[PATCH 2/3] [v8] pinctrl: qcom: disable GPIO groups with no pins

[Stephen Boyd]

On 12/13, Timur Tabi wrote:
> pinctrl-msm only accepts an array of GPIOs from 0 to n-1, and it expects
> each group to support have only one pin (npins == 1).
> 
> We can support "sparse" GPIO maps if we allow for some groups to have zero
> pins (npins == 0).  These pins are "hidden" from the rest of the driver
> and gpiolib.
> 
> Access to unavailable GPIOs is blocked via a request callback.  If the
> requested GPIO is unavailable, -EACCES is returned, which prevents
> further access to that GPIO.
> 
> Signed-off-by: Timur Tabi <timur at codeaurora.org>
> ---

Reviewed-by: Stephen Boyd <sboyd at codeaurora.org>

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