linux-kernel - Re: [PATCH 1/2] Input: bcm-keypad: add device tree bindings

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Message-ID: <20150223174913.GB604@dtor-glaptop>
Date:	Mon, 23 Feb 2015 09:49:13 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Scott Branden <sbranden@...adcom.com>
Cc:	bcm-kernel-feedback-list@...adcom.com,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	Ray Jui <rjui@...adcom.com>,
	Jonathan Richardson <jonathar@...adcom.com>,
	Dmitry Torokhov <dtor@...gle.com>,
	Anatol Pomazao <anatol@...gle.com>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] Input: bcm-keypad: add device tree bindings

Hi Scott,

On Sun, Feb 15, 2015 at 09:17:51PM -0800, Dmitry Torokhov wrote:
> On Sat, Feb 14, 2015 at 08:49:15AM -0800, Scott Branden wrote:
> > On 15-02-09 04:51 PM, Dmitry Torokhov wrote:
> > >On Mon, Feb 09, 2015 at 04:07:40PM -0800, Scott Branden wrote:
> > >>+
> > >>+- col-debounce-filter-period: The debounce period for the Column filter.
> > >>+
> > >>+	KEYPAD_DEBOUNCE_1_ms	=	0
> > >>+	KEYPAD_DEBOUNCE_2_ms	=	1
> > >>+	KEYPAD_DEBOUNCE_4_ms	=	2
> > >>+	KEYPAD_DEBOUNCE_8_ms	=	3
> > >
> > >>+	KEYPAD_DEBOUNCE_16_ms	=	4
> > >>+	KEYPAD_DEBOUNCE_32_ms	=	5
> > >>+	KEYPAD_DEBOUNCE_64_ms	=	6
> > >>+	KEYPAD_DEBOUNCE_128_ms	=	7
> > >>+
> > >>+- status-debounce-filter-period: The debounce period for the Status filter.
> > >>+
> > >>+	KEYPAD_DEBOUNCE_1_ms	=	0
> > >>+	KEYPAD_DEBOUNCE_2_ms	=	1
> > >>+	KEYPAD_DEBOUNCE_4_ms	=	2
> > >>+	KEYPAD_DEBOUNCE_8_ms	=	3
> > >>+	KEYPAD_DEBOUNCE_16_ms	=	4
> > >>+	KEYPAD_DEBOUNCE_32_ms	=	5
> > >>+	KEYPAD_DEBOUNCE_64_ms	=	6
> > >>+	KEYPAD_DEBOUNCE_128_ms	=	7
> > >
> > >I could swear device-specific properties should be in form of
> > ><vendor-prefix>,<property-name> to ensure it won't clash with changes on
> > >subsystem level later on. Device-tree folks, what say you?
> > I see examples with and without vendor-prefix.
> > qcom,pm8xxx-keypad.txt does not have prefixes
> > st-keyscan.txt does have a prefix
> > 
> > I can't find any documented guidelines for this.
> 
> As I mentioned I'll try to get clarification on this.

I have chatted with a couple of people on this and it is acceptable to
omit vendor prefix in bindings when we are using a specific driver like
we have here (i.e. when driver's compatible string already includes
vendor prefix). Vendor prefixes on properties are required when we
augment a generic driver's binding.

So the above 2 entries are fine as is.

Thanks.

-- 
Dmitry
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