linux-kernel - Re: [PATCH v2] i2c: rk3x: fix bug that cause measured high

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Message-ID: <CAD=FV=Vp3hwxbDzb+FUhNXy8qW8fTCkgd67jRDV3foT0o9HQuQ@mail.gmail.com>
Date:	Thu, 4 Dec 2014 10:43:19 -0800
From:	Doug Anderson <dianders@...omium.org>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	Addy Ke <addy.ke@...k-chips.com>,
	Max Schwarz <max.schwarz@...ine.de>,
	Heiko Stübner <heiko@...ech.de>,
	Olof Johansson <olof@...om.net>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...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>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	Eddie Cai <cf@...k-chips.com>, Jianqun Xu <xjq@...k-chips.com>,
	Tao Huang <huangtao@...k-chips.com>,
	Chris <zyw@...k-chips.com>,
	姚智情 <yzq@...k-chips.com>,
	han jiang <hj@...k-chips.com>,
	Kever Yang <kever.yang@...k-chips.com>,
	Lin Huang <hl@...k-chips.com>,
	caesar <caesar.wang@...k-chips.com>,
	Shunqian Zheng <zhengsq@...k-chips.com>
Subject: Re: [PATCH v2] i2c: rk3x: fix bug that cause measured high_ns doesn't
 meet I2C spec

Wolfram,

On Thu, Dec 4, 2014 at 10:40 AM, Wolfram Sang <wsa@...-dreams.de> wrote:
>
>> If you don't read all the below, my belief is that we should simply
>> rename the strings in Addy's patch.  We should change "rise-ns" to
>> "i2c-scl-rising-time" and "fall-ns" to "i2c-scl-falling-time".
>> Wolfram: can you confirm this is OK?  I'm voting to leave the "-ns"
>> off the end of both to avoid asymmetry.
>
> New binding should have the "-ns" suffix, right? So, I'd vote to add the
> suffix to the new bindings and deprecate the ones used in the designware
> driver: "i2c-scl-rising-time-ns" and "i2c-scl-falling-time-ns"
>
> It might be a little more work now, but it will help us in the future,
> because it is the correct way to do it.

OK, that sounds fair.  You're OK with my proposal otherwise?

Are you looking for Addy or me to submit a patch supporting the "-ns"
suffix on the Designware i2c driver, or should we just use the "-ns"
suffix in the Rockchip driver and assume someone will later add
support for the new binding in the Designware i2c driver?

-Doug
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