linux-kernel - Re: [PATCH V3 1/3] dt-bindings: mmc: Supply max load for mmc supplies

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Message-ID: <20200610100008.GA5005@sirena.org.uk>
Date:   Wed, 10 Jun 2020 11:00:08 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Veerabhadrarao Badiganti <vbadigan@...eaurora.org>,
        adrian.hunter@...el.com, ulf.hansson@...aro.org,
        bjorn.andersson@...aro.org, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH V3 1/3] dt-bindings: mmc: Supply max load for mmc supplies

On Tue, Jun 09, 2020 at 05:02:16PM -0600, Rob Herring wrote:
> On Tue, Jun 02, 2020 at 04:17:54PM +0530, Veerabhadrarao Badiganti wrote:

> > +  vmmc-supply-max-microamp:
> > +    description: Maximum load for the card power.

> > +  vqmmc-supply-max-microamp:
> > +    description: Maximum load for the bus IO line power.

> By a 'common regulator property' I meant documented with regulator 
> binding like *-supply, not common to MMC. How is MMC special?

TBH I'm surprised that these aren't defined by the MMC spec or by the ID
information from the part we find connected - I'd not expect the board
to be defining these at all.

> Thinking about this some more, what's wrong with the max current in the 
> regulator nodes? I suppose you could have more than one load and need to 
> define the loads separately?

One of the bigger reasons to think about the loads would be to
dynamically configure the mode the regulator is in to go into a more
efficient mode when some of the devices attached to it are turned off.

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