to support the PrimeCell PL061 GPIO device
474 config GPIO_PMIC_EIC_SPRD
475 tristate "Spreadtrum PMIC EIC support"
476 depends on MFD_SC27XX_PMIC || COMPILE_TEST
478 select GPIOLIB_IRQCHIP
480 Say yes here to support Spreadtrum PMIC EIC device.
483 bool "PXA GPIO support"
484 depends on ARCH_PXA || ARCH_MMP || COMPILE_TEST
486 Say yes here to support the PXA GPIO device
489 tristate "Renesas R-Car GPIO"
490 depends on ARCH_RENESAS || COMPILE_TEST
491 select GPIOLIB_IRQCHIP
493 Say yes here to support GPIO on Renesas R-Car SoCs.
496 bool "RDA Micro GPIO controller support"
497 depends on ARCH_RDA || COMPILE_TEST
500 select GPIOLIB_IRQCHIP
502 Say Y here to support RDA Micro GPIO controller.
507 A 32-bit single register GPIO fixed in/out implementation. This
508 can be used to represent any register as a set of GPIO signals.
510 config GPIO_SAMA5D2_PIOBU
511 tristate "SAMA5D2 PIOBU GPIO support"
512 depends on MFD_SYSCON
516 Say yes here to use the PIOBU pins as GPIOs.
518 PIOBU pins on the SAMA5D2 can be used as GPIOs.
519 The difference from regular GPIOs is that they
520 maintain their value during backup/self-refresh.
523 bool "SiFive GPIO support"
524 depends on OF_GPIO && IRQ_DOMAIN_HIERARCHY
526 select GPIOLIB_IRQCHIP
529 Say yes here to support the GPIO device on SiFive SoCs.
532 tristate "SIOX GPIO support"
534 select GPIOLIB_IRQCHIP
536 Say yes here to support SIOX I/O devices. These are units connected
537 via a SIOX bus and have a number of fixed-direction I/O lines.
539 config GPIO_SNPS_CREG
540 bool "Synopsys GPIO via CREG (Control REGisters) driver"
541 depends on ARC || COMPILE_TEST
544 This driver supports GPIOs via CREG on various Synopsys SoCs.
545 This is a single-register MMIO GPIO driver for complex cases
546 where only several fields in register belong to GPIO lines and
547 each GPIO line owns a field with different length and on/off value.
549 config GPIO_SPEAR_SPICS
550 bool "ST SPEAr13xx SPI Chip Select as GPIO support"
551 depends on PLAT_SPEAR
552 select GENERIC_IRQ_CHIP
554 Say yes here to support ST SPEAr SPI Chip Select as GPIO device
557 tristate "Spreadtrum GPIO support"
558 depends on ARCH_SPRD || COMPILE_TEST
560 select GPIOLIB_IRQCHIP
562 Say yes here to support Spreadtrum GPIO device.
565 bool "STA2x11/ConneXt GPIO support"
566 depends on MFD_STA2X11
567 select GENERIC_IRQ_CHIP
569 Say yes here to support the STA2x11/ConneXt GPIO device.
570 The GPIO module has 128 GPIO pins with alternate functions.
573 bool "XWAY STP GPIOs"
574 depends on SOC_XWAY || COMPILE_TEST
577 This enables support for the Serial To Parallel (STP) unit found on
578 XWAY SoC. The STP allows the SoC to drive a shift registers cascade,
579 that can be up to 24 bit. This peripheral is aimed at driving leds.
580 Some of the gpios/leds can be auto updated by the soc with dsl and
584 tristate "GPIO based on SYSCON"
585 depends on MFD_SYSCON && OF
587 Say yes here to support GPIO functionality though SYSCON driver.
592 select GENERIC_IRQ_CHIP
596 bool "NVIDIA Tegra GPIO support"
598 depends on ARCH_TEGRA || COMPILE_TEST
601 Say yes here to support GPIO pins on NVIDIA Tegra SoCs.
604 tristate "NVIDIA Tegra186 GPIO support"
605 default ARCH_TEGRA_186_SOC || ARCH_TEGRA_194_SOC
606 depends on ARCH_TEGRA_186_SOC || ARCH_TEGRA_194_SOC || COMPILE_TEST
608 select GPIOLIB_IRQCHIP
609 select IRQ_DOMAIN_HIERARCHY
611 Say yes here to support GPIO pins on NVIDIA Tegra186 SoCs.
614 tristate "TS-4800 DIO blocks and compatibles"
616 depends on SOC_IMX51 || COMPILE_TEST
619 This driver support TS-4800 FPGA GPIO controllers.
622 tristate "Cavium ThunderX/OCTEON-TX GPIO"
623 depends on ARCH_THUNDER || (64BIT && COMPILE_TEST)
625 select GPIOLIB_IRQCHIP
626 select IRQ_DOMAIN_HIERARCHY
627 select IRQ_FASTEOI_HIERARCHY_HANDLERS
629 Say yes here to support the on-chip GPIO lines on the ThunderX
630 and OCTEON-TX families of SoCs.
