linux-kernel - Re: [PATCH 1/3] i2c: at91: add setting HOLD field of TWIHS

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Message-ID: <20151130155723.GA29282@odux.rfo.atmel.com>
Date:	Mon, 30 Nov 2015 16:57:23 +0100
From:	Ludovic Desroches <ludovic.desroches@...el.com>
To:	Wolfram Sang <wsa@...-dreams.de>
CC:	Ludovic Desroches <ludovic.desroches@...el.com>,
	<nicolas.ferre@...el.com>, <alexandre.belloni@...e-electrons.com>,
	<plagnioj@...osoft.com>, <linux-i2c@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <cyrille.pichen@...el.com>,
	Wenyou Yang <wenyou.yang@...el.com>
Subject: Re: [PATCH 1/3] i2c: at91: add setting HOLD field of TWIHS_CWGR via
 DT

On Mon, Nov 30, 2015 at 04:13:20PM +0100, Wolfram Sang wrote:
> On Tue, Nov 24, 2015 at 02:47:40PM +0100, Ludovic Desroches wrote:
> > From: Wenyou Yang <wenyou.yang@...el.com>
> > 
> > Add the HOLD field management. Some i2c devices need a longer data hold
> > time than the one given in the i2c bus specification. Since this value
> > depends on the i2c device connected to the bus, add a DT property to
> > configure it: "atmel,twd-hold-cycles".
> 
> We already have "i2c-sda-hold-time-ns". Can you use that one? Sorry that
> this is not obviously documented, I am working on it...
> 

I think we can use it, I'll rework the patch to convert duration in
number of cycles.
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