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mfd: mfd-core: Add mechanism for removal of a subset of children

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Currently, the only way to remove MFD children is with a call to
mfd_remove_devices, which will remove all the children. Under
some circumstances it is useful to remove only a subset of the
child devices. For example if some additional clean up is required
between removal of certain child devices.

To accomplish this a level field is added to mfd_cell, the normal
mfd_remove_devices is modified to not remove devices that are set
to a higher level and a corresponding mfd_remove_devices_late
function is added to remove those children.

See further discussion at:
https://lore.kernel.org/lkml/20200616075834.GF2608702@dell/

Suggested-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Charles Keepax 2020-07-23 11:54:58 +01:00 • committed by Lee Jones
parent 4ee1d9dc80
commit 114294d276
2 changed files with 20 additions and 1 deletions
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5
include/linux/mfd/core.h
View file

@ -46,6 +46,9 @@
#define MFD_CELL_NAME(_name) \
MFD_CELL_ALL(_name, NULL, NULL, 0, 0, NULL, 0, false, NULL)
#define MFD_DEP_LEVEL_NORMAL 0
#define MFD_DEP_LEVEL_HIGH 1
struct irq_domain;
struct property_entry;
@ -63,6 +66,7 @@ struct mfd_cell_acpi_match {
struct mfd_cell {
const char *name;
int id;
int level;
int (*enable)(struct platform_device *dev);
int (*disable)(struct platform_device *dev);
@ -150,6 +154,7 @@ static inline int mfd_add_hotplug_devices(struct device *parent,
}
extern void mfd_remove_devices(struct device *parent);
extern void mfd_remove_devices_late(struct device *parent);
extern int devm_mfd_add_devices(struct device *dev, int id,
const struct mfd_cell *cells, int n_devs,