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PM / Domains: Split genpd_dev_pm_attach()

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To extend genpd to deal with allowing multiple PM domains per device, some
of the code in genpd_dev_pm_attach() can be re-used. Let's prepare for this
by moving some of the code into a sub-function.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ulf Hansson 2018-05-31 12:59:57 +02:00 committed by Rafael J. Wysocki
parent bcd931f298
commit 8cb1cbd644
1 changed files with 33 additions and 27 deletions
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60
drivers/base/power/domain.c
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@ -2221,38 +2221,15 @@ static void genpd_dev_pm_sync(struct device *dev)
genpd_queue_power_off_work(pd);
}
/**
* genpd_dev_pm_attach - Attach a device to its PM domain using DT.
* @dev: Device to attach.
*
* Parse device's OF node to find a PM domain specifier. If such is found,
* attaches the device to retrieved pm_domain ops.
*
* Returns 1 on successfully attached PM domain, 0 when the device don't need a
* PM domain or when multiple power-domains exists for it, else a negative error
* code. Note that if a power-domain exists for the device, but it cannot be
* found or turned on, then return -EPROBE_DEFER to ensure that the device is
* not probed and to re-try again later.
*/
int genpd_dev_pm_attach(struct device *dev)
static int __genpd_dev_pm_attach(struct device *dev, struct device_node *np,
unsigned int index)
{
struct of_phandle_args pd_args;
struct generic_pm_domain *pd;
int ret;
if (!dev->of_node)
return 0;
/*
* Devices with multiple PM domains must be attached separately, as we
* can only attach one PM domain per device.
*/
if (of_count_phandle_with_args(dev->of_node, "power-domains",
"#power-domain-cells") != 1)
return 0;
ret = of_parse_phandle_with_args(dev->of_node, "power-domains",
"#power-domain-cells", 0, &pd_args);
ret = of_parse_phandle_with_args(np, "power-domains",
"#power-domain-cells", index, &pd_args);
if (ret < 0)
return ret;
@ -2290,6 +2267,35 @@ int genpd_dev_pm_attach(struct device *dev)
return ret ? -EPROBE_DEFER : 1;
}
/**
* genpd_dev_pm_attach - Attach a device to its PM domain using DT.
* @dev: Device to attach.
*
* Parse device's OF node to find a PM domain specifier. If such is found,
* attaches the device to retrieved pm_domain ops.
*
* Returns 1 on successfully attached PM domain, 0 when the device don't need a
* PM domain or when multiple power-domains exists for it, else a negative error
* code. Note that if a power-domain exists for the device, but it cannot be
* found or turned on, then return -EPROBE_DEFER to ensure that the device is
* not probed and to re-try again later.
*/
int genpd_dev_pm_attach(struct device *dev)
{
if (!dev->of_node)
return 0;
/*
* Devices with multiple PM domains must be attached separately, as we
* can only attach one PM domain per device.
*/
if (of_count_phandle_with_args(dev->of_node, "power-domains",
"#power-domain-cells") != 1)
return 0;
return __genpd_dev_pm_attach(dev, dev->of_node, 0);
}
EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
static const struct of_device_id idle_state_match[] = {