linux-kernel - Re: [PATCHv6 3/4] iio: devicetree: Add DT binding documentation for Exynos3250 ADC

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Message-ID: <5835825.JtcDoyOP8b@wuerfel>
Date:	Fri, 18 Jul 2014 18:33:06 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Chanwoo Choi <cwchoi00@...il.com>
Cc:	Chanwoo Choi <cw00.choi@...sung.com>, jic23@...nel.org,
	naveen krishna <ch.naveen@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Rob Herring <robh+dt@...nel.org>, pawel.moll@....com,
	Mark Rutland <mark.rutland@....com>,
	ijc+devicetree@...lion.org.uk, Kumar Gala <galak@...eaurora.org>,
	rdunlap@...radead.org, Kyungmin Park <kyungmin.park@...sung.com>,
	Tomasz Figa <t.figa@...sung.com>, linux-iio@...r.kernel.org,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	devicetree <devicetree@...r.kernel.org>,
	linux-doc@...r.kernel.org
Subject: Re: [PATCHv6 3/4] iio: devicetree: Add DT binding documentation for Exynos3250 ADC

On Saturday 19 July 2014 01:23:15 Chanwoo Choi wrote:
> If don't add new compatible including specific exynos version,
> I would add new 'adc-needs-sclk' property with existing 'exynos-adc-v2'
> compatible name.
> 
> 
> Dear Naveen, Tomasz,
> 
> If existing exynos-adc driver add just one property for 'sclk_adc'
> as following, exynos-adc could not include the exynos version
> in compatible name.
> 
> I need your opinion about it.
> 
>                 adc: adc@...C0000 {
>                         compatible = "samsung,exynos-adc-v2";
>                         reg = <0x126C0000 0x100>, <0x10020718 0x4>;
>                         interrupts = <0 137 0>;
>                         clock-names = "adc", "sclk_adc";
>                         clocks = <&cmu CLK_TSADC>, <&cmu CLK_SCLK_TSADC>;
> +                        adc-needs-sclk;
>                         #io-channel-cells = <1>;
>                         io-channel-ranges;
>                 }

How about just making it an optional clock? That would be much
easier because then you can simply see if the clock itself is
there and use it, or otherwise ignore it.

	Arnd
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