linux-kernel - Re: [PATCH 3/4] Input: pwm-vibra

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Date:   Tue, 02 May 2023 17:35:04 +0200
From:   Luca Weiss <luca@...tu.xyz>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Sebastian Reichel <sre@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Brian Masney <masneyb@...tation.org>,
        linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 3/4] Input: pwm-vibra - add support for enable GPIO

On Dienstag, 2. Mai 2023 02:47:29 CEST Dmitry Torokhov wrote:
> On Thu, Apr 27, 2023 at 10:34:28PM +0200, Luca Weiss wrote:
> > Some pwm vibrators have a dedicated enable GPIO that needs to be set
> > high so that the vibrator works. Add support for that optionally.
> 
> So this is not simply a power supply in your case controlled by a GPIO?
> We truly can have both GPIO and a separate regulator?

Yes it appears to be the EN pin on the ISA1000A, see
https://electronics.stackexchange.com/q/380475

On apq8026-lg-lenok there is a similar setup for the vibration motor although 
there I don't know whether it's actually a fixed-regulator or not, but since 
the two devices were built in a similar time (without checking further) I 
could assume they both contain the same IC.

Regards
Luca

> 
> Thanks.