From 114294d276279d6cda81f9c685452239ea89cdb8 Mon Sep 17 00:00:00 2001 From: Charles Keepax Date: Thu, 23 Jul 2020 11:54:58 +0100 Subject: mfd: mfd-core: Add mechanism for removal of a subset of children 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 Signed-off-by: Charles Keepax Signed-off-by: Lee Jones --- drivers/mfd/mfd-core.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) (limited to 'drivers/mfd') diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c index b201842f82ad..c3651f06684f 100644 --- a/drivers/mfd/mfd-core.c +++ b/drivers/mfd/mfd-core.c @@ -356,6 +356,7 @@ static int mfd_remove_devices_fn(struct device *dev, void *data) { struct platform_device *pdev; const struct mfd_cell *cell; + int *level = data; if (dev->type != &mfd_dev_type) return 0; @@ -363,6 +364,9 @@ static int mfd_remove_devices_fn(struct device *dev, void *data) pdev = to_platform_device(dev); cell = mfd_get_cell(pdev); + if (level && cell->level > *level) + return 0; + regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies, cell->num_parent_supplies); @@ -372,9 +376,19 @@ static int mfd_remove_devices_fn(struct device *dev, void *data) return 0; } +void mfd_remove_devices_late(struct device *parent) +{ + int level = MFD_DEP_LEVEL_HIGH; + + device_for_each_child_reverse(parent, &level, mfd_remove_devices_fn); +} +EXPORT_SYMBOL(mfd_remove_devices_late); + void mfd_remove_devices(struct device *parent) { - device_for_each_child_reverse(parent, NULL, mfd_remove_devices_fn); + int level = MFD_DEP_LEVEL_NORMAL; + + device_for_each_child_reverse(parent, &level, mfd_remove_devices_fn); } EXPORT_SYMBOL(mfd_remove_devices); -- cgit v1.2.3