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
260 Selecting this option will enable handling of GPIO pins present
261 on Exar XR17V352/354/358 chips.
264 bool "GE FPGA based GPIO"
268 Support for common GPIO functionality provided on some GE Single Board
271 This driver provides basic support (configure as input or output, read
272 and write pin state) for GPIO implemented in a number of GE single
275 config GPIO_FTGPIO010
276 bool "Faraday FTGPIO010 GPIO"
279 select GPIOLIB_IRQCHIP
280 default (ARCH_GEMINI || ARCH_MOXART)
282 Support for common GPIOs from the Faraday FTGPIO010 IP core, found in
283 Cortina systems Gemini platforms, Moxa ART and others.
285 config GPIO_GENERIC_PLATFORM
286 tristate "Generic memory-mapped GPIO controller support (MMIO platform device)"
289 Say yes here to support basic platform_device memory-mapped GPIO controllers.
292 tristate "Aeroflex Gaisler GRGPIO support"
297 Select this to support Aeroflex Gaisler GRGPIO cores from the GRLIB
298 VHDL IP core library.
301 tristate "Nintendo Wii (Hollywood) GPIO"
304 select GPIOLIB_IRQCHIP
306 Select this to support the GPIO controller of the Nintendo Wii.
311 tristate "Intel ICH GPIO"
312 depends on PCI && X86
316 Say yes here to support the GPIO functionality of a number of Intel
317 ICH-based chipsets. Currently supported devices: ICH6, ICH7, ICH8
318 ICH9, ICH10, Series 5/3400 (eg Ibex Peak), Series 6/C200 (eg
319 Cougar Point), NM10 (Tiger Point), and 3100 (Whitmore Lake).
324 tristate "Intel IOP GPIO"
325 depends on ARCH_IOP32X || COMPILE_TEST
328 Say yes here to support the GPIO functionality of a number of Intel
334 bool "Intel IXP4xx GPIO"
335 depends on ARM # For <asm/mach-types.h>
336 depends on ARCH_IXP4XX
338 select GPIOLIB_IRQCHIP
339 select IRQ_DOMAIN_HIERARCHY
341 Say yes here to support the GPIO functionality of a number of Intel
342 IXP4xx series of chips.
346 tristate "Xylon LogiCVC GPIO support"
347 depends on MFD_SYSCON && OF
349 Say yes here to support GPIO functionality of the Xylon LogiCVC
350 programmable logic block.
353 bool "Loongson-2/3 GPIO support"
354 depends on CPU_LOONGSON2EF || CPU_LOONGSON64
356 driver for GPIO functionality on Loongson-2F/3A/3B processors.
359 tristate "NXP LPC18XX/43XX GPIO support"
360 default y if ARCH_LPC18XX
361 depends on OF_GPIO && (ARCH_LPC18XX || COMPILE_TEST)
362 select IRQ_DOMAIN_HIERARCHY
364 Select this option to enable GPIO driver for
365 NXP LPC18XX/43XX devices.
368 tristate "NXP LPC32XX GPIO support"
369 depends on OF_GPIO && (ARCH_LPC32XX || COMPILE_TEST)
371 Select this option to enable GPIO driver for
375 tristate "GPIO support for Fujitsu MB86S7x Platforms"
377 Say yes here to support the GPIO controller in Fujitsu MB86S70 SoCs.
380 tristate "MEN 16Z127 GPIO support"
384 Say yes here to support the MEN 16Z127 GPIO Controller
386 config GPIO_MM_LANTIQ
387 bool "Lantiq Memory mapped GPIOs"
388 depends on LANTIQ && SOC_XWAY
390 This enables support for memory mapped GPIOs on the External Bus Unit
391 (EBU) found on Lantiq SoCs. The gpios are output only as they are
392 created by attaching a 16bit latch to the bus.
396 depends on PPC_MPC52xx
399 bool "MPC512x/MPC8xxx/QorIQ GPIO support"
400 depends on PPC_MPC512x || PPC_MPC831x || PPC_MPC834x || PPC_MPC837x || \
401 FSL_SOC_BOOKE || PPC_86xx || ARCH_LAYERSCAPE || ARM || \
406 Say Y here if you're going to use hardware that connects to the
407 MPC512x/831x/834x/837x/8572/8610/QorIQ GPIOs.
410 bool "Mediatek MT7621 GPIO Support"
411 depends on SOC_MT7620 || SOC_MT7621 || COMPILE_TEST
414 select GPIOLIB_IRQCHIP
416 Say yes here to support the Mediatek MT7621 SoC GPIO device
420 depends on PLAT_ORION || ARCH_MVEBU
422 select GENERIC_IRQ_CHIP
426 tristate "i.MX GPIO support"
427 depends on ARCH_MXC || COMPILE_TEST
429 select GENERIC_IRQ_CHIP
433 depends on ARCH_MXS || COMPILE_TEST
435 select GENERIC_IRQ_CHIP
438 tristate "Cavium OCTEON GPIO"
