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)"
65 Say Y here to add the legacy sysfs interface for GPIOs.
67 This ABI is deprecated. If you want to use GPIO from userspace,
68 use the character device /dev/gpiochipN with the appropriate
69 ioctl() operations instead.
73 prompt "Character device (/dev/gpiochipN) support" if EXPERT
76 Say Y here to add the character device /dev/gpiochipN interface
77 for GPIOs. The character device allows userspace to control GPIOs
78 using ioctl() operations.
80 Only say N if you are sure that the GPIO character device is not
86 bool "Support GPIO ABI Version 1"
90 Say Y here to support version 1 of the GPIO CDEV ABI.
92 This ABI version is deprecated.
93 Please use the latest ABI for new developments.
98 depends on HAS_IOMEM # Only for IOMEM drivers
105 # put drivers in the right section, in alphabetical order
107 # This symbol is selected by both I2C and SPI expanders
111 menu "Memory mapped GPIO drivers"
114 config GPIO_74XX_MMIO
115 tristate "GPIO driver for 74xx-ICs with MMIO access"
119 Say yes here to support GPIO functionality for 74xx-compatible ICs
120 with MMIO access. Compatible models include:
121 1 bit: 741G125 (Input), 741G74 (Output)
122 2 bits: 742G125 (Input), 7474 (Output)
123 4 bits: 74125 (Input), 74175 (Output)
124 6 bits: 74365 (Input), 74174 (Output)
125 8 bits: 74244 (Input), 74273 (Output)
126 16 bits: 741624 (Input), 7416374 (Output)
129 tristate "Altera GPIO"
131 select GPIOLIB_IRQCHIP
133 Say Y or M here to build support for the Altera PIO device.
135 If driver is built as a module it will be called gpio-altera.
138 tristate "AMD Promontory GPIO support"
142 driver for GPIO functionality on Promontory IOHub
143 Require ACPI ASL code to enumerate as a platform device.
146 tristate "Aspeed GPIO support"
147 depends on (ARCH_ASPEED || COMPILE_TEST) && OF_GPIO
148 select GPIOLIB_IRQCHIP
150 Say Y here to support Aspeed AST2400 and AST2500 GPIO controllers.
152 config GPIO_ASPEED_SGPIO
153 bool "Aspeed SGPIO support"
154 depends on (ARCH_ASPEED || COMPILE_TEST) && OF_GPIO
156 select GPIOLIB_IRQCHIP
158 Say Y here to support Aspeed AST2500 SGPIO functionality.
161 tristate "Atheros AR71XX/AR724X/AR913X GPIO support"
163 depends on ATH79 || COMPILE_TEST
165 select GPIOLIB_IRQCHIP
167 Select this option to enable GPIO driver for
168 Atheros AR71XX/AR724X/AR913X SoC devices.
170 config GPIO_RASPBERRYPI_EXP
171 tristate "Raspberry Pi 3 GPIO Expander"
172 default RASPBERRYPI_FIRMWARE
174 # Make sure not 'y' when RASPBERRYPI_FIRMWARE is 'm'. This can only
175 # happen when COMPILE_TEST=y, hence the added !RASPBERRYPI_FIRMWARE.
176 depends on (ARCH_BCM2835 && RASPBERRYPI_FIRMWARE) || (COMPILE_TEST && !RASPBERRYPI_FIRMWARE)
178 Turn on GPIO support for the expander on Raspberry Pi 3 boards, using
179 the firmware mailbox to communicate with VideoCore on BCM283x chips.
182 bool "Broadcom Kona GPIO"
183 depends on OF_GPIO && (ARCH_BCM_MOBILE || COMPILE_TEST)
185 Turn on GPIO support for Broadcom "Kona" chips.
187 config GPIO_BCM_XGS_IPROC
188 tristate "BRCM XGS iProc GPIO support"
189 depends on OF_GPIO && (ARCH_BCM_IPROC || COMPILE_TEST)
191 select GPIOLIB_IRQCHIP
192 default ARCH_BCM_IPROC
194 Say yes here to enable GPIO support for Broadcom XGS iProc SoCs.
197 tristate "BRCMSTB GPIO support"
198 default y if (ARCH_BRCMSTB || BMIPS_GENERIC)
199 depends on OF_GPIO && (ARCH_BRCMSTB || BMIPS_GENERIC || COMPILE_TEST)
203 Say yes here to enable GPIO support for Broadcom STB (BCM7XXX) SoCs.
206 tristate "Cadence GPIO support"
209 select GPIOLIB_IRQCHIP
211 Say yes here to enable support for Cadence GPIO controller.
214 tristate "CLPS711X GPIO support"
215 depends on ARCH_CLPS711X || COMPILE_TEST
218 Say yes here to support GPIO on CLPS711X SoCs.
221 bool "TI Davinci/Keystone GPIO support"
222 default y if ARCH_DAVINCI
223 depends on (ARM || ARM64) && (ARCH_DAVINCI || ARCH_KEYSTONE || ARCH_K3)
225 Say yes here to enable GPIO support for TI Davinci/Keystone SoCs.
228 tristate "Synopsys DesignWare APB GPIO driver"
230 select GPIOLIB_IRQCHIP
232 Say Y or M here to build support for the Synopsys DesignWare APB
236 tristate "Spreadtrum EIC support"
237 depends on ARCH_SPRD || COMPILE_TEST
239 select GPIOLIB_IRQCHIP
241 Say yes here to support Spreadtrum EIC device.
244 tristate "Emma Mobile GPIO"
245 depends on (ARCH_EMEV2 || COMPILE_TEST) && OF_GPIO
247 Say yes here to support GPIO on Renesas Emma Mobile SoCs.
251 depends on ARCH_EP93XX
253 select GPIOLIB_IRQCHIP
256 tristate "Support for GPIO pins on XR17V352/354/358"
257 depends on SERIAL_8250_EXAR
259 Selecting this option will enable handling of GPIO pins present
260 on Exar XR17V352/354/358 chips.
