linux-kernel - Re: [PATCH v9 06/11] cpuidle: dt: Support hierarchical CPU idle states

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Date:   Wed, 10 Oct 2018 16:03:44 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-pm@...r.kernel.org, Tony Lindgren <tony@...mide.com>,
        Kevin Hilman <khilman@...nel.org>,
        Lina Iyer <ilina@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lina Iyer <lina.iyer@...aro.org>,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH v9 06/11] cpuidle: dt: Support hierarchical CPU idle
 states

On Wed, Oct 03, 2018 at 04:38:19PM +0200, Ulf Hansson wrote:
> From: Lina Iyer <lina.iyer@...aro.org>
> 
> Currently CPU's idle states are represented in a flattened model, via the
> "cpu-idle-states" binding from within the CPU's device nodes.
> 
> Support the hierarchical layout during parsing and validating of the CPU's
> idle states. This is simply done by calling the new OF helper,
> of_get_cpu_state_node().
> 
> Cc: Lina Iyer <ilina@...eaurora.org>
> Suggested-by: Sudeep Holla <sudeep.holla@....com>
> Signed-off-by: Lina Iyer <lina.iyer@...aro.org>
> Co-developed-by: Ulf Hansson <ulf.hansson@...aro.org>
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
> ---
>  drivers/cpuidle/dt_idle_states.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/cpuidle/dt_idle_states.c b/drivers/cpuidle/dt_idle_states.c
> index 53342b7f1010..13f9b7cd32d1 100644
> --- a/drivers/cpuidle/dt_idle_states.c
> +++ b/drivers/cpuidle/dt_idle_states.c
> @@ -118,8 +118,7 @@ static bool idle_state_valid(struct device_node *state_node, unsigned int idx,
>  	for (cpu = cpumask_next(cpumask_first(cpumask), cpumask);
>  	     cpu < nr_cpu_ids; cpu = cpumask_next(cpu, cpumask)) {
>  		cpu_node = of_cpu_device_node_get(cpu);

We can get rid of above and the of_node_put below if we move this into
of_get_cpu_state_node as suggested in earlier patch.

Apart from these, I don't see any issues with the subset unless there
are users for these. I will dig the v8 and comment.

-- 
Regards,
Sudeep