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Linus Walleij ff2b135922 gpio: make the gpiochip a real device 
GPIO chips have been around for years, but were never real devices,
instead they were piggy-backing on a parent device (such as a
platform_device or amba_device) but this was always optional.
GPIO chips could also exist without any device at all, with its
struct device *parent (ex *dev) pointer being set to null.

When sysfs was in use, a mock device would be created, with the
optional parent assigned, or just floating orphaned with NULL
as parent.

If sysfs is active, it will use this device as parent.

We now create a gpio_device struct containing a real
struct device and move the subsystem over to using that. The
list of struct gpio_chip:s is augmented to hold struct
gpio_device:s and we find gpio_chips:s by first looking up
the struct gpio_device.

The struct gpio_device is designed to stay around even if the
gpio_chip is removed, so as to satisfy users in userspace
that need a backing data structure to hold the state of the
session initiated with e.g. a character device even if there is
no physical chip anymore.

From this point on, gpiochips are devices.

Cc: Johan Hovold <johan@kernel.org>
Cc: Michael Welling <mwelling@ieee.org>
Cc: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
 		2016-02-09 11:03:53 +01:00
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accessibility
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acpi tree wide: use kvfree() than conditional kfree()/vfree() 2016-01-22 17:02:18 -08:00
amba
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android
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ata Merge branch 'for-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2016-01-11 19:33:59 -08:00
atm
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auxdisplay
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base wrappers for ->i_mutex access 2016-01-22 18:04:28 -05:00
bcma GPIO bulk updates for the v4.5 kernel cycle: 2016-01-17 12:32:01 -08:00
block Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client 2016-01-24 12:34:13 -08:00
bluetooth Bluetooth: btmrvl: don't send data to firmware while processing suspend 2016-01-06 16:37:14 +01:00
bus ARM: SoC driver updates for v4.5 2016-01-20 18:42:30 -08:00
cdrom cdrom: don't open-code memdup_user() 2016-01-06 08:25:24 -05:00
char Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-01-23 12:24:56 -08:00
clk ARM: DT updates for v4.5 2016-01-20 18:16:29 -08:00
clocksource ARM: SoC cleanups for v4.5 2016-01-20 17:55:20 -08:00
connector
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cpufreq powerpc updates for 4.5 2016-01-15 13:18:47 -08:00
cpuidle More power management and ACPI updates for v4.5-rc1 2016-01-20 19:06:49 -08:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2016-01-22 11:58:43 -08:00
dca
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devfreq PM / devfreq: Do not show statistics if it's not ready. 2016-01-13 17:30:33 +09:00
dio
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dma dmaengine fixes for 4.5-rc1 2016-01-20 10:15:21 -08:00
dma-buf
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edac
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eisa
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extcon
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firewire
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firmware UBSAN: run-time undefined behavior sanity checker 2016-01-20 17:09:18 -08:00
fmc
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fpga
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gpio gpio: make the gpiochip a real device 2016-02-09 11:03:53 +01:00
gpu tree wide: use kvfree() than conditional kfree()/vfree() 2016-01-22 17:02:18 -08:00
hid asm-generic changes for 4.5 2016-01-20 17:30:20 -08:00
hsi HSI: omap_ssi_port: fix handling of_get_named_gpio result 2016-01-07 16:07:54 +01:00
hv char/misc patches for 4.5-rc1 2016-01-13 10:23:36 -08:00
hwmon Merge git://www.linux-watchdog.org/linux-watchdog 2016-01-17 12:15:38 -08:00
hwspinlock
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hwtracing
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i2c Merge branch 'i2c/for-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2016-01-14 11:25:37 -08:00
ide drivers/ide: make ide-scan-pci.c driver explicitly non-modular 2016-01-18 14:12:33 -05:00
idle
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iio Merge branch 'akpm' (patches from Andrew) 2016-01-21 12:32:08 -08:00
infiniband Initial roundup of 4.5 merge window patches 2016-01-23 18:45:06 -08:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2016-01-22 17:20:30 -08:00
iommu IOMMU Updates for Linux v4.5 2016-01-19 09:35:06 -08:00
ipack
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irqchip Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2016-01-24 12:50:56 -08:00
isdn Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-01-11 23:55:43 -05:00
leds GPIO bulk updates for the v4.5 kernel cycle: 2016-01-17 12:32:01 -08:00
lguest lguest: Map switcher text R/O 2016-01-12 12:17:28 +01:00