263 bool "GE FPGA based GPIO"
267 Support for common GPIO functionality provided on some GE Single Board
270 This driver provides basic support (configure as input or output, read
271 and write pin state) for GPIO implemented in a number of GE single
274 config GPIO_FTGPIO010
275 bool "Faraday FTGPIO010 GPIO"
278 select GPIOLIB_IRQCHIP
279 default (ARCH_GEMINI || ARCH_MOXART)
281 Support for common GPIOs from the Faraday FTGPIO010 IP core, found in
282 Cortina systems Gemini platforms, Moxa ART and others.
284 config GPIO_GENERIC_PLATFORM
285 tristate "Generic memory-mapped GPIO controller support (MMIO platform device)"
288 Say yes here to support basic platform_device memory-mapped GPIO controllers.
291 tristate "Aeroflex Gaisler GRGPIO support"
296 Select this to support Aeroflex Gaisler GRGPIO cores from the GRLIB
297 VHDL IP core library.
300 tristate "Nintendo Wii (Hollywood) GPIO"
303 select GPIOLIB_IRQCHIP
305 Select this to support the GPIO controller of the Nintendo Wii.
310 tristate "Intel ICH GPIO"
311 depends on PCI && X86
315 Say yes here to support the GPIO functionality of a number of Intel
316 ICH-based chipsets. Currently supported devices: ICH6, ICH7, ICH8
317 ICH9, ICH10, Series 5/3400 (eg Ibex Peak), Series 6/C200 (eg
318 Cougar Point), NM10 (Tiger Point), and 3100 (Whitmore Lake).
323 tristate "Intel IOP GPIO"
324 depends on ARCH_IOP32X || COMPILE_TEST
327 Say yes here to support the GPIO functionality of a number of Intel
333 bool "Intel IXP4xx GPIO"
334 depends on ARM # For <asm/mach-types.h>
335 depends on ARCH_IXP4XX
337 select GPIOLIB_IRQCHIP
338 select IRQ_DOMAIN_HIERARCHY
340 Say yes here to support the GPIO functionality of a number of Intel
341 IXP4xx series of chips.
345 tristate "Xylon LogiCVC GPIO support"
346 depends on MFD_SYSCON && OF
348 Say yes here to support GPIO functionality of the Xylon LogiCVC
349 programmable logic block.
352 bool "Loongson-2/3 GPIO support"
353 depends on CPU_LOONGSON2EF || CPU_LOONGSON64
355 driver for GPIO functionality on Loongson-2F/3A/3B processors.
358 tristate "NXP LPC18XX/43XX GPIO support"
359 default y if ARCH_LPC18XX
360 depends on OF_GPIO && (ARCH_LPC18XX || COMPILE_TEST)
361 select IRQ_DOMAIN_HIERARCHY
363 Select this option to enable GPIO driver for
364 NXP LPC18XX/43XX devices.
367 tristate "NXP LPC32XX GPIO support"
368 depends on OF_GPIO && (ARCH_LPC32XX || COMPILE_TEST)
370 Select this option to enable GPIO driver for
374 tristate "GPIO support for Fujitsu MB86S7x Platforms"
376 Say yes here to support the GPIO controller in Fujitsu MB86S70 SoCs.
379 tristate "MEN 16Z127 GPIO support"
383 Say yes here to support the MEN 16Z127 GPIO Controller
385 config GPIO_MM_LANTIQ
386 bool "Lantiq Memory mapped GPIOs"
387 depends on LANTIQ && SOC_XWAY
389 This enables support for memory mapped GPIOs on the External Bus Unit
390 (EBU) found on Lantiq SoCs. The gpios are output only as they are
391 created by attaching a 16bit latch to the bus.
395 depends on PPC_MPC52xx
398 bool "MPC512x/MPC8xxx/QorIQ GPIO support"
399 depends on PPC_MPC512x || PPC_MPC831x || PPC_MPC834x || PPC_MPC837x || \
400 FSL_SOC_BOOKE || PPC_86xx || ARCH_LAYERSCAPE || ARM || \
405 Say Y here if you're going to use hardware that connects to the
406 MPC512x/831x/834x/837x/8572/8610/QorIQ GPIOs.
409 bool "Mediatek MT7621 GPIO Support"
410 depends on SOC_MT7620 || SOC_MT7621 || COMPILE_TEST
413 select GPIOLIB_IRQCHIP
415 Say yes here to support the Mediatek MT7621 SoC GPIO device
419 depends on PLAT_ORION || ARCH_MVEBU
421 select GENERIC_IRQ_CHIP
425 tristate "i.MX GPIO support"
426 depends on ARCH_MXC || COMPILE_TEST
428 select GENERIC_IRQ_CHIP
431 bool "Freescale MXS GPIO support" if COMPILE_TEST
432 depends on ARCH_MXS || COMPILE_TEST
433 default y if ARCH_MXS
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"
513 select IRQ_DOMAIN_HIERARCHY
515 select GPIOLIB_IRQCHIP
518 Say yes here to support the GPIO device on SiFive SoCs.
521 tristate "SIOX GPIO support"
523 select GPIOLIB_IRQCHIP
525 Say yes here to support SIOX I/O devices. These are units connected
526 via a SIOX bus and have a number of fixed-direction I/O lines.
528 config GPIO_SNPS_CREG
529 bool "Synopsys GPIO via CREG (Control REGisters) driver"
530 depends on ARC || COMPILE_TEST
533 This driver supports GPIOs via CREG on various Synopsys SoCs.
534 This is a single-register MMIO GPIO driver for complex cases
535 where only several fields in register belong to GPIO lines and
536 each GPIO line owns a field with different length and on/off value.
