On 01/11, Tomasz Figa wrote:
> +
> +/**
> + * of_genpd_lock() - Lock access to of_genpd_providers list
> + */
> +static void of_genpd_lock(void)
> +{
> + mutex_lock(&of_genpd_mutex);
> +}
> +
> +/**
> + * of_genpd_unlock() - Unlock access to of_genpd_providers list
> + */
> +static void of_genpd_unlock(void)
> +{
> + mutex_unlock(&of_genpd_mutex);
> +}
Why do we need these functions? Can't we just call
mutex_lock/unlock directly?
> +
> +/**
> + * of_genpd_add_provider() - Register a domain provider for a node
> + * @np: Device node pointer associated with domain provider
> + * @genpd_src_get: callback for decoding domain
> + * @data: context pointer for @genpd_src_get callback.
These look a little outdated.
> + */
> +int of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
> + void *data)
> +{
> + struct of_genpd_provider *cp;
> +
> + cp = kzalloc(sizeof(struct of_genpd_provider), GFP_KERNEL);
Please use sizeof(*cp) instead.
> + if (!cp)
> + return -ENOMEM;
> +
> + cp->node = of_node_get(np);
> + cp->data = data;
> + cp->xlate = xlate;
> +
> + of_genpd_lock();
> + list_add(&cp->link, &of_genpd_providers);
> + of_genpd_unlock();
> + pr_debug("Added domain provider from %s\n", np->full_name);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(of_genpd_add_provider);
> +
[...]
> +
> +/* See of_genpd_get_from_provider(). */
> +static struct generic_pm_domain *__of_genpd_get_from_provider(
> + struct of_phandle_args *genpdspec)
> +{
> + struct of_genpd_provider *provider;
> + struct generic_pm_domain *genpd = ERR_PTR(-ENOENT);
Can this be -EPROBE_DEFER so that we can defer probe until a
later time if the power domain provider hasn't registered yet?
> +
> + /* Check if we have such a provider in our array */
> + list_for_each_entry(provider, &of_genpd_providers, link) {
> + if (provider->node == genpdspec->np)
> + genpd = provider->xlate(genpdspec, provider->data);
> + if (!IS_ERR(genpd))
> + break;
> + }
> +
> + return genpd;
> +}
> +
[...]
> +static int of_genpd_notifier_call(struct notifier_block *nb,
> + unsigned long event, void *data)
> +{
> + struct device *dev = data;
> + int ret;
> +
> + if (!dev->of_node)
> + return NOTIFY_DONE;
> +
> + switch (event) {
> + case BUS_NOTIFY_BIND_DRIVER:
> + ret = of_genpd_add_to_domain(dev);
> + break;
> +
> + case BUS_NOTIFY_UNBOUND_DRIVER:
> + ret = of_genpd_del_from_domain(dev);
> + break;
> +
> + default:
> + return NOTIFY_DONE;
> + }
> +
> + return notifier_from_errno(ret);
> +}
> +
> +static struct notifier_block of_genpd_notifier_block = {
> + .notifier_call = of_genpd_notifier_call,
> +};
> +
> +static int of_genpd_init(void)
> +{
> + return bus_register_notifier(&platform_bus_type,
> + &of_genpd_notifier_block);
> +}
> +core_initcall(of_genpd_init);
Would it be possible to call the of_genpd_add_to_domain() and
of_genpd_del_from_domain() functions directly in the driver core,
similar to how the pinctrl framework has a hook in there? That
way we're not relying on any initcall ordering for this.
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