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

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Message-ID: <20191204134631.GT1998@sirena.org.uk>
Date:   Wed, 4 Dec 2019 13:46:31 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Marco Felsch <m.felsch@...gutronix.de>
Cc:     support.opensource@...semi.com, lee.jones@...aro.org,
        robh+dt@...nel.org, linus.walleij@...aro.org,
        bgolaszewski@...libre.com, joel@....id.au, andrew@...id.au,
        lgirdwood@...il.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-aspeed@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, kernel@...gutronix.de
Subject: Re: [PATCH v3 3/6] dt-bindings: mfd: da9062: add regulator voltage
 selection documentation

On Fri, Nov 29, 2019 at 06:25:34PM +0100, Marco Felsch wrote:

> +  Optional regulator device-specific properties:
> +  - dlg,vsel-sense-gpios : A GPIO reference to a local general purpose input,
> +    the datasheet calls it GPI. The regulator sense the input signal and select
> +    the active or suspend voltage settings. If the signal is active the
> +    active-settings are applied else the suspend-settings are applied.
> +    Attention: Sharing the same GPI for other purposes or across multiple
> +    regulators is possible but the polarity setting must equal.

I'm really confused by this.  As far as I understand it it seems
to be doing pinmuxing on the chip using the GPIO bindings which
is itself a bit odd and I don't see anything here that configures
whatever sets the state of the pins.  Don't we need another GPIO
to set the vsel-sense inputs on the PMIC?

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