439 depends on CAVIUM_OCTEON_SOC
442 Say yes here to support the on-chip GPIO lines on the OCTEON
446 tristate "TI OMAP GPIO support" if ARCH_OMAP2PLUS || COMPILE_TEST
447 default y if ARCH_OMAP
449 select GENERIC_IRQ_CHIP
450 select GPIOLIB_IRQCHIP
452 Say yes here to enable GPIO support for TI OMAP SoCs.
455 tristate "PrimeCell PL061 GPIO support"
458 select GPIOLIB_IRQCHIP
460 Say yes here to support the PrimeCell PL061 GPIO device
462 config GPIO_PMIC_EIC_SPRD
463 tristate "Spreadtrum PMIC EIC support"
464 depends on MFD_SC27XX_PMIC || COMPILE_TEST
466 select GPIOLIB_IRQCHIP
468 Say yes here to support Spreadtrum PMIC EIC device.
471 bool "PXA GPIO support"
472 depends on ARCH_PXA || ARCH_MMP || COMPILE_TEST
474 Say yes here to support the PXA GPIO device
477 tristate "Renesas R-Car GPIO"
478 depends on ARCH_RENESAS || COMPILE_TEST
479 select GPIOLIB_IRQCHIP
481 Say yes here to support GPIO on Renesas R-Car SoCs.
484 bool "RDA Micro GPIO controller support"
485 depends on ARCH_RDA || COMPILE_TEST
488 select GPIOLIB_IRQCHIP
490 Say Y here to support RDA Micro GPIO controller.
495 A 32-bit single register GPIO fixed in/out implementation. This
496 can be used to represent any register as a set of GPIO signals.
498 config GPIO_SAMA5D2_PIOBU
499 tristate "SAMA5D2 PIOBU GPIO support"
500 depends on MFD_SYSCON
504 Say yes here to use the PIOBU pins as GPIOs.
506 PIOBU pins on the SAMA5D2 can be used as GPIOs.
507 The difference from regular GPIOs is that they
508 maintain their value during backup/self-refresh.
511 bool "SiFive GPIO support"
512 depends on OF_GPIO && IRQ_DOMAIN_HIERARCHY
514 select GPIOLIB_IRQCHIP
517 Say yes here to support the GPIO device on SiFive SoCs.
520 tristate "SIOX GPIO support"
522 select GPIOLIB_IRQCHIP
524 Say yes here to support SIOX I/O devices. These are units connected
525 via a SIOX bus and have a number of fixed-direction I/O lines.
527 config GPIO_SNPS_CREG
528 bool "Synopsys GPIO via CREG (Control REGisters) driver"
529 depends on ARC || COMPILE_TEST
532 This driver supports GPIOs via CREG on various Synopsys SoCs.
533 This is a single-register MMIO GPIO driver for complex cases
534 where only several fields in register belong to GPIO lines and
535 each GPIO line owns a field with different length and on/off value.
537 config GPIO_SPEAR_SPICS
538 bool "ST SPEAr13xx SPI Chip Select as GPIO support"
539 depends on PLAT_SPEAR
540 select GENERIC_IRQ_CHIP
542 Say yes here to support ST SPEAr SPI Chip Select as GPIO device
545 tristate "Spreadtrum GPIO support"
546 depends on ARCH_SPRD || COMPILE_TEST
548 select GPIOLIB_IRQCHIP
550 Say yes here to support Spreadtrum GPIO device.
553 bool "STA2x11/ConneXt GPIO support"
554 depends on MFD_STA2X11
555 select GENERIC_IRQ_CHIP
557 Say yes here to support the STA2x11/ConneXt GPIO device.
558 The GPIO module has 128 GPIO pins with alternate functions.
561 bool "XWAY STP GPIOs"
562 depends on SOC_XWAY || COMPILE_TEST
565 This enables support for the Serial To Parallel (STP) unit found on
566 XWAY SoC. The STP allows the SoC to drive a shift registers cascade,
567 that can be up to 24 bit. This peripheral is aimed at driving leds.
568 Some of the gpios/leds can be auto updated by the soc with dsl and
572 tristate "GPIO based on SYSCON"
573 depends on MFD_SYSCON && OF
575 Say yes here to support GPIO functionality though SYSCON driver.
580 select GENERIC_IRQ_CHIP
584 bool "NVIDIA Tegra GPIO support"
586 depends on ARCH_TEGRA || COMPILE_TEST
589 Say yes here to support GPIO pins on NVIDIA Tegra SoCs.
592 tristate "NVIDIA Tegra186 GPIO support"
593 default ARCH_TEGRA_186_SOC || ARCH_TEGRA_194_SOC
594 depends on ARCH_TEGRA_186_SOC || ARCH_TEGRA_194_SOC || COMPILE_TEST
596 select GPIOLIB_IRQCHIP
597 select IRQ_DOMAIN_HIERARCHY
599 Say yes here to support GPIO pins on NVIDIA Tegra186 SoCs.
602 tristate "TS-4800 DIO blocks and compatibles"
604 depends on SOC_IMX51 || COMPILE_TEST
607 This driver support TS-4800 FPGA GPIO controllers.
610 tristate "Cavium ThunderX/OCTEON-TX GPIO"
611 depends on ARCH_THUNDER || (64BIT && COMPILE_TEST)
613 select GPIOLIB_IRQCHIP
614 select IRQ_DOMAIN_HIERARCHY
615 select IRQ_FASTEOI_HIERARCHY_HANDLERS
617 Say yes here to support the on-chip GPIO lines on the ThunderX
618 and OCTEON-TX families of SoCs.
621 tristate "UniPhier GPIO support"
622 depends on ARCH_UNIPHIER || COMPILE_TEST
624 select IRQ_DOMAIN_HIERARCHY
626 Say yes here to support UniPhier GPIOs.
630 depends on ARCH_MXC && SOC_VF610
631 select GPIOLIB_IRQCHIP
633 Say yes here to support Vybrid vf610 GPIOs.
636 tristate "NEC VR4100 series General-purpose I/O Uint support"
637 depends on CPU_VR41XX
639 Say yes here to support the NEC VR4100 series General-purpose I/O Uint
642 tristate "VIA VX855/VX875 GPIO"
643 depends on (X86 || COMPILE_TEST) && PCI
647 Support access to the VX855/VX875 GPIO lines through the gpio library.
649 This driver provides common support for accessing the device,
650 additional drivers must be enabled in order to use the
651 functionality of the device.
