linux-kernel - Re: [PATCH] i2c: at91: fix support of the "alternative command" feature

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Date:	Mon, 15 Aug 2016 00:34:37 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Ludovic Desroches <ludovic.desroches@...el.com>
Cc:	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	nicolas.ferre@...el.com, linux-arm-kernel@...ts.infradead.org,
	Cyrille Pitchen <cyrille.pitchen@...el.com>
Subject: Re: [PATCH] i2c: at91: fix support of the "alternative command"
 feature

On Wed, Aug 03, 2016 at 04:58:26PM +0200, Ludovic Desroches wrote:
> From: Cyrille Pitchen <cyrille.pitchen@...el.com>
> 
> The "alternative command" feature was introduced with sama5d2 SoCs.
> 
> Its purpose is to let the hardware i2c controller automatically send the
> STOP condition on the i2c bus at the end of a data transfer.
> Without this feature, the i2c driver has to write the 'STOP' bit into the
> Control Register so the hardware i2c controller is triggered to send the
> STOP condition on the bus.
> 
> Using the "alternative command" feature requires to set the transfer data
> length into the 8bit DATAL field of the Alternative Command Register.
> Hence only data transfers up to 255 bytes can take advantage of the
> "alternative command" feature. For greater data transfer sizes, the driver
> should use the previous implementation, when the "alternative command"
> support was not implemented yet.
> 
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@...el.com>
> Signed-off-by: Ludovic Desroches <ludovic.desroches@...el.com>

Applied to for-current, thanks!


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