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mfd: Provide pm_runtime_no_callbacks flag in cell data

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Allow MFD cells to have pm_runtime_no_callbacks() called on them during
registration. This causes the runtime PM framework to ignore them,
allowing use of runtime PM to suspend the device as a whole even if
not all drivers for the MFD can usefully implement runtime PM. For
example, RTCs are likely to run continuously regardless of the power
state of the system.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Mark Brown 2010-11-26 17:19:34 +00:00 committed by Samuel Ortiz
parent d7b9f3220f
commit 4c90aa94f6
2 changed files with 10 additions and 0 deletions
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4
drivers/mfd/mfd-core.c
View File

@ -15,6 +15,7 @@
#include <linux/platform_device.h>
#include <linux/acpi.h>
#include <linux/mfd/core.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
static int mfd_add_device(struct device *parent, int id,
@ -82,6 +83,9 @@ static int mfd_add_device(struct device *parent, int id,
if (ret)
goto fail_res;
if (cell->pm_runtime_no_callbacks)
pm_runtime_no_callbacks(&pdev->dev);
kfree(res);
return 0;

6
include/linux/mfd/core.h
View File

@ -47,6 +47,12 @@ struct mfd_cell {
/* don't check for resource conflicts */
bool ignore_resource_conflicts;
/*
* Disable runtime PM callbacks for this subdevice - see
* pm_runtime_no_callbacks().
*/
bool pm_runtime_no_callbacks;
};
extern int mfd_add_devices(struct device *parent, int id,