[RFC PATCH i2c-next 1/2] dt-bindings: i2c: aspeed: Add 'idle-wait-timeout-ms' setting

Jae Hyun Yoo jae.hyun.yoo at linux.intel.com
Wed Sep 26 02:20:02 AEST 2018

On 9/25/2018 1:27 AM, Wolfram Sang wrote:
> On Mon, Sep 24, 2018 at 03:15:46PM -0700, Jae Hyun Yoo wrote:
>> Hi Wolfram,
>> On 9/24/2018 2:58 PM, Wolfram Sang wrote:
>>> On Tue, Sep 18, 2018 at 11:02:54AM -0700, Jae Hyun Yoo wrote:
>>>> On 9/10/2018 2:45 PM, Jae Hyun Yoo wrote:
>>>>> +- idle-wait-timeout-ms	: bus idle waiting timeout in milliseconds when
>>>>> +			  multi-master is set, defaults to 100 ms when not
>>>>> +			  specified.
>>>> Will change it to 'aspeed,idle-wait-timeout-ms' as it's a non standard
>>>> property.
>>> No need. This binding is not a HW description, so not a DT property in
>>> my book. I still don't understand: Your IP core in master mode does not
>>> have a BUSY bit or similar which detects when a START was detected and
>>> clears after a STOP?
>> Okay, I'll keep this property as it is then.
> Sorry for the misunderstanding. I don't think this a property, at all.
> It doesn't describe the hardware, it is more of a configuration thing,
> or?

You are right. It doesn't describe the hardware but it needs to be
configurable because it very depends on the peer master's behavior.
If peer master sends a long packet usually, it should have a long
timeout value since a slave receiving operation takes long time,
and it should be adjusted with an optimal value with taking some
experiments to make it not too long. Any suggestion?


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