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PM / Domains: Document flags for genpd

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The current documented description of the GENPD_FLAG_* flags, are too
simplified, so let's extend them.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ulf Hansson 2018-10-03 16:38:16 +02:00 committed by Rafael J. Wysocki
parent 2c9b7f8772
commit e5089c2c73
1 changed files with 30 additions and 5 deletions
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35
include/linux/pm_domain.h
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@ -17,11 +17,36 @@
#include <linux/notifier.h>
#include <linux/spinlock.h>
/* Defines used for the flags field in the struct generic_pm_domain */
#define GENPD_FLAG_PM_CLK (1U << 0) /* PM domain uses PM clk */
#define GENPD_FLAG_IRQ_SAFE (1U << 1) /* PM domain operates in atomic */
#define GENPD_FLAG_ALWAYS_ON (1U << 2) /* PM domain is always powered on */
#define GENPD_FLAG_ACTIVE_WAKEUP (1U << 3) /* Keep devices active if wakeup */
/*
* Flags to control the behaviour of a genpd.
*
* These flags may be set in the struct generic_pm_domain's flags field by a
* genpd backend driver. The flags must be set before it calls pm_genpd_init(),
* which initializes a genpd.
*
* GENPD_FLAG_PM_CLK: Instructs genpd to use the PM clk framework,
* while powering on/off attached devices.
*
* GENPD_FLAG_IRQ_SAFE: This informs genpd that its backend callbacks,
* ->power_on|off(), doesn't sleep. Hence, these
* can be invoked from within atomic context, which
* enables genpd to power on/off the PM domain,
* even when pm_runtime_is_irq_safe() returns true,
* for any of its attached devices. Note that, a
* genpd having this flag set, requires its
* masterdomains to also have it set.
*
* GENPD_FLAG_ALWAYS_ON: Instructs genpd to always keep the PM domain
* powered on.
*
* GENPD_FLAG_ACTIVE_WAKEUP: Instructs genpd to keep the PM domain powered
* on, in case any of its attached devices is used
* in the wakeup path to serve system wakeups.
*/
#define GENPD_FLAG_PM_CLK (1U << 0)
#define GENPD_FLAG_IRQ_SAFE (1U << 1)
#define GENPD_FLAG_ALWAYS_ON (1U << 2)
#define GENPD_FLAG_ACTIVE_WAKEUP (1U << 3)
enum gpd_status {
GPD_STATE_ACTIVE = 0, /* PM domain is active */