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If both legacy and device-tree machines are mixed in the same defconfig,
the legacy boards don't boot up anymore with gpio request deferral
errors.
This is seen when attempting to run akita, borzoi, spitz, terrier, or
tosa in qemu with pxa_defconfig.
The real reason behind is that gpio handling for pxa in its current
state cannot be built for _both_ a devicetree machine (ie. pxa-dt.c) and
a non devicetree machine (ie. corgi, tosa, ...).
This is turn is because for devicetree a pinctrl is enforced for the
machine, and a pinctrl driver is required. If it's not available,
pxa_gpio_request() fails on pinctrl_request_gpio() and returns
-EPROBE_DEFER. It was introduced by commit f806dac5938b
("ARM: pxa: activate pinctrl for device-tree machines").
Now the true chicken and egg problem is than machine files,
ie. arch/arm/mach-pxa/xxx.c are using gpio before the drivers are
probed, in the init_machine() function, and that's why pinctrl/gpio for
legacy machine files is a bit difficult.
As for now, to keep the compilation coverage and testing of legacy
machines, this patch removes the 2 devicetree machines from
pxa_defconfig.
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Tested-by: Guenter Roeck <linux@roeck-us.net>
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Add a defconfig covering all known pxa board, ie. all selectable machine
files in arch/arm/mach-pxa/*.c.
This defconfig was built by doing :
- aggregation of all known defconfigs by cat
am200epdkit_defconfig
cm_x2xx_defconfig
cm_x300_defconfig
colibri_pxa270_defconfig
colibri_pxa300_defconfig
corgi_defconfig
em_x270_defconfig
eseries_pxa_defconfig
ezx_defconfig
h5000_defconfig
imote2_defconfig
lpd270_defconfig
lubbock_defconfig
magician_defconfig
mainstone_defconfig
multi_v7_defconfig
palmz72_defconfig
pcm027_defconfig
pxa255-idp_defconfig
pxa3xx_defconfig
raumfeld_defconfig
spitz_defconfig
trizeps4_defconfig
viper_defconfig
xcep_defconfig
zeus_defconfig
- manual make menuconfig to ensure :
- all pxa implementation were selected
- all drivers were transformed into modules rather than builtin
=> as a consequence this single kernel will rely on an initramfs
=> as kernel size matters on pxa, each machine can take the subset
of modules required for it to work
- all missed configurations are selected verified by :
=> grep -i pxa .config | grep "is not set"
=> this should only show the left on purpose options (either not
selectable or sharpsl exception below)
- CONFIG_PXA_SHARPSL was disabled
This breaks the boot very early on any non Sharp platform, see
head-sharpsl.S
This defconfig was tested as booting up to the login phase on :
- lubbock (pxa25x)
- mainstone (pxa27x)
- zylonite (pxa3xx)
The completion of this work will require to :
- parse manually all the arch/arm/mach-pxa/*c files, look for all
platform devices added, and verify they are all in pxa_defconfig
- do the same to ensure all pxa specific drivers (leds, gpio, ...) are
included
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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