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From: Intel-wired-lan <redacted> On Behalf
Of Ivan Vecera
Sent: Tuesday, February 3, 2026 6:40 PM
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Subject: [Intel-wired-lan] [PATCH net-next v5 3/9] dpll: Add notifier
chain for dpll events

From: Petr Oros <redacted>

Currently, the DPLL subsystem reports events (creation, deletion,
changes) to userspace via Netlink. However, there is no mechanism for
other kernel components to be notified of these events directly.

Add a raw notifier chain to the DPLL core protected by dpll_lock. This
allows other kernel subsystems or drivers to register callbacks and
receive notifications when DPLL devices or pins are created, deleted,
or modified.

Define the following:
- Registration helpers: {,un}register_dpll_notifier()
- Event types: DPLL_DEVICE_CREATED, DPLL_PIN_CREATED, etc.
- Context structures: dpll_{device,pin}_notifier_info  to pass
relevant
  data to the listeners.

The notification chain is invoked alongside the existing Netlink event
generation to ensure in-kernel listeners are kept in sync with the
subsystem state.

Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Co-developed-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: Petr Oros <redacted>
---
 drivers/dpll/dpll_core.c    | 57
+++++++++++++++++++++++++++++++++++++
 drivers/dpll/dpll_core.h    |  4 +++
 drivers/dpll/dpll_netlink.c |  6 ++++
 include/linux/dpll.h        | 29 +++++++++++++++++++
 4 files changed, 96 insertions(+)

diff --git a/drivers/dpll/dpll_core.c b/drivers/dpll/dpll_core.c index

f04ed7195cadd..b05fe2ba46d91 100644

--- a/drivers/dpll/dpll_core.c
+++ b/drivers/dpll/dpll_core.c

@@ -23,6 +23,8 @@ DEFINE_MUTEX(dpll_lock);

DEFINE_XARRAY_FLAGS(dpll_device_xa, XA_FLAGS_ALLOC);
DEFINE_XARRAY_FLAGS(dpll_pin_xa, XA_FLAGS_ALLOC);

+static RAW_NOTIFIER_HEAD(dpll_notifier_chain);
+