linux-kernel - Re: [PATCH v2 4/4] ARM: dts: mt8135: Add pinctrl node for mt8135.

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Message-ID: <7840459.vtELiqVIOL@wuerfel>
Date:	Tue, 23 Sep 2014 16:10:09 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	"Joe. C" <srv_yingjoe.chen@...iatek.com>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org,
	"Hongzhou. Yang" <srv_hongzhou.yang@...iatek.com>,
	Vladimir Murzin <vladimir.murzin@....com>,
	Russell King <linux@....linux.org.uk>,
	Pawel Moll <pawel.moll@....com>, srv_heupstream@...iatek.com,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Hongzhou Yang <hongzhou.yang@...iatek.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	linux-kernel@...r.kernel.org,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	Kumar Gala <galak@...eaurora.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	dandan.he@...iatek.com
Subject: Re: [PATCH v2 4/4] ARM: dts: mt8135: Add pinctrl node for mt8135.

On Tuesday 23 September 2014 21:58:14 Joe. C wrote:
> Thanks for review. 
> The intend for these macros is helpin pinctrl user to write DT node.
> With these macro, we could write like this for i2c0:
> 
> mediatek,pinfunc = <MT8135_PIN_100_SDA0__FUNC_SDA0 
>                         MT8135_PIN_101_SCL0__FUNC_SCL0>;
> 
> We feel this is less error prone and easier to write than this:
> 
> mediatek,pinfunc = <MT_PIN_FUNC(100, 1) MT_PIN_FUNC(101, 1)>

But you don't actually use the same macros in the driver, so in effect
you just move the definitions from the file they are needed in to another
file as a macro.

It is no less error prone to define those macros in mt8135-pinfunc.h
than in the pinctrl node, just less readable.

	Arnd
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