[PATCH V7 3/6] i2c: qup: Transfer each i2c_msg in i2c_msgs without a stop bit
From: Sricharan <hidden>
Date: 2016-02-05 08:00:39
Also in:
linux-arm-msm, linux-devicetree, linux-i2c, lkml
Hi Wolfram,
-----Original Message----- From: linux-arm-kernel [mailto:linux-arm-kernel- bounces at lists.infradead.org] On Behalf Of Wolfram Sang Sent: Friday, February 05, 2016 1:39 AM To: Sricharan Cc: devicetree at vger.kernel.org; architt at codeaurora.org; linux-arm- msm at vger.kernel.org; ntelkar at codeaurora.org; galak at codeaurora.org; linux-kernel at vger.kernel.org; andy.gross at linaro.org; linux- i2c at vger.kernel.org; iivanov at mm-sol.com; agross at codeaurora.org; dmaengine at vger.kernel.org; linux-arm-kernel at lists.infradead.org Subject: Re: [PATCH V7 3/6] i2c: qup: Transfer each i2c_msg in i2c_msgs without a stop bit Hi,quoted
Ah, so what I meant above is there is no 'STOP' bit between each msg in i2c_msgs, but 'REAPEATED_START' still holds true. We are sending 'START' bit for each msg. So these is how each msg in i2c_msg is sent, |------MSG1--------|-----MSG2---------|------MSG3------------| |START|DATA|------|START|DATA|---|START|DATA|STOP| If my commit text does not make this clear, I can reword that ?OK, now this looks to me perfectly fine: A number of *messages* concatenated into one *transfer* by repeated start. That's the way it
should
be. So, I'd simply remove these words: "The QUP i2c hardware has no way to inform that there should not be a 'STOP' at the end of transaction. The only way to implement this is to coalesce all the i2c_msg in i2c_msgs in to one transaction and transfer
them."
This sounded like the HW needed a special handling, so I was under the impression REP_START was broken. However, unless I misunderstood something again, this now sounds like the standard case and we can keep the commit message simple. If you are okay with that, I can update it
here,
no need to resend.
Yes the above modified commit text looks perfect to be updated and
thanks
for the update as well.
Regards,
Sricharan