633 tristate "UniPhier GPIO support"
634 depends on ARCH_UNIPHIER || COMPILE_TEST
636 select IRQ_DOMAIN_HIERARCHY
638 Say yes here to support UniPhier GPIOs.
642 depends on ARCH_MXC && SOC_VF610
643 select GPIOLIB_IRQCHIP
645 Say yes here to support Vybrid vf610 GPIOs.
648 tristate "NEC VR4100 series General-purpose I/O Uint support"
649 depends on CPU_VR41XX
651 Say yes here to support the NEC VR4100 series General-purpose I/O Uint
654 tristate "VIA VX855/VX875 GPIO"
655 depends on (X86 || COMPILE_TEST) && PCI
659 Support access to the VX855/VX875 GPIO lines through the gpio library.
661 This driver provides common support for accessing the device,
662 additional drivers must be enabled in order to use the
663 functionality of the device.
666 tristate "Qualcomm Technologies Inc WCD9340/WCD9341 gpio controller driver"
667 depends on MFD_WCD934X && OF_GPIO
669 This driver is to supprot GPIO block found on the Qualcomm Technologies
670 Inc WCD9340/WCD9341 Audio Codec.
673 bool "APM X-Gene GPIO controller support"
674 depends on ARM64 && OF_GPIO
676 This driver is to support the GPIO block within the APM X-Gene SoC
677 platform's generic flash controller. The GPIO pins are muxed with
678 the generic flash controller's address and data pins. Say yes
679 here to enable the GFC GPIO functionality.
682 tristate "APM X-Gene GPIO standby controller support"
683 depends on (ARCH_XGENE || COMPILE_TEST)
685 select GPIOLIB_IRQCHIP
686 select IRQ_DOMAIN_HIERARCHY
688 This driver supports the GPIO block within the APM X-Gene
689 Standby Domain. Say yes here to enable the GPIO functionality.
692 tristate "Xilinx GPIO support"
694 Say yes here to support the Xilinx FPGA GPIO device
697 tristate "Netlogic XLP GPIO support"
698 depends on OF_GPIO && (CPU_XLP || ARCH_THUNDER2 || COMPILE_TEST)
699 select GPIOLIB_IRQCHIP
701 This driver provides support for GPIO interface on Netlogic XLP MIPS64
702 SoCs. Currently supported XLP variants are XLP8XX, XLP3XX, XLP2XX,
703 XLP9XX and XLP5XX. The same GPIO controller block is also present in
704 Cavium's ThunderX2 CN99XX SoCs.
709 bool "Xtensa GPIO32 support"
711 depends on HAVE_XTENSA_GPIO32
714 Say yes here to support the Xtensa internal GPIO32 IMPWIRE (input)
715 and EXPSTATE (output) ports
718 bool "LSI ZEVIO SoC memory mapped GPIOs"
719 depends on ARM && OF_GPIO
721 Say yes here to support the GPIO controller in LSI ZEVIO SoCs.
724 tristate "Xilinx Zynq GPIO support"
725 depends on ARCH_ZYNQ || ARCH_ZYNQMP
726 select GPIOLIB_IRQCHIP
728 Say yes here to support Xilinx Zynq GPIO controller.
731 bool "ZTE ZX GPIO support"
732 depends on ARCH_ZX || COMPILE_TEST
733 select GPIOLIB_IRQCHIP
735 Say yes here to support the GPIO device on ZTE ZX SoCs.
737 config GPIO_LOONGSON1
738 tristate "Loongson1 GPIO support"
739 depends on MACH_LOONGSON32
742 Say Y or M here to support GPIO on Loongson1 SoCs.
745 tristate "GPIO support for AMD Fusion Controller Hub (G-series SOCs)"
747 This option enables driver for GPIO on AMDs Fusion Controller Hub,
748 as found on G-series SOCs (eg. GX-412TC)
750 Note: This driver doesn't registers itself automatically, as it
751 needs to be provided with platform specific configuration.
752 (See eg. CONFIG_PCENGINES_APU2.)
755 bool "MStar MSC313 GPIO support"
756 depends on ARCH_MSTARV7
758 select GPIOLIB_IRQCHIP
759 select IRQ_DOMAIN_HIERARCHY
761 Say Y here to support the main GPIO block on MStar/SigmaStar
766 menu "Port-mapped I/O GPIO drivers"
767 depends on X86 # Unconditional I/O space access
769 config GPIO_104_DIO_48E
770 tristate "ACCES 104-DIO-48E GPIO support"
773 select GPIOLIB_IRQCHIP
775 Enables GPIO support for the ACCES 104-DIO-48E series (104-DIO-48E,
776 104-DIO-24E). The base port addresses for the devices may be
777 configured via the base module parameter. The interrupt line numbers
778 for the devices may be configured via the irq module parameter.