654 tristate "Qualcomm Technologies Inc WCD9340/WCD9341 gpio controller driver"
655 depends on MFD_WCD934X && OF_GPIO
657 This driver is to supprot GPIO block found on the Qualcomm Technologies
658 Inc WCD9340/WCD9341 Audio Codec.
661 bool "APM X-Gene GPIO controller support"
662 depends on ARM64 && OF_GPIO
664 This driver is to support the GPIO block within the APM X-Gene SoC
665 platform's generic flash controller. The GPIO pins are muxed with
666 the generic flash controller's address and data pins. Say yes
667 here to enable the GFC GPIO functionality.
670 tristate "APM X-Gene GPIO standby controller support"
671 depends on (ARCH_XGENE || COMPILE_TEST)
673 select GPIOLIB_IRQCHIP
674 select IRQ_DOMAIN_HIERARCHY
676 This driver supports the GPIO block within the APM X-Gene
677 Standby Domain. Say yes here to enable the GPIO functionality.
680 tristate "Xilinx GPIO support"
682 Say yes here to support the Xilinx FPGA GPIO device
685 tristate "Netlogic XLP GPIO support"
686 depends on OF_GPIO && (CPU_XLP || ARCH_THUNDER2 || COMPILE_TEST)
687 select GPIOLIB_IRQCHIP
689 This driver provides support for GPIO interface on Netlogic XLP MIPS64
690 SoCs. Currently supported XLP variants are XLP8XX, XLP3XX, XLP2XX,
691 XLP9XX and XLP5XX. The same GPIO controller block is also present in
692 Cavium's ThunderX2 CN99XX SoCs.
697 bool "Xtensa GPIO32 support"
699 depends on HAVE_XTENSA_GPIO32
702 Say yes here to support the Xtensa internal GPIO32 IMPWIRE (input)
703 and EXPSTATE (output) ports
706 bool "LSI ZEVIO SoC memory mapped GPIOs"
707 depends on ARM && OF_GPIO
709 Say yes here to support the GPIO controller in LSI ZEVIO SoCs.
712 tristate "Xilinx Zynq GPIO support"
713 depends on ARCH_ZYNQ || ARCH_ZYNQMP
714 select GPIOLIB_IRQCHIP
716 Say yes here to support Xilinx Zynq GPIO controller.
719 bool "ZTE ZX GPIO support"
720 depends on ARCH_ZX || COMPILE_TEST
721 select GPIOLIB_IRQCHIP
723 Say yes here to support the GPIO device on ZTE ZX SoCs.
725 config GPIO_LOONGSON1
726 tristate "Loongson1 GPIO support"
727 depends on MACH_LOONGSON32
730 Say Y or M here to support GPIO on Loongson1 SoCs.
733 tristate "GPIO support for AMD Fusion Controller Hub (G-series SOCs)"
735 This option enables driver for GPIO on AMDs Fusion Controller Hub,
736 as found on G-series SOCs (eg. GX-412TC)
738 Note: This driver doesn't registers itself automatically, as it
739 needs to be provided with platform specific configuration.
740 (See eg. CONFIG_PCENGINES_APU2.)
743 bool "MStar MSC313 GPIO support"
744 depends on ARCH_MSTARV7
746 select GPIOLIB_IRQCHIP
747 select IRQ_DOMAIN_HIERARCHY
749 Say Y here to support the main GPIO block on MStar/SigmaStar
754 menu "Port-mapped I/O GPIO drivers"
755 depends on X86 # Unconditional I/O space access
757 config GPIO_104_DIO_48E
758 tristate "ACCES 104-DIO-48E GPIO support"
761 select GPIOLIB_IRQCHIP
763 Enables GPIO support for the ACCES 104-DIO-48E series (104-DIO-48E,
764 104-DIO-24E). The base port addresses for the devices may be
765 configured via the base module parameter. The interrupt line numbers
766 for the devices may be configured via the irq module parameter.
768 config GPIO_104_IDIO_16
769 tristate "ACCES 104-IDIO-16 GPIO support"
772 select GPIOLIB_IRQCHIP
774 Enables GPIO support for the ACCES 104-IDIO-16 family (104-IDIO-16,
775 104-IDIO-16E, 104-IDO-16, 104-IDIO-8, 104-IDIO-8E, 104-IDO-8). The
776 base port addresses for the devices may be configured via the base
777 module parameter. The interrupt line numbers for the devices may be
778 configured via the irq module parameter.
780 config GPIO_104_IDI_48
781 tristate "ACCES 104-IDI-48 GPIO support"
784 select GPIOLIB_IRQCHIP
786 Enables GPIO support for the ACCES 104-IDI-48 family (104-IDI-48A,
787 104-IDI-48AC, 104-IDI-48B, 104-IDI-48BC). The base port addresses for
788 the devices may be configured via the base module parameter. The
789 interrupt line numbers for the devices may be configured via the irq
793 tristate "F71869, F71869A, F71882FG, F71889F and F81866 GPIO support"
795 This option enables support for GPIOs found on Fintek Super-I/O
796 chips F71869, F71869A, F71882FG, F71889F and F81866.
798 To compile this driver as a module, choose M here: the module will
799 be called f7188x-gpio.