538 config GPIO_SPEAR_SPICS
539 bool "ST SPEAr13xx SPI Chip Select as GPIO support"
540 depends on PLAT_SPEAR
541 select GENERIC_IRQ_CHIP
543 Say yes here to support ST SPEAr SPI Chip Select as GPIO device
546 tristate "Spreadtrum GPIO support"
547 depends on ARCH_SPRD || COMPILE_TEST
549 select GPIOLIB_IRQCHIP
551 Say yes here to support Spreadtrum GPIO device.
554 bool "STA2x11/ConneXt GPIO support"
555 depends on MFD_STA2X11
556 select GENERIC_IRQ_CHIP
558 Say yes here to support the STA2x11/ConneXt GPIO device.
559 The GPIO module has 128 GPIO pins with alternate functions.
562 bool "XWAY STP GPIOs"
563 depends on SOC_XWAY || COMPILE_TEST
566 This enables support for the Serial To Parallel (STP) unit found on
567 XWAY SoC. The STP allows the SoC to drive a shift registers cascade,
568 that can be up to 24 bit. This peripheral is aimed at driving leds.
569 Some of the gpios/leds can be auto updated by the soc with dsl and
573 tristate "GPIO based on SYSCON"
574 depends on MFD_SYSCON && OF
576 Say yes here to support GPIO functionality though SYSCON driver.
581 select GENERIC_IRQ_CHIP
585 bool "NVIDIA Tegra GPIO support"
587 depends on ARCH_TEGRA || COMPILE_TEST
590 Say yes here to support GPIO pins on NVIDIA Tegra SoCs.
593 tristate "NVIDIA Tegra186 GPIO support"
594 default ARCH_TEGRA_186_SOC || ARCH_TEGRA_194_SOC
595 depends on ARCH_TEGRA_186_SOC || ARCH_TEGRA_194_SOC || COMPILE_TEST
597 select GPIOLIB_IRQCHIP
598 select IRQ_DOMAIN_HIERARCHY
600 Say yes here to support GPIO pins on NVIDIA Tegra186 SoCs.
603 tristate "TS-4800 DIO blocks and compatibles"
605 depends on SOC_IMX51 || COMPILE_TEST
608 This driver support TS-4800 FPGA GPIO controllers.
611 tristate "Cavium ThunderX/OCTEON-TX GPIO"
612 depends on ARCH_THUNDER || (64BIT && COMPILE_TEST)
614 select GPIOLIB_IRQCHIP
615 select IRQ_DOMAIN_HIERARCHY
616 select IRQ_FASTEOI_HIERARCHY_HANDLERS
618 Say yes here to support the on-chip GPIO lines on the ThunderX
619 and OCTEON-TX families of SoCs.
622 tristate "UniPhier GPIO support"
623 depends on ARCH_UNIPHIER || COMPILE_TEST
625 select IRQ_DOMAIN_HIERARCHY
627 Say yes here to support UniPhier GPIOs.
631 depends on ARCH_MXC && SOC_VF610
632 select GPIOLIB_IRQCHIP
634 Say yes here to support Vybrid vf610 GPIOs.
637 tristate "NEC VR4100 series General-purpose I/O Uint support"
638 depends on CPU_VR41XX
640 Say yes here to support the NEC VR4100 series General-purpose I/O Uint
643 tristate "VIA VX855/VX875 GPIO"
644 depends on (X86 || COMPILE_TEST) && PCI
648 Support access to the VX855/VX875 GPIO lines through the gpio library.
650 This driver provides common support for accessing the device,
651 additional drivers must be enabled in order to use the
652 functionality of the device.
655 tristate "Qualcomm Technologies Inc WCD9340/WCD9341 gpio controller driver"
656 depends on MFD_WCD934X && OF_GPIO
658 This driver is to supprot GPIO block found on the Qualcomm Technologies
659 Inc WCD9340/WCD9341 Audio Codec.
662 bool "APM X-Gene GPIO controller support"
663 depends on ARM64 && OF_GPIO
665 This driver is to support the GPIO block within the APM X-Gene SoC
666 platform's generic flash controller. The GPIO pins are muxed with
667 the generic flash controller's address and data pins. Say yes
668 here to enable the GFC GPIO functionality.
671 tristate "APM X-Gene GPIO standby controller support"
672 depends on (ARCH_XGENE || COMPILE_TEST)
674 select GPIOLIB_IRQCHIP
675 select IRQ_DOMAIN_HIERARCHY
677 This driver supports the GPIO block within the APM X-Gene
678 Standby Domain. Say yes here to enable the GPIO functionality.
681 tristate "Xilinx GPIO support"
683 Say yes here to support the Xilinx FPGA GPIO device
686 tristate "Netlogic XLP GPIO support"
687 depends on OF_GPIO && (CPU_XLP || ARCH_THUNDER2 || COMPILE_TEST)
688 select GPIOLIB_IRQCHIP
690 This driver provides support for GPIO interface on Netlogic XLP MIPS64
691 SoCs. Currently supported XLP variants are XLP8XX, XLP3XX, XLP2XX,
692 XLP9XX and XLP5XX. The same GPIO controller block is also present in
693 Cavium's ThunderX2 CN99XX SoCs.
698 bool "Xtensa GPIO32 support"
700 depends on HAVE_XTENSA_GPIO32
703 Say yes here to support the Xtensa internal GPIO32 IMPWIRE (input)
704 and EXPSTATE (output) ports
707 bool "LSI ZEVIO SoC memory mapped GPIOs"
708 depends on ARM && OF_GPIO
710 Say yes here to support the GPIO controller in LSI ZEVIO SoCs.
713 tristate "Xilinx Zynq GPIO support"
714 depends on ARCH_ZYNQ || ARCH_ZYNQMP
715 select GPIOLIB_IRQCHIP
717 Say yes here to support Xilinx Zynq GPIO controller.
720 bool "ZTE ZX GPIO support"
721 depends on ARCH_ZX || COMPILE_TEST
722 select GPIOLIB_IRQCHIP
724 Say yes here to support the GPIO device on ZTE ZX SoCs.
726 config GPIO_LOONGSON1
727 tristate "Loongson1 GPIO support"
728 depends on MACH_LOONGSON32
731 Say Y or M here to support GPIO on Loongson1 SoCs.
734 tristate "GPIO support for AMD Fusion Controller Hub (G-series SOCs)"
736 This option enables driver for GPIO on AMDs Fusion Controller Hub,
737 as found on G-series SOCs (eg. GX-412TC)
739 Note: This driver doesn't registers itself automatically, as it
740 needs to be provided with platform specific configuration.
