Thierry Reding 29a1f2333e gpio: Add helpers for optional GPIOs ...

Introduce gpiod_get_optional() and gpiod_get_index_optional() helpers
that make it easier for drivers to handle optional GPIOs.

Currently in order to handle optional GPIOs, a driver needs to special
case error handling for -ENOENT, such as this:

	gpio = gpiod_get(dev, "foo");
	if (IS_ERR(gpio)) {
		if (PTR_ERR(gpio) != -ENOENT)
			return PTR_ERR(gpio);

		gpio = NULL;
	}

	if (gpio) {
		/* set up GPIO */
	}

With these new helpers the above is reduced to:

	gpio = gpiod_get_optional(dev, "foo");
	if (IS_ERR(gpio))
		return PTR_ERR(gpio);

	if (gpio) {
		/* set up GPIO */
	}

While at it, device-managed variants of these functions are also
provided.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

2014-05-09 13:48:30 +02:00

..

devres.c

gpio: Add helpers for optional GPIOs

2014-05-09 13:48:30 +02:00

gpio-74x164.c

gpio: 74x164: Driver cleanup

2013-12-12 14:28:12 +01:00

gpio-adnp.c

gpio: switch drivers to use new callback

2014-03-18 09:28:30 +01:00

gpio-adp5520.c

gpio: adp5520: remove unnecessary OOM messages

2014-05-09 10:54:33 +02:00

gpio-adp5588.c

gpio: adp5588: remove unnecessary OOM messages

2014-05-09 10:54:37 +02:00

gpio-amd8111.c

gpio: remove DEFINE_PCI_DEVICE_TABLE macro

2013-12-03 13:16:09 +01:00

gpio-arizona.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-bcm-kona.c

gpio: switch drivers to use new callback

2014-03-18 09:28:30 +01:00

gpio-bt8xx.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-clps711x.c

Linux 3.14-rc6

2014-03-14 10:26:45 +01:00

gpio-cs5535.c

…

gpio-da9052.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-da9055.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-davinci.c

gpio: davinci: remove unnecessary OOM messages

2014-05-09 10:54:39 +02:00

gpio-dwapb.c

gpio: dwapb: drop irq_setup_generic_chip()

2014-04-28 12:35:08 -07:00

gpio-em.c

gpio: em: remove unnecessary OOM messages

2014-05-09 10:54:44 +02:00

gpio-ep93xx.c

…

gpio-f7188x.c

gpio: f7188x: set can_sleep attribute

2014-01-07 19:02:01 +01:00

gpio-ge.c

gpio: ge: Convert to platform driver

2014-04-28 12:35:09 -07:00

gpio-generic.c

gpio: generic: Use platform_device_id->driver_data field for driver flags

2014-03-18 09:28:31 +01:00

gpio-grgpio.c

gpio: grgpio: Make of_device_id array const

2014-05-09 10:57:36 +02:00

gpio-ich.c

gpio: ich: Add support for Intel Avoton

2014-03-19 08:58:23 +00:00

gpio-intel-mid.c

gpio: switch drivers to use new callback

2014-03-18 09:28:30 +01:00

gpio-iop.c

gpio: iop: fix devm_ioremap_resource() return value checking

2014-03-26 10:31:34 +01:00

gpio-it8761e.c

…

gpio-janz-ttl.c

gpio: janz-ttl: remove unnecessary OOM messages

2014-05-09 10:54:48 +02:00

gpio-kempld.c

gpio: kempld: use BIT() macro instead of shifting bits

2014-05-03 12:16:07 -07:00

gpio-ks8695.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-lp3943.c

gpio: lp3943: Remove redundant of_match_ptr helper

2014-01-21 08:29:00 +00:00

gpio-lpc32xx.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-lynxpoint.c

gpio: lynxpoint: remove unnecessary OOM messages

2014-05-09 10:54:52 +02:00

gpio-max730x.c

gpio: max730x: Remove kfree(ts) in __max730x_remove()

2014-04-28 12:35:09 -07:00

gpio-max732x.c

gpio: max732x: Fix possible NULL pointer dereference on i2c_new_dummy error

2014-03-12 14:50:51 +01:00

gpio-max7300.c

…

gpio-max7301.c

…

gpio-mc9s08dz60.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-mc33880.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-mcp23s08.c

