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

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Date:   Tue, 14 Jan 2020 15:43:14 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Marco Felsch <m.felsch@...gutronix.de>
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>,
        "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>,
        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 Tue, Jan 07, 2020 at 02:38:11PM +0100, Marco Felsch wrote:
> On 20-01-07 13:09, Mark Brown wrote:
> > On Tue, Jan 07, 2020 at 09:36:54AM +0100, Marco Felsch wrote:

> > > The input signal is routed trough the da9062 gpio block to the
> > > regualtors. You can't set any voltage value using a gpio instead you
> > > decide which voltage setting is applied. The voltage values for
> > > runtime/suspend comes from the dt-data. No it's not just a fast
> > > switching option imagine the system suspend case where the cpu and soc
> > > voltage can be reduced to a very low value. Older soc's like the imx6
> > > signaling this state by a hard wired gpio line because the soc and
> > > cpu cores don't work properly on such low voltage values. This is
> > > my use case and I can't use the sequencer.

> > My point is that I can't tell any of this from the description.

> Therefore I want to discuss the dt-binding documentation with you and
> the others to get this done. Is the above description better to
> understand the dt-binding?

That text really doesn't feel like text that'd be idiomatic
directly in a binding document but some of those ideas probably
do need to be in the text I think.

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