Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]


Groups > linux.kernel > #1462499

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

From Wolfram Sang <wsa@the-dreams.de>
Newsgroups linux.kernel
Subject Re: [PATCH] i2c: at91: fix support of the "alternative command" feature
Date 2016-08-15 00:40 +0200
Message-ID <s6ceu-5Io-11@gated-at.bofh.it> (permalink)
References <s25Oh-3OA-13@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw


[Multipart message — attachments visible in raw view] - view raw

On Wed, Aug 03, 2016 at 04:58:26PM +0200, Ludovic Desroches wrote:
> From: Cyrille Pitchen <cyrille.pitchen@atmel.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@atmel.com>
> Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>

Applied to for-current, thanks!

Back to linux.kernel | Previous | Next | Find similar | Unroll thread


Thread

Re: [PATCH] i2c: at91: fix support of the "alternative command"  feature Wolfram Sang <wsa@the-dreams.de> - 2016-08-15 00:40 +0200

csiph-web