From 0bf47f722fa9e4ecdab7497afc1af64330540bed Mon Sep 17 00:00:00 2001 From: Grzegorz Nitka Date: Sun, 7 Jun 2026 20:30:40 +0200 Subject: dpll: extend pin notifier with notification source ID Extend the DPLL pin notification API to include a source identifier indicating where the notification originates. This allows notifier consumers to distinguish between notifications coming from an associated DPLL instance, a parent pin, or the pin itself. A new field, src_clock_id, is added to struct dpll_pin_notifier_info and is passed through all pin-related notification paths. Callers of dpll_pin_notify() are updated to provide a meaningful source identifier based on their context: - pin registration/unregistration uses the DPLL's clock_id, - pin-on-pin operations use the parent pin's clock_id, - pin changes use the pin's own clock_id. As introduced in the commit ("dpll: allow registering FW-identified pin with a different DPLL"), it is possible to share the same physical pin via firmware description (fwnode) with DPLL objects from different kernel modules. This means that a given pin can be registered multiple times. Driver such as ICE (E825 devices) rely on this mechanism when listening for the event where a shared-fwnode pin appears, while avoiding reacting to events triggered by their own registration logic. This change only extends the notification metadata and does not alter existing semantics for drivers that do not use the new field. Reviewed-by: Arkadiusz Kubalewski Reviewed-by: Aleksandr Loktionov Reviewed-by: Jiri Pirko Signed-off-by: Grzegorz Nitka Link: https://patch.msgid.link/20260607183045.1213735-9-grzegorz.nitka@intel.com Signed-off-by: Jakub Kicinski --- include/linux/dpll.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include') diff --git a/include/linux/dpll.h b/include/linux/dpll.h index 03a538167691..7a6f8796cda2 100644 --- a/include/linux/dpll.h +++ b/include/linux/dpll.h @@ -233,6 +233,7 @@ struct dpll_pin_notifier_info { u64 clock_id; const struct fwnode_handle *fwnode; const struct dpll_pin_properties *prop; + u64 src_clock_id; }; #if IS_ENABLED(CONFIG_DPLL) -- cgit v1.2.3