linux-kernel - Re: [PATCH v3 2/3] dt-bindings: Add pinctrl bindings for mt65xx/mt81xx.

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Message-ID: <1421403805.11671.58.camel@mtksdaap41>
Date:	Fri, 16 Jan 2015 18:23:25 +0800
From:	Yingjoe Chen <yingjoe.chen@...iatek.com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Sascha Hauer <s.hauer@...gutronix.de>,
	Rob Herring <robh+dt@...nel.org>,
	Hongzhou Yang <hongzhou.yang@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Sascha Hauer <kernel@...gutronix.de>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Grant Likely <grant.likely@...aro.org>,
	Heiko Stübner <heiko@...ech.de>,
	Catalin Marinas <catalin.marinas@....com>,
	Vladimir Murzin <vladimir.murzin@....com>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	huang eddie <eddie.huang@...iatek.com>,
	<dandan.he@...iatek.com>, <alan.cheng@...iatek.com>,
	<toby.liu@...iatek.com>
Subject: Re: [PATCH v3 2/3] dt-bindings: Add pinctrl bindings for
 mt65xx/mt81xx.

On Fri, 2015-01-16 at 10:53 +0100, Linus Walleij wrote:
> On Tue, Jan 13, 2015 at 5:16 PM, Sascha Hauer <s.hauer@...gutronix.de> wrote:
> > On Tue, Jan 13, 2015 at 11:05:22AM +0100, Linus Walleij wrote:
> 
> >> > You often talk about ambiguities. Could you give an example what
> >> > ambiguities you mean?
> >>
> >> What happened was this pins = ; arguments were sometimes
> >> strings and sometimes integers, that becomes strange to handle
> >> in code, ambiguous.
> >
> > I see. I like naming it 'pinmux' because that's what it is: pins and
> > mux settings. A plain 'pinno' suggests that it contains only pin mubers,
> > without mux setting. How about 'pin-no-mux'? We also could add an
> > explicit "pins-are-numbered" property instead of distinguishing this
> > by property names.
> 
> I kind of like this "pins-are-numbered" thing.
> 
> The other property for the pin, whether pinmux or pin-no-mux or
> pin-num-and-mux etc is no such big deal, as long as it's
> consistent and documented with the generic bindings.

Hi Linus,

To make sure I understand it correct, you think something like this is
OK?

	pinctrl@...20800 {
		compatible = "mediatek,mt8135-pinctrl";
[...]
		pins-are-numbered;

		i2c0_pins_a: i2c0@0 {
			pins1 {
				pins = <MT8135_PIN_100_SDA0__FUNC_SDA0>,
					<MT8135_PIN_101_SCL0__FUNC_SCL0>;
				bias-disable;
			};
		};
[....]
	}

Joe.C


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