741 (See eg. CONFIG_PCENGINES_APU2.)
744 menu "Port-mapped I/O GPIO drivers"
745 depends on X86 # Unconditional I/O space access
747 config GPIO_104_DIO_48E
748 tristate "ACCES 104-DIO-48E GPIO support"
751 select GPIOLIB_IRQCHIP
753 Enables GPIO support for the ACCES 104-DIO-48E series (104-DIO-48E,
754 104-DIO-24E). The base port addresses for the devices may be
755 configured via the base module parameter. The interrupt line numbers
756 for the devices may be configured via the irq module parameter.
758 config GPIO_104_IDIO_16
759 tristate "ACCES 104-IDIO-16 GPIO support"
762 select GPIOLIB_IRQCHIP
764 Enables GPIO support for the ACCES 104-IDIO-16 family (104-IDIO-16,
765 104-IDIO-16E, 104-IDO-16, 104-IDIO-8, 104-IDIO-8E, 104-IDO-8). The
766 base port addresses for the devices may be configured via the base
767 module parameter. The interrupt line numbers for the devices may be
768 configured via the irq module parameter.
770 config GPIO_104_IDI_48
771 tristate "ACCES 104-IDI-48 GPIO support"
774 select GPIOLIB_IRQCHIP
776 Enables GPIO support for the ACCES 104-IDI-48 family (104-IDI-48A,
777 104-IDI-48AC, 104-IDI-48B, 104-IDI-48BC). The base port addresses for
778 the devices may be configured via the base module parameter. The
779 interrupt line numbers for the devices may be configured via the irq
783 tristate "F71869, F71869A, F71882FG, F71889F and F81866 GPIO support"
785 This option enables support for GPIOs found on Fintek Super-I/O
786 chips F71869, F71869A, F71882FG, F71889F and F81866.
788 To compile this driver as a module, choose M here: the module will
789 be called f7188x-gpio.
792 tristate "Diamond Systems GPIO-MM GPIO support"
796 Enables GPIO support for the Diamond Systems GPIO-MM and GPIO-MM-12.
798 The Diamond Systems GPIO-MM device features 48 lines of digital I/O
799 via the emulation of dual 82C55A PPI chips. This driver provides GPIO
800 support for these 48 channels of digital I/O.
802 The base port addresses for the devices may be configured via the base
803 array module parameter.
806 tristate "IT87xx GPIO support"
808 Say yes here to support GPIO functionality of IT87xx Super I/O chips.
810 This driver is tested with ITE IT8728 and IT8732 Super I/O chips, and
811 supports the IT8761E, IT8613, IT8620E, and IT8628E Super I/O chips as
814 To compile this driver as a module, choose M here: the module will
818 tristate "Intel SCH/TunnelCreek/Centerton/Quark X1000 GPIO"
819 depends on (X86 || COMPILE_TEST) && PCI
823 Say yes here to support GPIO interface on Intel Poulsbo SCH,
824 Intel Tunnel Creek processor, Intel Centerton processor or
825 Intel Quark X1000 SoC.
827 The Intel SCH contains a total of 14 GPIO pins. Ten GPIOs are
828 powered by the core power rail and are turned off during sleep
829 modes (S3 and higher). The remaining four GPIOs are powered by
830 the Intel SCH suspend power supply. These GPIOs remain
831 active during S3. The suspend powered GPIOs can be used to wake the
832 system from the Suspend-to-RAM state.
834 The Intel Tunnel Creek processor has 5 GPIOs powered by the
835 core power rail and 9 from suspend power supply.
837 The Intel Centerton processor has a total of 30 GPIO pins.
838 Twenty-one are powered by the core power rail and 9 from the
839 suspend power supply.
841 The Intel Quark X1000 SoC has 2 GPIOs powered by the core
842 power well and 6 from the suspend power well.
845 tristate "SMSC SCH311x SuperI/O GPIO"
847 Driver to enable the GPIOs found on SMSC SMSC SCH3112, SCH3114 and
848 SCH3116 "Super I/O" chipsets.
850 To compile this driver as a module, choose M here: the module will
851 be called gpio-sch311x.
854 tristate "TS-5500 DIO blocks and compatibles"
855 depends on TS5500 || COMPILE_TEST
857 This driver supports Digital I/O exposed by pin blocks found on some
858 Technologic Systems platforms. It includes, but is not limited to, 3
859 blocks of the TS-5500: DIO1, DIO2 and the LCD port, and the TS-5600
863 tristate "Winbond Super I/O GPIO support"
866 This option enables support for GPIOs found on Winbond Super I/O
868 Currently, only W83627UHG (also known as Nuvoton NCT6627UD) is
871 You will need to provide a module parameter "gpios", or a
872 boot-time parameter "gpio_winbond.gpios" with a bitmask of GPIO
873 ports to enable (bit 0 is GPIO1, bit 1 is GPIO2, etc.).
875 To compile this driver as a module, choose M here: the module will
876 be called gpio-winbond.
879 tristate "WinSystems WS16C48 GPIO support"
881 select GPIOLIB_IRQCHIP
883 Enables GPIO support for the WinSystems WS16C48. The base port
884 addresses for the devices may be configured via the base module
885 parameter. The interrupt line numbers for the devices may be
886 configured via the irq module parameter.
890 menu "I2C GPIO expanders"
894 tristate "ADP5588 I2C GPIO expander"
896 This option enables support for 18 GPIOs found
897 on Analog Devices ADP5588 GPIO Expanders.
899 config GPIO_ADP5588_IRQ
900 bool "Interrupt controller support for ADP5588"
901 depends on GPIO_ADP5588=y
902 select GPIOLIB_IRQCHIP
904 Say yes here to enable the adp5588 to be used as an interrupt
905 controller. It requires the driver to be built in the kernel.
