linux-kernel - Re: [RFC v4 2/2] backlight: device tree: add new tps611xx backlight binding

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Date:	Fri, 4 Jul 2014 17:31:19 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Daniel Jeong <gshark.jeong@...il.com>
Cc:	Jingoo Han <jg1.han@...sung.com>, Bryan Wu <cooloney@...il.com>,
	Lee Jones <lee.jones@...aro.org>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Daniel Jeong <daniel.jeong@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [RFC v4 2/2] backlight: device tree: add new tps611xx backlight
 binding

>     > +- rfa-enable: enable request for acknowledge.
>     > +  If RFA is enabled, the data byte includes the RFA bit and device will
>     wait
>     > +  and check acknowledge from device.
> 
>     You didn't answer my question as to why this should be in the DT.
> 
> 
> According to the RFA enable, the easy scale pin works differently.
> This value should be set before the first data transfer.

Sure, things works differently if this is set. That I understood.

What I haven't heard is a rationale as to why this configuration option
shuold be in the DT.

Can I enable this on all implementations, or not?

When would I enable this and when would I not?

The property reads like a switch to turn a feature on, rather than the
description of the presence of a feature.

Mark.
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