lightnvm lightnvm: introduce factory reset 2016-01-12 08:21:18 -07:00
macintosh
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mailbox
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mcb
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md Merge branch 'for-4.5/drivers' of git://git.kernel.dk/linux-block 2016-01-21 18:19:38 -08:00
media dma-mapping: always provide the dma_map_ops based implementation 2016-01-20 17:09:18 -08:00
memory ARM: SoC driver updates for v4.5 2016-01-20 18:42:30 -08:00
memstick memstick: use sector_div instead of do_div 2016-01-20 17:09:18 -08:00
message
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mfd GPIO bulk updates for the v4.5 kernel cycle: 2016-01-17 12:32:01 -08:00
misc Merge branch 'akpm' (patches from Andrew) 2016-01-21 12:32:08 -08:00
mmc MMC core: 2016-01-22 12:04:21 -08:00
mtd Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2016-01-24 12:50:56 -08:00
net Initial roundup of 4.5 merge window patches 2016-01-23 18:45:06 -08:00
nfc
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ntb NTB: Fix macro parameter conflict with field name 2016-01-21 19:53:10 -05:00
nubus
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nvdimm mm, dax, pmem: introduce {get|put}_dev_pagemap() for dax-gup 2016-01-15 17:56:32 -08:00
nvme Merge branch 'for-4.5/nvme' of git://git.kernel.dk/linux-block 2016-01-21 19:58:02 -08:00
nvmem
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of DeviceTree updates for 4.5: 2016-01-14 11:13:28 -08:00
oprofile wrappers for ->i_mutex access 2016-01-22 18:04:28 -05:00
parisc parisc: convert to dma_map_ops 2016-01-20 17:09:18 -08:00
parport
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pci PCI changes for the v4.5 merge window: 2016-01-21 11:52:16 -08:00
pcmcia
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perf
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phy
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pinctrl GPIO bulk updates for the v4.5 kernel cycle: 2016-01-17 12:32:01 -08:00
platform ideapad-laptop: Add Lenovo Yoga 700 to no_hw_rfkill dmi list 2016-01-24 10:15:01 -08:00
pnp
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power power: bq27xxx_battery: Fix bq27541 AveragePower register address 2016-01-14 01:03:18 +01:00
powercap Merge branch 'powercap' 2016-01-12 01:12:40 +01:00
pps
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ps3
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ptp
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pwm pwm: Mark all devices as "might sleep" 2016-01-21 15:04:59 +01:00
rapidio rapidio: use kobj_to_dev() 2016-01-20 17:09:18 -08:00
ras
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regulator regulator: Update for v4.5 2016-01-15 12:14:47 -08:00
remoteproc virtio: make find_vqs() checkpatch.pl-friendly 2016-01-12 20:47:06 +02:00
reset
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rpmsg virtio: make find_vqs() checkpatch.pl-friendly 2016-01-12 20:47:06 +02:00
rtc RTC for 4.5 2016-01-18 12:10:45 -08:00
s390 virtio: barrier rework+fixes 2016-01-18 16:44:24 -08:00
sbus
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scsi Initial roundup of 4.5 merge window patches 2016-01-23 18:45:06 -08:00
sfi
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sh
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sn
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soc ARM: SoC support for Tegra platforms for v4.5 2016-01-22 17:30:52 -08:00
spi powerpc updates for 4.5 2016-01-15 13:18:47 -08:00
spmi
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ssb
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staging Initial roundup of 4.5 merge window patches 2016-01-23 18:45:06 -08:00
target Merge branch 'for-4.5/nvme' of git://git.kernel.dk/linux-block 2016-01-21 19:58:02 -08:00
tc
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thermal Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2016-01-24 12:43:06 -08:00
thunderbolt
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tty ARM: SoC driver updates for v4.5 2016-01-20 18:42:30 -08:00
uio
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usb Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-01-23 12:24:56 -08:00
uwb
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vfio
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vhost
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video wrappers for ->i_mutex access 2016-01-22 18:04:28 -05:00
virt
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virtio virtio: make find_vqs() checkpatch.pl-friendly 2016-01-12 20:47:06 +02:00
vlynq
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vme
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w1
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watchdog watchdog: asm9260: remove __init and __exit annotations 2016-01-11 22:48:05 +01:00
xen virtio: barrier rework+fixes 2016-01-18 16:44:24 -08:00
zorro
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Kconfig
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Makefile
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