780 config GPIO_104_IDIO_16
781 tristate "ACCES 104-IDIO-16 GPIO support"
784 select GPIOLIB_IRQCHIP
786 Enables GPIO support for the ACCES 104-IDIO-16 family (104-IDIO-16,
787 104-IDIO-16E, 104-IDO-16, 104-IDIO-8, 104-IDIO-8E, 104-IDO-8). The
788 base port addresses for the devices may be configured via the base
789 module parameter. The interrupt line numbers for the devices may be
790 configured via the irq module parameter.
792 config GPIO_104_IDI_48
793 tristate "ACCES 104-IDI-48 GPIO support"
796 select GPIOLIB_IRQCHIP
798 Enables GPIO support for the ACCES 104-IDI-48 family (104-IDI-48A,
799 104-IDI-48AC, 104-IDI-48B, 104-IDI-48BC). The base port addresses for
800 the devices may be configured via the base module parameter. The
801 interrupt line numbers for the devices may be configured via the irq
805 tristate "F71869, F71869A, F71882FG, F71889F and F81866 GPIO support"
807 This option enables support for GPIOs found on Fintek Super-I/O
808 chips F71869, F71869A, F71882FG, F71889F and F81866.
810 To compile this driver as a module, choose M here: the module will
811 be called f7188x-gpio.
814 tristate "Diamond Systems GPIO-MM GPIO support"
818 Enables GPIO support for the Diamond Systems GPIO-MM and GPIO-MM-12.
820 The Diamond Systems GPIO-MM device features 48 lines of digital I/O
821 via the emulation of dual 82C55A PPI chips. This driver provides GPIO
822 support for these 48 channels of digital I/O.
824 The base port addresses for the devices may be configured via the base
825 array module parameter.
828 tristate "IT87xx GPIO support"
830 Say yes here to support GPIO functionality of IT87xx Super I/O chips.
832 This driver is tested with ITE IT8728 and IT8732 Super I/O chips, and
833 supports the IT8761E, IT8613, IT8620E, and IT8628E Super I/O chips as
836 To compile this driver as a module, choose M here: the module will
840 tristate "Intel SCH/TunnelCreek/Centerton/Quark X1000 GPIO"
841 depends on (X86 || COMPILE_TEST) && PCI
845 Say yes here to support GPIO interface on Intel Poulsbo SCH,
846 Intel Tunnel Creek processor, Intel Centerton processor or
847 Intel Quark X1000 SoC.
849 The Intel SCH contains a total of 14 GPIO pins. Ten GPIOs are
850 powered by the core power rail and are turned off during sleep
851 modes (S3 and higher). The remaining four GPIOs are powered by
852 the Intel SCH suspend power supply. These GPIOs remain
853 active during S3. The suspend powered GPIOs can be used to wake the
854 system from the Suspend-to-RAM state.
856 The Intel Tunnel Creek processor has 5 GPIOs powered by the
857 core power rail and 9 from suspend power supply.
859 The Intel Centerton processor has a total of 30 GPIO pins.
860 Twenty-one are powered by the core power rail and 9 from the
861 suspend power supply.
863 The Intel Quark X1000 SoC has 2 GPIOs powered by the core
864 power well and 6 from the suspend power well.
867 tristate "SMSC SCH311x SuperI/O GPIO"
869 Driver to enable the GPIOs found on SMSC SMSC SCH3112, SCH3114 and
870 SCH3116 "Super I/O" chipsets.
872 To compile this driver as a module, choose M here: the module will
873 be called gpio-sch311x.
876 tristate "TS-5500 DIO blocks and compatibles"
877 depends on TS5500 || COMPILE_TEST
879 This driver supports Digital I/O exposed by pin blocks found on some
880 Technologic Systems platforms. It includes, but is not limited to, 3
881 blocks of the TS-5500: DIO1, DIO2 and the LCD port, and the TS-5600
885 tristate "Winbond Super I/O GPIO support"
888 This option enables support for GPIOs found on Winbond Super I/O
890 Currently, only W83627UHG (also known as Nuvoton NCT6627UD) is
893 You will need to provide a module parameter "gpios", or a
894 boot-time parameter "gpio_winbond.gpios" with a bitmask of GPIO
895 ports to enable (bit 0 is GPIO1, bit 1 is GPIO2, etc.).
897 To compile this driver as a module, choose M here: the module will
898 be called gpio-winbond.
901 tristate "WinSystems WS16C48 GPIO support"
903 select GPIOLIB_IRQCHIP
905 Enables GPIO support for the WinSystems WS16C48. The base port
906 addresses for the devices may be configured via the base module
907 parameter. The interrupt line numbers for the devices may be
908 configured via the irq module parameter.