802 tristate "Diamond Systems GPIO-MM GPIO support"
806 Enables GPIO support for the Diamond Systems GPIO-MM and GPIO-MM-12.
808 The Diamond Systems GPIO-MM device features 48 lines of digital I/O
809 via the emulation of dual 82C55A PPI chips. This driver provides GPIO
810 support for these 48 channels of digital I/O.
812 The base port addresses for the devices may be configured via the base
813 array module parameter.
816 tristate "IT87xx GPIO support"
818 Say yes here to support GPIO functionality of IT87xx Super I/O chips.
820 This driver is tested with ITE IT8728 and IT8732 Super I/O chips, and
821 supports the IT8761E, IT8613, IT8620E, and IT8628E Super I/O chips as
824 To compile this driver as a module, choose M here: the module will
828 tristate "Intel SCH/TunnelCreek/Centerton/Quark X1000 GPIO"
829 depends on (X86 || COMPILE_TEST) && PCI
833 Say yes here to support GPIO interface on Intel Poulsbo SCH,
834 Intel Tunnel Creek processor, Intel Centerton processor or
835 Intel Quark X1000 SoC.
837 The Intel SCH contains a total of 14 GPIO pins. Ten GPIOs are
838 powered by the core power rail and are turned off during sleep
839 modes (S3 and higher). The remaining four GPIOs are powered by
840 the Intel SCH suspend power supply. These GPIOs remain
841 active during S3. The suspend powered GPIOs can be used to wake the
842 system from the Suspend-to-RAM state.
844 The Intel Tunnel Creek processor has 5 GPIOs powered by the
845 core power rail and 9 from suspend power supply.
847 The Intel Centerton processor has a total of 30 GPIO pins.
848 Twenty-one are powered by the core power rail and 9 from the
849 suspend power supply.
851 The Intel Quark X1000 SoC has 2 GPIOs powered by the core
852 power well and 6 from the suspend power well.
855 tristate "SMSC SCH311x SuperI/O GPIO"
857 Driver to enable the GPIOs found on SMSC SMSC SCH3112, SCH3114 and
858 SCH3116 "Super I/O" chipsets.
860 To compile this driver as a module, choose M here: the module will
861 be called gpio-sch311x.
864 tristate "TS-5500 DIO blocks and compatibles"
865 depends on TS5500 || COMPILE_TEST
867 This driver supports Digital I/O exposed by pin blocks found on some
868 Technologic Systems platforms. It includes, but is not limited to, 3
869 blocks of the TS-5500: DIO1, DIO2 and the LCD port, and the TS-5600
873 tristate "Winbond Super I/O GPIO support"
876 This option enables support for GPIOs found on Winbond Super I/O
878 Currently, only W83627UHG (also known as Nuvoton NCT6627UD) is
881 You will need to provide a module parameter "gpios", or a
882 boot-time parameter "gpio_winbond.gpios" with a bitmask of GPIO
883 ports to enable (bit 0 is GPIO1, bit 1 is GPIO2, etc.).
885 To compile this driver as a module, choose M here: the module will
886 be called gpio-winbond.
889 tristate "WinSystems WS16C48 GPIO support"
891 select GPIOLIB_IRQCHIP
893 Enables GPIO support for the WinSystems WS16C48. The base port
894 addresses for the devices may be configured via the base module
895 parameter. The interrupt line numbers for the devices may be
896 configured via the irq module parameter.
900 menu "I2C GPIO expanders"
904 tristate "ADP5588 I2C GPIO expander"
906 This option enables support for 18 GPIOs found
907 on Analog Devices ADP5588 GPIO Expanders.
909 config GPIO_ADP5588_IRQ
910 bool "Interrupt controller support for ADP5588"
911 depends on GPIO_ADP5588=y
912 select GPIOLIB_IRQCHIP
914 Say yes here to enable the adp5588 to be used as an interrupt
915 controller. It requires the driver to be built in the kernel.
918 tristate "Avionic Design N-bit GPIO expander"
920 select GPIOLIB_IRQCHIP
922 This option enables support for N GPIOs found on Avionic Design
923 I2C GPIO expanders. The register space will be extended by powers
924 of two, so the controller will need to accommodate for that. For
925 example: if a controller provides 48 pins, 6 registers will be
926 enough to represent all pins, but the driver will assume a
927 register layout for 64 pins (8 registers).
930 tristate "Gateworks PLD GPIO Expander"
933 Say yes here to provide access to the Gateworks I2C PLD GPIO
934 Expander. This is used at least on the Cambria GW2358-4.
937 tristate "Maxim MAX7300 GPIO expander"
940 GPIO driver for Maxim MAX7300 I2C-based GPIO expander.
943 tristate "MAX7319, MAX7320-7327 I2C Port Expanders"
945 Say yes here to support the MAX7319, MAX7320-7327 series of I2C
946 Port Expanders. Each IO port on these chips has a fixed role of
947 Input (designated by 'I'), Push-Pull Output ('O'), or Open-Drain
948 Input and Output (designed by 'P'). The combinations are listed
951 8 bits: max7319 (8I), max7320 (8O), max7321 (8P),
952 max7322 (4I4O), max7323 (4P4O)
954 16 bits: max7324 (8I8O), max7325 (8P8O),
955 max7326 (4I12O), max7327 (4P12O)
957 Board setup code must specify the model to use, and the start
958 number for these GPIOs.
