Re: [PATCH] clk: debug clock tree

[Prashant Gaikwad]

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@xxxxxxxxxx> 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.

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