linux-kernel - RE: [PATCH 05/11] dt-binding: Add ngpios property to GPIO controller node

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Date:	Wed, 28 Oct 2015 05:14:34 +0000
From:	Pramod Kumar <pramodku@...adcom.com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	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>, Ray Jui <rjui@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Russell King <linux@....linux.org.uk>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
	Jason Uy <jasonuy@...adcom.com>,
	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jonas Gorski <jogo@...nwrt.org>
Subject: RE: [PATCH 05/11] dt-binding: Add ngpios property to GPIO
 controller node

Hi Linus,

> -----Original Message-----
> From: Linus Walleij [mailto:linus.walleij@...aro.org]
> Sent: 27 October 2015 15:11
> To: Pramod Kumar
> Cc: Rob Herring; Pawel Moll; Mark Rutland; Ian Campbell; Kumar Gala; Ray Jui;
> Scott Branden; Russell King; linux-gpio@...r.kernel.org; bcm-kernel-feedback-
> list; Jason Uy; Masahiro Yamada; Thomas Gleixner; Laurent Pinchart;
> devicetree@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-
> kernel@...r.kernel.org; Jonas Gorski
> Subject: Re: [PATCH 05/11] dt-binding: Add ngpios property to GPIO controller
> node
> 
> On Mon, Oct 19, 2015 at 7:43 AM, Pramod Kumar <pramodku@...adcom.com>
> wrote:
> 
> > Add ngpios property to the gpio controller's DT node so that
> > controller driver extracts total number of gpio lines present in
> > controller from DT and removes dependency on driver.
> >
> > Signed-off-by: Pramod Kumar <pramodku@...adcom.com>
> > Reviewed-by: Ray Jui <rjui@...adcom.com>
> > Reviewed-by: Scott Branden <sbranden@...adcom.com>
> (...)
> > +- ngpios:
> > +    Total number of GPIOs the controller provides
> 
> This description is wrong. The number of GPIOs the controller *provides* is to
> be determined by the compatible-string.
> 
> ngpios is used to restrict the number of lines *used* or *routed* from the
> number *available*. (I hope that is what the code does as well.) Such as if 12
> GPIOs are used of the 32 available on 32bits in a register.
> 
> Update this description to say what it really means.
> 
> Yours,
> Linus Walleij

Thanks for reviewing . Will update the description.

Regards,
Pramod