linux-kernel - Re: [PATCH v2] rtc: ds1307: add trickle charger device tree binding

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Date:	Fri, 29 Aug 2014 11:49:04 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Matti Vaittinen <matti.vaittinen@....com>
Cc:	"a.zummo@...ertech.it" <a.zummo@...ertech.it>,
	"jason@...edaemon.net" <jason@...edaemon.net>,
	"linux@...ck-us.net" <linux@...ck-us.net>,
	"jic23@...nel.org" <jic23@...nel.org>,
	"arno@...isbad.org" <arno@...isbad.org>,
	"jgunthorpe@...idianresearch.com" <jgunthorpe@...idianresearch.com>,
	"san@...etechnology.dk" <san@...etechnology.dk>,
	"hs@...x.de" <hs@...x.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rtc-linux@...glegroups.com" <rtc-linux@...glegroups.com>,
	Sverdlin Alexander <alexander.sverdlin@....com>
Subject: Re: [PATCH v2] rtc: ds1307: add trickle charger device tree binding

Hi Mati,

Looks like my last reply [1] raced with this posting.

[...]

> +Optional properties:
> +- trickle : Used Trickle Charger configuration,
> +	corresponding to 4 lowest bits in trickle charger register.
> +	Following values are specified:
> +		0x5 => No diode, 250 ohm
> +		0x9 => Diode, 250 ohm
> +		0x6 => No diode, 2k ohm
> +		0xa => Diode, 2k ohm
> +		0x7 => No diode, 4k ohm
> +		0xb => Diode, 4k ohm

Optional?

For an optional property, please describe when said property should be
present, and what the absence implies.

Usually something like "should be present if $foo is not implemented in
$such_way", so it's obvious what the behaviour should be either way.

I still think this should be two proeprties and that the driver should
handle that as appropriate, as I mentioned in my last reply [1].

Mark.

[1] http://lkml.kernel.org/r/20140829104001.GB19424@leverpostej
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