[PATCH 1/5] regulator: Add ena_gpio_valid config

[Mark Brown]

On Mon, Oct 06, 2014 at 10:17:11PM +0200, Markus Pargmann wrote:
> Most drivers do not set the ena_gpio field of struct regulator_config
> before passing it to the regulator core. This is fine as long as the
> gpio identifier that is passed is a positive integer. But the gpio
> identifier 0 is also valid. So we are not able to decide wether we got a
> real gpio identifier or not.
> 
> To be able to decide if it is a valid gpio that got passed, this patch
> adds a ena_gpio_valid field that should be set if ena_gpio is a valid
> gpio and should be used. It is a preperation patch for multiple patches
> that adapt the drivers and fix the regulator core checks for this field.

This should be part of the patch adding meaningful behaviour for the
flag, it's pointless separately.
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