960 config GPIO_MAX732X_IRQ
961 bool "Interrupt controller support for MAX732x"
962 depends on GPIO_MAX732X=y
963 select GPIOLIB_IRQCHIP
965 Say yes here to enable the max732x to be used as an interrupt
966 controller. It requires the driver to be built in the kernel.
968 config GPIO_MC9S08DZ60
969 bool "MX35 3DS BOARD MC9S08DZ60 GPIO functions"
970 depends on I2C=y && MACH_MX35_3DS
972 Select this to enable the MC9S08DZ60 GPIO driver
975 tristate "PCA95[357]x, PCA9698, TCA64xx, and MAX7310 I/O ports"
978 Say yes here to provide access to several register-oriented
979 SMBus I/O expanders, made mostly by NXP or TI. Compatible
982 4 bits: pca9536, pca9537
984 8 bits: max7310, max7315, pca6107, pca9534, pca9538, pca9554,
985 pca9556, pca9557, pca9574, tca6408, tca9554, xra1202
987 16 bits: max7312, max7313, pca9535, pca9539, pca9555, pca9575,
992 40 bits: pca9505, pca9698
994 config GPIO_PCA953X_IRQ
995 bool "Interrupt controller support for PCA953x"
996 depends on GPIO_PCA953X
997 select GPIOLIB_IRQCHIP
999 Say yes here to enable the pca953x to be used as an interrupt
1000 controller. It requires the driver to be built in the kernel.
1003 tristate "PCA9570 4-Bit I2C GPO expander"
1005 Say yes here to enable the GPO driver for the NXP PCA9570 chip.
1007 To compile this driver as a module, choose M here: the module will
1008 be called gpio-pca9570.
1011 tristate "PCF857x, PCA{85,96}7x, and MAX732[89] I2C GPIO expanders"
1012 select GPIOLIB_IRQCHIP
1015 Say yes here to provide access to most "quasi-bidirectional" I2C
1016 GPIO expanders used for additional digital outputs or inputs.
1017 Most of these parts are from NXP, though TI is a second source for
1018 some of them. Compatible models include:
1020 8 bits: pcf8574, pcf8574a, pca8574, pca8574a,
1021 pca9670, pca9672, pca9674, pca9674a,
1024 16 bits: pcf8575, pcf8575c, pca8575,
1025 pca9671, pca9673, pca9675
1027 Your board setup code will need to declare the expanders in
1028 use, and assign numbers to the GPIOs they expose. Those GPIOs
1029 can then be used from drivers and other kernel code, just like
1030 other GPIOs, but only accessible from task contexts.
1032 This driver provides an in-kernel interface to those GPIOs using
1033 platform-neutral GPIO calls.
1035 config GPIO_TPIC2810
1036 tristate "TPIC2810 8-Bit I2C GPO expander"
1038 Say yes here to enable the GPO driver for the TI TPIC2810 chip.
1040 To compile this driver as a module, choose M here: the module will
1041 be called gpio-tpic2810.
1044 tristate "Technologic Systems FPGA I2C GPIO"
1045 depends on SOC_IMX6 || COMPILE_TEST
1048 Say yes here to enabled the GPIO driver for Technologic's FPGA core.
1049 Series supported include TS-4100, TS-4900, TS-7970 and TS-7990.
1053 menu "MFD GPIO expanders"
1056 tristate "GPIO Support for ADP5520 PMIC"
1057 depends on PMIC_ADP5520
1059 This option enables support for on-chip GPIO found
1060 on Analog Devices ADP5520 PMICs.
1062 config GPIO_ALTERA_A10SR
1063 tristate "Altera Arria10 System Resource GPIO"
1064 depends on MFD_ALTERA_A10SR
1066 Driver for Arria10 Development Kit GPIO expansion which
1067 includes reads of pushbuttons and DIP switches as well
1071 tristate "Wolfson Microelectronics Arizona class devices"
1072 depends on MFD_ARIZONA
1074 Support for GPIOs on Wolfson Arizona class devices.
1077 tristate "ROHM BD70528 GPIO support"
1078 depends on MFD_ROHM_BD70528
1080 Support for GPIOs on ROHM BD70528 PMIC. There are four GPIOs
1081 available on the ROHM PMIC in total. The GPIOs can also
1082 generate interrupts.
1084 This driver can also be built as a module. If so, the module
1085 will be called gpio-bd70528.
1088 tristate "ROHM BD71828 GPIO support"
1089 depends on MFD_ROHM_BD71828
1091 Support for GPIOs on ROHM BD71828 PMIC. There are three GPIOs
1092 available on the ROHM PMIC in total. The GPIOs are limited to
1093 outputs only and pins must be configured to GPIO outputs by
1094 OTP. Enable this only if you want to use these pins as outputs.
1096 This driver can also be built as a module. If so, the module
1097 will be called gpio-bd71828.
1099 config GPIO_BD9571MWV
1100 tristate "ROHM BD9571 GPIO support"
1101 depends on MFD_BD9571MWV
1103 Support for GPIOs on ROHM BD9571 PMIC. There are two GPIOs
1104 available on the ROHM PMIC in total, both of which can also
1105 generate interrupts.
1107 This driver can also be built as a module. If so, the module
1108 will be called gpio-bd9571mwv.
1110 config GPIO_CRYSTAL_COVE
1111 tristate "GPIO support for Crystal Cove PMIC"
1112 depends on (X86 || COMPILE_TEST) && INTEL_SOC_PMIC
1113 select GPIOLIB_IRQCHIP
1115 Support for GPIO pins on Crystal Cove PMIC.
1117 Say Yes if you have a Intel SoC based tablet with Crystal Cove PMIC
1120 This driver can also be built as a module. If so, the module will be
1121 called gpio-crystalcove.