912 menu "I2C GPIO expanders"
916 tristate "ADP5588 I2C GPIO expander"
918 This option enables support for 18 GPIOs found
919 on Analog Devices ADP5588 GPIO Expanders.
921 config GPIO_ADP5588_IRQ
922 bool "Interrupt controller support for ADP5588"
923 depends on GPIO_ADP5588=y
924 select GPIOLIB_IRQCHIP
926 Say yes here to enable the adp5588 to be used as an interrupt
927 controller. It requires the driver to be built in the kernel.
930 tristate "Avionic Design N-bit GPIO expander"
932 select GPIOLIB_IRQCHIP
934 This option enables support for N GPIOs found on Avionic Design
935 I2C GPIO expanders. The register space will be extended by powers
936 of two, so the controller will need to accommodate for that. For
937 example: if a controller provides 48 pins, 6 registers will be
938 enough to represent all pins, but the driver will assume a
939 register layout for 64 pins (8 registers).
942 tristate "Gateworks PLD GPIO Expander"
945 Say yes here to provide access to the Gateworks I2C PLD GPIO
946 Expander. This is used at least on the Cambria GW2358-4.
949 tristate "Maxim MAX7300 GPIO expander"
952 GPIO driver for Maxim MAX7300 I2C-based GPIO expander.
955 tristate "MAX7319, MAX7320-7327 I2C Port Expanders"
957 Say yes here to support the MAX7319, MAX7320-7327 series of I2C
958 Port Expanders. Each IO port on these chips has a fixed role of
959 Input (designated by 'I'), Push-Pull Output ('O'), or Open-Drain
960 Input and Output (designed by 'P'). The combinations are listed
963 8 bits: max7319 (8I), max7320 (8O), max7321 (8P),
964 max7322 (4I4O), max7323 (4P4O)
966 16 bits: max7324 (8I8O), max7325 (8P8O),
967 max7326 (4I12O), max7327 (4P12O)
969 Board setup code must specify the model to use, and the start
970 number for these GPIOs.
972 config GPIO_MAX732X_IRQ
973 bool "Interrupt controller support for MAX732x"
974 depends on GPIO_MAX732X=y
975 select GPIOLIB_IRQCHIP
977 Say yes here to enable the max732x to be used as an interrupt
978 controller. It requires the driver to be built in the kernel.
980 config GPIO_MC9S08DZ60
981 bool "MX35 3DS BOARD MC9S08DZ60 GPIO functions"
982 depends on I2C=y && MACH_MX35_3DS
984 Select this to enable the MC9S08DZ60 GPIO driver
987 tristate "PCA95[357]x, PCA9698, TCA64xx, and MAX7310 I/O ports"
990 Say yes here to provide access to several register-oriented
991 SMBus I/O expanders, made mostly by NXP or TI. Compatible
994 4 bits: pca9536, pca9537
996 8 bits: max7310, max7315, pca6107, pca9534, pca9538, pca9554,
997 pca9556, pca9557, pca9574, tca6408, tca9554, xra1202
999 16 bits: max7312, max7313, pca9535, pca9539, pca9555, pca9575,
1004 40 bits: pca9505, pca9698
1006 config GPIO_PCA953X_IRQ
1007 bool "Interrupt controller support for PCA953x"
1008 depends on GPIO_PCA953X
1009 select GPIOLIB_IRQCHIP
1011 Say yes here to enable the pca953x to be used as an interrupt
1012 controller. It requires the driver to be built in the kernel.
1015 tristate "PCA9570 4-Bit I2C GPO expander"
1017 Say yes here to enable the GPO driver for the NXP PCA9570 chip.
1019 To compile this driver as a module, choose M here: the module will
1020 be called gpio-pca9570.
1023 tristate "PCF857x, PCA{85,96}7x, and MAX732[89] I2C GPIO expanders"
1024 select GPIOLIB_IRQCHIP
1027 Say yes here to provide access to most "quasi-bidirectional" I2C
1028 GPIO expanders used for additional digital outputs or inputs.
1029 Most of these parts are from NXP, though TI is a second source for
1030 some of them. Compatible models include:
1032 8 bits: pcf8574, pcf8574a, pca8574, pca8574a,
1033 pca9670, pca9672, pca9674, pca9674a,
1036 16 bits: pcf8575, pcf8575c, pca8575,
1037 pca9671, pca9673, pca9675
1039 Your board setup code will need to declare the expanders in
1040 use, and assign numbers to the GPIOs they expose. Those GPIOs
1041 can then be used from drivers and other kernel code, just like
1042 other GPIOs, but only accessible from task contexts.
1044 This driver provides an in-kernel interface to those GPIOs using
1045 platform-neutral GPIO calls.
1047 config GPIO_TPIC2810
1048 tristate "TPIC2810 8-Bit I2C GPO expander"
1050 Say yes here to enable the GPO driver for the TI TPIC2810 chip.
1052 To compile this driver as a module, choose M here: the module will
1053 be called gpio-tpic2810.
