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

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Message-ID: <20191216085525.csr2aglm5md4vtsw@pengutronix.de>
Date:   Mon, 16 Dec 2019 09:55:25 +0100
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Mark Brown <broonie@...nel.org>
Cc:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Support Opensource <Support.Opensource@...semi.com>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "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>,
        "bgolaszewski@...libre.com" <bgolaszewski@...libre.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "joel@....id.au" <joel@....id.au>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        Adam Thomson <Adam.Thomson.Opensource@...semi.com>,
        "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 19-12-12 16:51, Mark Brown wrote:
> On Thu, Dec 12, 2019 at 05:21:53PM +0100, Marco Felsch wrote:
> 
> > "... what's driving the input ..":
> > Sorry I didn't get you here. What did you mean? The input is driven by
> > the host. This can be any gpio line and in my case it is a gpio line
> > driven by the soc-hw during a suspend operation.
> 
> Something needs to say what that thing is, especially if it's runtime
> controllable.  In your case from the point of view of software there is
> actually no enable control so we shouldn't be providing an enable
> operation to the framework.

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.

[1] https://www.dialog-semiconductor.com/sites/default/files/da9062_datasheet_3v6.pdf

Regards,
  Marco

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