linux-kernel - Re: [PATCH V3] cpuidle/powernv: Read target_residency value of idle states from DT if available

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Date:	Mon, 02 Feb 2015 17:39:24 +1100
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
Cc:	stewart@...ux.vnet.ibm.com, rafael.j.wysocki@...el.com,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: Re: [PATCH V3] cpuidle/powernv: Read target_residency value of idle
 states from DT if available

On Mon, 2015-02-02 at 10:40 +0530, Preeti U Murthy wrote:
> The device tree now exposes the residency values for different idle states. Read
> these values instead of calculating residency from the latency values. The values
> exposed in the DT are validated for optimal power efficiency. However to maintain
> compatibility with the older firmware code which does not expose residency
> values, use default values as a fallback mechanism. While at it, use better
> APIs to parse the powermgmt device tree node so as to avoid endianness
> transformation.
> 
> Signed-off-by: Preeti U Murthy <preeti@...ux.vnet.ibm.com>
> ---
> Changes from V2: https://lkml.org/lkml/2015/1/27/1054
> 1. Used APIs to eliminate endianness transformation

Hi Preeti,

I thought I was pretty clear when I said you should do that as a follow-up
patch.

This is now doing too many things, it's not a single logical change, and it's
touching code in arch/powerpc and the driver. Which means neither I nor Rafael
can easily merge it.  

So please go back to the v2 you had. And then do the of_property_count_u32_elems()
changes as separate patches.

cheers


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