linux-kernel - Re: [PATCH 1/3] Input: add STMicroelectronics FingerTip touchscreen driver

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Date:   Wed, 18 Jan 2017 10:16:39 +0900
From:   Andi Shyti <andi.shyti@...sung.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Krzysztof Kozlowski <krzk@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Javier Martinez Canillas <javier@....samsung.com>,
        linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        Andi Shyti <andi@...zian.org>
Subject: Re: [PATCH 1/3] Input: add STMicroelectronics FingerTip touchscreen
 driver

Hi Dmitry,

> > > +- ledvdd-supply		: power supply to the touch key leds
> > 
> > Is this really optional? If yes... how it gets the power when not
> > provided?
> 
> Also, is this really a regulator? Given you are testing whether it is on
> or off to report LED state it feels to me it might be a GPIO pin, not
> regulator...

In this case it's a real regulator, not a GPIO. But even if it
was a GPIO, I still could use gpio-regulator[*] which handles
gpio using the regulator framework. In this case, depending on
how the leds are enabled on the DTS, in the driver I would use
only one api (regulators indeed) for both the cases.

Thanks,
Andi

[*] Documentation/devicetree/bindings/regulator/gpio-regulator.txt