908 tristate "Avionic Design N-bit GPIO expander"
910 select GPIOLIB_IRQCHIP
912 This option enables support for N GPIOs found on Avionic Design
913 I2C GPIO expanders. The register space will be extended by powers
914 of two, so the controller will need to accommodate for that. For
915 example: if a controller provides 48 pins, 6 registers will be
916 enough to represent all pins, but the driver will assume a
917 register layout for 64 pins (8 registers).
920 tristate "Gateworks PLD GPIO Expander"
923 Say yes here to provide access to the Gateworks I2C PLD GPIO
924 Expander. This is used at least on the Cambria GW2358-4.
927 tristate "Maxim MAX7300 GPIO expander"
930 GPIO driver for Maxim MAX7300 I2C-based GPIO expander.
933 tristate "MAX7319, MAX7320-7327 I2C Port Expanders"
935 Say yes here to support the MAX7319, MAX7320-7327 series of I2C
936 Port Expanders. Each IO port on these chips has a fixed role of
937 Input (designated by 'I'), Push-Pull Output ('O'), or Open-Drain
938 Input and Output (designed by 'P'). The combinations are listed
941 8 bits: max7319 (8I), max7320 (8O), max7321 (8P),
942 max7322 (4I4O), max7323 (4P4O)
944 16 bits: max7324 (8I8O), max7325 (8P8O),
945 max7326 (4I12O), max7327 (4P12O)
947 Board setup code must specify the model to use, and the start
948 number for these GPIOs.
950 config GPIO_MAX732X_IRQ
951 bool "Interrupt controller support for MAX732x"
952 depends on GPIO_MAX732X=y
953 select GPIOLIB_IRQCHIP
955 Say yes here to enable the max732x to be used as an interrupt
956 controller. It requires the driver to be built in the kernel.
958 config GPIO_MC9S08DZ60
959 bool "MX35 3DS BOARD MC9S08DZ60 GPIO functions"
960 depends on I2C=y && MACH_MX35_3DS
962 Select this to enable the MC9S08DZ60 GPIO driver
965 tristate "PCA95[357]x, PCA9698, TCA64xx, and MAX7310 I/O ports"
968 Say yes here to provide access to several register-oriented
969 SMBus I/O expanders, made mostly by NXP or TI. Compatible
972 4 bits: pca9536, pca9537
974 8 bits: max7310, max7315, pca6107, pca9534, pca9538, pca9554,
975 pca9556, pca9557, pca9574, tca6408, tca9554, xra1202
977 16 bits: max7312, max7313, pca9535, pca9539, pca9555, pca9575,
982 40 bits: pca9505, pca9698
984 config GPIO_PCA953X_IRQ
985 bool "Interrupt controller support for PCA953x"
986 depends on GPIO_PCA953X
987 select GPIOLIB_IRQCHIP
989 Say yes here to enable the pca953x to be used as an interrupt
990 controller. It requires the driver to be built in the kernel.
993 tristate "PCA9570 4-Bit I2C GPO expander"
995 Say yes here to enable the GPO driver for the NXP PCA9570 chip.
997 To compile this driver as a module, choose M here: the module will
998 be called gpio-pca9570.
1001 tristate "PCF857x, PCA{85,96}7x, and MAX732[89] I2C GPIO expanders"
1002 select GPIOLIB_IRQCHIP
1005 Say yes here to provide access to most "quasi-bidirectional" I2C
1006 GPIO expanders used for additional digital outputs or inputs.
1007 Most of these parts are from NXP, though TI is a second source for
1008 some of them. Compatible models include:
1010 8 bits: pcf8574, pcf8574a, pca8574, pca8574a,
1011 pca9670, pca9672, pca9674, pca9674a,
1014 16 bits: pcf8575, pcf8575c, pca8575,
1015 pca9671, pca9673, pca9675
1017 Your board setup code will need to declare the expanders in
1018 use, and assign numbers to the GPIOs they expose. Those GPIOs
1019 can then be used from drivers and other kernel code, just like
1020 other GPIOs, but only accessible from task contexts.
1022 This driver provides an in-kernel interface to those GPIOs using
1023 platform-neutral GPIO calls.
1025 config GPIO_TPIC2810
1026 tristate "TPIC2810 8-Bit I2C GPO expander"
1028 Say yes here to enable the GPO driver for the TI TPIC2810 chip.
1030 To compile this driver as a module, choose M here: the module will
1031 be called gpio-tpic2810.
1034 tristate "Technologic Systems FPGA I2C GPIO"
1035 depends on SOC_IMX6 || COMPILE_TEST
1038 Say yes here to enabled the GPIO driver for Technologic's FPGA core.
1039 Series supported include TS-4100, TS-4900, TS-7970 and TS-7990.
1043 menu "MFD GPIO expanders"
1046 tristate "GPIO Support for ADP5520 PMIC"
1047 depends on PMIC_ADP5520
1049 This option enables support for on-chip GPIO found
1050 on Analog Devices ADP5520 PMICs.
1052 config GPIO_ALTERA_A10SR
1053 tristate "Altera Arria10 System Resource GPIO"
1054 depends on MFD_ALTERA_A10SR
1056 Driver for Arria10 Development Kit GPIO expansion which
1057 includes reads of pushbuttons and DIP switches as well
1061 tristate "Wolfson Microelectronics Arizona class devices"
1062 depends on MFD_ARIZONA
1064 Support for GPIOs on Wolfson Arizona class devices.
1067 tristate "ROHM BD70528 GPIO support"
1068 depends on MFD_ROHM_BD70528
1070 Support for GPIOs on ROHM BD70528 PMIC. There are four GPIOs
1071 available on the ROHM PMIC in total. The GPIOs can also
1072 generate interrupts.
1074 This driver can also be built as a module. If so, the module
1075 will be called gpio-bd70528.