1056 tristate "Technologic Systems FPGA I2C GPIO"
1057 depends on SOC_IMX6 || COMPILE_TEST
1060 Say yes here to enabled the GPIO driver for Technologic's FPGA core.
1061 Series supported include TS-4100, TS-4900, TS-7970 and TS-7990.
1065 menu "MFD GPIO expanders"
1068 tristate "GPIO Support for ADP5520 PMIC"
1069 depends on PMIC_ADP5520
1071 This option enables support for on-chip GPIO found
1072 on Analog Devices ADP5520 PMICs.
1074 config GPIO_ALTERA_A10SR
1075 tristate "Altera Arria10 System Resource GPIO"
1076 depends on MFD_ALTERA_A10SR
1078 Driver for Arria10 Development Kit GPIO expansion which
1079 includes reads of pushbuttons and DIP switches as well
1083 tristate "Wolfson Microelectronics Arizona class devices"
1084 depends on MFD_ARIZONA
1086 Support for GPIOs on Wolfson Arizona class devices.
1089 tristate "ROHM BD70528 GPIO support"
1090 depends on MFD_ROHM_BD70528
1092 Support for GPIOs on ROHM BD70528 PMIC. There are four GPIOs
1093 available on the ROHM PMIC in total. The GPIOs can also
1094 generate interrupts.
1096 This driver can also be built as a module. If so, the module
1097 will be called gpio-bd70528.
1100 tristate "ROHM BD71828 GPIO support"
1101 depends on MFD_ROHM_BD71828
1103 Support for GPIOs on ROHM BD71828 PMIC. There are three GPIOs
1104 available on the ROHM PMIC in total. The GPIOs are limited to
1105 outputs only and pins must be configured to GPIO outputs by
1106 OTP. Enable this only if you want to use these pins as outputs.
1108 This driver can also be built as a module. If so, the module
1109 will be called gpio-bd71828.
1111 config GPIO_BD9571MWV
1112 tristate "ROHM BD9571 GPIO support"
1113 depends on MFD_BD9571MWV
1115 Support for GPIOs on ROHM BD9571 PMIC. There are two GPIOs
1116 available on the ROHM PMIC in total, both of which can also
1117 generate interrupts.
1119 This driver can also be built as a module. If so, the module
1120 will be called gpio-bd9571mwv.
1122 config GPIO_CRYSTAL_COVE
1123 tristate "GPIO support for Crystal Cove PMIC"
1124 depends on (X86 || COMPILE_TEST) && INTEL_SOC_PMIC
1125 select GPIOLIB_IRQCHIP
1127 Support for GPIO pins on Crystal Cove PMIC.
1129 Say Yes if you have a Intel SoC based tablet with Crystal Cove PMIC
1132 This driver can also be built as a module. If so, the module will be
1133 called gpio-crystalcove.
1136 tristate "AMD CS5535/CS5536 GPIO support"
1137 depends on X86 || MIPS || COMPILE_TEST
1138 depends on MFD_CS5535
1140 The AMD CS5535 and CS5536 southbridges support 28 GPIO pins that
1141 can be used for quite a number of things. The CS5535/6 is found on
1142 AMD Geode and Lemote Yeeloong devices.
1147 tristate "Dialog DA9052 GPIO"
1148 depends on PMIC_DA9052
1150 Say yes here to enable the GPIO driver for the DA9052 chip.
1153 tristate "Dialog Semiconductor DA9055 GPIO"
1154 depends on MFD_DA9055
1156 Say yes here to enable the GPIO driver for the DA9055 chip.
1158 The Dialog DA9055 PMIC chip has 3 GPIO pins that can be
1159 be controller by this driver.
1161 If driver is built as a module it will be called gpio-da9055.
1164 tristate "Diolan DLN2 GPIO support"
1166 select GPIOLIB_IRQCHIP
1169 Select this option to enable GPIO driver for the Diolan DLN2
1172 This driver can also be built as a module. If so, the module
1173 will be called gpio-dln2.
1176 bool "HTC EGPIO support"
1179 This driver supports the CPLD egpio chip present on
1180 several HTC phones. It provides basic support for input
1181 pins, output pins, and irqs.
1183 config GPIO_JANZ_TTL
1184 tristate "Janz VMOD-TTL Digital IO Module"
1185 depends on MFD_JANZ_CMODIO
1187 This enables support for the Janz VMOD-TTL Digital IO module.
1188 This driver provides support for driving the pins in output
1189 mode only. Input mode is not supported.
1192 tristate "Kontron ETX / COMexpress GPIO"
1193 depends on MFD_KEMPLD
1195 This enables support for the PLD GPIO interface on some Kontron ETX
1196 and COMexpress (ETXexpress) modules.
