Thread (10 messages) 10 messages, 4 authors, 2015-02-25

Re: [PATCH] thermal: armada: read stable temp on Armada XP

From: Gregory CLEMENT <hidden>
Date: 2015-02-25 16:10:25
Also in: linux-pm, lkml

Hi Tyler, Eduardo,

On 24/02/2015 20:56, Tyler Hall wrote:
Eduardo,

On Tue, Feb 24, 2015 at 1:36 PM, Eduardo Valentin [off-list ref] wrote:
quoted
The fix seams reasonable. Although, it remains the question what is
applicability to other Armada chips? Besides, shouldn't we simply use it
by default? Also, do you plan to send updates in the DTS files?
As far as I can tell, Armada 370 is already using the equivalent of
this register I'd like to use in Armada XP. I'm not sure about the
other mvebu platforms. I couldn't just change the device tree for XP
to instantiate the 370 sensor, however, as they have different
initialization routines. Possibly Eziquiel can comment on the
significance of the differences between armadaxp_init_sensor() and
armada370_init_sensor().

I would like to change the default going forward, but I don't think it
can be changed on platforms using an older DTB.
Here you introduced a new kind of thermal sensor, at least from the point
of view of the device tree. You used a new compatible string associated to
a different register.

By using it by default do you mean removing marvell,armadaxp-thermal
and adding armadaxp-filtered-thermal instead ?

Does that new thermal sensors only improve the stability or does it
also modify the value?

In the second case it will more or less break the user space expectation.
I had planned to submit the dts change separately. It's not clear to
me how that's supposed to be handled if they might go through
different trees.
For this, there is no problem be handled in a different tree. At the end
we will need both the a new dts and a new driver to use it, so the fact that
the dts or the driver patch is merged in mainline first is not important.


Thanks,

Gregory

Thanks,
Tyler
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-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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