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

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Message-ID: <CACRpkdZRmJTF9_yzVJx_vPKH6M6PivcrPiLD7xMEs5HDvsLw7g@mail.gmail.com>
Date:	Tue, 27 Oct 2015 10:41:14 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Pramod Kumar <pramodku@...adcom.com>
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 <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

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
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