gpio: mcp23s08: Make of_device_id array const

2014-05-09 10:59:29 +02:00

gpio-ml-ioh.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-mm-lantiq.c

…

gpio-moxart.c

gpio: moxart: remove unnecessary OOM messages

2014-05-09 10:54:56 +02:00

gpio-mpc8xxx.c

powerpc/gpio: Fix the wrong GPIO input data on MPC8572/MPC8536

2013-12-03 13:10:48 +01:00

gpio-mpc5200.c

…

gpio-msic.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-msm-v1.c

…

gpio-msm-v2.c

GPIO tree bulk changes for v3.14

2014-01-21 10:09:12 -08:00

gpio-mvebu.c

gpio: mvebu: Remove initcall-based driver initialization

2014-05-09 11:08:11 +02:00

gpio-mxc.c

gpio: mxc: Do not hard code return value

2014-01-02 13:55:53 +01:00

gpio-mxs.c

gpio: mxs: Allow for recursive enable_irq_wake() call

2014-03-27 10:11:59 +01:00

gpio-octeon.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-omap.c

gpio: omap: use BIT() macro instead of shifting bits

2014-05-03 12:16:16 -07:00

gpio-palmas.c

gpio: palmas: Make of_device_id array const

2014-05-09 11:01:24 +02:00

gpio-pca953x.c

gpio: pca953x: request a shared interrupt

2014-05-09 12:58:12 +02:00

gpio-pcf857x.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-pch.c

pch_gpio: set value before enabling output direction

2014-03-27 10:20:29 +01:00

gpio-pl061.c

gpio: pl061: use BIT() macro instead of shifting bits

2014-05-03 12:16:24 -07:00

gpio-pxa.c

gpio: pxa: clamp gpio get value to [0,1]

2014-01-15 08:56:20 +01:00

gpio-rc5t583.c

gpio: rc5t583: remove unnecessary OOM messages

2014-05-09 10:55:08 +02:00

gpio-rcar.c

gpio: rcar: remove unnecessary OOM messages

2014-05-09 10:55:11 +02:00

gpio-rdc321x.c

gpio: rdc321x: remove unnecessary OOM messages

2014-05-09 10:55:15 +02:00

gpio-sa1100.c

…

gpio-samsung.c

gpio: samsung: Add missing "break" statement

2014-03-27 10:08:59 +01:00

gpio-sch311x.c

gpio: sch311x: Slightly refactor sch311x_detect for better readability

2014-04-28 12:35:09 -07:00

gpio-sch.c

gpio-sch: set output level after configuration of direction

2014-04-28 12:35:08 -07:00

gpio-sodaville.c

gpio: sodaville: fix some error return code on error path

2013-12-20 10:23:18 +01:00

gpio-spear-spics.c

gpio: SPEAr: remove unnecessary OOM messages

2014-05-09 10:55:19 +02:00

gpio-sta2x11.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-stmpe.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-stp-xway.c

…

gpio-sx150x.c

gpio: pl061/sx150x: Remove unneeded include of linux/workqueue.h

2014-04-28 12:35:09 -07:00

gpio-syscon.c

gpio: Driver for SYSCON-based GPIOs

2014-03-18 09:28:31 +01:00

gpio-tb10x.c

gpio: tb10x: Remove redundant of_match_ptr helper

2014-01-02 14:03:22 +01:00

gpio-tc3589x.c

gpio: tc3589x: use gpiolib irqchip helpers

2014-04-28 12:35:07 -07:00

gpio-tegra.c

gpio: tegra: Make of_device_id array const

2014-05-09 11:01:53 +02:00

gpio-timberdale.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-tps6586x.c

gpio: tps6586x: remove unnecessary OOM messages

2014-05-09 10:55:27 +02:00

gpio-tps65910.c

gpio: tps65910: remove unnecessary OOM messages

2014-05-09 10:55:31 +02:00

gpio-tps65912.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-ts5500.c

…

gpio-twl4030.c

gpio: twl4030: Remove redundant assignment

2014-03-27 10:06:34 +01:00

gpio-twl6040.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-tz1090-pdc.c

…

gpio-tz1090.c

gpio-tz1090: Replace commas with semi-colons

2014-03-07 11:57:00 +08:00

gpio-ucb1400.c

Linux 3.13-rc3

2013-12-09 14:04:37 +01:00

gpio-viperboard.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-vr41xx.c

MIPS: VR41xx: Mark GPIO lines used for IRQ

2014-03-31 18:17:12 +02:00

gpio-vx855.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-wm831x.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-wm8350.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-wm8994.c

gpio/pinctrl: make gpio_chip members typed boolean

2013-12-04 14:42:46 +01:00

gpio-xilinx.c

gpio: xilinx: Make of_device_id array const

2014-05-09 11:03:03 +02:00

gpio-xtensa.c

gpio: xtensa: fix build when XCHAL_HAVE_CP is 0

2014-02-03 09:11:45 +01:00

gpio-zevio.c

gpio: zevio: Make of_device_id array const

2014-05-09 11:04:08 +02:00

gpiolib-acpi.c

gpio / ACPI: Prevent potential wrap of GPIO value on OpRegion read

2014-04-14 10:22:36 +02:00

gpiolib-of.c

gpiolib: of: remove gpio_to_desc() usage

2014-04-28 12:35:09 -07:00

gpiolib.c

gpio: Add helpers for optional GPIOs

2014-05-09 13:48:30 +02:00

gpiolib.h

gpiolib: Allow GPIO chips to request their own GPIOs

2014-03-13 10:32:18 +01:00

Kconfig

gpio: always enable GPIO_OMAP on ARCH_OMAP

2014-05-09 09:46:32 +02:00

Makefile

gpio: omap: add a GPIO_OMAP option instead of using ARCH_OMAP

2014-04-28 12:35:08 -07:00