linux-kernel - Re: [PATCH 2/5] dt-bindings: mfd: da9062: add regulator voltage selection documentation

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Message-ID: <20190925155151.75uaxfiiei3i23tz@pengutronix.de>
Date:   Wed, 25 Sep 2019 17:51:51 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Adam Thomson <Adam.Thomson.Opensource@...semi.com>
Cc:     Support Opensource <Support.Opensource@...semi.com>,
        "lee.jones@...aro.org" <lee.jones@...aro.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        Steve Twiss <stwiss.opensource@...semi.com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/5] dt-bindings: mfd: da9062: add regulator voltage
 selection documentation

Hi Adam,

On 19-09-24 09:23, Adam Thomson wrote:
> On 17 September 2019 13:43, Marco Felsch wrote:
> 
> > Add the documentation which describe the voltage selection gpio support.
> > This property can be applied to each subnode within the 'regulators'
> > node so each regulator can be configured differently.
> > 
> > Signed-off-by: Marco Felsch <m.felsch@...gutronix.de>
> > ---
> >  Documentation/devicetree/bindings/mfd/da9062.txt | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/mfd/da9062.txt
> > b/Documentation/devicetree/bindings/mfd/da9062.txt
> > index edca653a5777..9d9820d8177d 100644
> > --- a/Documentation/devicetree/bindings/mfd/da9062.txt
> > +++ b/Documentation/devicetree/bindings/mfd/da9062.txt
> > @@ -66,6 +66,15 @@ Sub-nodes:
> >    details of individual regulator device can be found in:
> >    Documentation/devicetree/bindings/regulator/regulator.txt
> > 
> > +  Optional regulator device-specific properties:
> > +  - dlg,vsel-sense-gpios : The GPIO reference which should be used by the
> > +    regulator to switch the voltage between active/suspend voltage settings. If
> > +    the signal is active the active-settings are applied else the suspend
> > +    settings are applied. Attention: Sharing the same gpio for other purposes
> > +    or across multiple regulators is possible but the gpio settings must be the
> > +    same. Also the gpio phandle must refer to to the dlg,da9062-gpio device
> > +    other gpios are not allowed and make no sense.
> > +
> 
> Should we not use the binding names that are defined in 'gpio-regulator.yaml' as
> these seem to be generic and would probably serve the purpose here?

Hm.. as the description says:

8<--------------------------------------------------
gpios:
   description: Array of one or more GPIO pins used to select the
   regulator voltage/current listed in "states".
8<--------------------------------------------------

But we don't have a "states" property and we can't select between
voltage or current.

Regards,
  Marco

> >  - rtc : This node defines settings required for the Real-Time Clock associated
> >    with the DA9062. There are currently no entries in this binding, however
> >    compatible = "dlg,da9062-rtc" should be added if a node is created.
> > --
> > 2.20.1
> 
> 

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