linux-kernel - RE: [PATCH v3 3/6] dt-bindings: mfd: da9062: add regulator voltage selection documentation

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Message-ID: <AM5PR1001MB0994377F69ED2EFF2BEB580380500@AM5PR1001MB0994.EURPRD10.PROD.OUTLOOK.COM>
Date:   Tue, 17 Dec 2019 13:13:10 +0000
From:   Adam Thomson <Adam.Thomson.Opensource@...semi.com>
To:     Marco Felsch <m.felsch@...gutronix.de>,
        Adam Thomson <Adam.Thomson.Opensource@...semi.com>
CC:     Mark Brown <broonie@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Support Opensource <Support.Opensource@...semi.com>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "bgolaszewski@...libre.com" <bgolaszewski@...libre.com>,
        "andrew@...id.au" <andrew@...id.au>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "joel@....id.au" <joel@....id.au>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "lee.jones@...aro.org" <lee.jones@...aro.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v3 3/6] dt-bindings: mfd: da9062: add regulator voltage
 selection documentation

On 17 December 2019 12:31, Marco Felsch wrote:

> On 19-12-17 09:53, Adam Thomson wrote:
> > On 17 December 2019 09:01, Marco Felsch wrote:
> >
> > > > > The enabel control signal is always available, please check [1] table
> > > > > 63. There is a mux in front of the enable pin so:
> > > > >
> > > > >              +-------------
> > > > >  Seq. |\     |   Regulator
> > > > >  GPI1 | \    |
> > > > >  GPI2 | | -- > Enable
> > > > >  GPI3 | /    |
> > > > >       |/     .
> > > > >              .
> > > > >              .
> > > > >
> > > > > Adam please correct me if this is wrong.
> > > >
> > > > Yes the register can always be configured regardless of the associated pin
> > > > configuration, but if say GPIO1 was configured as a GPO but a regulator was
> > > > configured to use GPIO1 as its GPI control mechanism, the output signal
> from
> > > > GPIO1 would be ignored, the sequencer control would not have any effect
> and
> > > > you're simply left with manual I2C control. Really we shouldn't be getting
> into
> > > > that situation though. If a GPIO is to be used as a regulator control signal
> > > > then it should be marked as such and I don't think we should be able to use
> that
> > > > pin for anything other than regulator control.
> > >
> > > I see, so we have to guarantee that the requested gpio is configured as
> > > input. This can be done by:
> >
> > This is one of the reasons I thought this was better suited to being done in the
> > pinctrl/pinmux side. If you configure the GPIO as for regulator control then
> > the code can automatically configure the GPIO for input. That doesn't then
> need
> > to be in the regulator driver.
> 
> I still don't prefer that way.. pls check my arguments I already made
> and I don't wanna repeat it again.

Yes, I read your arguments but still can't agree :)