1124 tristate "AMD CS5535/CS5536 GPIO support"
1125 depends on X86 || MIPS || COMPILE_TEST
1126 depends on MFD_CS5535
1128 The AMD CS5535 and CS5536 southbridges support 28 GPIO pins that
1129 can be used for quite a number of things. The CS5535/6 is found on
1130 AMD Geode and Lemote Yeeloong devices.
1135 tristate "Dialog DA9052 GPIO"
1136 depends on PMIC_DA9052
1138 Say yes here to enable the GPIO driver for the DA9052 chip.
1141 tristate "Dialog Semiconductor DA9055 GPIO"
1142 depends on MFD_DA9055
1144 Say yes here to enable the GPIO driver for the DA9055 chip.
1146 The Dialog DA9055 PMIC chip has 3 GPIO pins that can be
1147 be controller by this driver.
1149 If driver is built as a module it will be called gpio-da9055.
1152 tristate "Diolan DLN2 GPIO support"
1154 select GPIOLIB_IRQCHIP
1157 Select this option to enable GPIO driver for the Diolan DLN2
1160 This driver can also be built as a module. If so, the module
1161 will be called gpio-dln2.
1164 bool "HTC EGPIO support"
1167 This driver supports the CPLD egpio chip present on
1168 several HTC phones. It provides basic support for input
1169 pins, output pins, and irqs.
1171 config GPIO_JANZ_TTL
1172 tristate "Janz VMOD-TTL Digital IO Module"
1173 depends on MFD_JANZ_CMODIO
1175 This enables support for the Janz VMOD-TTL Digital IO module.
1176 This driver provides support for driving the pins in output
1177 mode only. Input mode is not supported.
1180 tristate "Kontron ETX / COMexpress GPIO"
1181 depends on MFD_KEMPLD
1183 This enables support for the PLD GPIO interface on some Kontron ETX
1184 and COMexpress (ETXexpress) modules.
1186 This driver can also be built as a module. If so, the module will be
1190 tristate "TI/National Semiconductor LP3943 GPIO expander"
1191 depends on MFD_LP3943
1193 GPIO driver for LP3943 MFD.
1194 LP3943 can be used as a GPIO expander which provides up to 16 GPIOs.
1195 Open drain outputs are required for this usage.
1198 tristate "TI LP873X GPO"
1199 depends on MFD_TI_LP873X
1201 This driver supports the GPO on TI Lp873x PMICs. 2 GPOs are present
1204 This driver can also be built as a module. If so, the module will be
1208 tristate "TI LP87565 GPIO"
1209 depends on MFD_TI_LP87565
1211 This driver supports the GPIO on TI Lp873565 PMICs. 3 GPIOs are present
1214 This driver can also be built as a module. If so, the module will be
1215 called gpio-lp87565.
1218 tristate "Cirrus Logic Madera class codecs"
1219 depends on PINCTRL_MADERA
1221 Support for GPIOs on Cirrus Logic Madera class codecs.
1223 config GPIO_MAX77620
1224 tristate "GPIO support for PMIC MAX77620 and MAX20024"
1225 depends on MFD_MAX77620
1226 select GPIOLIB_IRQCHIP
1228 GPIO driver for MAX77620 and MAX20024 PMIC from Maxim Semiconductor.
1229 MAX77620 PMIC has 8 pins that can be configured as GPIOs. The
1230 driver also provides interrupt support for each of the gpios.
1231 Say yes here to enable the max77620 to be used as gpio controller.
1233 config GPIO_MAX77650
1234 tristate "Maxim MAX77650/77651 GPIO support"
1235 depends on MFD_MAX77650
1237 GPIO driver for MAX77650/77651 PMIC from Maxim Semiconductor.
1238 These chips have a single pin that can be configured as GPIO.
1241 bool "Intel MSIC mixed signal gpio support"
1242 depends on (X86 || COMPILE_TEST) && MFD_INTEL_MSIC
1244 Enable support for GPIO on intel MSIC controllers found in
1248 bool "TI PALMAS series PMICs GPIO"
1249 depends on MFD_PALMAS
1251 Select this option to enable GPIO driver for the TI PALMAS
1255 bool "RICOH RC5T583 GPIO"
1256 depends on MFD_RC5T583
1258 Select this option to enable GPIO driver for the Ricoh RC5T583
1260 This driver provides the support for driving/reading the gpio pins
1261 of RC5T583 device through standard gpio library.
1263 config GPIO_SL28CPLD
1264 tristate "Kontron sl28cpld GPIO support"
1265 depends on MFD_SL28CPLD || COMPILE_TEST
1267 select GPIOLIB_IRQCHIP
1270 This enables support for the GPIOs found on the Kontron sl28 CPLD.
1272 This driver can also be built as a module. If so, the module will be
1273 called gpio-sl28cpld.
