[PATCH v3 4/5] powernv:cpufreq: Export nominal frequency via sysfs.

[Viresh Kumar]

On Thu, Mar 20, 2014 at 5:40 PM, Gautham R. Shenoy
<ego at linux.vnet.ibm.com> wrote:
> From: "Gautham R. Shenoy" <ego at linux.vnet.ibm.com>
>
> Create a driver attribute named cpuinfo_nominal_freq which
> creates a sysfs read-only file named cpuinfo_nominal_freq. Export
> the frequency corresponding to the nominal_pstate through this
> interface.
>
> Nominal frequency is the highest non-turbo frequency for the
> platform.  This is generally used for setting governor policies from
> user space for optimal energy efficiency.
>
> Signed-off-by: Gautham R. Shenoy <ego at linux.vnet.ibm.com>
> ---
>  drivers/cpufreq/powernv-cpufreq.c | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
>
> diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
> index e7b0292..46bee8a 100644
> --- a/drivers/cpufreq/powernv-cpufreq.c
> +++ b/drivers/cpufreq/powernv-cpufreq.c
> @@ -142,8 +142,30 @@ static unsigned int pstate_id_to_freq(int pstate_id)
>         return powernv_freqs[i].frequency;
>  }
>
> +/**
> + * show_cpuinfo_nominal_freq - Show the nominal CPU frequency as indicated by
> + * the firmware
> + */
> +static ssize_t show_cpuinfo_nominal_freq(struct cpufreq_policy *policy,
> +                                       char *buf)
> +{
> +       int nominal_freq;
> +       nominal_freq = pstate_id_to_freq(powernv_pstate_info.pstate_nominal_id);
> +       return sprintf(buf, "%u\n", nominal_freq);

return sprintf(buf, "%u\n",
pstate_id_to_freq(powernv_pstate_info.pstate_nominal_id));

??

> +}
> +
> +

remove extra blank line.

> +struct freq_attr cpufreq_freq_attr_cpuinfo_nominal_freq = {
> +       .attr = { .name = "cpuinfo_nominal_freq",
> +                 .mode = 0444,
> +               },

Align {}

> +       .show = show_cpuinfo_nominal_freq,
> +};
> +
> +
>  static struct freq_attr *powernv_cpu_freq_attr[] = {
>         &cpufreq_freq_attr_scaling_available_freqs,
> +       &cpufreq_freq_attr_cpuinfo_nominal_freq,
>         NULL,
>  };