arm:collie_defconfig broken since commit ff2b135922 ("gpio: make the gpiochip a real device")

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Hi,

arm:collie_defconfig is broken since commit ff2b135922 ("gpio: make the gpiochip a real device").

Test is quite simple:

Build arm:collie_defconfig, run with
	qemu-system-arm -M collie -kernel arch/arm/boot/zImage --append "console=ttySA1" -monitor null -nographic

Prior to the above commit, there is console output (the image crashes because it
doesn't have a root file system, but that is irrelevant). After the commit, the
console is silent.

Let me know if I can do anything to help tracking down the problem.

Thanks,
Guenter

---
Bisect log:

# bad: [f55532a0c0b8bb6148f4e07853b876ef73bc69ca] Linux 4.6-rc1
# good: [b562e44f507e863c6792946e4e1b1449fbbac85d] Linux 4.5
git bisect start 'HEAD' 'v4.5'
# bad: [6b5f04b6cf8ebab9a65d9c0026c650bb2538fd0f] Merge branch 'for-4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
git bisect bad 6b5f04b6cf8ebab9a65d9c0026c650bb2538fd0f
# good: [96b9b1c95660d4bc5510c5d798d3817ae9f0b391] Merge tag 'tty-4.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
git bisect good 96b9b1c95660d4bc5510c5d798d3817ae9f0b391
# good: [18f038e6bfb715310526ac05e4f20e55683471de] staging: dgnc: cleanup properly
git bisect good 18f038e6bfb715310526ac05e4f20e55683471de
# bad: [10fdfee7f7fd8d4a6a8455ac4c9fbbc51d79b9f7] Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
git bisect bad 10fdfee7f7fd8d4a6a8455ac4c9fbbc51d79b9f7
# good: [3d15cfdb1b77536c205d8e49c0312219ddf162ec] Merge tag 'linux-kselftest-4.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest
git bisect good 3d15cfdb1b77536c205d8e49c0312219ddf162ec
# bad: [ccbd805aa934dd1b863ef115a9c55f119b2388cf] Revert "Share upstreaming patches"
git bisect bad ccbd805aa934dd1b863ef115a9c55f119b2388cf
# bad: [db303a9053c8a81717cb6497f4cf63b773b21ca8] gpio: arizona: Use devm_gpiochip_add_data() for gpio registration
git bisect bad db303a9053c8a81717cb6497f4cf63b773b21ca8
# bad: [ed07247dbf5b0a23b0289c9e8e4a2ceb9b8f2e9d] gpio: Remove unused asm/gpio.h files
git bisect bad ed07247dbf5b0a23b0289c9e8e4a2ceb9b8f2e9d
# bad: [2f890cf0dfe421ecd2095d8cabb89e7207b499ee] gpio: ath79: Make the driver removable
git bisect bad 2f890cf0dfe421ecd2095d8cabb89e7207b499ee
# good: [daec0beda6fd7a741e4381741b3f7ff15970fdf6] Merge branch 'error-return-from-get' into devel
git bisect good daec0beda6fd7a741e4381741b3f7ff15970fdf6
# bad: [40c159b776f882f2e2cbe20c9e29832841e5c0f9] gpio: add a userspace character device ABI
git bisect bad 40c159b776f882f2e2cbe20c9e29832841e5c0f9
# bad: [34ffd85d9c46cde3dc987cac82bff370a937ac4b] gpio: refer to gpio device in prints and debugfs
git bisect bad 34ffd85d9c46cde3dc987cac82bff370a937ac4b
# bad: [ff2b1359229927563addbf2f5ad480660c350903] gpio: make the gpiochip a real device
git bisect bad ff2b1359229927563addbf2f5ad480660c350903
# first bad commit: [ff2b1359229927563addbf2f5ad480660c350903] gpio: make the gpiochip a real device
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