1277 depends on MFD_STMPE
1279 select GPIOLIB_IRQCHIP
1281 This enables support for the GPIOs found on the STMPE I/O
1285 bool "TC3589X GPIOs"
1286 depends on MFD_TC3589X
1288 select GPIOLIB_IRQCHIP
1290 This enables support for the GPIOs found on the TC3589X
1293 config GPIO_TIMBERDALE
1294 bool "Support for timberdale GPIO IP"
1295 depends on MFD_TIMBERDALE
1297 Add support for the GPIO IP in the timberdale FPGA.
1299 config GPIO_TPS65086
1300 tristate "TI TPS65086 GPO"
1301 depends on MFD_TPS65086
1303 This driver supports the GPO on TI TPS65086x PMICs.
1305 config GPIO_TPS65218
1306 tristate "TPS65218 GPIO"
1307 depends on MFD_TPS65218
1309 Select this option to enable GPIO driver for the TPS65218
1312 config GPIO_TPS6586X
1313 bool "TPS6586X GPIO"
1314 depends on MFD_TPS6586X
1316 Select this option to enable GPIO driver for the TPS6586X
1319 config GPIO_TPS65910
1320 bool "TPS65910 GPIO"
1321 depends on MFD_TPS65910
1323 Select this option to enable GPIO driver for the TPS65910
1326 config GPIO_TPS65912
1327 tristate "TI TPS65912 GPIO"
1328 depends on MFD_TPS65912
1330 This driver supports TPS65912 gpio chip
1332 config GPIO_TPS68470
1333 bool "TPS68470 GPIO"
1334 depends on MFD_TPS68470
1336 Select this option to enable GPIO driver for the TPS68470
1338 There are 7 GPIOs and few sensor related GPIOs supported
1339 by the TPS68470. While the 7 GPIOs can be configured as
1340 input or output as appropriate, the sensor related GPIOs
1341 are "output only" GPIOs.
1343 This driver config is bool, as the GPIO functionality
1344 of the TPS68470 must be available before dependent
1348 tristate "TQ-Systems QTMX86 GPIO"
1349 depends on MFD_TQMX86 || COMPILE_TEST
1350 select GPIOLIB_IRQCHIP
1352 This driver supports GPIO on the TQMX86 IO controller.
1355 tristate "TWL4030, TWL5030, and TPS659x0 GPIOs"
1356 depends on TWL4030_CORE
1358 Say yes here to access the GPIO signals of various multi-function
1359 power management chips from Texas Instruments.
1362 tristate "TWL6040 GPO"
1363 depends on TWL6040_CORE
1365 Say yes here to access the GPO signals of twl6040
1366 audio chip from Texas Instruments.
1369 tristate "Philips UCB1400 GPIO"
1370 depends on UCB1400_CORE
1372 This enables support for the Philips UCB1400 GPIO pins.
1373 The UCB1400 is an AC97 audio codec.
1375 config GPIO_WHISKEY_COVE
1376 tristate "GPIO support for Whiskey Cove PMIC"
1377 depends on (X86 || COMPILE_TEST) && INTEL_SOC_PMIC_BXTWC
1378 select GPIOLIB_IRQCHIP
1380 Support for GPIO pins on Whiskey Cove PMIC.
1382 Say Yes if you have a Intel SoC based tablet with Whiskey Cove PMIC
1385 This driver can also be built as a module. If so, the module will be
1389 tristate "WM831x GPIOs"
1390 depends on MFD_WM831X
1392 Say yes here to access the GPIO signals of WM831x power management
1393 chips from Wolfson Microelectronics.
1396 tristate "WM8350 GPIOs"
1397 depends on MFD_WM8350
1399 Say yes here to access the GPIO signals of WM8350 power management
1400 chips from Wolfson Microelectronics.
1403 tristate "WM8994 GPIOs"
1404 depends on MFD_WM8994
1406 Say yes here to access the GPIO signals of WM8994 audio hub
1407 CODECs from Wolfson Microelectronics.
1411 menu "PCI GPIO expanders"
1415 tristate "AMD 8111 GPIO driver"
1416 depends on X86 || COMPILE_TEST
1418 The AMD 8111 south bridge contains 32 GPIO pins which can be used.
1420 Note, that usually system firmware/ACPI handles GPIO pins on their
1421 own and users might easily break their systems with uncarefull usage
1427 tristate "BT8XX GPIO abuser"
1428 depends on VIDEO_BT848=n
1430 The BT8xx frame grabber chip has 24 GPIO pins that can be abused
1431 as a cheap PCI GPIO card.
1433 This chip can be found on Miro, Hauppauge and STB TV-cards.
1435 The card needs to be physically altered for using it as a
1436 GPIO card. For more information on how to build a GPIO card
1437 from a BT8xx TV card, see the documentation file at
1438 Documentation/driver-api/gpio/bt8xxgpio.rst
1442 config GPIO_INTEL_MID
1443 bool "Intel MID GPIO support"
1444 depends on X86_INTEL_MID
1445 select GPIOLIB_IRQCHIP
1447 Say Y here to support Intel MID GPIO.
1449 config GPIO_MERRIFIELD
1450 tristate "Intel Merrifield GPIO support"
1451 depends on X86_INTEL_MID
1452 select GPIOLIB_IRQCHIP
1454 Say Y here to support Intel Merrifield GPIO.
1457 tristate "Mellanox BlueField SoC GPIO"
1458 depends on (MELLANOX_PLATFORM && ARM64 && ACPI) || (64BIT && COMPILE_TEST)
1461 Say Y here if you want GPIO support on Mellanox BlueField SoC.
1464 tristate "Mellanox BlueField 2 SoC GPIO"
1465 depends on (MELLANOX_PLATFORM && ARM64 && ACPI) || (64BIT && COMPILE_TEST)
1468 Say Y here if you want GPIO support on Mellanox BlueField 2 SoC.
1471 tristate "OKI SEMICONDUCTOR ML7213 IOH GPIO support"
1472 depends on X86 || COMPILE_TEST
1473 select GENERIC_IRQ_CHIP
1475 ML7213 is companion chip for Intel Atom E6xx series.
1476 This driver can be used for OKI SEMICONDUCTOR ML7213 IOH(Input/Output
1477 Hub) which is for IVI(In-Vehicle Infotainment) use.
1478 This driver can access the IOH's GPIO device.
1481 tristate "Intel EG20T PCH/LAPIS Semiconductor IOH(ML7223/ML7831) GPIO"
1482 depends on X86_32 || MIPS || COMPILE_TEST
1483 select GENERIC_IRQ_CHIP
1485 This driver is for PCH(Platform controller Hub) GPIO of Intel Topcliff
1486 which is an IOH(Input/Output Hub) for x86 embedded processor.
