linux-kernel - Re: [PATCH v8 8/8] i2c: rk3x: support fast-mode plus for rk3399

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Message-ID: <CAD=FV=VzQ8PRokgAaTV00L31mcXFEzBG8c1NB4+Rqyx75hwwDg@mail.gmail.com>
Date:	Wed, 11 May 2016 16:41:54 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Heiko Stuebner <heiko@...ech.de>
Cc:	David Wu <david.wu@...k-chips.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	Rob Herring <robh+dt@...nel.org>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Brian Norris <briannorris@...gle.com>,
	David Riley <davidriley@...gle.com>,
	Tao Huang <huangtao@...k-chips.com>,
	Lin Huang <hl@...k-chips.com>, Jianqun Xu <xjq@...k-chips.com>,
	Chris <zyw@...k-chips.com>, Eddie Cai <cf@...k-chips.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 8/8] i2c: rk3x: support fast-mode plus for rk3399

Heiko,

On Wed, May 11, 2016 at 2:09 PM, Heiko Stuebner <heiko@...ech.de> wrote:
> Additionally, the i2c-noob in me would wish for a short sentence on where
> the timing values come from (measured, somewhere in the TRM I didn't find or
> something completely different).

If you search for "UM10204" you'll find the first link is
<http://www.nxp.com/documents/user_manual/UM10204.pdf>.  That appears
to be the official standard.  At least that's what
<http://www.i2c-bus.org/fast-mode-plus/> says (though they have an old
link).

Agree that it wouldn't hurt to mention that in the commit message.

-Doug