1078 tristate "ROHM BD71828 GPIO support"
1079 depends on MFD_ROHM_BD71828
1081 Support for GPIOs on ROHM BD71828 PMIC. There are three GPIOs
1082 available on the ROHM PMIC in total. The GPIOs are limited to
1083 outputs only and pins must be configured to GPIO outputs by
1084 OTP. Enable this only if you want to use these pins as outputs.
1086 This driver can also be built as a module. If so, the module
1087 will be called gpio-bd71828.
1089 config GPIO_BD9571MWV
1090 tristate "ROHM BD9571 GPIO support"
1091 depends on MFD_BD9571MWV
1093 Support for GPIOs on ROHM BD9571 PMIC. There are two GPIOs
1094 available on the ROHM PMIC in total, both of which can also
1095 generate interrupts.
1097 This driver can also be built as a module. If so, the module
1098 will be called gpio-bd9571mwv.
1100 config GPIO_CRYSTAL_COVE
1101 tristate "GPIO support for Crystal Cove PMIC"
1102 depends on (X86 || COMPILE_TEST) && INTEL_SOC_PMIC
1103 select GPIOLIB_IRQCHIP
1105 Support for GPIO pins on Crystal Cove PMIC.
1107 Say Yes if you have a Intel SoC based tablet with Crystal Cove PMIC
1110 This driver can also be built as a module. If so, the module will be
1111 called gpio-crystalcove.
1114 tristate "AMD CS5535/CS5536 GPIO support"
1115 depends on X86 || MIPS || COMPILE_TEST
1116 depends on MFD_CS5535
1118 The AMD CS5535 and CS5536 southbridges support 28 GPIO pins that
1119 can be used for quite a number of things. The CS5535/6 is found on
1120 AMD Geode and Lemote Yeeloong devices.
1125 tristate "Dialog DA9052 GPIO"
1126 depends on PMIC_DA9052
1128 Say yes here to enable the GPIO driver for the DA9052 chip.
1131 tristate "Dialog Semiconductor DA9055 GPIO"
1132 depends on MFD_DA9055
1134 Say yes here to enable the GPIO driver for the DA9055 chip.
1136 The Dialog DA9055 PMIC chip has 3 GPIO pins that can be
1137 be controller by this driver.
1139 If driver is built as a module it will be called gpio-da9055.
1142 tristate "Diolan DLN2 GPIO support"
1144 select GPIOLIB_IRQCHIP
1147 Select this option to enable GPIO driver for the Diolan DLN2
1150 This driver can also be built as a module. If so, the module
1151 will be called gpio-dln2.
1154 bool "HTC EGPIO support"
1157 This driver supports the CPLD egpio chip present on
1158 several HTC phones. It provides basic support for input
1159 pins, output pins, and irqs.
1161 config GPIO_JANZ_TTL
1162 tristate "Janz VMOD-TTL Digital IO Module"
1163 depends on MFD_JANZ_CMODIO
1165 This enables support for the Janz VMOD-TTL Digital IO module.
1166 This driver provides support for driving the pins in output
1167 mode only. Input mode is not supported.
1170 tristate "Kontron ETX / COMexpress GPIO"
1171 depends on MFD_KEMPLD
1173 This enables support for the PLD GPIO interface on some Kontron ETX
1174 and COMexpress (ETXexpress) modules.
1176 This driver can also be built as a module. If so, the module will be
1180 tristate "TI/National Semiconductor LP3943 GPIO expander"
1181 depends on MFD_LP3943
1183 GPIO driver for LP3943 MFD.
1184 LP3943 can be used as a GPIO expander which provides up to 16 GPIOs.
1185 Open drain outputs are required for this usage.
1188 tristate "TI LP873X GPO"
1189 depends on MFD_TI_LP873X
1191 This driver supports the GPO on TI Lp873x PMICs. 2 GPOs are present
1194 This driver can also be built as a module. If so, the module will be
1198 tristate "TI LP87565 GPIO"
1199 depends on MFD_TI_LP87565
1201 This driver supports the GPIO on TI Lp873565 PMICs. 3 GPIOs are present
1204 This driver can also be built as a module. If so, the module will be
1205 called gpio-lp87565.
1208 tristate "Cirrus Logic Madera class codecs"
1209 depends on PINCTRL_MADERA
1211 Support for GPIOs on Cirrus Logic Madera class codecs.
1213 config GPIO_MAX77620
1214 tristate "GPIO support for PMIC MAX77620 and MAX20024"
1215 depends on MFD_MAX77620
1216 select GPIOLIB_IRQCHIP
1218 GPIO driver for MAX77620 and MAX20024 PMIC from Maxim Semiconductor.
1219 MAX77620 PMIC has 8 pins that can be configured as GPIOs. The
1220 driver also provides interrupt support for each of the gpios.
1221 Say yes here to enable the max77620 to be used as gpio controller.
1223 config GPIO_MAX77650
1224 tristate "Maxim MAX77650/77651 GPIO support"
1225 depends on MFD_MAX77650
1227 GPIO driver for MAX77650/77651 PMIC from Maxim Semiconductor.
1228 These chips have a single pin that can be configured as GPIO.
1231 bool "Intel MSIC mixed signal gpio support"
1232 depends on (X86 || COMPILE_TEST) && MFD_INTEL_MSIC
1234 Enable support for GPIO on intel MSIC controllers found in
1238 bool "TI PALMAS series PMICs GPIO"
1239 depends on MFD_PALMAS
1241 Select this option to enable GPIO driver for the TI PALMAS
1245 bool "RICOH RC5T583 GPIO"
1246 depends on MFD_RC5T583
1248 Select this option to enable GPIO driver for the Ricoh RC5T583
1250 This driver provides the support for driving/reading the gpio pins
1251 of RC5T583 device through standard gpio library.
1253 config GPIO_SL28CPLD
1254 tristate "Kontron sl28cpld GPIO support"
1255 depends on MFD_SL28CPLD || COMPILE_TEST
1257 select GPIOLIB_IRQCHIP
1260 This enables support for the GPIOs found on the Kontron sl28 CPLD.
1262 This driver can also be built as a module. If so, the module will be
1263 called gpio-sl28cpld.