1487 This driver can access PCH GPIO device.
1489 This driver also can be used for LAPIS Semiconductor IOH(Input/
1490 Output Hub), ML7223 and ML7831.
1491 ML7223 IOH is for MP(Media Phone) use.
1492 ML7831 IOH is for general purpose use.
1493 ML7223/ML7831 is companion chip for Intel Atom E6xx series.
1494 ML7223/ML7831 is completely compatible for Intel EG20T PCH.
1496 config GPIO_PCI_IDIO_16
1497 tristate "ACCES PCI-IDIO-16 GPIO support"
1498 select GPIOLIB_IRQCHIP
1500 Enables GPIO support for the ACCES PCI-IDIO-16. An interrupt is
1501 generated when any of the inputs change state (low to high or high to
1502 low). Input filter control is not supported by this driver, and the
1503 input filters are deactivated by this driver.
1505 config GPIO_PCIE_IDIO_24
1506 tristate "ACCES PCIe-IDIO-24 GPIO support"
1507 select GPIOLIB_IRQCHIP
1509 Enables GPIO support for the ACCES PCIe-IDIO-24 family (PCIe-IDIO-24,
1510 PCIe-IDI-24, PCIe-IDO-24, PCIe-IDIO-12). An interrupt is generated
1511 when any of the inputs change state (low to high or high to low).
1512 Input filter control is not supported by this driver, and the input
1513 filters are deactivated by this driver.
1516 tristate "RDC R-321x GPIO support"
1520 Support for the RDC R321x SoC GPIOs over southbridge
1521 PCI configuration space.
1523 config GPIO_SODAVILLE
1524 bool "Intel Sodaville GPIO support"
1525 depends on X86 && OF
1527 select GENERIC_IRQ_CHIP
1529 Say Y here to support Intel Sodaville GPIO.
1533 menu "SPI GPIO expanders"
1534 depends on SPI_MASTER
1537 tristate "74x164 serial-in/parallel-out 8-bits shift register"
1540 Driver for 74x164 compatible serial-in/parallel-out 8-outputs
1541 shift registers. This driver can be used to provide access
1542 to more gpio outputs.
1544 config GPIO_MAX3191X
1545 tristate "Maxim MAX3191x industrial serializer"
1548 GPIO driver for Maxim MAX31910, MAX31911, MAX31912, MAX31913,
1549 MAX31953 and MAX31963 industrial serializer, a daisy-chainable
1550 chip to make 8 digital 24V inputs available via SPI. Supports
1551 CRC checksums to guard against electromagnetic interference,
1552 as well as undervoltage and overtemperature detection.
1555 tristate "Maxim MAX7301 GPIO expander"
1558 GPIO driver for Maxim MAX7301 SPI-based GPIO expander.
1561 tristate "Freescale MC33880 high-side/low-side switch"
1563 SPI driver for Freescale MC33880 high-side/low-side switch.
1564 This provides GPIO interface supporting inputs and outputs.
1567 tristate "Generic parallel-in/serial-out shift register"
1569 GPIO driver for SPI compatible parallel-in/serial-out shift
1570 registers. These are input only devices.
1573 tristate "EXAR XRA1403 16-bit GPIO expander"
1576 GPIO driver for EXAR XRA1403 16-bit SPI-based GPIO expander.
1579 tristate "Turris Mox Moxtet bus GPIO expander"
1582 Say yes here if you are building for the Turris Mox router.
1583 This is the driver needed for configuring the GPIOs via the Moxtet
1584 bus. For example the Mox module with SFP cage needs this driver
1585 so that phylink can use corresponding GPIOs.
1589 menu "USB GPIO expanders"
1592 config GPIO_VIPERBOARD
1593 tristate "Viperboard GPIO a & b support"
1594 depends on MFD_VIPERBOARD
1596 Say yes here to access the GPIO signals of Nano River
1597 Technologies Viperboard. There are two GPIO chips on the
1598 board: gpioa and gpiob.
1599 See viperboard API specification and Nano
1600 River Tech's viperboard.h for detailed meaning
1601 of the module parameters.
1605 config GPIO_AGGREGATOR
1606 tristate "GPIO Aggregator"
1608 Say yes here to enable the GPIO Aggregator, which provides a way to
1609 aggregate existing GPIO lines into a new virtual GPIO chip.
1610 This can serve the following purposes:
1611 - Assign permissions for a collection of GPIO lines to a user,
1612 - Export a collection of GPIO lines to a virtual machine,
1613 - Provide a generic driver for a GPIO-operated device in an
1614 industrial control context, to be operated from userspace using
1615 the GPIO chardev interface.
1618 tristate "GPIO Testing Driver"
1621 This enables GPIO Testing driver, which provides a way to test GPIO
1622 subsystem through sysfs(or char device) and debugfs. GPIO_SYSFS
1623 must be selected for this test.
1624 User could use it through the script in
1625 tools/testing/selftests/gpio/gpio-mockup.sh. Reference the usage in