[PATCH] pinctrl: qcom: add get_direction function

[Timur Tabi]

Stephen Boyd wrote:
> I don't see any problem with failing msm_gpio_set() when the
> function is "not gpio", but I also wonder why it matters. Drivers
> shouldn't be doing that, because if the gpio is muxed to some
> other functionality they shouldn't be treating it as a gpio in
> the first place.

The idea is to notify drivers with an error code when they make a mistake. 
Perhaps the device tree or the ACPI table has an error?

> Perhaps we can have some sort of gpio validation debug option
> that the check goes under. Then we could fail and print a big
> warning if this happens, but if we aren't debugging then we don't
> do any checking and rely on drivers to do the right thing.

I could add that, but I still think returning an error code is appropriate.  On 
the TLMM, we know for sure that the pin must be set to function 0 in order for 
the read/write routines to operate correctly.

I guess I should propose a patch and we can vote on it.

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