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Groups > linux.kernel > #1462499
| 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 |
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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!
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Re: [PATCH] i2c: at91: fix support of the "alternative command" feature Wolfram Sang <wsa@the-dreams.de> - 2016-08-15 00:40 +0200
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