1267 depends on MFD_STMPE
1269 select GPIOLIB_IRQCHIP
1271 This enables support for the GPIOs found on the STMPE I/O
1275 bool "TC3589X GPIOs"
1276 depends on MFD_TC3589X
1278 select GPIOLIB_IRQCHIP
1280 This enables support for the GPIOs found on the TC3589X
1283 config GPIO_TIMBERDALE
1284 bool "Support for timberdale GPIO IP"
1285 depends on MFD_TIMBERDALE
1287 Add support for the GPIO IP in the timberdale FPGA.
1289 config GPIO_TPS65086
1290 tristate "TI TPS65086 GPO"
1291 depends on MFD_TPS65086
1293 This driver supports the GPO on TI TPS65086x PMICs.
1295 config GPIO_TPS65218
1296 tristate "TPS65218 GPIO"
1297 depends on MFD_TPS65218
1299 Select this option to enable GPIO driver for the TPS65218
1302 config GPIO_TPS6586X
1303 bool "TPS6586X GPIO"
1304 depends on MFD_TPS6586X
1306 Select this option to enable GPIO driver for the TPS6586X
1309 config GPIO_TPS65910
1310 bool "TPS65910 GPIO"
1311 depends on MFD_TPS65910
1313 Select this option to enable GPIO driver for the TPS65910
1316 config GPIO_TPS65912
1317 tristate "TI TPS65912 GPIO"
1318 depends on MFD_TPS65912
1320 This driver supports TPS65912 gpio chip
1322 config GPIO_TPS68470
1323 bool "TPS68470 GPIO"
1324 depends on MFD_TPS68470
1326 Select this option to enable GPIO driver for the TPS68470
1328 There are 7 GPIOs and few sensor related GPIOs supported
1329 by the TPS68470. While the 7 GPIOs can be configured as
1330 input or output as appropriate, the sensor related GPIOs
1331 are "output only" GPIOs.
1333 This driver config is bool, as the GPIO functionality
1334 of the TPS68470 must be available before dependent
1338 tristate "TQ-Systems QTMX86 GPIO"
1339 depends on MFD_TQMX86 || COMPILE_TEST
1340 depends on HAS_IOPORT_MAP
1341 select GPIOLIB_IRQCHIP
1343 This driver supports GPIO on the TQMX86 IO controller.
1346 tristate "TWL4030, TWL5030, and TPS659x0 GPIOs"
1347 depends on TWL4030_CORE
1349 Say yes here to access the GPIO signals of various multi-function
1350 power management chips from Texas Instruments.
1353 tristate "TWL6040 GPO"
1354 depends on TWL6040_CORE
1356 Say yes here to access the GPO signals of twl6040
1357 audio chip from Texas Instruments.
1360 tristate "Philips UCB1400 GPIO"
1361 depends on UCB1400_CORE
1363 This enables support for the Philips UCB1400 GPIO pins.
1364 The UCB1400 is an AC97 audio codec.
1366 config GPIO_WHISKEY_COVE
1367 tristate "GPIO support for Whiskey Cove PMIC"
1368 depends on (X86 || COMPILE_TEST) && INTEL_SOC_PMIC_BXTWC
1369 select GPIOLIB_IRQCHIP
1371 Support for GPIO pins on Whiskey Cove PMIC.
1373 Say Yes if you have a Intel SoC based tablet with Whiskey Cove PMIC
1376 This driver can also be built as a module. If so, the module will be
1380 tristate "WM831x GPIOs"
1381 depends on MFD_WM831X
1383 Say yes here to access the GPIO signals of WM831x power management
1384 chips from Wolfson Microelectronics.
1387 tristate "WM8350 GPIOs"
1388 depends on MFD_WM8350
1390 Say yes here to access the GPIO signals of WM8350 power management
1391 chips from Wolfson Microelectronics.
1394 tristate "WM8994 GPIOs"
1395 depends on MFD_WM8994
1397 Say yes here to access the GPIO signals of WM8994 audio hub
1398 CODECs from Wolfson Microelectronics.
1402 menu "PCI GPIO expanders"
1406 tristate "AMD 8111 GPIO driver"
1407 depends on X86 || COMPILE_TEST
1408 depends on HAS_IOPORT_MAP
1410 The AMD 8111 south bridge contains 32 GPIO pins which can be used.
1412 Note, that usually system firmware/ACPI handles GPIO pins on their
1413 own and users might easily break their systems with uncarefull usage
1419 tristate "BT8XX GPIO abuser"
1420 depends on VIDEO_BT848=n
1422 The BT8xx frame grabber chip has 24 GPIO pins that can be abused
1423 as a cheap PCI GPIO card.
1425 This chip can be found on Miro, Hauppauge and STB TV-cards.
1427 The card needs to be physically altered for using it as a
1428 GPIO card. For more information on how to build a GPIO card
1429 from a BT8xx TV card, see the documentation file at
1430 Documentation/driver-api/gpio/bt8xxgpio.rst
1434 config GPIO_INTEL_MID
1435 bool "Intel MID GPIO support"
1436 depends on X86_INTEL_MID
1437 select GPIOLIB_IRQCHIP
1439 Say Y here to support Intel MID GPIO.
1441 config GPIO_MERRIFIELD
1442 tristate "Intel Merrifield GPIO support"
1443 depends on X86_INTEL_MID
1444 select GPIOLIB_IRQCHIP
1446 Say Y here to support Intel Merrifield GPIO.
1449 tristate "Mellanox BlueField SoC GPIO"
1450 depends on (MELLANOX_PLATFORM && ARM64 && ACPI) || (64BIT && COMPILE_TEST)
