linux-kernel - Re: [PATCH v2 4/4] mfd: max77620: add documentation for low battery monitoring

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Date:   Thu, 31 Jan 2019 15:05:46 -0600
From:   Rob Herring <robh@...nel.org>
To:     Mark Zhang <markz@...dia.com>
Cc:     Lee Jones <lee.jones@...aro.org>, blaws05@...il.com,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH v2 4/4] mfd: max77620: add documentation for low battery monitoring

On Wed, Jan 30, 2019 at 8:29 PM Mark Zhang <markz@...dia.com> wrote:
>
> On 1/31/2019 3:53 AM, Rob Herring wrote:
> > On Tue, Jan 29, 2019 at 04:55:31PM +0800, Mark Zhang wrote:
> >> Adding documentation for low battery monitor properties:
> >> - maxim,low-battery-dac-enable
> >> - maxim,low-battery-dac-disable
> >> - maxim,low-battery-shutdown-enable
> >> - maxim,low-battery-shutdown-disable
> >> - maxim,low-battery-reset-enable
> >> - maxim,low-battery-reset-disable
> >>
> >> Signed-off-by: Mark Zhang <markz@...dia.com>
> >> ---
> >>  Documentation/devicetree/bindings/mfd/max77620.txt | 14 ++++++++++++++
> >>  1 file changed, 14 insertions(+)
> >>
> >> diff --git a/Documentation/devicetree/bindings/mfd/max77620.txt b/Documentation/devicetree/bindings/mfd/max77620.txt
> >> index 484b17e4fba5..5fed0a463b80 100644
> >> --- a/Documentation/devicetree/bindings/mfd/max77620.txt
> >> +++ b/Documentation/devicetree/bindings/mfd/max77620.txt
> >> @@ -142,6 +142,20 @@ Optional properties:
> >>                      Device supports 100/1000/3000/6000 Ohms.
> >>                      Default will be set to 1000 Ohm.
> >>
> >> +Low-Battery Monitor:
> >> +==================
> >> +This sub-node configure low battery monitor configuration registers. Device has
> >> +support for low-battery monitor configuration through child DT node
> >> +"low-battery-monitor".

Missed this the first time, but there's not really any reason for
these to be in a child node.

> >> +
> >> +Optional properties:
> >> +    - maxim,low-battery-dac-enable: Enable low battery DAC.
> >> +    - maxim,low-battery-dac-disable: Disable low battery DAC.
> >> +    - maxim,low-battery-shutdown-enable: Enable low battery shutdown.
> >> +    - maxim,low-battery-shutdown-disable: Disable low battery shutdown.
> >> +    - maxim,low-battery-reset-enable: Enable low battery reset.
> >> +    - maxim,low-battery-reset-disable: Disable low battery reset.
> >
> > Do you really need 3 states with the 3rd being prop not present.
>
> Yeah, so I think we can just keep 3 of them and shorten the names a little bit
> (lbm stands for "low battery monitoring"):
> - maxim,lbm-dac-enable
> - maxim,lbm-shutdown-enable
> - maxim,lbm-reset-enable
>
> Does this look good to you?

Yes. However, are these 3 mutually exclusive? If so, then perhaps
'maxim,low-battery-mode = "<dac|shutdown|reset>"'?

Rob