1198 This driver can also be built as a module. If so, the module will be
1202 tristate "TI/National Semiconductor LP3943 GPIO expander"
1203 depends on MFD_LP3943
1205 GPIO driver for LP3943 MFD.
1206 LP3943 can be used as a GPIO expander which provides up to 16 GPIOs.
1207 Open drain outputs are required for this usage.
1210 tristate "TI LP873X GPO"
1211 depends on MFD_TI_LP873X
1213 This driver supports the GPO on TI Lp873x PMICs. 2 GPOs are present
1216 This driver can also be built as a module. If so, the module will be
1220 tristate "TI LP87565 GPIO"
1221 depends on MFD_TI_LP87565
1223 This driver supports the GPIO on TI Lp873565 PMICs. 3 GPIOs are present
1226 This driver can also be built as a module. If so, the module will be
1227 called gpio-lp87565.
1230 tristate "Cirrus Logic Madera class codecs"
1231 depends on PINCTRL_MADERA
1233 Support for GPIOs on Cirrus Logic Madera class codecs.
1235 config GPIO_MAX77620
1236 tristate "GPIO support for PMIC MAX77620 and MAX20024"
1237 depends on MFD_MAX77620
1238 select GPIOLIB_IRQCHIP
1240 GPIO driver for MAX77620 and MAX20024 PMIC from Maxim Semiconductor.
1241 MAX77620 PMIC has 8 pins that can be configured as GPIOs. The
1242 driver also provides interrupt support for each of the gpios.
1243 Say yes here to enable the max77620 to be used as gpio controller.
1245 config GPIO_MAX77650
1246 tristate "Maxim MAX77650/77651 GPIO support"
1247 depends on MFD_MAX77650
1249 GPIO driver for MAX77650/77651 PMIC from Maxim Semiconductor.
1250 These chips have a single pin that can be configured as GPIO.
1253 bool "Intel MSIC mixed signal gpio support"
1254 depends on (X86 || COMPILE_TEST) && MFD_INTEL_MSIC
1256 Enable support for GPIO on intel MSIC controllers found in
1260 bool "TI PALMAS series PMICs GPIO"
1261 depends on MFD_PALMAS
1263 Select this option to enable GPIO driver for the TI PALMAS
1267 bool "RICOH RC5T583 GPIO"
1268 depends on MFD_RC5T583
1270 Select this option to enable GPIO driver for the Ricoh RC5T583
1272 This driver provides the support for driving/reading the gpio pins
1273 of RC5T583 device through standard gpio library.
1275 config GPIO_SL28CPLD
1276 tristate "Kontron sl28cpld GPIO support"
1277 depends on MFD_SL28CPLD || COMPILE_TEST
1279 select GPIOLIB_IRQCHIP
1282 This enables support for the GPIOs found on the Kontron sl28 CPLD.
1284 This driver can also be built as a module. If so, the module will be
1285 called gpio-sl28cpld.
1289 depends on MFD_STMPE
1291 select GPIOLIB_IRQCHIP
1293 This enables support for the GPIOs found on the STMPE I/O
1297 bool "TC3589X GPIOs"
1298 depends on MFD_TC3589X
1300 select GPIOLIB_IRQCHIP
1302 This enables support for the GPIOs found on the TC3589X
1305 config GPIO_TIMBERDALE
1306 bool "Support for timberdale GPIO IP"
1307 depends on MFD_TIMBERDALE
1309 Add support for the GPIO IP in the timberdale FPGA.
1311 config GPIO_TPS65086
1312 tristate "TI TPS65086 GPO"
1313 depends on MFD_TPS65086
1315 This driver supports the GPO on TI TPS65086x PMICs.
1317 config GPIO_TPS65218
1318 tristate "TPS65218 GPIO"
1319 depends on MFD_TPS65218
1321 Select this option to enable GPIO driver for the TPS65218
1324 config GPIO_TPS6586X
1325 bool "TPS6586X GPIO"
1326 depends on MFD_TPS6586X
1328 Select this option to enable GPIO driver for the TPS6586X
1331 config GPIO_TPS65910
1332 bool "TPS65910 GPIO"
1333 depends on MFD_TPS65910
1335 Select this option to enable GPIO driver for the TPS65910
1338 config GPIO_TPS65912
1339 tristate "TI TPS65912 GPIO"
1340 depends on MFD_TPS65912
1342 This driver supports TPS65912 gpio chip
1344 config GPIO_TPS68470
1345 bool "TPS68470 GPIO"
1346 depends on MFD_TPS68470
1348 Select this option to enable GPIO driver for the TPS68470
1350 There are 7 GPIOs and few sensor related GPIOs supported
1351 by the TPS68470. While the 7 GPIOs can be configured as
1352 input or output as appropriate, the sensor related GPIOs
1353 are "output only" GPIOs.
