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Date:   Thu, 13 Apr 2017 14:14:25 +0200
From:   Linus Walleij <>
To:     Charles Keepax <>
Cc:     Richard Fitzgerald <>,
        Rob Herring <>,
        Lee Jones <>,
        Alexandre Courbot <>,
        Mark Rutland <>,
        "" <>,
        "" <>,
        "" <>,
Subject: Re: [PATCH 1/2] mfd: arizona: Add GPIO maintain state flag

On Thu, Apr 13, 2017 at 11:15 AM, Charles Keepax
<> wrote:
> On Tue, Apr 11, 2017 at 10:34:27AM +0100, Richard Fitzgerald wrote:

>> 3) The codec only has to be kept awake while any such GPIO is actually
>> in use. See (2)
> Yeah option 3 is the primary issue here, we only want to keep the
> CODEC enabled whilst specific GPIOs are in use. As GPIOs can be
> dynamically requested/released by things in the kernel we want to
> know which GPIOs require the CODEC to be kept alive. Also in the
> future one might be tempted to add maintain whilst high and
> maintain whilst low options for lines with pulls on them to
> further optimise power.

Why does this have to be encoded as information in the device
tree? Isn't it better to use a static table in the driver?

I don't see what use system integrators and others playing
around with the device tree has of this, it will just be confusing
to them if it is a chip-internal detail.

Linus Walleij

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