[PATCH 05/33] gpio: add generic single-register fixed-direction GPIO driver

[Linus Walleij]

On Thu, Sep 8, 2016 at 3:21 PM, Linus Walleij <linus.walleij at linaro.org> wrote:
> On Mon, Sep 5, 2016 at 2:26 PM, Russell King - ARM Linux
> <linux at armlinux.org.uk> wrote:
>> On Mon, Sep 05, 2016 at 11:06:28AM +0200, Linus Walleij wrote:
>>> I couldn't resist testing on the Compaq iPAQ h3600. It works the
>>> same as before so:
>>> Tested-by: Linus Walleij <linus.walleij at linaro.org> [for Compaq iPAQ H3600]
>>
>> Great news.  I've been thinking about digging out my h3600, but it's
>> very old, and hasn't been turned on for many years.  I'm not sure what
>> state it's in.
>>
>> I've been hoping to try booting some kernels with qemu-system-arm, but
>> so far I've completely failed to get qemu-system-arm to do anything
>> useful - it just sits there doing apparently nothing, irrespective of
>> which platform I choose or which kernel I give it.
>>
>>> The only news in the bootlog is this:
>>> sa11x0-pcmcia: probe of sa11x0-pcmcia failed with error -2
>>
>> Not so great news - that's -ENOENT.  Did that happen before these
>> changes?  That could be that the gpiod lookup table isn't found.
>> However, if that were the case, I'd have expected an error message
>> along the lines of:
>>
>> Failed to get GPIO for xxx: -nnn
>>
>> from soc_pcmcia_request_gpiods().  The other possibility is that
>> we're not getting to sa11x0_drv_pcmcia_legacy_probe() but instead
>> trying to initialise it as a generic sa11x0 socket, and
>> sa11x0_pcmcia_hw_init() is failing as a result.
>>
>> We should be using the legacy probe on H3600, so sa11x0_pcmcia_hw_init()
>> should never be reached.
>
> However that is what happens, this is my callstack after
> adding some prints:
>
> sa11x0_pcmcia_init
> sa11x0_drv_pcmcia_probe
> soc_pcmcia_init_one
> soc_pcmcia_add_one
> soc_pcmcia_hw_init
> sa11x0_pcmcia_hw_init
> soc_pcmcia_add_one: pcmcia HW init failed
> sa11x0-pcmcia: probe of sa11x0-pcmcia failed with error -2

Bah I found the cause, just a simple oneliner typo in one of
the patches. I will comment on the patch in question so you can
fix it up on your branch.

Yours,
Linus Walleij