1355 This driver config is bool, as the GPIO functionality
1356 of the TPS68470 must be available before dependent
1360 tristate "TQ-Systems QTMX86 GPIO"
1361 depends on MFD_TQMX86 || COMPILE_TEST
1362 select GPIOLIB_IRQCHIP
1364 This driver supports GPIO on the TQMX86 IO controller.
1367 tristate "TWL4030, TWL5030, and TPS659x0 GPIOs"
1368 depends on TWL4030_CORE
1370 Say yes here to access the GPIO signals of various multi-function
1371 power management chips from Texas Instruments.
1374 tristate "TWL6040 GPO"
1375 depends on TWL6040_CORE
1377 Say yes here to access the GPO signals of twl6040
1378 audio chip from Texas Instruments.
1381 tristate "Philips UCB1400 GPIO"
1382 depends on UCB1400_CORE
1384 This enables support for the Philips UCB1400 GPIO pins.
1385 The UCB1400 is an AC97 audio codec.
1387 config GPIO_WHISKEY_COVE
1388 tristate "GPIO support for Whiskey Cove PMIC"
1389 depends on (X86 || COMPILE_TEST) && INTEL_SOC_PMIC_BXTWC
1390 select GPIOLIB_IRQCHIP
1392 Support for GPIO pins on Whiskey Cove PMIC.
1394 Say Yes if you have a Intel SoC based tablet with Whiskey Cove PMIC
1397 This driver can also be built as a module. If so, the module will be
1401 tristate "WM831x GPIOs"
1402 depends on MFD_WM831X
1404 Say yes here to access the GPIO signals of WM831x power management
1405 chips from Wolfson Microelectronics.
1408 tristate "WM8350 GPIOs"
1409 depends on MFD_WM8350
1411 Say yes here to access the GPIO signals of WM8350 power management
1412 chips from Wolfson Microelectronics.
1415 tristate "WM8994 GPIOs"
1416 depends on MFD_WM8994
1418 Say yes here to access the GPIO signals of WM8994 audio hub
1419 CODECs from Wolfson Microelectronics.
1423 menu "PCI GPIO expanders"
1427 tristate "AMD 8111 GPIO driver"
1428 depends on X86 || COMPILE_TEST
1430 The AMD 8111 south bridge contains 32 GPIO pins which can be used.
1432 Note, that usually system firmware/ACPI handles GPIO pins on their
1433 own and users might easily break their systems with uncarefull usage
1439 tristate "BT8XX GPIO abuser"
1440 depends on VIDEO_BT848=n
1442 The BT8xx frame grabber chip has 24 GPIO pins that can be abused
1443 as a cheap PCI GPIO card.
1445 This chip can be found on Miro, Hauppauge and STB TV-cards.
1447 The card needs to be physically altered for using it as a
1448 GPIO card. For more information on how to build a GPIO card
1449 from a BT8xx TV card, see the documentation file at
1450 Documentation/driver-api/gpio/bt8xxgpio.rst
1454 config GPIO_INTEL_MID
1455 bool "Intel MID GPIO support"
1456 depends on X86_INTEL_MID
1457 select GPIOLIB_IRQCHIP
1459 Say Y here to support Intel MID GPIO.
1461 config GPIO_MERRIFIELD
1462 tristate "Intel Merrifield GPIO support"
1463 depends on X86_INTEL_MID
1464 select GPIOLIB_IRQCHIP
1466 Say Y here to support Intel Merrifield GPIO.
1469 tristate "Mellanox BlueField SoC GPIO"
1470 depends on (MELLANOX_PLATFORM && ARM64 && ACPI) || (64BIT && COMPILE_TEST)
1473 Say Y here if you want GPIO support on Mellanox BlueField SoC.
1476 tristate "Mellanox BlueField 2 SoC GPIO"
1477 depends on (MELLANOX_PLATFORM && ARM64 && ACPI) || (64BIT && COMPILE_TEST)
1480 Say Y here if you want GPIO support on Mellanox BlueField 2 SoC.
1483 tristate "OKI SEMICONDUCTOR ML7213 IOH GPIO support"
1484 depends on X86 || COMPILE_TEST
1485 select GENERIC_IRQ_CHIP
1487 ML7213 is companion chip for Intel Atom E6xx series.
1488 This driver can be used for OKI SEMICONDUCTOR ML7213 IOH(Input/Output
1489 Hub) which is for IVI(In-Vehicle Infotainment) use.
1490 This driver can access the IOH's GPIO device.
1493 tristate "Intel EG20T PCH/LAPIS Semiconductor IOH(ML7223/ML7831) GPIO"
1494 depends on X86_32 || MIPS || COMPILE_TEST
1495 select GENERIC_IRQ_CHIP
1497 This driver is for PCH(Platform controller Hub) GPIO of Intel Topcliff
1498 which is an IOH(Input/Output Hub) for x86 embedded processor.
