From: wangkefeng.wang@huawei•com (Kefeng Wang)
To: linux-arm-kernel@lists•infradead.org
Subject: question about i2c-designware
Date: Fri, 10 Jul 2015 12:11:38 +0800 [thread overview]
Message-ID: <559F45FA.8060801@huawei.com> (raw)
In-Reply-To: <559E37D7.6040103@huawei.com>
+ linux-arm-kernel at lists.infradead.org
On 2015-07-09 16:59, Kefeng Wang wrote:
> Hi all,
>
> We met a issue when use Synopsys DesignWare I2C. The SDA will keep low level and never go back to the high level
> if both i2c controllers simultaneously access the same i2c device(rtc), then both two i2c controllers can't send any data.
> we try to reset the rtc, but not working. After reset the i2c controller, the SDA goes back to the high state and we
> can get time from rtc again.
>
> The scenario is as follows, any advice will be appreciated.
>
> OS 1 | OS 2
> |
> +--------------+----------|--------------+
> | | | |
> | +---------|----+-----|---------+ |
> | | | | | | |
> ---------------- ------ | -----------------
> |i2c controller1| | rtc| | |i2c controller2|
> ---------------- ------ | -----------------
> |
> note:
> 1) i2c controller1 and controller2 use same IP.
> 2) OS1 use v3.19 and OS2 use 2.6
>
> Thanks
> Kefeng
>
parent reply other threads:[~2015-07-10 4:11 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <559E37D7.6040103@huawei.com>]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=559F45FA.8060801@huawei.com \
--to=wangkefeng.wang@huawei$(echo .)com \
--cc=linux-arm-kernel@lists$(echo .)infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox