* question about i2c-designware
[not found] <559E37D7.6040103@huawei.com>
@ 2015-07-10 4:11 ` Kefeng Wang
0 siblings, 0 replies; only message in thread
From: Kefeng Wang @ 2015-07-10 4:11 UTC (permalink / raw)
To: linux-arm-kernel
+ 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
>
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[not found] <559E37D7.6040103@huawei.com>
2015-07-10 4:11 ` question about i2c-designware Kefeng Wang
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