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soc/tegra: pmc: Add comments clarifying wake events 

Add some comments to clarify the purpose of the wake event support
implemented in the PMC driver.

Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2019-06-04 17:41:15 +02:00
parent 03b3c21cb3
commit 34abf69732
1 changed files with 12 additions and 0 deletions
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12
drivers/soc/tegra/pmc.c
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@ -241,6 +241,11 @@ struct tegra_pmc_soc {
const char * const *reset_levels;
unsigned int num_reset_levels;
/*
* These describe events that can wake the system from sleep (i.e.
* LP0 or SC7). Wakeup from other sleep states (such as LP1 or LP2)
* are dealt with in the LIC.
*/
const struct tegra_wake_event *wake_events;
unsigned int num_wake_events;
};
@ -1906,6 +1911,11 @@ static int tegra_pmc_irq_alloc(struct irq_domain *domain, unsigned int virq,
}
}
/*
* For interrupts that don't have associated wake events, assign a
* dummy hardware IRQ number. This is used in the ->irq_set_type()
* and ->irq_set_wake() callbacks to return early for these IRQs.
*/
if (i == soc->num_wake_events)
err = irq_domain_set_hwirq_and_chip(domain, virq, ULONG_MAX,
&pmc->irq, pmc);
@ -1924,6 +1934,7 @@ static int tegra_pmc_irq_set_wake(struct irq_data *data, unsigned int on)
unsigned int offset, bit;
u32 value;
/* nothing to do if there's no associated wake event */
if (WARN_ON(data->hwirq == ULONG_MAX))
return 0;
@ -1954,6 +1965,7 @@ static int tegra_pmc_irq_set_type(struct irq_data *data, unsigned int type)
struct tegra_pmc *pmc = irq_data_get_irq_chip_data(data);
u32 value;
/* nothing to do if there's no associated wake event */
if (data->hwirq == ULONG_MAX)
return 0;