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authorCharles Keepax <ckeepax@opensource.cirrus.com>2020-07-23 13:54:58 +0300
committerLee Jones <lee.jones@linaro.org>2020-08-13 09:50:50 +0300
commit114294d276279d6cda81f9c685452239ea89cdb8 (patch)
tree8367f548a7691137cdf5f079244b648019c6cdda /drivers
parent4ee1d9dc8073acd40f04e5fe3771a5dff978d077 (diff)
downloadlinux-114294d276279d6cda81f9c685452239ea89cdb8.tar.xz
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 <lee.jones@linaro.org> Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/mfd/mfd-core.c16
1 files changed, 15 insertions, 1 deletions
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);