1499 This driver can access PCH GPIO device.
1501 This driver also can be used for LAPIS Semiconductor IOH(Input/
1502 Output Hub), ML7223 and ML7831.
1503 ML7223 IOH is for MP(Media Phone) use.
1504 ML7831 IOH is for general purpose use.
1505 ML7223/ML7831 is companion chip for Intel Atom E6xx series.
1506 ML7223/ML7831 is completely compatible for Intel EG20T PCH.
1508 config GPIO_PCI_IDIO_16
1509 tristate "ACCES PCI-IDIO-16 GPIO support"
1510 select GPIOLIB_IRQCHIP
1512 Enables GPIO support for the ACCES PCI-IDIO-16. An interrupt is
1513 generated when any of the inputs change state (low to high or high to
1514 low). Input filter control is not supported by this driver, and the
1515 input filters are deactivated by this driver.
1517 config GPIO_PCIE_IDIO_24
1518 tristate "ACCES PCIe-IDIO-24 GPIO support"
1519 select GPIOLIB_IRQCHIP
1521 Enables GPIO support for the ACCES PCIe-IDIO-24 family (PCIe-IDIO-24,
1522 PCIe-IDI-24, PCIe-IDO-24, PCIe-IDIO-12). An interrupt is generated
1523 when any of the inputs change state (low to high or high to low).
1524 Input filter control is not supported by this driver, and the input
1525 filters are deactivated by this driver.
1528 tristate "RDC R-321x GPIO support"
1532 Support for the RDC R321x SoC GPIOs over southbridge
1533 PCI configuration space.
1535 config GPIO_SODAVILLE
1536 bool "Intel Sodaville GPIO support"
1537 depends on X86 && OF
1539 select GENERIC_IRQ_CHIP
1541 Say Y here to support Intel Sodaville GPIO.
1545 menu "SPI GPIO expanders"
1546 depends on SPI_MASTER
1549 tristate "74x164 serial-in/parallel-out 8-bits shift register"
1552 Driver for 74x164 compatible serial-in/parallel-out 8-outputs
1553 shift registers. This driver can be used to provide access
1554 to more gpio outputs.
1556 config GPIO_MAX3191X
1557 tristate "Maxim MAX3191x industrial serializer"
1560 GPIO driver for Maxim MAX31910, MAX31911, MAX31912, MAX31913,
1561 MAX31953 and MAX31963 industrial serializer, a daisy-chainable
1562 chip to make 8 digital 24V inputs available via SPI. Supports
1563 CRC checksums to guard against electromagnetic interference,
1564 as well as undervoltage and overtemperature detection.
1567 tristate "Maxim MAX7301 GPIO expander"
1570 GPIO driver for Maxim MAX7301 SPI-based GPIO expander.
1573 tristate "Freescale MC33880 high-side/low-side switch"
1575 SPI driver for Freescale MC33880 high-side/low-side switch.
1576 This provides GPIO interface supporting inputs and outputs.
1579 tristate "Generic parallel-in/serial-out shift register"
1581 GPIO driver for SPI compatible parallel-in/serial-out shift
1582 registers. These are input only devices.
1585 tristate "EXAR XRA1403 16-bit GPIO expander"
1588 GPIO driver for EXAR XRA1403 16-bit SPI-based GPIO expander.
1591 tristate "Turris Mox Moxtet bus GPIO expander"
1594 Say yes here if you are building for the Turris Mox router.
1595 This is the driver needed for configuring the GPIOs via the Moxtet
1596 bus. For example the Mox module with SFP cage needs this driver
1597 so that phylink can use corresponding GPIOs.
1601 menu "USB GPIO expanders"
1604 config GPIO_VIPERBOARD
1605 tristate "Viperboard GPIO a & b support"
1606 depends on MFD_VIPERBOARD
1608 Say yes here to access the GPIO signals of Nano River
1609 Technologies Viperboard. There are two GPIO chips on the
1610 board: gpioa and gpiob.
1611 See viperboard API specification and Nano
1612 River Tech's viperboard.h for detailed meaning
1613 of the module parameters.
1617 menu "Virtual GPIO drivers"
1619 config GPIO_AGGREGATOR
1620 tristate "GPIO Aggregator"
1622 Say yes here to enable the GPIO Aggregator, which provides a way to
1623 aggregate existing GPIO lines into a new virtual GPIO chip.
1624 This can serve the following purposes:
1625 - Assign permissions for a collection of GPIO lines to a user,
1626 - Export a collection of GPIO lines to a virtual machine,
1627 - Provide a generic driver for a GPIO-operated device in an
1628 industrial control context, to be operated from userspace using
1629 the GPIO chardev interface.
1632 tristate "GPIO Testing Driver"
1635 This enables GPIO Testing driver, which provides a way to test GPIO
1636 subsystem through sysfs(or char device) and debugfs. GPIO_SYSFS
1637 must be selected for this test.
1638 User could use it through the script in
1639 tools/testing/selftests/gpio/gpio-mockup.sh. Reference the usage in