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SubjectRe: [PATCH] clk: debug clock tree
On Sun, Dec 23, 2012 at 4:26 AM, Prashant Gaikwad <pgaikwad@nvidia.com> wrote:
> On Saturday 22 December 2012 04:26 AM, Mike Turquette wrote:
>>
>> On Wed, Dec 19, 2012 at 11:53 PM, Prashant Gaikwad <pgaikwad@nvidia.com>
>> wrote:
>>>
>>> On Thursday 13 December 2012 11:31 PM, Stephen Warren wrote:
>>>>
>>>> On 12/13/2012 09:27 AM, Mike Turquette wrote:
>>>>>
>>>>> On Wed, Dec 12, 2012 at 7:49 PM, Prashant Gaikwad <pgaikwad@nvidia.com>
>>>>> wrote:
>>>>>>
>>>>>> Adds debug file "clock_tree" in /sys/kernel/debug/clk dir.
>>>>>> It helps to view all the clock registered in tree format.
>>>>>>
>>>>> Prashant,
>>>>>
>>>>> Thanks for submitting this. We've been talking about having a single
>>>>> file for representing the tree for some time.
>>>>>
>>>>> Regarding the output format had you considered using a well known
>>>>> format which can be parsed using well known parsing libs? This avoids
>>>>> needing a custom parser just for this one file. JSON springs to mind
>>>>> as something lightweight and well-understood.
>>>>
>>>> One advantage of the format below is that it's very easily
>>>> human-readable, and it's not too hard to parse (although I guess you'd
>>>> have to parse the indent level to get parent/child relation, which would
>>>> suck a bit). Is there room to provide both? Otherwise, I guess the
>>>> kernel could include a script to convert from JSON/whatever into the
>>>> format below.
>>>>
>>>>>> For example:
>>>>>> clock enable_cnt prepare_cnt rate
>>>>>> ---------------------------------------------------------------------
>>>>>> i2s0_sync 0 0 24000000
>>>>>> spdif_in_sync 0 0 24000000
>>>>>> spdif_mux 0 0 24000000
>>>>>> spdif 0 0 24000000
>>>>>> spdif_doubler 0 0 48000000
>>>>>> spdif_div 0 0 48000000
>>>>>> spdif_2x 0 0 48000000
>>>>
>>>>
>>> Even I think that output must be easily human-readable. How about adding
>>> sysfs to switch between human-readable and machine-readable format?
>>> I will try come up with a implementation.
>>>
>> Do you mean a sysfs file which controls the output format? How about
>> just two different files? One can be clk-dump (machine readable) and
>> the other is clk-summary (human readable).
>
>
> It is also fine. Is this patch ok for human-readable format? or any
> suggestions?
> I will change the file name to clk-summary.
>

Prashant,

Yes the format seems to be agreeable for human-readable format based
on the feedback on the list. Go ahead and keep the column titles and
the dashed lines that I commented on earlier... my comments are less
relevant if a separate machine-readable clk-dump file exists.

Are you going to take a crack at JSON-formatted output for clk-dump?

Thanks,
Mike

>>
>> Regards,
>> Mike
>
>


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