Re: [Xen-devel] [ARM:PATCH v2 1/1] Pass the timer clock-frequency to DOM0

[Suriyan Ramasami <suriyan.r@xxxxxxxxx>]

On Thu, Mar 27, 2014 at 2:48 PM, Julien Grall <julien.grall@xxxxxxxxxx> wrote:
> Hello Suriyan,
>
> (Adding the other Xen ARM maintainers).
>
> Thank you for the patch. Xen-devel starts to have a big traffic, we use to
> cc maintainers on patches. You can find them via script/get_maintainers.pl
>
Thank you for the comments Julien. Next time around, I shall make sure
I use get_maintainers.pl and get the list of the maintainers that I
need to cc.

>
> On 27/03/14 03:54, Suriyan Ramasami wrote:
>>
>>      xen/arm: Pass the timer "clock-frequency" to DOM0 in make_timer_node
>
>
> You guess you are copying git show in an email? If so, I advise you to read
> this website:
> http://alblue.bandlem.com/2011/12/git-tip-of-week-patches-by-email.html
>
I actually used git send-email as mentioned in the wiki.

>
>>      If the DT representing the ARM generic timer mentions a
>> clock-frequency,
>>      propragate it to the DT that is built for DOM0.
>>
>>      This is necessary as a workaround for boards (Odroid-XU) where CNTFRQ
>> is
>>      not set or returns a wrong value.
>
>
> Do you have any plan to send a similar patch for domU?
>
I am exploring other options for domU - possibly a parameter that can
be introduced in the cfg file for the domU. I am still exploring. Any
suggestions would be deeply appreciated!

I also am in parallel working on a patch for the odroid-xu (exynos5410).

>>
>> @@ -639,6 +641,9 @@ static int make_timer_node(const struct domain *d,
>> void *fdt,
>>           return -FDT_ERR_XEN(ENOENT);
>>       }
>>
>> +    clock_valid = dt_property_read_u32(dev, "clock-frequency",
>> +                                       &clock_frequency);
>> +
>
>
> Can you gather all your changes in one place? I don't see why you need to
> read the clock-frequency earlier.
>
I could gather them in one place, but I mimicked what make_cpus_node()
does, so that make_timer_node() too has similar code. Please let me
know if you would really like it in one place.

Regards
- Suriyan
> Regards
>
> --
> Julien Grall

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