1453 Say Y here if you want GPIO support on Mellanox BlueField SoC.
1456 tristate "Mellanox BlueField 2 SoC GPIO"
1457 depends on (MELLANOX_PLATFORM && ARM64 && ACPI) || (64BIT && COMPILE_TEST)
1460 Say Y here if you want GPIO support on Mellanox BlueField 2 SoC.
1463 tristate "OKI SEMICONDUCTOR ML7213 IOH GPIO support"
1464 depends on X86 || COMPILE_TEST
1465 select GENERIC_IRQ_CHIP
1467 ML7213 is companion chip for Intel Atom E6xx series.
1468 This driver can be used for OKI SEMICONDUCTOR ML7213 IOH(Input/Output
1469 Hub) which is for IVI(In-Vehicle Infotainment) use.
1470 This driver can access the IOH's GPIO device.
1473 tristate "Intel EG20T PCH/LAPIS Semiconductor IOH(ML7223/ML7831) GPIO"
1474 depends on X86_32 || MIPS || COMPILE_TEST
1475 select GENERIC_IRQ_CHIP
1477 This driver is for PCH(Platform controller Hub) GPIO of Intel Topcliff
1478 which is an IOH(Input/Output Hub) for x86 embedded processor.
1479 This driver can access PCH GPIO device.
1481 This driver also can be used for LAPIS Semiconductor IOH(Input/
1482 Output Hub), ML7223 and ML7831.
1483 ML7223 IOH is for MP(Media Phone) use.
1484 ML7831 IOH is for general purpose use.
1485 ML7223/ML7831 is companion chip for Intel Atom E6xx series.
1486 ML7223/ML7831 is completely compatible for Intel EG20T PCH.
1488 config GPIO_PCI_IDIO_16
1489 tristate "ACCES PCI-IDIO-16 GPIO support"
1490 select GPIOLIB_IRQCHIP
1492 Enables GPIO support for the ACCES PCI-IDIO-16. An interrupt is
1493 generated when any of the inputs change state (low to high or high to
1494 low). Input filter control is not supported by this driver, and the
1495 input filters are deactivated by this driver.
1497 config GPIO_PCIE_IDIO_24
1498 tristate "ACCES PCIe-IDIO-24 GPIO support"
1499 select GPIOLIB_IRQCHIP
1501 Enables GPIO support for the ACCES PCIe-IDIO-24 family (PCIe-IDIO-24,
1502 PCIe-IDI-24, PCIe-IDO-24, PCIe-IDIO-12). An interrupt is generated
1503 when any of the inputs change state (low to high or high to low).
1504 Input filter control is not supported by this driver, and the input
1505 filters are deactivated by this driver.
1508 tristate "RDC R-321x GPIO support"
1512 Support for the RDC R321x SoC GPIOs over southbridge
1513 PCI configuration space.
1515 config GPIO_SODAVILLE
1516 bool "Intel Sodaville GPIO support"
1517 depends on X86 && OF
1519 select GENERIC_IRQ_CHIP
1521 Say Y here to support Intel Sodaville GPIO.
1525 menu "SPI GPIO expanders"
1526 depends on SPI_MASTER
1529 tristate "74x164 serial-in/parallel-out 8-bits shift register"
1532 Driver for 74x164 compatible serial-in/parallel-out 8-outputs
1533 shift registers. This driver can be used to provide access
1534 to more gpio outputs.
1536 config GPIO_MAX3191X
1537 tristate "Maxim MAX3191x industrial serializer"
1540 GPIO driver for Maxim MAX31910, MAX31911, MAX31912, MAX31913,
1541 MAX31953 and MAX31963 industrial serializer, a daisy-chainable
1542 chip to make 8 digital 24V inputs available via SPI. Supports
1543 CRC checksums to guard against electromagnetic interference,
1544 as well as undervoltage and overtemperature detection.
1547 tristate "Maxim MAX7301 GPIO expander"
1550 GPIO driver for Maxim MAX7301 SPI-based GPIO expander.
1553 tristate "Freescale MC33880 high-side/low-side switch"
1555 SPI driver for Freescale MC33880 high-side/low-side switch.
1556 This provides GPIO interface supporting inputs and outputs.
1559 tristate "Generic parallel-in/serial-out shift register"
1561 GPIO driver for SPI compatible parallel-in/serial-out shift
1562 registers. These are input only devices.
1565 tristate "EXAR XRA1403 16-bit GPIO expander"
1568 GPIO driver for EXAR XRA1403 16-bit SPI-based GPIO expander.
1571 tristate "Turris Mox Moxtet bus GPIO expander"
1574 Say yes here if you are building for the Turris Mox router.
1575 This is the driver needed for configuring the GPIOs via the Moxtet
1576 bus. For example the Mox module with SFP cage needs this driver
1577 so that phylink can use corresponding GPIOs.
1581 menu "USB GPIO expanders"
1584 config GPIO_VIPERBOARD
1585 tristate "Viperboard GPIO a & b support"
1586 depends on MFD_VIPERBOARD
1588 Say yes here to access the GPIO signals of Nano River
1589 Technologies Viperboard. There are two GPIO chips on the
1590 board: gpioa and gpiob.
1591 See viperboard API specification and Nano
1592 River Tech's viperboard.h for detailed meaning
1593 of the module parameters.
1597 config GPIO_AGGREGATOR
1598 tristate "GPIO Aggregator"
1600 Say yes here to enable the GPIO Aggregator, which provides a way to
1601 aggregate existing GPIO lines into a new virtual GPIO chip.
1602 This can serve the following purposes:
1603 - Assign permissions for a collection of GPIO lines to a user,
1604 - Export a collection of GPIO lines to a virtual machine,
1605 - Provide a generic driver for a GPIO-operated device in an
1606 industrial control context, to be operated from userspace using
1607 the GPIO chardev interface.
1610 tristate "GPIO Testing Driver"
1613 This enables GPIO Testing driver, which provides a way to test GPIO
1614 subsystem through sysfs(or char device) and debugfs. GPIO_SYSFS
1615 must be selected for this test.
1616 User could use it through the script in
1617 tools/testing/selftests/gpio/gpio-mockup.sh. Reference the usage in