Subject: [PATCH V3 11/16] PM / OPP: Add helpers for initializing CPU OPPs

From: [email-masked] (Stephen Boyd)
Date: Thu, 30 Jul 2015 23:07:11 -0700

On 07/29, Viresh Kumar wrote:
> With "operating-points-v2" its possible to tell which devices share
> OPPs. We already have infrastructure to decode that information.
> 
> This patch adds following APIs:
> - of_get_cpus_sharing_opps: Returns cpumask of CPUs sharing OPPs (only
>   valid with v2 bindings).
> - of_cpumask_init_opp_table: Initializes OPPs for all CPUs present in
>   cpumask.
> - of_cpumask_free_opp_table: Frees OPPs for all CPUs present in cpumask.
> 
> - set_cpus_sharing_opps: Sets which CPUs share OPPs (only valid with old
>   OPP bindings, as this information isn't present in DT).
> 
> Reviewed-by: Bartlomiej Zolnierkiewicz <[email-masked]>
> Signed-off-by: Viresh Kumar <[email-masked]>

Reviewed-by: Stephen Boyd <[email-masked]>

Some minor nitpicks below:

> +
> +/*
> + * Works only for OPP v2 bindings.
> + *
> + * cpumask should be already set to mask of cpu_dev->id.
> + * Returns -ENOENT if operating-points-v2 bindings aren't supported.
> + */
> +int of_get_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask)
> +{
> +	struct device_node *np, *tmp_np;
> +	struct device *tcpu_dev;
> +	int cpu, ret = 0;
> +
> +	/* Get OPP descriptor node */
> +	np = _of_get_opp_desc_node(cpu_dev);
> +	if (IS_ERR(np)) {
> +		dev_dbg(cpu_dev, "%s: Couldn't find opp node: %ld\n", __func__,
> +			PTR_ERR(np));
> +		return -ENOENT;
> +	}
> +
> +	/* OPPs are shared ? */
> +	if (!of_get_property(np, "opp-shared", NULL))

if (!of_property_read_bool(np, "opp-shared")) ?

> +		goto put_cpu_node;
> +
> +	for_each_possible_cpu(cpu) {
> +		if (cpu == cpu_dev->id)
> +			continue;
> +
> +		tcpu_dev = get_cpu_device(cpu);
> +		if (!tcpu_dev) {
> +			dev_err(cpu_dev, "%s: failed to get cpu%d device\n",
> +				__func__, cpu);
> +			ret = -ENODEV;
> +			goto put_cpu_node;
> +		}
> +
> +		/* Get OPP descriptor node */
> +		tmp_np = _of_get_opp_desc_node(tcpu_dev);
> +		if (IS_ERR(tmp_np)) {
> +			dev_info(tcpu_dev, "%s: Couldn't find opp node: %ld\n",

dev_err?

> +				 __func__, PTR_ERR(tmp_np));
> +			ret = -EINVAL;

Why aren't we returning the PTR_ERR value here?

> +			goto put_cpu_node;

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