[PATCH] of: property: add i2c-parent to fw_devlink supplier bindings

Platform-device i2c muxes (i2c-mux-reg, i2c-mux-gpio, ...) reference
the bus they multiplex with an i2c-parent phandle and hold a reference
on that adapter from probe until remove. Unlike muxes that are clients
on the parent bus, they live outside the adapter's device hierarchy,
so nothing orders their teardown against it: if the adapter's device
is unbound first — e.g. while reverting a device-tree overlay whose
changeset attached the mux nodes before the controller nodes —
i2c_del_adapter() blocks forever in
wait_for_completion(&adap->dev_released), waiting for a reference that
is only dropped later in the same teardown sequence.

Teach fw_devlink about i2c-parent so the core creates the
corresponding device links: consumers are unbound before the parent
adapter's device, and probe ordering no longer needs -EPROBE_DEFER.

---
Signed-off-by: Abdurrahman Hussain <[email protected]>
---
 drivers/of/property.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/of/property.c b/drivers/of/property.c
index 72cf12907de0..c1e89629c842 100644
--- a/drivers/of/property.c
+++ b/drivers/of/property.c
@@ -1409,6 +1409,7 @@ DEFINE_SIMPLE_PROP(resets, "resets", "#reset-cells")
 DEFINE_SIMPLE_PROP(leds, "leds", NULL)
 DEFINE_SIMPLE_PROP(backlight, "backlight", NULL)
 DEFINE_SIMPLE_PROP(panel, "panel", NULL)
+DEFINE_SIMPLE_PROP(i2c_parent, "i2c-parent", NULL)
 DEFINE_SIMPLE_PROP(msi_parent, "msi-parent", "#msi-cells")
 DEFINE_SIMPLE_PROP(post_init_providers, "post-init-providers", NULL)
 DEFINE_SIMPLE_PROP(access_controllers, "access-controllers", "#access-controller-cells")
@@ -1562,6 +1563,7 @@ static const struct supplier_bindings of_supplier_bindings[] = {
 	{ .parse_prop = parse_resets, },
 	{ .parse_prop = parse_leds, },
 	{ .parse_prop = parse_backlight, },
+	{ .parse_prop = parse_i2c_parent, },
 	{ .parse_prop = parse_panel, },
 	{ .parse_prop = parse_msi_parent, },
 	{ .parse_prop = parse_pses, },

---
base-commit: d58772d8520c7ef247c4b95c9bd76d3a25da9ff5
change-id: 20260813-b4-of-property-add-i2c-parent-168c6d7f1934

Best regards,
--  
Abdurrahman Hussain <[email protected]>